tesseract
5.0.0-alpha-619-ge9db
degradeimage.h
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/**********************************************************************
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* File: degradeimage.h
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* Description: Function to degrade an image (usually of text) as if it
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* has been printed and then scanned.
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* Authors: Ray Smith
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* Created: Tue Nov 19 2013
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*
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* (C) Copyright 2013, 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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*
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**********************************************************************/
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#ifndef TESSERACT_TRAINING_DEGRADEIMAGE_H_
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#define TESSERACT_TRAINING_DEGRADEIMAGE_H_
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#include "allheaders.h"
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#include <
tesseract/genericvector.h
>
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#include <
tesseract/helpers.h
>
// For TRand.
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#include "
rect.h
"
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namespace
tesseract
{
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// Degrade the pix as if by a print/copy/scan cycle with exposure > 0
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// corresponding to darkening on the copier and <0 lighter and 0 not copied.
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// If rotation is not nullptr, the clockwise rotation in radians is saved there.
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// The input pix must be 8 bit grey. (Binary with values 0 and 255 is OK.)
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// The input image is destroyed and a different image returned.
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struct
Pix*
DegradeImage
(
struct
Pix* input,
int
exposure, TRand* randomizer,
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float
* rotation);
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// Creates and returns a Pix distorted by various means according to the bool
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// flags. If boxes is not nullptr, the boxes are resized/positioned according to
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// any spatial distortion and also by the integer reduction factor box_scale
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// so they will match what the network will output.
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// Returns nullptr on error. The returned Pix must be pixDestroyed.
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Pix*
PrepareDistortedPix
(
const
Pix* pix,
bool
perspective,
bool
invert,
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bool
white_noise,
bool
smooth_noise,
bool
blur,
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int
box_reduction, TRand* randomizer,
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GenericVector<TBOX>
* boxes);
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// Distorts anything that has a non-null pointer with the same pseudo-random
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// perspective distortion. Width and height only need to be set if there
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// is no pix. If there is a pix, then they will be taken from there.
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void
GeneratePerspectiveDistortion
(
int
width,
int
height, TRand* randomizer,
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Pix** pix,
GenericVector<TBOX>
* boxes);
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// Computes the coefficients of a randomized projective transformation.
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// The image transform requires backward transformation coefficient, and the
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// box transform the forward coefficients.
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// Returns the incolor arg to pixProjective.
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int
ProjectiveCoeffs
(
int
width,
int
height, TRand* randomizer,
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float
** im_coeffs,
float
** box_coeffs);
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}
// namespace tesseract
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#endif // TESSERACT_TRAINING_DEGRADEIMAGE_H_
rect.h
genericvector.h
tesseract::DegradeImage
Pix * DegradeImage(Pix *input, int exposure, TRand *randomizer, float *rotation)
Definition:
degradeimage.cpp:108
tesseract::PrepareDistortedPix
Pix * PrepareDistortedPix(const Pix *pix, bool perspective, bool invert, bool white_noise, bool smooth_noise, bool blur, int box_reduction, TRand *randomizer, GenericVector< TBOX > *boxes)
Definition:
degradeimage.cpp:196
helpers.h
tesseract
Definition:
baseapi.h:65
GenericVector< TBOX >
tesseract::GeneratePerspectiveDistortion
void GeneratePerspectiveDistortion(int width, int height, TRand *randomizer, Pix **pix, GenericVector< TBOX > *boxes)
Definition:
degradeimage.cpp:237
tesseract::ProjectiveCoeffs
int ProjectiveCoeffs(int width, int height, TRand *randomizer, float **im_coeffs, float **box_coeffs)
Definition:
degradeimage.cpp:283
src
training
degradeimage.h
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