mirror of
https://github.com/tesseract-ocr/tesseract.git
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320 lines
10 KiB
C++
320 lines
10 KiB
C++
// (C) Copyright 2017, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <memory>
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#include "colpartition.h"
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#include "colpartitiongrid.h"
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#include "tablerecog.h"
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#include "include_gunit.h"
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namespace tesseract {
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class TestableTableRecognizer : public tesseract::TableRecognizer {
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public:
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using TableRecognizer::FindLinesBoundingBox;
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using TableRecognizer::HasSignificantLines;
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using TableRecognizer::RecognizeLinedTable;
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using TableRecognizer::RecognizeTable;
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using TableRecognizer::RecognizeWhitespacedTable;
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};
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class TestableStructuredTable : public tesseract::StructuredTable {
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public:
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using StructuredTable::CountHorizontalIntersections;
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using StructuredTable::CountVerticalIntersections;
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using StructuredTable::FindLinedStructure;
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using StructuredTable::FindWhitespacedColumns;
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using StructuredTable::FindWhitespacedStructure;
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using StructuredTable::VerifyLinedTableCells;
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void InjectCellY(int y) {
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cell_y_.push_back(y);
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cell_y_.sort();
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}
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void InjectCellX(int x) {
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cell_x_.push_back(x);
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cell_x_.sort();
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}
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void ExpectCellX(int x_min, int second, int add, int almost_done, int x_max) {
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ASSERT_EQ(0, (almost_done - second) % add);
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EXPECT_EQ(3 + (almost_done - second) / add, cell_x_.size());
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EXPECT_EQ(x_min, cell_x_.get(0));
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EXPECT_EQ(x_max, cell_x_.get(cell_x_.size() - 1));
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for (int i = 1; i < cell_x_.size() - 1; ++i) {
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EXPECT_EQ(second + add * (i - 1), cell_x_.get(i));
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}
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}
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void ExpectSortedX() {
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EXPECT_GT(cell_x_.size(), 0);
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for (int i = 1; i < cell_x_.size(); ++i) {
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EXPECT_LT(cell_x_.get(i - 1), cell_x_.get(i));
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}
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}
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};
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class SharedTest : public testing::Test {
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protected:
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void SetUp() {
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std::locale::global(std::locale(""));
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ICOORD bleft(0, 0);
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ICOORD tright(1000, 1000);
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text_grid_.reset(new ColPartitionGrid(5, bleft, tright));
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line_grid_.reset(new ColPartitionGrid(5, bleft, tright));
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}
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void TearDown() {
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tesseract::ColPartition_IT memory(&allocated_parts_);
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for (memory.mark_cycle_pt(); !memory.cycled_list(); memory.forward()) {
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memory.data()->DeleteBoxes();
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}
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}
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void InsertPartitions() {
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for (int row = 0; row < 800; row += 20)
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for (int col = 0; col < 500; col += 25)
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InsertPartition(col + 1, row + 1, col + 24, row + 19);
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}
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void InsertPartition(int left, int bottom, int right, int top) {
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TBOX box(left, bottom, right, top);
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ColPartition *part = ColPartition::FakePartition(box, PT_FLOWING_TEXT, BRT_TEXT, BTFT_NONE);
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part->set_median_width(3);
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part->set_median_height(3);
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text_grid_->InsertBBox(true, true, part);
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tesseract::ColPartition_IT add_it(&allocated_parts_);
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add_it.add_after_stay_put(part);
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}
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void InsertLines() {
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line_box_.set_to_given_coords(100 - line_grid_->gridsize(), 10 - line_grid_->gridsize(),
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450 + line_grid_->gridsize(), 50 + line_grid_->gridsize());
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for (int i = 10; i <= 50; i += 10)
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InsertHorizontalLine(100, 450, i);
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for (int i = 100; i <= 450; i += 50)
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InsertVerticalLine(i, 10, 50);
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for (int i = 100; i <= 200; i += 20)
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InsertHorizontalLine(0, 100, i);
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}
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void InsertHorizontalLine(int left, int right, int y) {
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TBOX box(left, y - line_grid_->gridsize(), right, y + line_grid_->gridsize());
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ColPartition *part = ColPartition::FakePartition(box, PT_HORZ_LINE, BRT_HLINE, BTFT_NONE);
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line_grid_->InsertBBox(true, true, part);
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tesseract::ColPartition_IT add_it(&allocated_parts_);
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add_it.add_after_stay_put(part);
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}
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void InsertVerticalLine(int x, int bottom, int top) {
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TBOX box(x - line_grid_->gridsize(), bottom, x + line_grid_->gridsize(), top);
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ColPartition *part = ColPartition::FakePartition(box, PT_VERT_LINE, BRT_VLINE, BTFT_NONE);
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line_grid_->InsertBBox(true, true, part);
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tesseract::ColPartition_IT add_it(&allocated_parts_);
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add_it.add_after_stay_put(part);
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}
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void InsertCellsInLines() {
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for (int y = 10; y <= 50; y += 10)
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for (int x = 100; x <= 450; x += 50)
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InsertPartition(x + 1, y + 1, x + 49, y + 9);
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}
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TBOX line_box_;
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std::unique_ptr<ColPartitionGrid> text_grid_;
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std::unique_ptr<ColPartitionGrid> line_grid_;
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ColPartition_LIST allocated_parts_;
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};
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class TableRecognizerTest : public SharedTest {
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protected:
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void SetUp() {
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SharedTest::SetUp();
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recognizer_.reset(new TestableTableRecognizer());
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recognizer_->Init();
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recognizer_->set_text_grid(text_grid_.get());
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recognizer_->set_line_grid(line_grid_.get());
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}
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std::unique_ptr<TestableTableRecognizer> recognizer_;
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};
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class StructuredTableTest : public SharedTest {
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protected:
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void SetUp() {
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SharedTest::SetUp();
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table_.reset(new TestableStructuredTable());
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table_->Init();
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table_->set_text_grid(text_grid_.get());
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table_->set_line_grid(line_grid_.get());
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}
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std::unique_ptr<TestableStructuredTable> table_;
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};
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TEST_F(TableRecognizerTest, HasSignificantLinesBasicPass) {
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InsertLines();
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TBOX smaller_guess(120, 15, 370, 45);
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TBOX larger_guess(90, 5, 490, 70);
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EXPECT_TRUE(recognizer_->HasSignificantLines(line_box_));
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EXPECT_TRUE(recognizer_->HasSignificantLines(larger_guess));
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EXPECT_TRUE(recognizer_->HasSignificantLines(smaller_guess));
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}
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TEST_F(TableRecognizerTest, HasSignificantLinesBasicFail) {
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InsertLines();
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TBOX box(370, 35, 500, 45);
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EXPECT_FALSE(recognizer_->HasSignificantLines(box));
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}
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TEST_F(TableRecognizerTest, HasSignificantLinesHorizontalOnlyFails) {
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InsertLines();
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TBOX box(0, 100, 200, 200);
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EXPECT_FALSE(recognizer_->HasSignificantLines(box));
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}
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TEST_F(TableRecognizerTest, FindLinesBoundingBoxBasic) {
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InsertLines();
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TBOX box(0, 0, 200, 50);
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bool result = recognizer_->FindLinesBoundingBox(&box);
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EXPECT_TRUE(result);
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EXPECT_EQ(line_box_.left(), box.left());
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EXPECT_EQ(line_box_.right(), box.right());
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EXPECT_EQ(line_box_.bottom(), box.bottom());
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EXPECT_EQ(line_box_.top(), box.top());
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}
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TEST_F(TableRecognizerTest, RecognizeLinedTableBasic) {
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InsertLines();
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TBOX guess(120, 15, 370, 45);
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tesseract::StructuredTable table;
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table.set_text_grid(text_grid_.get());
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table.set_line_grid(line_grid_.get());
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EXPECT_TRUE(recognizer_->RecognizeLinedTable(guess, &table));
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EXPECT_EQ(line_box_.bottom(), table.bounding_box().bottom());
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EXPECT_EQ(line_box_.top(), table.bounding_box().top());
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EXPECT_EQ(line_box_.left(), table.bounding_box().left());
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EXPECT_EQ(line_box_.right(), table.bounding_box().right());
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EXPECT_EQ(line_box_.area(), table.bounding_box().area());
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EXPECT_EQ(7, table.column_count());
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EXPECT_EQ(4, table.row_count());
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EXPECT_EQ(28, table.cell_count());
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EXPECT_TRUE(table.is_lined());
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}
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TEST_F(TableRecognizerTest, RecognizeWhitespacedTableBasic) {
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InsertPartitions();
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TBOX guess(0, 0, 500, 800);
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tesseract::StructuredTable table;
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table.set_text_grid(text_grid_.get());
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table.set_line_grid(line_grid_.get());
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EXPECT_TRUE(recognizer_->RecognizeWhitespacedTable(guess, &table));
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EXPECT_EQ(1, table.bounding_box().bottom());
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EXPECT_EQ(799, table.bounding_box().top());
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EXPECT_EQ(1, table.bounding_box().left());
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EXPECT_EQ(499, table.bounding_box().right());
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EXPECT_EQ(798 * 498, table.bounding_box().area());
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EXPECT_EQ(500 / 25, table.column_count());
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EXPECT_EQ(800 / 20, table.row_count());
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EXPECT_EQ(500 * 800 / 20 / 25, table.cell_count());
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EXPECT_FALSE(table.is_lined());
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}
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TEST_F(StructuredTableTest, CountVerticalIntersectionsAll) {
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table_->set_bounding_box(TBOX(0, 0, 1000, 1000));
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InsertPartition(0, 0, 100, 10);
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InsertPartition(1, 12, 43, 21);
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EXPECT_EQ(2, table_->CountVerticalIntersections(4));
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EXPECT_EQ(2, table_->CountVerticalIntersections(20));
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EXPECT_EQ(2, table_->CountVerticalIntersections(40));
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EXPECT_EQ(1, table_->CountVerticalIntersections(50));
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EXPECT_EQ(1, table_->CountVerticalIntersections(60));
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EXPECT_EQ(1, table_->CountVerticalIntersections(80));
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EXPECT_EQ(1, table_->CountVerticalIntersections(95));
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EXPECT_EQ(0, table_->CountVerticalIntersections(104));
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EXPECT_EQ(0, table_->CountVerticalIntersections(150));
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}
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TEST_F(StructuredTableTest, CountHorizontalIntersectionsAll) {
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table_->set_bounding_box(TBOX(0, 0, 1000, 1000));
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InsertPartition(0, 3, 100, 10);
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InsertPartition(110, 5, 200, 16);
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EXPECT_EQ(0, table_->CountHorizontalIntersections(0));
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EXPECT_EQ(1, table_->CountHorizontalIntersections(4));
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EXPECT_EQ(2, table_->CountHorizontalIntersections(8));
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EXPECT_EQ(1, table_->CountHorizontalIntersections(12));
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EXPECT_EQ(0, table_->CountHorizontalIntersections(20));
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}
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TEST_F(StructuredTableTest, VerifyLinedTableBasicPass) {
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for (int y = 10; y <= 50; y += 10)
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table_->InjectCellY(y);
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for (int x = 100; x <= 450; x += 50)
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table_->InjectCellX(x);
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InsertLines();
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InsertCellsInLines();
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table_->set_bounding_box(line_box_);
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EXPECT_TRUE(table_->VerifyLinedTableCells());
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}
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TEST_F(StructuredTableTest, VerifyLinedTableHorizontalFail) {
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for (int y = 10; y <= 50; y += 10)
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table_->InjectCellY(y);
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for (int x = 100; x <= 450; x += 50)
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table_->InjectCellX(x);
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InsertLines();
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InsertCellsInLines();
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InsertPartition(101, 11, 299, 19);
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table_->set_bounding_box(line_box_);
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EXPECT_FALSE(table_->VerifyLinedTableCells());
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}
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TEST_F(StructuredTableTest, VerifyLinedTableVerticalFail) {
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for (int y = 10; y <= 50; y += 10)
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table_->InjectCellY(y);
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for (int x = 100; x <= 450; x += 50)
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table_->InjectCellX(x);
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InsertLines();
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InsertCellsInLines();
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InsertPartition(151, 21, 199, 39);
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table_->set_bounding_box(line_box_);
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EXPECT_FALSE(table_->VerifyLinedTableCells());
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}
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TEST_F(StructuredTableTest, FindWhitespacedColumnsBasic) {
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InsertPartitions();
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TBOX guess(0, 0, 500, 800);
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table_->set_bounding_box(guess);
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table_->FindWhitespacedColumns();
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table_->ExpectCellX(1, 25, 25, 475, 499);
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}
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TEST_F(StructuredTableTest, FindWhitespacedColumnsSorted) {
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InsertPartitions();
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TBOX guess(0, 0, 500, 800);
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table_->set_bounding_box(guess);
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table_->FindWhitespacedColumns();
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table_->ExpectSortedX();
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}
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// TODO(nbeato): check failure cases
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// TODO(nbeato): check Recognize processes correctly on trivial real examples.
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} // namespace tesseract
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