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The wavelet threshold denoising method has some defects. For example, the hard threshold function has no continuity at the threshold, which causes the Gibbs ringing effect. The soft threshold is relatively smooth, but the image is blurred. Image denoising based on total variation (TV) can effectively preserve the edge detail of the image, but in the smooth area, the denoising effect is not good. In...
A novel level set method based on on-line discriminative appearance modeling (DAMLSM) is presented for contour tracking. In contrast with traditional level set models which emphasize the intensity consistent segmentation and consider no priors, the proposed DAMLSM takes the context of tracking into account and use a discriminative patch based target model to guide the curve evolution. By modeling...
CT diagnosis has been widely used in medical tests. This article introduced the wavelet packet progressing on digital images first and then the Roberts, Prewitt, Sobel, LOG and Canny which belong to edge detection algorithms. Their merits and demerits are expounded by the edge detection algorithms of lung CT image on operators through MATLAB and comparison of both the difference between the detection...
The importance of phase in signal processing has been known for a long time. This paper presents an overview to the recent advances in phase properties of CWT coefficients. Our attention is mainly put on describing phase properties based on theoretical analyses and experimental results. The applications of the phase properties are briefly introduced. At last, we give an conclusion and an outlook.
A CCD control system based on dsPIC Digital Signal Controller(DSC) which integrates two ADC modules is designed. As a result, the DSC device simplifies the circuit arrangement, reduces the cost and improves the compatibility of the CCD control system. CCD Work timing and ADC work timing are emphasized. The experimental results show the simplification and practicality through application of this CCD...
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