| 摘要 |
<p>Image binarization methods and devices for converting a grayscale image into a black and white binary image are provided. The grayscale image is divided into sub-images dynamically created from pixel to pixel containing a given pixel as well as neighboring pixels. The color value of the pixels in the sub-imag e is averaged and the threshold between the given pixel and the average color val ue is determined. Therefore, at a certain color value, this given pixel is convert ed to white and at another color value the pixel is converted black. The foregoing is effectuated pixel by pixel in a dynamic fashion evaluating each pixel relative to its neighboring pixels in order to produce a binarized image. A small sub-image provides greater clarity whereas a large sub-image gives a better broad view. In an image having a border surrounding characters, a smaller sub-image is used for the characters and t he larger sub-image is used for the border thereby providing two binarized images. The border in the image obtained for the characters is removed to be combined with the ima ge obtained for a clear border.</p> |
