Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/degradeimage.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 /**********************************************************************
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2 * File: degradeimage.h
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3 * Description: Function to degrade an image (usually of text) as if it
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4 * has been printed and then scanned.
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5 * Authors: Ray Smith
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6 *
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7 * (C) Copyright 2013, Google Inc.
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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 **********************************************************************/
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19 #ifndef TESSERACT_TRAINING_DEGRADEIMAGE_H_
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20 #define TESSERACT_TRAINING_DEGRADEIMAGE_H_
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22 #include <allheaders.h>
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23 #include "helpers.h" // For TRand.
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24 #include "rect.h"
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26 namespace tesseract {
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28 // Degrade the pix as if by a print/copy/scan cycle with exposure > 0
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29 // corresponding to darkening on the copier and <0 lighter and 0 not copied.
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30 // If rotation is not nullptr, the clockwise rotation in radians is saved there.
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31 // The input pix must be 8 bit grey. (Binary with values 0 and 255 is OK.)
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32 // The input image is destroyed and a different image returned.
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33 Image DegradeImage(Image input, int exposure, TRand *randomizer, float *rotation);
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35 // Creates and returns a Pix distorted by various means according to the bool
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36 // flags. If boxes is not nullptr, the boxes are resized/positioned according to
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37 // any spatial distortion and also by the integer reduction factor box_scale
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38 // so they will match what the network will output.
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39 // Returns nullptr on error. The returned Pix must be pixDestroyed.
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40 Image PrepareDistortedPix(const Image pix, bool perspective, bool invert, bool white_noise,
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41 bool smooth_noise, bool blur, int box_reduction, TRand *randomizer,
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42 std::vector<TBOX> *boxes);
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43 // Distorts anything that has a non-null pointer with the same pseudo-random
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44 // perspective distortion. Width and height only need to be set if there
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45 // is no pix. If there is a pix, then they will be taken from there.
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46 void GeneratePerspectiveDistortion(int width, int height, TRand *randomizer, Image *pix,
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47 std::vector<TBOX> *boxes);
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48 // Computes the coefficients of a randomized projective transformation.
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49 // The image transform requires backward transformation coefficient, and the
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50 // box transform the forward coefficients.
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51 // Returns the incolor arg to pixProjective.
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52 int ProjectiveCoeffs(int width, int height, TRand *randomizer, float **im_coeffs,
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53 float **box_coeffs);
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55 } // namespace tesseract
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57 #endif // TESSERACT_TRAINING_DEGRADEIMAGE_H_