JPEG compression is the most widely used image compression method because of its higher compression ratio and ideal compression effect. It uses a special lossy compression algorithm and deletes colors of images that is not detected easily by human eye, thus images can be compressed in a small st...
01 JPEG标准概述 JPEG标准的发展历程 01 02 03 1986年 JPEG标准第一版发布，支持基本压缩算法。1992年 JPEG标准第二版发布，增加了对连续色调图像和灰度图像的支持。2000年 JPEG标准第三版发布，引入了无损压缩和渐进式传输的功能。JPEG标准的应用领域 数字摄影 01 JPEG广泛应用于数字相机拍摄的图像存储和分享。互联...
JPEG compression (image resolution 5328 × 4508, 24-bit, subsampling 4:2:0, quality 90, image compression ratio ~10:1) could be done within 0.65 ms which corresponds to performance ~117 GB/s. Assuming that real bandwidth of the PCIe-4.0 x16 interface is around 24 GB/s, this is almost...
Once uploaded, our tool will intelligently determine the ideal compression ratio for each image. You’ll see that ratio appear on its thumbnail in the queue. If you think an image should be more or less compressed than what our server determines, that’s OK — you can control it. Just ta...
陈益刚,邓家先,谢凯明.基于JPEG-LS压缩比控制的图像压缩加密算法[J].计算机应用,2015,35(1):93-98. CHEN Yigang,DENGJiaxian,XIE Kaiming.ImageCompressionEncryption Algorithm BasedonCompressionRatio ControlofJPEG-LS[J].JournalofComputerApplications,2015,35(1):93-98.陈益刚;邓家先;谢凯明.基于JPEG-LS...
Test Images 测试图像编码比特率/bppCompress Ratio 压缩比PSNR 峰值信噪比/dB 由上表实验结果可得,在很大的压缩比下,仍然得到了比较高的峰值信噪比,并且重建图像的主观质量也很好。下面两张图片是Lena的原始图像和经过JPEG压缩后重建得到的图像。 Lena原始图像 ...
JPEG compression is the most widely used image compression method because of its higher compression ratio and ideal compression effect. It uses a special lossy compression algorithm and deletes colors of images that is not detected easily by human eye, thus images can be compressed in a small st...
Fig.5 Comparison of original image and reconstructed images under 20 times compression ratio with different wavelet transform levels 从图4、图5中可以看出,在影像压缩倍率为10倍时,1级小波变换后的重建影像较原始影像相比,视觉上的变化极小,3级和5级小...
Experimental results show that the JPEG image compression method based on DCT transform simple, convenient , can guarantee a higher compression ratio , but also ensures better image quality , the application of MATLAB simulation results come out better reflect the principles of the coding algorithm ....
jpeg压缩过程(JPEG compression process).doc,jpeg压缩过程(JPEG compression process) One.JPEG compression process The JPEG compression is implemented in four steps: 1. color mode conversion and sampling; 2.DCT transform; 3. quantization; 4. encoding. Tw