![]() ![]() When the image, on the average, is very light, some parts of the text may be irretrievably overlighted, with "torn" characters: Next, you can implement some algorithm for estimating the image brightness. Increase the scanning resolution to 400-600 dpi in this case: If they are scanned with the common 300 dpi resolution, the result may not be recognized well: If, on the other hand, the resolution is too great (greater than 600-700 dpi), loading and processing the image will take more time, while the recognition quality will not be materially improved.Īnother important tip concerns documents printed in very small font sizes (less than 10 pt). If the resolution is too small (lower than 150 dpi), some image details might be lost, and the recognition quality will deteriorate. When your application receives an image for recognition, one of the first steps can be checking the image resolution. If your application contains a scanning interface, you can also control the scanner settings. You can implement some basic quality-checking features, display tips for best image quality in the user interface and include advanced recommendations in the user's manual. To ensure that users of your application receive the best possible results, you need to pay some attention to the quality of input images. The best recognition results can only be achieved if the source image is of good quality. The guidelines below should help you get the best results for ocring files. ![]()
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