Quick Start 
1. Download K-Lite_Codec_Pack and install it. 
2. Create a .vas file  test.vas 
3. Copy the following lines into test.vas and save test.vas    
invideo = "C:\Users\Public\Videos\Sample Videos\Wildlife.avi";     //視頻文件
outvideo = stdout;                                                 // 處理后的視頻輸出到屏幕
oframe=(frame[1] - frame)*sobel;     // oFrame為輸出幀；Frame 表示當前幀；frame[1]是后一幀； sobel 是sobel因子; 此處的*表示濾波。

4. double click test.vas 
The edge of objects in the video will show up.