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The traditional orientation extraction algorithm based on pixels and the common used Gabor filter are both meliorated by compressing original fingerprint image to 1/4 size and getting the low-frequency image using Gauss filter for former, and by changing the rectangular template into 1-D linear template with two orthogonal beelines for latter. Experiments on FVC2004 databases and live-scan database...
Based on the sequential video frame, a method to detect the traffic sign was proposed. The color image was mapped from RGB to improved HSI color space first, and then converted it to binary image according the color of signs. The shape features were used to remove some noise, and the improved Hough transform was used to locate the areas of traffic signs. Compared to the existed detection algorithm,...
The singular points of a fingerprint image contain important information, so it is very significant to detect the position, number and type of singular points. The poincare index method can't accurately detect the singular points in arch fingerprints and some tented arch fingerprints. To resolve the problem, we propose an improvement of the poincare index method. The experimental results show that...
A new image method of velocity measurement based on the smearing effect is presented. The producing mechanism of the smearing effect is introduced, and the relationship between the trailing smear and the relative movement of the camera and the target is also studied. The kinetic model is built to describe the movement of the camera, target and the image. The pixel size and the scale of the camera,...
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