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According to the characteristics of the noise of discharging billet, method based on scale product using wavelet transform for denoising is introduced in this thesis. Then evaluation criteria based on edge detection which evaluates the quality of image denoising is proposed, according to the requirements of captured pictures in the thesis. With the position of slab changing in image, gray of edge...
In the paper, we use wavelet technique to detect edges in small scale along the direction of gradient maximum. Edges that we extracted are accurate and single-pixel wide. But the photo also contains a lot of noise, so we set threshold to extract the ideal edge points. Currently, the threshold is set mostly by people's experience that needing a lot of trial or set the average gray value of the image...
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