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dewarp3.c Applying and stripping the page disparity model Apply disparity array l_int32 dewarpaApplyDisparity() static l_int32 pixApplyVertDisparity() static l_int32 pixApplyHorizDisparity() Stripping out data and populating full res disparity l_int32 dewarpMinimize() l_int32 dewarpPopulateFullRes() Static functions not presently in use static FPIX *fpixSampledDisparity() static FPIX *fpixExtraHorizDisparity()
l_int32 dewarpMinimize ( L_DEWARP *dew )
dewarpMinimize() Input: dew Return: 0 if OK, 1 on error Notes: (1) This removes all data that is not needed for serialization. It keeps the subsampled disparity array(s), so the full resolution arrays can be reconstructed.
l_int32 dewarpPopulateFullRes ( L_DEWARP *dew, PIX *pix, l_int32 x, l_int32 y )
dewarpPopulateFullRes() Input: dew pix (<optional>, to give size of actual image) x, y (origin for generation of disparity arrays) Return: 0 if OK, 1 on error Notes: (1) If the full resolution vertical and horizontal disparity arrays do not exist, they are built from the subsampled ones. (2) If pixs is not given, the size of the arrays is determined by the original image from which the sampled version was generated. Any values of (x,y) are ignored. (3) If pixs is given, the full resolution disparity arrays must be large enough to accommodate it. (a) If the arrays do not exist, the value of (x,y) determines the origin of the full resolution arrays without extension, relative to pixs. Thus, (x,y) gives the amount of slope extension in (left, top). The (right, bottom) extension is then determined by the size of pixs and (x,y); the values should never be < 0. (b) If the arrays exist and pixs is too large, the existing full res arrays are destroyed and new ones are made, again using (x,y) to determine the extension in the four directions.
l_int32 dewarpaApplyDisparity ( L_DEWARPA *dewa, l_int32 pageno, PIX *pixs, l_int32 grayin, l_int32 x, l_int32 y, PIX **ppixd, const char *debugfile )
dewarpaApplyDisparity() Input: dewa pageno (of page model to be used; may be a ref model) pixs (image to be modified; can be 1, 8 or 32 bpp) grayin (gray value, from 0 to 255, for pixels brought in; use -1 to use pixels on the boundary of pixs) x, y (origin for generation of disparity arrays) &pixd (<return> disparity corrected image) debugfile (use null to skip writing this) Return: 0 if OK, 1 on error (no models or ref models available) Notes: (1) This applies the disparity arrays to the specified image. (2) Specify gray color for pixels brought in from the outside: 0 is black, 255 is white. Use -1 to select pixels from the boundary of the source image. (3) If the models and ref models have not been validated, this will do so by calling dewarpaInsertRefModels(). (4) This works with both stripped and full resolution page models. If the full res disparity array(s) are missing, they are remade. (5) The caller must handle errors that are returned because there are no valid models or ref models for the page -- typically by using the input pixs. (6) If there is no model for @pageno, this will use the model for 'refpage' and put the result in the dew for @pageno. (7) This populates the full resolution disparity arrays if necessary. If x and/or y are positive, they are used, in conjunction with pixs, to determine the required slope-based extension of the full resolution disparity arrays in each direction. When (x,y) == (0,0), all extension is to the right and down. Nonzero values of (x,y) are useful for dewarping when pixs is deliberately undercropped. (8) Important: when applying disparity to a number of images, after calling this function and saving the resulting pixd, you should call dewarpMinimize(dew) on the dew for @pageno. This will remove pixs and pixd (or their clones) stored in dew, as well as the full resolution disparity arrays. Together, these hold approximately 16 bytes for each pixel in pixs.
Zakariyya Mughal <email@example.com>
This software is copyright (c) 2014 by Zakariyya Mughal.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.