Apparatus for converting video signal

摘要

Apparatus for generating at least a selected area in a picture is disclosed herein. The picture and the selected area are displayed on a video display means, and the user can optionally adjust the position and size of the selected area. The apparatus including the following devices. A first converting device that is used to generate a digital signal and a pointer defining signal according to a computer video signal. The picture is transferred from the computer video signal, and the selected area is defined in the pointer defining signal. A first adapting device that is utilized to adapt the format of the computer video signal to suit a digital display format corresponding to the pointer defining signal. A storage device determines said display timing of all the pixels of the picture. A pointer generating device generates a plurality of edge of the selected area according to the pointer defining signal. The pointer generates device defines the color and brightness of all the pixels of the picture and the selected area, and the plurality of edge of the selected area can be moved dynamically according to the pointer defining signal. A second converting device converts the output signal of the pointer generating device to an analog form corresponding to the pointer defining signal. A second adapting device adapts the converted output signal of the pointer generating device to suit an analog display format, the signal processed by the video display device being of the analog display format.