Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/intfx.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /******************************************************************************
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2 ** Filename: intfx.h
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3 ** Purpose: Interface to high level integer feature extractor.
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4 ** Author: Robert Moss
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5 ** History: Tue May 21 15:51:57 MDT 1991, RWM, Created.
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6 **
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7 ** (c) Copyright Hewlett-Packard Company, 1988.
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8 ** Licensed under the Apache License, Version 2.0 (the "License");
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9 ** you may not use this file except in compliance with the License.
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10 ** You may obtain a copy of the License at
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11 ** http://www.apache.org/licenses/LICENSE-2.0
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12 ** Unless required by applicable law or agreed to in writing, software
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13 ** distributed under the License is distributed on an "AS IS" BASIS,
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14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 ** See the License for the specific language governing permissions and
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16 ** limitations under the License.
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17 ******************************************************************************/
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18 #ifndef INTFX_H
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19 #define INTFX_H
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21 #include "blobs.h"
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22 #include "intproto.h"
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23 #include "normalis.h"
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25 #include <cmath>
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27 namespace tesseract {
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29 class DENORM;
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31 class TrainingSample;
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33 struct INT_FX_RESULT_STRUCT {
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34 int32_t Length; // total length of all outlines
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35 int16_t Xmean, Ymean; // center of mass of all outlines
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36 int16_t Rx, Ry; // radius of gyration
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37 int16_t NumBL, NumCN; // number of features extracted
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38 int16_t Width; // Width of blob in BLN coords.
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39 uint8_t YBottom; // Bottom of blob in BLN coords.
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40 uint8_t YTop; // Top of blob in BLN coords.
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41 };
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43 // The standard feature length
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44 const double kStandardFeatureLength = 64.0 / 5;
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46 /**----------------------------------------------------------------------------
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47 Public Function Prototypes
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48 ----------------------------------------------------------------------------**/
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49 TESS_API
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50 void InitIntegerFX();
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52 // Returns a vector representing the direction of a feature with the given
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53 // theta direction in an INT_FEATURE_STRUCT.
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54 TESS_API
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55 FCOORD FeatureDirection(uint8_t theta);
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57 // Generates a TrainingSample from a TBLOB. Extracts features and sets
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58 // the bounding box, so classifiers that operate on the image can work.
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59 // TODO(rays) BlobToTrainingSample must remain a global function until
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60 // the FlexFx and FeatureDescription code can be removed and LearnBlob
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61 // made a member of Classify.
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62 TrainingSample *BlobToTrainingSample(const TBLOB &blob, bool nonlinear_norm,
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63 INT_FX_RESULT_STRUCT *fx_info,
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64 std::vector<INT_FEATURE_STRUCT> *bl_features);
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66 } // namespace tesseract
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68 #endif