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The Compression and Application of the Brain CT Image

Author: HuangPingAn
Tutor: WangJun
School: Nanjing University of Posts and Telecommunications
Course: Signal and Information Processing
Keywords: Sparse Decomposition Wavelet Transform Image Compression CT brain images
CLC: TP391.41
Type: Master's thesis
Year: 2012
Downloads: 18
Quote: 0
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Abstract


Nowadays , medical images for objectively reflect the patient's condition played a considerable role in the doctor understand the patient's condition by the medical images , compared with ordinary image , higher resolution requirements of medical images of the patient's condition , a doctor in order to make a diagnosis , medical image storage problems which students , higher resolution means more storage space , so its compression processing is essential . First, using improved genetic algorithm (Genetic Algorithm, GA) and matching pursuit (Matching Pursuit, MP) algorithm is a combination of sparse decomposition , brain CT image compression to save storage space . Calculated for the original genetic algorithm for a long time , the lack of matching low , improved methods to optimize the operation of choice , competition , and mutation of the number of iterations , and then use the algorithm to the brain CT image block compression , making computing speed , compression ratio and signal-to-noise ratio has been improved. Analysis and experimental verification , improved compression ratio , the distortion is smaller , shorter running time , and provide a new method for the study of brain CT image compression . Secondly, this paper introduces the concept of wavelet transform and multiresolution analysis knowledge Mallet algorithm wavelet transform , and applied to a two-dimensional image , combined EZW and SPIHT coding method for image compression . Also studied a new method combining wavelet transform and sparse decomposition on brain CT image compression by Matlab simulation of the sparse decomposition , wavelet transform as well as a combination of both contrast and concluded , the combination of both in the case of SNR allows greater compression ratios can be achieved .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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