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Image Fusion based on（dct）Discrete Cosine transform

Image Fusion based on（DCT）Discrete Cosine Transform

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作者： Emadalden Mohammed Salem Al-hatami 合肥工业大学

学位级别：硕士

The development of remote sensing technology provides an effective technical means for human beings to define different environmental objects and utilize the involving data to extract the required *** are many types of remote sensing sensors,and different sensors have different characteristics for imaging the same scene,producing such as multispectral images,panchromatic Multi-source remote sensing images,infrared images,SAR images,*** image data acquired by various imaging sensors every day is massive,in order to process and use these data efficiently and comprehensively,multiple sources remote sensing images of the same scene need to be registered and ***-source Remote sensing image fusion uses specific techniques to remove redundant information from images from different sources for the same scene and combines Complementary information to generate a more precise,more accurate,and more comprehensive picture of the *** sensing image fusion is widely used in both military and civilian ***,this study investigated the possibility of enhancing image compression result based on dct process,where we transformed the image from RGB to YCb Cr,which has a great advantage over RGB,that Cr and Cb components can be depicted with a resolution less than Y because the human visual system is less sensitive to color than to luminance,thus,the subsampling of chrominance type 4: 2: 2 then 4: 2: 0 was applied whereas the image is cut into blocks of 8x8 pixels to apply the dct to highlight areas with high spatial *** to the lossy compression,we have been able to propose a quantization mask that eliminates the non-zero high energy values that appear in different parts of the block,to gain the maximum possible zeros adjacent after the zigzag scan.,to get a smaller size using ***,the DCs coefficients can then be a much smaller weight after the DPCM because they are often *** Huffman code eliminates the reappearance

关键词： Image fusion MS multispectral PAN panchromatic remote sensing image Quick Bird image dct transform

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A Strong Robust Watermarking Algorithm Based on Twice Arnold transform in dct Domain

A Strong Robust Watermarking Algorithm Based on Twice Arnold...

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教育部中南地区高等学校电子电气基础课教学研究会第二十届...

作者： Chen Wan-li~1,Yang Dong~2 (College of Information Engineering,Huanghe S&T College,China)

In this paper,a new kind of robust watermarking algorithm based on twice Arnold transform in dct domain of image is *** algorithm makes use of twice Arnold transform(AT),one applied to the carrier image and the other to the digital watermarking *** how many times twice AT process respectively can be obtained by offering to AT periods listed in *** first AT on carrier image is to enhance the texture and then the dct coefficients can be increased *** can efficiently improve the robustness of watermark *** the same time,this process also increases *** second one on watermarking image is to scramble it to improve *** dividing the carrier image into blocks and implementing dct transform to each block,the watermark is embedded into the appropriate frequency *** the watermarking image from the watermarked image is a reverse *** the secret key must be obtained *** results indicate that this algorithm can keep invisibility of the watermarking and can also strengthen the robustness of watermarking against generalimage attacks,such as noise’addition,filtering,JPEG compression and so *** addition,we use PSNR(Peak Signal Noise Ratio) to evaluate the invisibility and NC(Normalized Correlation) to evaluate the effect of watermarking extraction.

关键词： algorithm digital watermarking dct transform

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Research on Intra-Prediction Transcoding in transform Domain for AVS

Research on Intra-Prediction Transcoding in Transform Domain...

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2012 International Conference on Environmental Engineering and Technology(ICEET2012)

作者： Li-rong Feng,Qing-ming Yi,Min Shi College of Information Science and Technology,Jinan University,Guangzhou,China

For the differences of intra prediction between MPEG-2 and AVS standard,an intra prediction transcoding algorithm based on transform domain is introduced in this paper.A new transcoding structure in transform domain is proposed in the algorithm,dct prediction matrices of all AVS intra prediction modes are calculated with matrix operation,and the transformation matrix from dct domain to AVS integer transform domain is *** computation of intra prediction matrix transforming in transform domain is shown and *** results show that the proposed intra prediction transformation algorithm can reduce 50% calculation and meet the demand of real-time transcoding.

关键词： AVS intra prediction transform domain dct transform

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