Image processing device with expander minimizing memory requirem

Details Image processing device with expander minimizing memory requirem Image processing device with expander minimizing memory requirem

1997-07-03

2000-04-18

Peng, John K.

Television

Basic receiver with additional function

For display of additional information

348565, 348568, H04N 544

Patent

active

060521546

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 the entire screen and the second video data for the sub window includes an analog-to-digital converter for digitizing the second video data and a data sampling circuit for sampling and compressing the digitized video data at a subsampling frequency. The device further includes a memory for reading out and storing the compressed data sampled in the data sampling circuit; a first switching circuit including a data expansion circuit for generating video data for the sub window by expanding the image data read from the memory; a digital-to-analog converter for converting the image data expanded in the data expansion circuit to obtain analog data; and a second switching circuit for switching the video data for a sub window output from the digital-to-analog converter to insert the video data in the sub window into the first video data. The first switch controls whether the data read from the memory are expanded for one size sub window or not expanded for another size sub window.

REFERENCES:
patent: 5398074 (1995-03-01), Duffield
patent: 5680177 (1997-10-01), Abe
patent: 5729300 (1998-03-01), Ahn
patent: 5852474 (1998-12-01), Nakagaki
patent: 5917958 (1999-06-01), Nunally

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