Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/normfeat.cpp @ 27:28f7eb8e96ac

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Add FreeBSD to classifiers
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:08:19 +0200
parents b50eed0cc0ef
children
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1 /******************************************************************************
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2 ** Filename: normfeat.c
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3 ** Purpose: Definition of char normalization features.
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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7 ** Licensed under the Apache License, Version 2.0 (the "License");
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8 ** you may not use this file except in compliance with the License.
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9 ** You may obtain a copy of the License at
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10 ** http://www.apache.org/licenses/LICENSE-2.0
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11 ** Unless required by applicable law or agreed to in writing, software
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12 ** distributed under the License is distributed on an "AS IS" BASIS,
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13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 ** See the License for the specific language governing permissions and
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15 ** limitations under the License.
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16 ******************************************************************************/
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18 #include "normfeat.h"
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20 #include "featdefs.h"
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21 #include "intfx.h"
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22 #include "mfoutline.h"
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24 namespace tesseract {
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26 /** Return the length of the outline in baseline normalized form. */
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27 float ActualOutlineLength(FEATURE Feature) {
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28 return (Feature->Params[CharNormLength] * LENGTH_COMPRESSION);
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29 }
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31 /**
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32 * Return the character normalization feature for a blob.
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33 *
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34 * The features returned are in a scale where the x-height has been
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35 * normalized to live in the region y = [-0.25 .. 0.25]. Example ranges
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36 * for English below are based on the Linux font collection on 2009-12-04:
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37 *
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38 * - Params[CharNormY]
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39 * - The y coordinate of the grapheme's centroid.
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40 * - English: [-0.27, 0.71]
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41 *
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42 * - Params[CharNormLength]
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43 * - The length of the grapheme's outline (tiny segments discarded),
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44 * divided by 10.0=LENGTH_COMPRESSION.
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45 * - English: [0.16, 0.85]
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46 *
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47 * - Params[CharNormRx]
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48 * - The radius of gyration about the x axis, as measured from CharNormY.
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49 * - English: [0.011, 0.34]
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50 *
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51 * - Params[CharNormRy]
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52 * - The radius of gyration about the y axis, as measured from
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53 * the x center of the grapheme's bounding box.
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54 * - English: [0.011, 0.31]
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55 */
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56 FEATURE_SET ExtractCharNormFeatures(const INT_FX_RESULT_STRUCT &fx_info) {
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57 auto feature_set = new FEATURE_SET_STRUCT(1);
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58 auto feature = new FEATURE_STRUCT(&CharNormDesc);
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60 feature->Params[CharNormY] = MF_SCALE_FACTOR * (fx_info.Ymean - kBlnBaselineOffset);
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61 feature->Params[CharNormLength] = MF_SCALE_FACTOR * fx_info.Length / LENGTH_COMPRESSION;
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62 feature->Params[CharNormRx] = MF_SCALE_FACTOR * fx_info.Rx;
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63 feature->Params[CharNormRy] = MF_SCALE_FACTOR * fx_info.Ry;
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65 AddFeature(feature_set, feature);
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67 return feature_set;
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68 } /* ExtractCharNormFeatures */
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70 } // namespace tesseract