Gray-scale character image recognition based on fuzzy DCT transform features
Xuewen Wang, Xiaoqing Ding, Changsong Liu · 2002
We propose a method for recognizing gray-scale text images with noise and of extraordinary low resolution. First, a fuzzy classification of pixels in the gray-scale character images is applied to form the fuzzy attributed pixel graph using integral ratio techniques. Second, a DCT transform is applied on this fuzzy graph and parts of the frequency domain components are selected and compressed to produce the features for recognition. By using the modified quadratic discriminant function in the classifier, we achieve satisfactory recognition results with the average recognition rate of 96.82% on 15 pixel/spl times/15 pixel character images and at the speed of over 30 characters/s.