Tesseract: Error in boxClipToRectangle: box outside rectangle

[PedroBarcha]

Hi there, I've got some specific images that output the following on linux:

Tesseract Open Source OCR Engine v3.05.00dev with Leptonica
Error in boxClipToRectangle: box outside rectangle
Error in pixScanForForeground: invalid box

The pictures get successfully OCRed in tesseract (without great results tho). The biggest problem for me, however, is that in OCRopus they don't even get OCRed.

Any ideas?

[amitdo]

Error in boxClipToRectangle: box outside rectangle
Error in pixScanForForeground: invalid box

Add a white/black frame to the image and no error messages will appear.

convert  427-1.jpg  -bordercolor White -border 10x10 427-1b.jpg

Strange behaviour...

[amitdo]

The biggest problem for me, however, is that in OCRopus they don't even get OCRed.

This place is for bug reports about Tesseract, not OCRopus.

[erikdubbelboer]

@amitdo I'm getting the same issue just with Tesseract. I'm guessing OCRopus is using Tesseract and that's why he made the issue here.

[amitdo]

I'm guessing OCRopus is using Tesseract

Ocropy (and clstm) does not use Tesseract. A VERY OLD version of Ocropus (0.4) did use Tesseract.

[amitdo]

Similar issues #468 #1601

These error messages are produced by Leptonica.

They are triggered by a call to pixClipBoxToForeground()

https://github.com/DanBloomberg/leptonica/blob/bbe289cf3f0fe368d5b9eac64df2ccd6e9b05c56/src/pix5.c#L1956

https://github.com/tesseract-ocr/tesseract/search?q=pixClipBoxToForeground

[amitdo]

@stweil, this seems like a bug in Tesseract, maybe you can explore it and find its cause.

[amitdo]

https://github.com/tesseract-ocr/tesseract/search?q=pixClipBoxToForeground

I noticed that Tesseract does not check the return value from Leptonica's functions (l_ok).

[stweil]

@stweil, this seems like a bug in Tesseract, maybe you can explore it and find its cause.

It's caused by a box with width / height 0, but as always in Tesseract it is difficult to find the right fix.