mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-21 05:21:35 +08:00
731 lines
38 KiB
C++
731 lines
38 KiB
C++
// (C) Copyright 2017, Google Inc.
|
||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
// you may not use this file except in compliance with the License.
|
||
// You may obtain a copy of the License at
|
||
// http://www.apache.org/licenses/LICENSE-2.0
|
||
// Unless required by applicable law or agreed to in writing, software
|
||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
// See the License for the specific language governing permissions and
|
||
// limitations under the License.
|
||
|
||
#include <string> // for std::string
|
||
|
||
#include "include_gunit.h" // for TEST
|
||
#include "log.h" // for LOG
|
||
|
||
// ccmain
|
||
#include "paragraphs.h"
|
||
#include "paragraphs_internal.h"
|
||
// ccstruct
|
||
#include "ocrpara.h"
|
||
|
||
namespace tesseract {
|
||
|
||
// Functions for making monospace ASCII trial text for the paragraph detector.
|
||
const ParagraphJustification kLeft = JUSTIFICATION_LEFT;
|
||
const ParagraphJustification kCenter = JUSTIFICATION_CENTER;
|
||
const ParagraphJustification kRight = JUSTIFICATION_RIGHT;
|
||
const ParagraphJustification kUnknown = JUSTIFICATION_UNKNOWN;
|
||
|
||
enum TextModelInputType {
|
||
PCONT = 0, // Continuation line of a paragraph (default).
|
||
PSTART = 1, // First line of a paragraph.
|
||
PNONE = 2, // Not a paragraph line.
|
||
};
|
||
|
||
struct TextAndModel {
|
||
const char *ascii;
|
||
TextModelInputType model_type;
|
||
|
||
// fields corresponding to PARA (see ccstruct/ocrpara.h)
|
||
ParagraphModel model;
|
||
bool is_very_first_or_continuation;
|
||
bool is_list_item;
|
||
};
|
||
|
||
// Imagine that the given text is typewriter ASCII with each character ten
|
||
// pixels wide and twenty pixels high and return an appropriate row_info.
|
||
void AsciiToRowInfo(const char *text, int row_number, RowInfo *info) {
|
||
const int kCharWidth = 10;
|
||
const int kLineSpace = 30;
|
||
info->text = text;
|
||
info->has_leaders = strstr(text, "...") != nullptr || strstr(text, ". . .") != nullptr;
|
||
info->has_drop_cap = false;
|
||
info->pix_ldistance = info->pix_rdistance = 0;
|
||
info->average_interword_space = kCharWidth;
|
||
info->pix_xheight = kCharWidth;
|
||
info->lword_text = info->rword_text = "";
|
||
info->ltr = true;
|
||
|
||
std::vector<std::string> words = split(text, ' ');
|
||
info->num_words = words.size();
|
||
if (info->num_words < 1) {
|
||
return;
|
||
}
|
||
|
||
info->lword_text = words[0].c_str();
|
||
info->rword_text = words[words.size() - 1].c_str();
|
||
int lspace = 0;
|
||
while (lspace < info->text.size() && text[lspace] == ' ') {
|
||
lspace++;
|
||
}
|
||
int rspace = 0;
|
||
while (rspace < info->text.size() && text[info->text.size() - rspace - 1] == ' ') {
|
||
rspace++;
|
||
}
|
||
|
||
int top = -kLineSpace * row_number;
|
||
int bottom = top - kLineSpace;
|
||
int row_right = kCharWidth * info->text.size();
|
||
int lword_width = kCharWidth * info->lword_text.size();
|
||
int rword_width = kCharWidth * info->rword_text.size();
|
||
info->pix_ldistance = lspace * kCharWidth;
|
||
info->pix_rdistance = rspace * kCharWidth;
|
||
info->lword_box = TBOX(info->pix_ldistance, bottom, info->pix_ldistance + lword_width, top);
|
||
info->rword_box = TBOX(row_right - info->pix_rdistance - rword_width, bottom,
|
||
row_right - info->pix_rdistance, top);
|
||
LeftWordAttributes(nullptr, nullptr, info->lword_text, &info->lword_indicates_list_item,
|
||
&info->lword_likely_starts_idea, &info->lword_likely_ends_idea);
|
||
RightWordAttributes(nullptr, nullptr, info->rword_text, &info->rword_indicates_list_item,
|
||
&info->rword_likely_starts_idea, &info->rword_likely_ends_idea);
|
||
}
|
||
|
||
void MakeAsciiRowInfos(const TextAndModel *row_infos, int n, std::vector<RowInfo> *output) {
|
||
output->clear();
|
||
RowInfo info;
|
||
for (int i = 0; i < n; i++) {
|
||
AsciiToRowInfo(row_infos[i].ascii, i, &info);
|
||
output->push_back(info);
|
||
}
|
||
}
|
||
|
||
// Given n rows of reference ground truth, evaluate whether the n rows
|
||
// of PARA * pointers yield the same paragraph breakpoints.
|
||
void EvaluateParagraphDetection(const TextAndModel *correct, int n,
|
||
const std::vector<PARA *> &detector_output) {
|
||
int incorrect_breaks = 0;
|
||
int missed_breaks = 0;
|
||
int poorly_matched_models = 0;
|
||
int bad_crowns = 0;
|
||
int bad_list_items = 0;
|
||
ASSERT_EQ(detector_output.size(), n);
|
||
for (int i = 1; i < n; i++) {
|
||
bool has_break = correct[i].model_type != PCONT;
|
||
bool detected_break = (detector_output[i - 1] != detector_output[i]);
|
||
if (has_break && !detected_break) {
|
||
missed_breaks++;
|
||
}
|
||
if (detected_break && !has_break) {
|
||
incorrect_breaks++;
|
||
}
|
||
if (has_break) {
|
||
if (correct[i].model_type == PNONE) {
|
||
if (detector_output[i]->model != nullptr) {
|
||
poorly_matched_models++;
|
||
}
|
||
} else {
|
||
if (correct[i].model.justification() != kUnknown &&
|
||
(detector_output[i]->model == nullptr ||
|
||
!correct[i].model.Comparable(*detector_output[i]->model))) {
|
||
poorly_matched_models++;
|
||
}
|
||
}
|
||
if (correct[i].is_very_first_or_continuation ^
|
||
detector_output[i]->is_very_first_or_continuation) {
|
||
bad_crowns++;
|
||
}
|
||
if (correct[i].is_list_item ^ detector_output[i]->is_list_item) {
|
||
bad_list_items++;
|
||
}
|
||
}
|
||
}
|
||
EXPECT_EQ(incorrect_breaks, 0);
|
||
EXPECT_EQ(missed_breaks, 0);
|
||
EXPECT_EQ(poorly_matched_models, 0);
|
||
EXPECT_EQ(bad_list_items, 0);
|
||
EXPECT_EQ(bad_crowns, 0);
|
||
if (incorrect_breaks || missed_breaks || poorly_matched_models || bad_list_items || bad_crowns) {
|
||
std::vector<std::string> dbg_lines;
|
||
dbg_lines.emplace_back("# ==========================");
|
||
dbg_lines.emplace_back("# Correct paragraph breaks:");
|
||
dbg_lines.emplace_back("# ==========================");
|
||
for (int i = 0; i < n; i++) {
|
||
if (correct[i].model_type != PCONT) {
|
||
std::string s = std::string(correct[i].ascii) + " # " +
|
||
correct[i].model.ToString() +
|
||
(correct[i].is_very_first_or_continuation ? " crown" : "") +
|
||
(correct[i].is_list_item ? " li" : "");
|
||
dbg_lines.push_back(s);
|
||
} else {
|
||
dbg_lines.emplace_back(correct[i].ascii);
|
||
}
|
||
}
|
||
dbg_lines.emplace_back("");
|
||
dbg_lines.emplace_back("# ==========================");
|
||
dbg_lines.emplace_back("# Paragraph detector output:");
|
||
dbg_lines.emplace_back("# ==========================");
|
||
for (int i = 0; i < n; i++) {
|
||
std::string annotation;
|
||
if (i == 0 || (detector_output[i - 1] != detector_output[i])) {
|
||
if (detector_output[i] && detector_output[i]->model) {
|
||
annotation +=
|
||
" # " + detector_output[i]->model->ToString() +
|
||
(detector_output[i]->is_very_first_or_continuation ? " crown" : "") +
|
||
(detector_output[i]->is_list_item ? " li" : "");
|
||
} else {
|
||
annotation = " # Unmodeled paragraph.";
|
||
}
|
||
}
|
||
std::string s = correct[i].ascii + annotation;
|
||
dbg_lines.push_back(s);
|
||
}
|
||
std::string s;
|
||
for (auto &dbg_line : dbg_lines) {
|
||
s += dbg_line + "\n";
|
||
}
|
||
LOG(INFO) << "Discrepancy!\n" << s;
|
||
}
|
||
}
|
||
|
||
void TestParagraphDetection(const TextAndModel *correct, int num_rows) {
|
||
std::vector<RowInfo> row_infos;
|
||
std::vector<PARA *> row_owners;
|
||
PARA_LIST paragraphs;
|
||
std::vector<ParagraphModel *> models;
|
||
|
||
MakeAsciiRowInfos(correct, num_rows, &row_infos);
|
||
int debug_level(3);
|
||
tesseract::DetectParagraphs(debug_level, &row_infos, &row_owners, ¶graphs, &models);
|
||
EvaluateParagraphDetection(correct, num_rows, row_owners);
|
||
for (auto *model : models) {
|
||
delete model;
|
||
}
|
||
}
|
||
|
||
TEST(ParagraphsTest, ListItemsIdentified) {
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("iii"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("A."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("B."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("C."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("1."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("2."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("3."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("1"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("2"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("3"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("[[1]]"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("A-1."));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("A-2"));
|
||
EXPECT_TRUE(tesseract::AsciiLikelyListItem("(A)(i)"));
|
||
|
||
EXPECT_FALSE(tesseract::AsciiLikelyListItem("The"));
|
||
EXPECT_FALSE(tesseract::AsciiLikelyListItem("first"));
|
||
EXPECT_FALSE(tesseract::AsciiLikelyListItem("house"));
|
||
EXPECT_FALSE(tesseract::AsciiLikelyListItem("Oregonian."));
|
||
EXPECT_FALSE(tesseract::AsciiLikelyListItem("on."));
|
||
}
|
||
|
||
typedef ParagraphModel PModel;
|
||
|
||
const TextAndModel kTwoSimpleParagraphs[] = {
|
||
{" Look here, I have a paragraph.", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"This paragraph starts at the top", PCONT, PModel(), false, false},
|
||
{"of the page and takes 3 lines. ", PCONT, PModel(), false, false},
|
||
{" Here I have a second paragraph", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"which indicates that the first ", PCONT, PModel(), false, false},
|
||
{"paragraph is not a continuation ", PCONT, PModel(), false, false},
|
||
{"from a previous page, as it is ", PCONT, PModel(), false, false},
|
||
{"indented just like this second ", PCONT, PModel(), false, false},
|
||
{"paragraph. ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestSimpleParagraphDetection) {
|
||
TestParagraphDetection(kTwoSimpleParagraphs, countof(kTwoSimpleParagraphs));
|
||
}
|
||
|
||
const TextAndModel kFewCluesWithCrown[] = {
|
||
{"This paragraph starts at the top", PSTART, PModel(kLeft, 0, 20, 0, 0), true, false},
|
||
{"of the page and takes two lines.", PCONT, PModel(), false, false},
|
||
{" Here I have a second paragraph", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"which indicates that the first ", PCONT, PModel(), false, false},
|
||
{"paragraph is a continuation from", PCONT, PModel(), false, false},
|
||
{"a previous page, as it is ", PCONT, PModel(), false, false},
|
||
{"indented just like this second ", PCONT, PModel(), false, false},
|
||
{"paragraph. ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestFewCluesWithCrown) {
|
||
TestParagraphDetection(kFewCluesWithCrown, countof(kFewCluesWithCrown));
|
||
}
|
||
|
||
const TextAndModel kCrownedParagraph[] = {
|
||
{"The first paragraph on a page is", PSTART, PModel(kLeft, 0, 20, 0, 0), true, false},
|
||
{"often not indented as the rest ", PCONT, PModel(), false, false},
|
||
{"of the paragraphs are. Nonethe-", PCONT, PModel(), false, false},
|
||
{"less it should be counted as the", PCONT, PModel(), false, false},
|
||
{"same type of paragraph. ", PCONT, PModel(), false, false},
|
||
{" The second and third para- ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"graphs are both indented two ", PCONT, PModel(), false, false},
|
||
{"spaces. ", PCONT, PModel(), false, false},
|
||
{" The first paragraph has what ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"fmt refers to as a 'crown.' ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestCrownParagraphDetection) {
|
||
TestParagraphDetection(kCrownedParagraph, countof(kCrownedParagraph));
|
||
}
|
||
|
||
const TextAndModel kFlushLeftParagraphs[] = {
|
||
{"It is sometimes the case that", PSTART, PModel(kLeft, 0, 0, 0, 0), false, false},
|
||
{"flush left paragraphs (those", PCONT, PModel(), false, false},
|
||
{"with no body indent) are not", PCONT, PModel(), false, false},
|
||
{"actually crowns. ", PCONT, PModel(), false, false},
|
||
{"Instead, further paragraphs are", PSTART, PModel(kLeft, 0, 0, 0, 0), false, false},
|
||
{"also flush left aligned. Usual-", PCONT, PModel(), false, false},
|
||
{"ly, these paragraphs are set", PCONT, PModel(), false, false},
|
||
{"apart vertically by some white-", PCONT, PModel(), false, false},
|
||
{"space, but you can also detect", PCONT, PModel(), false, false},
|
||
{"them by observing the big empty", PCONT, PModel(), false, false},
|
||
{"space at the ends of the para-", PCONT, PModel(), false, false},
|
||
{"graphs. ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsText, TestRealFlushLeftParagraphs) {
|
||
TestParagraphDetection(kFlushLeftParagraphs, countof(kFlushLeftParagraphs));
|
||
}
|
||
|
||
const TextAndModel kSingleFullPageContinuation[] = {
|
||
{"sometimes a page is one giant", PSTART, PModel(kLeft, 0, 20, 0, 0), true, false},
|
||
{"continuation. It flows from", PCONT, PModel(), false, false},
|
||
{"line to line, using the full", PCONT, PModel(), false, false},
|
||
{"column width with no clear", PCONT, PModel(), false, false},
|
||
{"paragraph break, because it", PCONT, PModel(), false, false},
|
||
{"actually doesn't have one. It", PCONT, PModel(), false, false},
|
||
{"is the middle of one monster", PCONT, PModel(), false, false},
|
||
{"paragraph continued from the", PCONT, PModel(), false, false},
|
||
{"previous page and continuing", PCONT, PModel(), false, false},
|
||
{"onto the next page. There-", PCONT, PModel(), false, false},
|
||
{"fore, it ends up getting", PCONT, PModel(), false, false},
|
||
{"marked as a crown and then", PCONT, PModel(), false, false},
|
||
{"getting re-marked as any ex-", PCONT, PModel(), false, false},
|
||
{"isting model. Not great, but", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestSingleFullPageContinuation) {
|
||
const TextAndModel *correct = kSingleFullPageContinuation;
|
||
int num_rows = countof(kSingleFullPageContinuation);
|
||
std::vector<RowInfo> row_infos;
|
||
std::vector<PARA *> row_owners;
|
||
PARA_LIST paragraphs;
|
||
std::vector<ParagraphModel *> models;
|
||
models.push_back(new ParagraphModel(kLeft, 0, 20, 0, 10));
|
||
MakeAsciiRowInfos(correct, num_rows, &row_infos);
|
||
tesseract::DetectParagraphs(3, &row_infos, &row_owners, ¶graphs, &models);
|
||
EvaluateParagraphDetection(correct, num_rows, row_owners);
|
||
for (auto *model : models) {
|
||
delete model;
|
||
}
|
||
}
|
||
|
||
const TextAndModel kRightAligned[] = {
|
||
{"Right-aligned paragraphs are", PSTART, PModel(kRight, 0, 0, 0, 0), false, false},
|
||
{" uncommon in Left-to-Right", PCONT, PModel(), false, false},
|
||
{" languages, but they do", PCONT, PModel(), false, false},
|
||
{" exist.", PCONT, PModel(), false, false},
|
||
{" Mostly, however, they're", PSTART, PModel(kRight, 0, 0, 0, 0), false, false},
|
||
{" horribly tiny paragraphs in", PCONT, PModel(), false, false},
|
||
{" tables on which we have no", PCONT, PModel(), false, false},
|
||
{" chance anyways.", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestRightAlignedParagraph) {
|
||
TestParagraphDetection(kRightAligned, countof(kRightAligned));
|
||
}
|
||
|
||
const TextAndModel kTinyParagraphs[] = {
|
||
{" Occasionally, interspersed with", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"obvious paragraph text, you might", PCONT, PModel(), false, false},
|
||
{"find short exchanges of dialogue ", PCONT, PModel(), false, false},
|
||
{"between characters. ", PCONT, PModel(), false, false},
|
||
{" 'Oh?' ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{" 'Don't be confused!' ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{" 'Not me!' ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{" One naive approach would be to ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"mark a new paragraph whenever one", PCONT, PModel(), false, false},
|
||
{"of the statistics (left, right or", PCONT, PModel(), false, false},
|
||
{"center) changes from one text-", PCONT, PModel(), false, false},
|
||
{"line to the next. Such an", PCONT, PModel(), false, false},
|
||
{"approach would misclassify the", PCONT, PModel(), false, false},
|
||
{"tiny paragraphs above as a single", PCONT, PModel(), false, false},
|
||
{"paragraph. ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestTinyParagraphs) {
|
||
TestParagraphDetection(kTinyParagraphs, countof(kTinyParagraphs));
|
||
}
|
||
|
||
const TextAndModel kComplexPage1[] = {
|
||
{" Awesome ", PSTART, PModel(kCenter, 0, 0, 0, 0), false, false},
|
||
{" Centered Title ", PCONT, PModel(), false, false},
|
||
{" Paragraph Detection ", PCONT, PModel(), false, false},
|
||
{" OCR TEAM ", PCONT, PModel(), false, false},
|
||
{" 10 November 2010 ", PCONT, PModel(), false, false},
|
||
{" ", PNONE, PModel(), false, false},
|
||
{" Look here, I have a paragraph.", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"This paragraph starts at the top", PCONT, PModel(), false, false},
|
||
{"of the page and takes 3 lines. ", PCONT, PModel(), false, false},
|
||
{" Here I have a second paragraph", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"which indicates that the first ", PCONT, PModel(), false, false},
|
||
{"paragraph is not a continuation ", PCONT, PModel(), false, false},
|
||
{"from a previous page, as it is ", PCONT, PModel(), false, false},
|
||
{"indented just like this second ", PCONT, PModel(), false, false},
|
||
{"paragraph. ", PCONT, PModel(), false, false},
|
||
{" Here is a block quote. It ", PSTART, PModel(kLeft, 30, 0, 0, 0), true, false},
|
||
{" looks like the prior text ", PCONT, PModel(), false, false},
|
||
{" but it is indented more ", PCONT, PModel(), false, false},
|
||
{" and is fully justified. ", PCONT, PModel(), false, false},
|
||
{" So how does one deal with ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"centered text, block quotes, ", PCONT, PModel(), false, false},
|
||
{"normal paragraphs, and lists ", PCONT, PModel(), false, false},
|
||
{"like what follows? ", PCONT, PModel(), false, false},
|
||
{"1. Make a plan. ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{"2. Use a heuristic, for example,", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" looking for lines where the ", PCONT, PModel(), false, false},
|
||
{" first word of the next line ", PCONT, PModel(), false, false},
|
||
{" would fit on the previous ", PCONT, PModel(), false, false},
|
||
{" line. ", PCONT, PModel(), false, false},
|
||
{"8. Try to implement the plan in ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" Python and try it out. ", PCONT, PModel(), false, false},
|
||
{"4. Determine how to fix the ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" mistakes. ", PCONT, PModel(), false, false},
|
||
{"5. Repeat. ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" For extra painful penalty work", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"you can try to identify source ", PCONT, PModel(), false, false},
|
||
{"code. Ouch! ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestComplexPage1) {
|
||
TestParagraphDetection(kComplexPage1, countof(kComplexPage1));
|
||
}
|
||
|
||
// The same as above, but wider.
|
||
const TextAndModel kComplexPage2[] = {
|
||
{" Awesome ", PSTART, PModel(kCenter, 0, 0, 0, 0), false, false},
|
||
{" Centered Title ", PCONT, PModel(), false, false},
|
||
{" Paragraph Detection ", PCONT, PModel(), false, false},
|
||
{" OCR TEAM ", PCONT, PModel(), false, false},
|
||
{" 10 November 2010 ", PCONT, PModel(), false, false},
|
||
{" ", PNONE, PModel(), false, false},
|
||
{" Look here, I have a paragraph. ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"This paragraph starts at the top of", PCONT, PModel(), false, false},
|
||
{"the page and takes 3 lines. ", PCONT, PModel(), false, false},
|
||
{" Here I have a second paragraph ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"which indicates that the first ", PCONT, PModel(), false, false},
|
||
{"paragraph is not a continuation ", PCONT, PModel(), false, false},
|
||
{"from a previous page, as it is in- ", PCONT, PModel(), false, false},
|
||
{"dented just like this second para- ", PCONT, PModel(), false, false},
|
||
{"graph. ", PCONT, PModel(), false, false},
|
||
{" Here is a block quote. It ", PSTART, PModel(kLeft, 30, 0, 0, 0), true, false},
|
||
{" looks like the prior text ", PCONT, PModel(), false, false},
|
||
{" but it is indented more ", PCONT, PModel(), false, false},
|
||
{" and is fully justified. ", PCONT, PModel(), false, false},
|
||
{" So how does one deal with center-", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"ed text, block quotes, normal para-", PCONT, PModel(), false, false},
|
||
{"graphs, and lists like what follow?", PCONT, PModel(), false, false},
|
||
{"1. Make a plan. ", PCONT, PModel(), false, false}, // BUG!!
|
||
{"2. Use a heuristic, for example, ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" looking for lines where the ", PCONT, PModel(), false, false},
|
||
{" first word of the next line ", PCONT, PModel(), false, false},
|
||
{" would fit on the previous line. ", PCONT, PModel(), false, false},
|
||
{"8. Try to implement the plan in ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" Python and try it out. ", PCONT, PModel(), false, false},
|
||
{"4. Determine how to fix the ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" mistakes. ", PCONT, PModel(), false, false},
|
||
{"5. Repeat. ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, true},
|
||
{" For extra painful penalty work ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"you can try to identify source ", PCONT, PModel(), false, false},
|
||
{"code. Ouch! ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestComplexPage2) {
|
||
TestParagraphDetection(kComplexPage2, countof(kComplexPage2));
|
||
}
|
||
|
||
const TextAndModel kSubtleCrown[] = {
|
||
{"The first paragraph on a page is", PSTART, PModel(kLeft, 0, 20, 0, 0), true, false},
|
||
{"often not indented as the rest ", PCONT, PModel(), false, false},
|
||
{"of the paragraphs are. Nonethe-", PCONT, PModel(), false, false},
|
||
{"less it should be counted as the", PCONT, PModel(), false, false},
|
||
{"same type of paragraph. ", PCONT, PModel(), false, false},
|
||
{" Even a short second paragraph ", PSTART, PModel(kLeft, 0, 20, 0, 0), false, false},
|
||
{"should suffice. ", PCONT, PModel(), false, false},
|
||
{" 1235 ", PNONE, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestSubtleCrown) {
|
||
TestParagraphDetection(kSubtleCrown, countof(kSubtleCrown) - 1);
|
||
}
|
||
|
||
TEST(ParagraphsTest, TestStrayLineInBlock) {
|
||
TestParagraphDetection(kSubtleCrown, countof(kSubtleCrown));
|
||
}
|
||
|
||
const TextAndModel kUnlvRep3AO[] = {
|
||
{" Defined contribution plans cover employees in Australia, New", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"Zealand, Spain, the United Kingdom and some U.S. subsidiaries. ", PCONT, PModel(), false,
|
||
false},
|
||
{"In addition, employees in the U.S. are eligible to participate in ", PCONT, PModel(),
|
||
false, false},
|
||
{"defined contribution plans (Employee Savings Plans) by contribut-", PCONT, PModel(), false,
|
||
false},
|
||
{"ing a portion of their compensation. The Company matches com- ", PCONT, PModel(), false,
|
||
false},
|
||
{"pensation, depending on Company profit levels. Contributions ", PCONT, PModel(), false,
|
||
false},
|
||
{"charged to income for defined contribution plans were $92 in ", PCONT, PModel(), false,
|
||
false},
|
||
{"1993, $98 in 1992 and $89 in 1991. ", PCONT, PModel(), false,
|
||
false},
|
||
{" In addition to providing pension benefits, the Company pro- ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"vides certain health care and life insurance benefits to retired ", PCONT, PModel(), false,
|
||
false},
|
||
{"employees. As discussed in Note A, the Company adopted FASB ", PCONT, PModel(), false,
|
||
false},
|
||
{"Statement No. 106 effective January 1, 1992. Previously, the ", PCONT, PModel(), false,
|
||
false},
|
||
{"Company recognized the cost of providing these benefits as the ", PCONT, PModel(), false,
|
||
false},
|
||
{"benefits were paid. These pretax costs amounted to $53 in 1991. ", PCONT, PModel(), false,
|
||
false},
|
||
{"The Company continues to fund most of the cost of these medical ", PCONT, PModel(), false,
|
||
false},
|
||
{"and life insurance benefits in the year incurred. ", PCONT, PModel(), false,
|
||
false},
|
||
{" The U.S. plan covering the parent company is the largest plan.", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"It provides medical and life insurance benefits including hospital, ", PCONT, PModel(), false,
|
||
false},
|
||
{"physicians’ services and major medical expense benefits and life ", PCONT, PModel(), false,
|
||
false},
|
||
{"insurance benefits. The plan provides benefits supplemental to ", PCONT, PModel(), false,
|
||
false},
|
||
{"Medicare after retirees are eligible for these benefits. The cost of ", PCONT, PModel(),
|
||
false, false},
|
||
{"these benefits are shared by the Company and the retiree, with the ", PCONT, PModel(), false,
|
||
false},
|
||
{"Company portion increasing as the retiree has increased years of ", PCONT, PModel(), false,
|
||
false},
|
||
{"credited service. The Company has the ability to change these ", PCONT, PModel(), false,
|
||
false},
|
||
{"benefits at any time. ", PCONT, PModel(), false,
|
||
false},
|
||
{" Effective October 1993, the Company amended its health ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"benefits plan in the U.S. to cap the cost absorbed by the Company ", PCONT, PModel(), false,
|
||
false},
|
||
{"at approximately twice the 1993 cost per person for employees who", PCONT, PModel(), false,
|
||
false},
|
||
{"retire after December 31, 1993. The effect of this amendment was ", PCONT, PModel(), false,
|
||
false},
|
||
{"to reduce the December 31, 1993 accumulated postretirement ", PCONT, PModel(), false,
|
||
false},
|
||
{"benefit obligation by $327. It also reduced the net periodic postre- ", PCONT, PModel(), false,
|
||
false},
|
||
{"tirement cost by $21 for 1993 and is estimated to reduce this cost ", PCONT, PModel(), false,
|
||
false},
|
||
{"for 1994 by approximately $83. ", PCONT, PModel(), false,
|
||
false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestUnlvInsurance) {
|
||
TestParagraphDetection(kUnlvRep3AO, countof(kUnlvRep3AO));
|
||
}
|
||
|
||
// The basic outcome we want for something with a bunch of leader dots is that
|
||
// we group each logical entry as a separate item. Without knowledge of
|
||
// leaders, we would most likely mark the text below as a simple right aligned
|
||
// paragraph or two.
|
||
// This example comes from Volume 9886293, Page 5
|
||
const TextAndModel kTableOfContents[] = {
|
||
{"1 Hmong People ........... 1", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Hmong Origins . . . . . 1", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Language . . . . . . . 1", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Proverbs . . . . . . 2", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Discussion . . . . 2", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Riddles . . . . . . . 2", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Discussion . . . . 3", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Appearance . . . . . 3", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Hmong History . . . . . 4", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Hmong in SE Asia . . . 4", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Hmong in the West . . .5", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Hmong in the USA . . . 5", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
{" Discussion . . . . 6", PSTART, PModel(kUnknown, 0, 0, 0, 0), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, TestSplitsOutLeaderLines) {
|
||
TestParagraphDetection(kTableOfContents, countof(kTableOfContents));
|
||
}
|
||
|
||
const TextAndModel kTextWithSourceCode[] = {
|
||
{" A typical page of a programming book may contain", PSTART, PModel(kLeft, 0, 20, 0, 0),
|
||
false, false},
|
||
{"examples of source code to exemplify an algorithm ", PCONT, PModel(), false, false},
|
||
{"being described in prose. Such examples should be", PCONT, PModel(), false, false},
|
||
{"rendered as lineated text, meaning text with ", PCONT, PModel(), false, false},
|
||
{"explicit line breaks but without extra inter-line ", PCONT, PModel(), false, false},
|
||
{"spacing. Accidentally finding stray paragraphs in", PCONT, PModel(), false, false},
|
||
{"source code would lead to a bad reading experience", PCONT, PModel(), false, false},
|
||
{"when the text is re-flowed. ", PCONT, PModel(), false, false},
|
||
{" Let's show this by describing the function fact-", PSTART, PModel(kLeft, 0, 20, 0, 0),
|
||
false, false},
|
||
{"orial. Factorial is a simple recursive function ", PCONT, PModel(), false, false},
|
||
{"which grows very quickly. So quickly, in fact, ", PCONT, PModel(), false, false},
|
||
{"that the typical C implementation will only work ", PCONT, PModel(), false, false},
|
||
{"for values less than about 12: ", PCONT, PModel(), false, false},
|
||
{" ", PNONE, PModel(), false, false},
|
||
{" # Naive implementation in C ", PCONT, PModel(), false, false},
|
||
{" int factorial(int n) { ", PCONT, PModel(), false, false},
|
||
{" if (n < 2) ", PCONT, PModel(), false, false},
|
||
{" return 1; ", PCONT, PModel(), false, false},
|
||
{" return n * factorial(n - 1); ", PCONT, PModel(), false, false},
|
||
{" } ", PCONT, PModel(), false, false},
|
||
{" ", PCONT, PModel(), false, false},
|
||
{" The C programming language does not have built- ", PSTART, PModel(kLeft, 0, 20, 0, 0),
|
||
false, false},
|
||
{"in support for detecting integer overflow, so this", PCONT, PModel(), false, false},
|
||
{"naive implementation simply returns random values ", PCONT, PModel(), false, false},
|
||
{"if even a moderate sized n is provided. ", PCONT, PModel(), false, false},
|
||
};
|
||
|
||
TEST(ParagraphsTest, NotDistractedBySourceCode) {
|
||
TestParagraphDetection(kTextWithSourceCode, countof(kTextWithSourceCode));
|
||
}
|
||
|
||
const TextAndModel kOldManAndSea[] = {
|
||
{"royal palm which are called guano and in it there was a bed, a", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"table, one chair, and a place on the dirt floor to cook with charcoal.", PCONT, PModel(),
|
||
false, false},
|
||
{"On the brown walls of the flattened, overlapping leaves of the", PCONT, PModel(),
|
||
false, false},
|
||
{"sturdy fibered guano there was a picture in color of the Sacred", PCONT, PModel(),
|
||
false, false},
|
||
{"Heart of Jesus and another of the Virgin of Cobre. These were", PCONT, PModel(),
|
||
false, false},
|
||
{"relics of his wife. Once there had been a tinted photograph of his", PCONT, PModel(),
|
||
false, false},
|
||
{"wife on the wall but he had taken it down because it made him too", PCONT, PModel(),
|
||
false, false},
|
||
{"lonely to see it and it was on the shelf in the corner under his clean", PCONT, PModel(),
|
||
false, false},
|
||
{"shirt. ", PCONT, PModel(),
|
||
false, false},
|
||
{" \"What do you have to eat?\" the boy asked. ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"A pot of yellow rice with fish. Do you want some?\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"No. I will eat at home. Do you want me to make the fire?\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"No. I will make it later on. Or I may eat the rice cold.\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"May I take the cast net?\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"Of course.\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" There was no cast net and the boy remembered when they had", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"sold it. But they went through this fiction every day. There was no", PCONT, PModel(),
|
||
false, false},
|
||
{"pot of yellow rice and fish and the boy knew this too. "
|
||
" ",
|
||
PCONT, PModel(), false, false},
|
||
{" \"Eighty-five is a lucky number,\" the old man said. \"How", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"would you like to see me bring one in that dressed out over a "
|
||
"thou-",
|
||
PCONT, PModel(), false, false},
|
||
{"sand pounds? "
|
||
" ",
|
||
PCONT, PModel(), false, false},
|
||
{" \"I'll get the cast net and go for sardines. Will you sit in the "
|
||
"sun",
|
||
PSTART, PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"in the doorway?\" "
|
||
" ",
|
||
PCONT, PModel(), false, false},
|
||
{" \"Yes. I have yesterday's paper and I will read the baseball.\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" The boy did not know whether yesterday's paper was a fiction", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"too. But the old man brought it out from under the bed. ", PCONT, PModel(),
|
||
false, false},
|
||
{" \"Pedrico gave it to me at the bodega,\" he explained. "
|
||
" ",
|
||
PSTART, PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"I'll be back when I have the sardines. I'll keep yours and mine", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"together on ice and we can share them in the morning. When I", PCONT, PModel(),
|
||
false, false},
|
||
{"come back you can tell me about the baseball.\" ", PCONT, PModel(),
|
||
false, false},
|
||
{" \"The Yankees cannot lose.\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"But I fear the Indians of Cleveland.\" ", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{" \"Have faith in the Yankees my son. Think of the great Di-", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"Maggio.\" ", PCONT, PModel(),
|
||
false, false},
|
||
{" \"I fear both the Tigers of Detroit and the Indians of Cleve-", PSTART,
|
||
PModel(kLeft, 0, 50, 0, 0), false, false},
|
||
{"land.\" ", PCONT, PModel(),
|
||
false, false}};
|
||
|
||
TEST(ParagraphsTest, NotOverlyAggressiveWithBlockQuotes) {
|
||
TestParagraphDetection(kOldManAndSea, countof(kOldManAndSea));
|
||
}
|
||
|
||
const TextAndModel kNewZealandIndex[] = {
|
||
{"Oats, 51 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"O'Brien, Gregory, 175 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Occupational composition, 110,", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{" 138 ", PCONT, PModel(), false, false},
|
||
{"OECD rankings, 155, 172 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Okiato (original capital), 47 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Oil shock: 1974, xxx, 143; 1979,", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{" 145 ", PCONT, PModel(), false, false},
|
||
{"Old Age Pensions, xxii, 89-90 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Old World evils, 77 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Oliver, W. H., 39, 77, 89 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Olssen, Erik, 45, 64, 84 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Olympic Games, 1924, 111, 144 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Once on Chunuk Bair, 149 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Once Were Warriors, xxxiii, 170", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"On—shore whaling, xvi ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Opotiki, xix ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Orakau battle of, xviii, 57 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"O’Regan, Tipene, 170, 198-99 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Organic agriculture, 177 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Orwell, George, 151 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago, xvii, 45, 49-50, 70 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago block, xvii ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago Daily Times, 67 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago Girls’ High School, xix, 61,", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{" 85 ", PCONT, PModel(), false, false},
|
||
{"Otago gold rushes, 61-63 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago Peninsula, xx ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otago Provincial Council, 68 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Otaki, 33 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false},
|
||
{"Owls Do Cry, 139 ", PSTART, PModel(kLeft, 0, 0, 30, 0), false, false}};
|
||
|
||
TEST(ParagraphsTest, IndexPageTest) {
|
||
TestParagraphDetection(kNewZealandIndex, countof(kNewZealandIndex));
|
||
}
|
||
|
||
// TODO(eger): Add some right-to-left examples, and fix the algorithm as needed.
|
||
|
||
} // namespace tesseract
|