An improved license plate extraction technique based on gradient and prolonged Haar wavelet analysis
Proceedings of the International Conference and Workshop on Emerging Trends in Technology
Wavelet-based fingerprint region selection
CAIP'07 Proceedings of the 12th international conference on Computer analysis of images and patterns
Design and development of automatic visual inspection system for PCB manufacturing
Robotics and Computer-Integrated Manufacturing
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In this paper, a directional image for a fingerprint obtained from an expanded second stage Haar wavelet transform is presented. This directional image will represent the orientation pattern that later on will be used for fingerprint matching so that the real owner can be identified. To construct the directional image, we first perform a second stage Haar wavelet transform on a fingerprint. Due to the limitation of the Haar wavelet, we use the expanded version of it instead so that a better directional image can be obtained. Next, we quantize the directional image into a few grey-level values that represent a range of angle orientations. We then smooth the image using an averaging filter. Based on this image we then perform the matching process based on the minimum square error (MSE) criteria.