EP0359448A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Text recovery in colour compressed video
Assignee: International Business Machines Corp
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Filing: 1989-09-01
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Granted: —
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Expires: 2009-09-01
Abstract
Abstract A method for colour conversion comprising the steps of converting an n-bit original colour data supplied for each pixel to an m-bit (n>m) new colour data; comparing the new colour data with each other and the original colour data with each other with respect to a current pixel and a previous pixel which is a pixel immediately preceding the current pixel; and changing the value of the new colour data and sending it to a display unit when a match of the new colour data and a mismatch of the orignal colour data are detected by said comparison. This method therefore enables a colour data conversion characterised in that a change in the original colour can be recognised on a display screen.
Inventors
- 👤 Frank James Canova
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:28
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A colour conversion method comprising the steps of: converting an n-bit original colour data supplied for each pixel to an m-bit (n > m) new colour data; comparing the new colour data with each other and the original colour data with each other with respect to a current pixel and a previous pixel which is a pixel immediately preceding the current pixel; and changing the value of the new colour data of said current pixel and sending it to a display unit when a match of the new colour data and mismatch of the original colour data are detected by said comparison.
Claim 2
Dependent Claim
102 words
A colour conversion method comprising the steps of: converting an n-bit original colour data supplied for each pixel to an m-bit (n > m) new colour data; comparing the new colour data with each other and the original colour data with each other with respect to a current pixel and a previous pixel which is a pixel immediately preceding the current pixel; and changing the value of the new colour data of said current pixel and sending it to a display unit when a match of the new colour data and mismatch of the original colour data are detected by said comparison.
Claim 3
Dependent Claim
39 words
A colour conversion method as claimed in Claim 1 wherein said value change is performed in a direction corresponding to the increase or decrease direction of the original colour data value from said previous pixel to said current pixel.
Claim 4
Dependent Claim
149 words
A colour conversion apparatus comprising: conversion means for converting an n-bit original colour data supplied for each pixel to an m-bit (n > m) new colour data; first delay means for delaying the new colour data from said conversion means by one pixel; first comparison means for comparing the new colour data from said conversion means with the delayed new colour data from said first delay means; second delay means for delaying said original colour data by one pixel; second comparison means for comparing said original colour data with the delayed original colour data from said second delay means; and change means for receiving the new colour data from said conversion means, and for changing the value of said new colour data and sending it to a display unit when a match is detected in said first comparison means and a mismatch is detected in said second comparison means.
Claim 5
Dependent Claim
149 words
A colour conversion apparatus comprising: conversion means for converting an n-bit original colour data supplied for each pixel to an m-bit (n > m) new colour data; first delay means for delaying the new colour data from said conversion means by one pixel; first comparison means for comparing the new colour data from said conversion means with the delayed new colour data from said first delay means; second delay means for delaying said original colour data by one pixel; second comparison means for comparing said original colour data with the delayed original colour data from said second delay means; and change means for receiving the new colour data from said conversion means, and for changing the value of said new colour data and sending it to a display unit when a match is detected in said first comparison means and a mismatch is detected in said second comparison means.
Claim 6
Dependent Claim
41 words
A colour conversion apparatus as claimed in Claim 3 wherein said change means is an adder that increases or decreases the value of said new colour data by a predetermined amount according to the mismatch detected by said second comparison means.
References Cited (Backward Citations)
No citation records indexed.
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