In this paper we report the results of an adaptive block-size transform coding scheme that is bascd on the sequential JPEG algorithm. This minimum information-overhead method implies a transform coding technique with two différent block sizes: x and 2 x 2 pixels. The input image is divided into blocks of 2 x 2 pixels and each of these bocks is classified according to its image activity. Depending on this classification, either four N-point or a sngle 2-point 2-D DCT is applied on the block. The purpose of the algorithm is te take advantage of large uniform régions that can be coded as a single large unit instead of four small units — as it is made by a fixed block-size scheme. For the same reconstruction quality, the results of the adaptive algorithm show a significant improvement of the compression ratio with respect to the non-adaptive scheme.
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机译：在本文中，我们报告了基于顺序JPEG算法的自适应块大小变换编码方案的结果。这种最小的信息开销方法意味着具有两种不同块大小的变换编码技术：x和2 x 2像素。输入图像分为2 x 2像素的块，并且根据其图像活动将这些块中的每一个进行分类。根据此分类，在该块上应用四个N点或一个2点2-D DCT静态DCT。该算法的目的是利用大统一区域，该区域可以编码为单个大单元，而不是四个小单元，因为它是由固定的块大小方案制成的。对于相同的重建质量，自适应算法的结果显示出相对于非自适应方案，压缩率有了显着提高。
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