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Image Artificial Degradation

Author: ZhouChang
Tutor: LiaoXiaoFeng
School: Chongqing University
Course: Computer System Architecture
Keywords: Image degradation Image noise Select the encryption Chaos
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 39
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Abstract

Artificial image degradation, i.e. artificially initiative to reduce the visual quality of the image by a reversible manner. The main purpose is to achieve commercial image After the first purchase of the business model. That would let the user send the degradation of image processing to the trial, until the user decides to buy, and then restore the original image decryption key. So that you can share the spirit of the Internet and commercial profit purposes integration, to achieve a win-win situation. Mainly from the to choose encryption and image noise in both directions on the artificial image degradation discussed and analyzed. Mainly works as follows: 1. Introduced and analyzed manually select an encryption-based image degradation algorithms, including bit-plane select the encryption algorithm select the encryption algorithm and the DCT coefficients [1]. According to the results of the analysis pointed out, the bit plane choose to encrypt image degradation, it is best not encrypted first and second bits; choose to encrypt the DCT coefficients, it is recommended that the AC amplitude value of the run-length coding encryption, encryption run before the encoding of the AC coefficients. Proposed a new encryption algorithm degradation. Encrypted portion of the image pixels to the image degradation. Experiments show that the algorithm can not resist the attacks of the image filtering. To this end, the proposed block encryption scheme. Experiments show that improvements can effectively improve the resistance of the algorithm for image filtering algorithm. Proposed the idea of ??image noise to image degradation. And two modes of additive noise and multiplicative noise. Two modes quantitative analysis of the degree of degradation, the degree of degradation of the prediction formula and experimental validation. Degradation algorithm based on image noise security analysis and improvement. Image filtering attacks, the solution of the mixed noise. Image attack, select a template the binary adding noise. Finally, given the inadequacies of the paper. The main innovation of this paper is to propose the algorithm based on the noise image degradation. This algorithm is simple and fast, which will help utility. More importantly, the extent of degradation of the image analysis algorithm can be quantified under the conditions of the additive noise, degradation of the image compression rate of change can be estimated. These commercial applications is a very important condition. This shows that this algorithm will already have the basic conditions of business applications. Has some practical value.

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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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