It is suitable for both lossless and lossy compression. JBIG is an image compression standard for bi-level images, developed by the Joint Bi-level Image Experts Group. So the values are increased, increasing file size, but hopefully the distribution of values is more peaked. These factors have to be integers so that the result is an integer under all circumstances. JPEG2000 additionally uses data points from other pairs and multiplication factors to mix then into the difference. ![]() This is called discrete wavelet transform. ![]() For images this step can be repeated by taking the difference to the top pixel, and then in videos the difference to the pixel in the next frame can be taken.Ī hierarchical version of this technique takes neighboring pairs of data points, stores their difference and sum, and on a higher level with lower resolution continues with the sums. This is often also applied to sound files and can compress files which contain mostly low frequencies and low volumes. This leads to small values having a much higher probability than large values. Every pixel but the first is replaced by the difference to its left neighbor. Techniques that take advantage of the specific characteristics of images such as the common phenomenon of contiguous 2-D areas of similar tones.
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