Description: 无链表SPIHT算法，速度比JPEG2000快，压缩比差不多-Listless SPIHT, JPEG2000 faster than the speed, compression ratio almost Platform: |
Size: 2048 |
Author:王晓东 |
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Description: 利用97小波变换进行图像压缩，用matlab仿真，实验证明它具有较高的压缩比-using wavelet transform image compression using Matlab simulation experiment to prove that it has a higher compression ratio Platform: |
Size: 48128 |
Author:李江涛 |
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Description: 自适应编码
本发明的目标是生成一种方法：对数组压缩和解压缩编码，特别是二进制数组；对数组整体的编码技术；展现了一个通过极限熵得到的特别的压缩比率。
-Adaptive Coding goal of the invention is to generate a Method : array compression coding, in particular binary array; a whole array of coding techniques; demonstrated a limit entropy through the special compression ratio. Platform: |
Size: 105472 |
Author:11111111 |
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Description: 余弦变换压缩，用于图像压缩，压缩比高，且压缩后图像质量仍然很好。适用于灰度图象。-Cosine Transform compression for image compression, compression ratio, and compressed image quality is still good. Apply to the gray-scale image. Platform: |
Size: 34816 |
Author:张弛 |
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Description: 输入：为需要压缩图象的名称,该主程序仅能构处理256灰度图,读者可以自行改编为RGB处理；ratio为压缩比率；level为小波分解的级数
输出:是解压完毕的图象数据矩阵-input : the need for image compression name, the main program can only handle 256 gray level structure, Readers can own adaptation of RGB; ratio of compression ratio; wavelet decomposition level for the series output : is finished unpacking the image data matrix Platform: |
Size: 54272 |
Author:林颖 |
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Description: 提出了一种基于 JPEG/JPEG2000相结合的医学图像感兴趣区域压缩方法。该方法对在人为选定
医学图像的感兴趣区域采用无损的 JPEG2000压缩 ,而对其他图像区域则采用高压缩比的 JPEG压缩,较好地解决了医学图像的高压缩比和高质量之间的矛盾。-Based on a combination of JPEG/JPEG2000 region of interest of medical image compression method. The method of artificially selected region of interest of medical images using lossless JPEG2000 compression, and on other image regions using high compression ratio of JPEG compression, a better solution to the medical image and high-quality high-compression ratio between the contradictions. Platform: |
Size: 283648 |
Author:胡敏 |
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Description: 利用小波提升算法和huffman编码进行图像的无算压缩，压缩比约50％，vc6编译-Using Wavelet Lifting Scheme and huffman coding image without operator compression, the compression ratio of about 50, vc6 compiler Platform: |
Size: 54272 |
Author:vic |
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Description: 改进的JPEG-LS算法，具有运算速度快、压缩比高等优点，可用于遥感图象的压缩。-Improved JPEG-LS algorithm, with a computing speed and high compression ratio can be used in remote sensing image compression. Platform: |
Size: 135168 |
Author:吴天 |
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Description: JPEG压缩方法由于其较高的压缩比和理想的压缩效果，是目前应用最广泛的图像压缩方法-JPEG compression method because of its higher compression ratio and ideal compression effect, is currently the most widely used method of image compression Platform: |
Size: 58368 |
Author:王为 |
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Description: matlab 分形压缩研究 分形压缩拥有很高的压缩比，用MATLAB实现时间较C要长 这里供参考-matlab fractal compression Fractal compression research has a high compression ratio, using MATLAB to achieve a longer time than C here for reference Platform: |
Size: 1024 |
Author:张罗 |
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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.
Platform: |
Size: 3072 |
Author:Ho Joon Lee |
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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.
Platform: |
Size: 95232 |
Author:Ho Joon Lee |
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Description: 基于小波变换的图像压缩代码，包括压缩比、运行时间和计算复原图像的峰值信噪比-Image compression based on wavelet transform code, including compression ratio, operation time and recovery images of the peak signal to noise ratio calculation Platform: |
Size: 413696 |
Author:刘灿 |
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Description: 基于contourlet的图像压缩编码，其中包括计算PSNR值，压缩比和运行时间-Contourlet-based image compression coding, including the calculation of PSNR values, compression ratio and run-time Platform: |
Size: 381952 |
Author:刘灿 |
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Description: fractal image compression of gray scale images....
only works for square images...
try with lena.bmp a gray scale one....
good compression ratio acheived Platform: |
Size: 4096 |
Author:Koushik |
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Description: Calculate the Mean Square Error (MSE) and the Peak Signal to Noise Ratio (PSNR) for different JPEG compression ratios. Platform: |
Size: 180224 |
Author:Ahmed |
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Description: matlab环境的小波压缩算法，给予dwt的心电图压缩，滤去了高频分量，具有较高的压缩比率-matlab environment wavelet compression algorithm, giving dwt ECG compression, filter the high frequency components with high compression ratio Platform: |
Size: 1024 |
Author:polochen |
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Search - compression ratio matlab