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I’m using Tesseract OCR 3.01 in my iOS application, it shows 90% accuracy for my data when I pick an image from my phone’s library. But if I use the same image from the camera, it is showing jumbled letters. I followed this tutorial, kindly guide me if something can be done to make sure it works from camera as it works for gallery images.
Almost for sure the problem is “orientation”. Apple tends to create images in one bit map form – the image bits are laid out as if the camera was on its side with the volume buttons top and right. Images that you see which appear taller than wider are still laid out as above, but there is an “orientation” in the EXIF object included with the image.
I’m going to guess that tesseract does not look at the EXIF, but expects the image in a “standard” format so that text is in the position it would be for a person reading the text.
You can test my hypothesis by using camera images taken with volume button top right.
If they work, then what you will need to do is process the image yourself, and re-arrange the bits per the orientation setting. This is not all that hard to do but will require you to read up on vImage and/or bit map contexts.