Single character recognition

[Vipul Aggarwal]

I am working on images with single character. 

However, tesseract is unable to recognize them.

This is how I initialized it:

        tess.Init(NULL, "eng", tesseract::OEM_DEFAULT);

tess.SetPageSegMode(tesseract::PSM_SINGLE_BLOCK_VERT_TEXT);

tess.SetVariable("tessedit_char_whitelist", "ABCDEFGHIJKLMNOPQRSTUVWXYZ");

This is what i do for recognition:

tess.SetImage((uchar*)rotatedImage.data, rotatedImage.cols, rotatedImage.rows, 1, rotatedImage.cols);

char* out = tess.GetUTF8Text();

I am attaching images

[Vipul Aggarwal]

Running tesseract through terminal leads to good result, but something might be wrong in my c++ implementation.

Please respond!

[Paul]

Maybe you could try to use the ResultIterator.

[Chris Dopuch]

Could you post the exact command line command you used to get good results for these images?

[zdenko podobny]

1. Why do you use PSM_SINGLE_BLOCK_VERT_TEXT for single character?
   
2. If I got it right - if you use command line you read image data from disk, when you use API you read image data from memory (cv?). Try to avoid using different sources (e.g. read image from disk in case of API to avoid mistakes in reading from memory...)

Zdenko

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[Vipul Aggarwal]

1. I use single char PSM only. It was experimentally changed. I forgot to change it back before posting.

2. Yes I was passing image with opencv earlier. I tried reading saving image and then reading it with leptonica and then passing it. Results got improved somehow.

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[Vipul Aggarwal]

Tesseract image.jpg -psm 10 out

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