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In the use of wavelet transform is improve the quality of the signature image by image noise is filtered from the scanned documents. But the properties of the images, such as the number of strokes, the size and complexity of the stripes stripes still exist.AVR algorithm, which will make the image properties change, such as the complexity of the strokes will be reduced, because stripes size thicker. That is the reason why, the variance of the image is decreased when through AVR algorithm.
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