Patent ID: 6052154
Filing Date: 2000-04-18
Classification: H04N

Abstract:
An image processing device for displaying a sub window of second video data on one part of a main screen by switching first video data for all of the main screen and the second video data for the sub window, said image processing device comprising:an analog-to-digital converter for digitizing the second video data to produce digitized second video data at a frequency f.sub.sub ;a data sampling circuit for sampling and compressing the digitized second video data at a subsampling frequency (1/n) (f.sub.sub), where n is a positive integer;a memory for reading out and storing the digitized second video data sampled and compressed by said data sampling circuit;a first switching circuit including a data expansion circuit for generating video data for the sub window by expanding the digitized second video data read out from said memory by m/n, where m is a positive integer not equal to n, said first switching circuit switching between expanding the digitized second video data read out from said memory in said data expansion circuit by (m/n) to generate 1/m.sup.2 sub window video data, and reading out the digitized second video data from said memory without expansion in said data expansion circuit to generate 1/n.sup.2 sub window video data;a digital-to-analog converter for converting image data expanded by said data expansion circuit to produce analog data; anda second switching circuit for switching video data for the sub window output from said digital-to-analog converter to insert the video data for the sub window into the first video data.