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Recently, Dropbox wrote about dewarping prior to OCR in their app: https://news.ycombinator.com/item?id=12297944 https://news.ycombinator.com/item?id=12297944
by niftich 10y ago
Recently, Dropbox wrote about dewarping prior to OCR in their app: https://news.ycombinator.com/item?id=12297944 https://news.ycombinator.com/item?id=12297944
This code had the same idea, and is open-source!
- marcusjt 10y agoNo, what this code does is much more sophisticated - Dropbox do not dewarp (i.e. remove non-linear distortions) they only transform the image to make the document rectilinear (leaving the distortions/deformations intact), which is much simpler.
- vidarh 10y agoDewarping images for OCR isn't a new idea at all - while older systems used to do simple de-skew (tilting the image) for speed reasons, the need for warping the image to improve results has been known for a very long time, and most production quality OCR engines has done something like it for a long time. (this isn't to slight the article - it's a great, well written presentation on how to implement it)