Browse Prior Art Database

Video Resolution Enhancer

IP.com Disclosure Number: IPCOM000043381D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Nguyen, M: AUTHOR [+2]

Abstract

A video resolution enhancer converts a grey level picture of given resolution to an approximate binary picture of 16 times the spatial distribution, the conversion being done on a pixel (picture element) to pixel basis in realtime. The video resolution enhancer takes a field of nine pixels from the video system and expands the center pixel into a four-by-four matrix. The heart of the enhancer is a resistor matrix in which the sum voltage of all the nodes is constant. This is achieved through an arrangement of current injectors that convert the surrounding pixel's relative voltage into a distributed network of active current source.

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Video Resolution Enhancer

A video resolution enhancer converts a grey level picture of given resolution to an approximate binary picture of 16 times the spatial distribution, the conversion being done on a pixel (picture element) to pixel basis in realtime. The video resolution enhancer takes a field of nine pixels from the video system and expands the center pixel into a four-by-four matrix. The heart of the enhancer is a resistor matrix in which the sum voltage of all the nodes is constant. This is achieved through an arrangement of current injectors that convert the surrounding pixel's relative voltage into a distributed network of active current source. All node voltages are read by a controlled threshold cumulative comparator which is a circuit that generates a proportional voltage from the center pixel's grey level, and extracts from the matrix a total node value such that the node count equals the relative value of the center pixel. Node selection is based on highest voltage, and the net result of the device is the selection of nodes representing valid sub-pixels forming the enhanced image. Node selection is based on the continuity concept. The system achieves the multiplication of linear resolution by a factor of four such that, for example, a 256 x 256-pixel/analog camera functions as a 1024 x 1024-pixel/bit sliced camera.

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