聚類算法在圖像修復上的應用
[Abstract]:Image restoration is an important technology in the field of image processing. It mainly uses the existing information in the image to estimate the unknown region in the image, so that the restored image is close to the original image visually. Image restoration technology is widely used in real life. Image restoration based on sparse representation has become a new research direction. Based on the theory of sparse representation, this paper combines dictionary training and clustering method to further study image restoration technology. This paper first introduces the research background, significance and current situation of image restoration. The main research contents are: sparse representation theory, sparse representation algorithm and K-SVD dictionary learning algorithm; The advantages and disadvantages of current image restoration algorithms are analyzed. The image restoration algorithm based on sparse representation and dictionary learning is analyzed in detail. In order to ensure that the dictionary is rich in content and self-adaptive, the image of the image library is clustered before the dictionary is studied, so this paper also introduces the fuzzy clustering algorithm and its improved algorithm. Canopy algorithm is used to improve fuzzy clustering algorithm and its application on distributed platform. The simulation results show that the accuracy of Canopy-FCM algorithm is higher than that of FCM algorithm, and the distance between clusters is reduced. The RMS error and peak signal-to-noise ratio (PSNR) of the image restoration algorithm after clustering are calculated. The algorithm is better than the image restoration algorithm which only uses the image itself to be repaired for dictionary training. The algorithm makes good use of the similarity between the images, and has a good effect on the images with rich structural information. It also makes up for some shortcomings of image restoration algorithm based on K-SVD, and improves the quality of image restoration to some extent.
【學位授予單位】:西安理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TP391.41;TP311.13
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