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https://github.com/tesseract-ocr/tesseract.git
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255 lines
8.9 KiB
C++
255 lines
8.9 KiB
C++
/******************************************************************************
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** Filename: features.c
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** Purpose: Generic definition of a feature.
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** Author: Dan Johnson
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** History: Mon May 21 10:49:04 1990, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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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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******************************************************************************/
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/*----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------*/
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#include "ocrfeatures.h"
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#include "emalloc.h"
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#include "callcpp.h"
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#include "danerror.h"
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#include "freelist.h"
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#include "scanutils.h"
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#include <assert.h>
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#include <math.h>
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/*----------------------------------------------------------------------------
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Public Code
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----------------------------------------------------------------------------*/
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/**
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* Add a feature to a feature set. If the feature set is
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* already full, FALSE is returned to indicate that the
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* feature could not be added to the set; otherwise, TRUE is
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* returned.
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* @param FeatureSet set of features to add Feature to
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* @param Feature feature to be added to FeatureSet
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* @return TRUE if feature added to set, FALSE if set is already full.
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* @note History: Tue May 22 17:22:23 1990, DSJ, Created.
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*/
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BOOL8 AddFeature(FEATURE_SET FeatureSet, FEATURE Feature) {
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if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
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FreeFeature(Feature);
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return FALSE;
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}
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FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
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return TRUE;
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} /* AddFeature */
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/**
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* Release the memory consumed by the specified feature.
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* @param Feature feature to be deallocated.
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* @return none
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* @note History: Mon May 21 13:33:27 1990, DSJ, Created.
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*/
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void FreeFeature(FEATURE Feature) {
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if (Feature) {
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free_struct (Feature, sizeof (FEATURE_STRUCT)
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+ sizeof (FLOAT32) * (Feature->Type->NumParams - 1),
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"sizeof(FEATURE_STRUCT)+sizeof(FLOAT32)*(NumParamsIn(Feature)-1)");
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}
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} /* FreeFeature */
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/**
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* Release the memory consumed by the specified feature
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* set. This routine also frees the memory consumed by the
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* features contained in the set.
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* @param FeatureSet set of features to be freed
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* @return none
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* @note History: Mon May 21 13:59:46 1990, DSJ, Created.
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*/
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void FreeFeatureSet(FEATURE_SET FeatureSet) {
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int i;
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if (FeatureSet) {
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for (i = 0; i < FeatureSet->NumFeatures; i++)
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FreeFeature(FeatureSet->Features[i]);
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memfree(FeatureSet);
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}
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} /* FreeFeatureSet */
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/**
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* Allocate and return a new feature of the specified
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* type.
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* @param FeatureDesc description of feature to be created.
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* @return New #FEATURE.
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* @note History: Mon May 21 14:06:42 1990, DSJ, Created.
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*/
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FEATURE NewFeature(const FEATURE_DESC_STRUCT* FeatureDesc) {
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FEATURE Feature;
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Feature = (FEATURE) alloc_struct (sizeof (FEATURE_STRUCT) +
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(FeatureDesc->NumParams - 1) *
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sizeof (FLOAT32),
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"sizeof(FEATURE_STRUCT)+sizeof(FLOAT32)*(NumParamsIn(Feature)-1)");
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Feature->Type = FeatureDesc;
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return (Feature);
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} /* NewFeature */
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/**
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* Allocate and return a new feature set large enough to
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* hold the specified number of features.
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* @param NumFeatures maximum # of features to be put in feature set
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* @return New #FEATURE_SET.
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* @note History: Mon May 21 14:22:40 1990, DSJ, Created.
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*/
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FEATURE_SET NewFeatureSet(int NumFeatures) {
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FEATURE_SET FeatureSet;
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FeatureSet = (FEATURE_SET) Emalloc (sizeof (FEATURE_SET_STRUCT) +
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(NumFeatures - 1) * sizeof (FEATURE));
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FeatureSet->MaxNumFeatures = NumFeatures;
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FeatureSet->NumFeatures = 0;
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return (FeatureSet);
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} /* NewFeatureSet */
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/**
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* Create a new feature of the specified type and read in
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* the value of its parameters from File. The extra penalty
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* for the feature is also computed by calling the appropriate
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* function for the specified feature type. The correct text
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* representation for a feature is a list of N floats where
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* N is the number of parameters in the feature.
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* @param File open text file to read feature from
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* @param FeatureDesc specifies type of feature to read from File
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* @return New #FEATURE read from File.
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* @note Exceptions: #ILLEGAL_FEATURE_PARAM if text file doesn't match expected
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* format
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* @note History: Wed May 23 08:53:16 1990, DSJ, Created.
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*/
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FEATURE ReadFeature(FILE* File, const FEATURE_DESC_STRUCT* FeatureDesc) {
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FEATURE Feature;
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int i;
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Feature = NewFeature (FeatureDesc);
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for (i = 0; i < Feature->Type->NumParams; i++) {
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if (tfscanf(File, "%f", &(Feature->Params[i])) != 1)
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DoError (ILLEGAL_FEATURE_PARAM, "Illegal feature parameter spec");
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#ifndef _WIN32
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assert (!isnan(Feature->Params[i]));
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#endif
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}
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return (Feature);
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} /* ReadFeature */
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/**
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* Create a new feature set of the specified type and read in
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* the features from File. The correct text representation
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* for a feature set is an integer which specifies the number (N)
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* of features in a set followed by a list of N feature
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* descriptions.
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* @param File open text file to read new feature set from
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* @param FeatureDesc specifies type of feature to read from File
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* @return New feature set read from File.
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* @note History: Wed May 23 09:17:31 1990, DSJ, Created.
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*/
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FEATURE_SET ReadFeatureSet(FILE* File, const FEATURE_DESC_STRUCT* FeatureDesc) {
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FEATURE_SET FeatureSet;
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int NumFeatures;
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int i;
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if (tfscanf(File, "%d", &NumFeatures) != 1 || NumFeatures < 0)
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DoError(ILLEGAL_NUM_FEATURES, "Illegal number of features in set");
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FeatureSet = NewFeatureSet(NumFeatures);
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for (i = 0; i < NumFeatures; i++)
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AddFeature(FeatureSet, ReadFeature (File, FeatureDesc));
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return (FeatureSet);
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} /* ReadFeatureSet */
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/**
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* Appends a textual representation of Feature to str.
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* This representation is simply a list of the N parameters
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* of the feature, terminated with a newline. It is assumed
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* that the ExtraPenalty field can be reconstructed from the
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* parameters of the feature. It is also assumed that the
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* feature type information is specified or assumed elsewhere.
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* @param Feature feature to write out to str
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* @param str string to write Feature to
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* @return none
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* @note History: Wed May 23 09:28:18 1990, DSJ, Created.
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*/
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void WriteFeature(FEATURE Feature, STRING* str) {
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for (int i = 0; i < Feature->Type->NumParams; i++) {
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#ifndef WIN32
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assert(!isnan(Feature->Params[i]));
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#endif
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str->add_str_double(" ", Feature->Params[i]);
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}
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*str += "\n";
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} /* WriteFeature */
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/**
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* Write a textual representation of FeatureSet to File.
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* This representation is an integer specifying the number of
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* features in the set, followed by a newline, followed by
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* text representations for each feature in the set.
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* @param FeatureSet feature set to write to File
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* @param str string to write Feature to
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* @return none
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* @note History: Wed May 23 10:06:03 1990, DSJ, Created.
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*/
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void WriteFeatureSet(FEATURE_SET FeatureSet, STRING* str) {
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if (FeatureSet) {
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str->add_str_int("", FeatureSet->NumFeatures);
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*str += "\n";
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for (int i = 0; i < FeatureSet->NumFeatures; i++) {
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WriteFeature(FeatureSet->Features[i], str);
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}
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}
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} /* WriteFeatureSet */
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/**
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* Write a textual representation of FeatureDesc to File
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* in the old format (i.e. the format used by the clusterer).
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*
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* This format is:
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* @verbatim
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* Number of Params
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* Description of Param 1
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* ...
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* @endverbatim
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* @param File open text file to write FeatureDesc to
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* @param FeatureDesc feature descriptor to write to File
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* @return none
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* @note History: Fri May 25 15:27:18 1990, DSJ, Created.
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*/
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void WriteOldParamDesc(FILE* File, const FEATURE_DESC_STRUCT* FeatureDesc) {
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int i;
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fprintf (File, "%d\n", FeatureDesc->NumParams);
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for (i = 0; i < FeatureDesc->NumParams; i++) {
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if (FeatureDesc->ParamDesc[i].Circular)
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fprintf (File, "circular ");
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else
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fprintf (File, "linear ");
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if (FeatureDesc->ParamDesc[i].NonEssential)
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fprintf (File, "non-essential ");
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else
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fprintf (File, "essential ");
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fprintf (File, "%f %f\n",
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FeatureDesc->ParamDesc[i].Min, FeatureDesc->ParamDesc[i].Max);
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}
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} /* WriteOldParamDesc */
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