Scan conversion
（重定向自Scan converter）
![A VGA to TV scan converter box like this turns enhanced-definition or high-definition signals into standard-definition signals.](/Images/godic/202502/09/Scan_converter_SW-22050_big0731.jpg")
Scan conversion or scan converting rate is a video processing technique for changing the vertical / horizontal scan frequency of video signal for different purposes and applications. The device which performs this conversion is called a scan converter.