Based on the introduction of image identification,this paper puts forward the method of grid conversion and then establishes the relationship between the image coordinate and the plane coordinate.

Analysis and Check of Type Conversion and Control Flow Safety Vulnerability;

further more,explains that it s very possible to embody the spirit of traditional settlement for us im modern pattern of habitation by means of type conversion.

Because the de-quantized step is very important in the processing of frame type changing, a method which uses an activity of macroblock in the compressed domain to select quant scale was presented.