I have a image in want to read the letters,but those letters are not read it shows just one letter,plz tell how to read it using ocr
Instead of converting to grayscale, threshold on the green channel.
Those are very crude letters. It will probably take a pretty sophisticated OCR routine to recognize those. This MATLAB forum does not go into OCR much, except to refer you to the File Exchange or a web search. But you'll have trouble finding any OCR that can recognize those letters. You'd need substantial processing to turn them into something a lot more recognizable, and we just don't get into that kind of complicated algorithm development here. About all I could suggest is to use something like imclose() and bwmorph() to try to morph them into something that looks more like normal letters.