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2020-07-26Switch to integralimg 0.3.0 and use the new functions for integral sauvolaNick White
2020-07-23Update to v0.2.1 of integralimg, and improve various thingsNick White
- Improve integral sauvola by rounding threshold correctly - The Sauvola functions can now process any image.Image, not just an image.Gray - Add ImageWindower interface and use it to generalise wipesides.go - Rely on Bounds() for image bounds rather than implementation- specific stuff in integralimg Note that a couple of the wipesides tests are now failing. It's possible that this is due to fixed or introduced bugs (let's hope the former) changing sensible thresholds. Will need to look into this and sort it.
2020-07-23Improve sauvola by ensuring threshold is rounded correctly before comparisonNick White
2020-07-13Improve wiper algorithmNick White
Several changes made to wiper to improve things: - If findbestedge finds more than one 'best' line, choose the middle one, rather than the first. - findbestedge selects the line with the lowest number of black pixels, rather than (erroneously) the highest. - Added a findedgesOutin() function, which finds edges like findedges() but looking from the outside edges of the image inwards, rather than from the inside out. More testing is needed to decide whether this is useful; initial testing showed very little difference, but that was limited to lightly binarised images. This is in use by VWipe() at present, where worries about several gutters thanks to the edges of other pages aren't present. - Added separate vwsize, vthresh and vmin arguments to WipeFile so that vertical wiping can have different parameters (which is very important for good quality vertical wiping). - Updated wiping tests. - Rewrote the wipe cmd to use WipeFile() directly.
2020-03-05Add another top/bottom wipe testv0.1.1Nick White
2020-03-04Add vertical test to wipesidesNick White
2020-03-03Add edge detection tests for wipesidesNick White
These should be nice and robust to small changes that are still valid, as they don't depend on the output not changing, only on the detected sides being within appropriate limits.
2020-02-20Update wipesides testNick White
2019-10-08Continue separating the repository; remove all but preproc, and move ↵Nick White
integralimg package under it