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Description: dct algorithn包含zig-zag scan以及壓縮編碼等功能-dct algorithn contains zig-zag scan as well as features such as compression coding
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Size: 5120 |
Author: amy |
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Description: 用java实现二维dct变换及其idct逆变换，-The realization of two-dimensional transform and its inverse transform dct
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Size: 1024 |
Author: 蔡尧东 |
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Description: 原始影像離散餘弦轉換處理程式，含ForwardDCT與InverseDCT兩種方法。-Discrete cosine converting the original image processing program, including ForwardDCT with InverseDCT two ways.
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Size: 1024 |
Author: tzuhua |
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Description: This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious.
-This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious.
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Size: 95232 |
Author: Ho Joon Lee |
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Description: 一种频域加密算法，图像经过DCT变换得到DCT系数，然后对DCT系数进行加密。然后对加密的DCT系数进行DCT反变换图像数据。最后对其加密后的图像数据进行线性变换来调整图像数据的取值范围在[0，255]。最后得到加密图像-A frequency-domain encryption algorithm, the image obtained through the DCT transform DCT coefficients, and then encrypt the DCT coefficients. And then encrypted DCT coefficients DCT inverse transform image data. The last of its encrypted image data linear transformation to adjust the image data ranges in [0,255]. Finally the image is encrypted
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Size: 13312 |
Author: 林旭亮 |
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Description: 一种基于DCT的扩频水印算法，本算法通过对水印信息进行扩频，在原始载体图像的DCT域内进行水印嵌入。-DCT-based spread spectrum watermarking algorithm, the algorithm is spreading through the watermark information in the original carrier image of the DCT domain for watermark embedding.
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Size: 28672 |
Author: 林旭亮 |
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Description: 实现对图片数字水印的添加和缩放，并且包含数字和图片水印的添加。而且增加了缩放功能。-Implementation of digital watermarking to add the picture and zoom, and includes figures and images watermark to add. And increased the zoom feature.
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Size: 2048 |
Author: talentyao |
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Description: 用JAVA实现的离散余弦变换，离散余弦变换是各种压缩算法用到的-JAVA Implementation of Discrete Cosine Transform, Discrete Cosine Transform is used in a variety of compression algorithms
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Size: 5120 |
Author: 李林泽 |
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