Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about the coding principle of ZIGZAG scanning, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Next, let's talk about how to organize and handle these values during the coding process, which is ZigZag scanning.

I. brief introduction

ZigZag scanning is also known as zigzag scanning, which is so called because its scanning path is very similar to the zigzag character in Chinese characters. The work of ZigZag scanning is to change the quantized coefficient from two-dimensional to one-dimensional according to a certain path.

II. Gesture

3. Description:

(1) the left side of the figure above shows the scanning order of ZigZag, because after DCT transformation and quantization, the lower right corner of the matrix has basically become zero, and the non-zero value is basically concentrated in the upper left corner of the matrix. After ZigZag scanning, after turning the two-dimensional matrix into an one-dimensional string, the front is the non-zero value, and the back is more zero value.

(2) the order of such scans provides a particularly good premise for subsequent entropy coding.

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