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Avoid error in pixSauvolaBinarizeTiled (issue #4390) #4418

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Merged
stweil merged 1 commit into from
Apr 27, 2025
Merged

Avoid error in pixSauvolaBinarizeTiled (issue #4390) #4418

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5 changes: 4 additions & 1 deletion src/ccmain/thresholder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -207,7 +207,10 @@ std::tuple<bool, Image, Image, Image> ImageThresholder::Threshold(
tprintf("\nimage width: %d height: %d ppi: %d\n", pix_w, pix_h, yres_);
}

if (method == ThresholdMethod::Sauvola) {
if (method == ThresholdMethod::Sauvola && pix_w > 6 && pix_h > 6) {
// pixSauvolaBinarizeTiled requires half_window_size >= 2.
// Therefore window_size must be at least 4 which requires
// pix_w and pix_h to be at least 7.
int window_size;
double window_size_factor;
api->GetDoubleVariable("thresholding_window_size", &window_size_factor);
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