United States Patent
US Patent 5450500: High-definition digital video processor
US 5450500 ยท granted 1995-09-12
| Patent Number | 5450500 |
|---|---|
| Title | High-definition digital video processor |
| Filed | 1993-04-09 |
| Granted | 1995-09-12 |
| Inventor(s) | Steven Brett |
| Assignee | Pandora International Ltd |
| CPC Classification | H04N9/00, H04N9/64, H04N9/646 |
| Number of Claims | 4 |
Abstract
A digital video processor which is usable as a secondary digital color processor (DCP) with standard-definition digital telecines and is also compatible with high-definition television systems, for correcting video color and other attributes such as pixel location and sharpness. The disclosed video processor has an architecture in which only the pixels and/or regions of a video picture to be modified have any processing applied to them, so that most pixels, which are unmodified, remain free from any potential corruption. It identifies pixels to be modified by means of lookup tables which can be loaded for each frame with data indicating attributes such as hue, saturation, and luminance values or ranges which are to be present in a pixel if that pixel is to be selected for modification, the pixel’s attributes being applied to each lookup table as an address. The DCP has multiple channels, with precedence logic to control the priority order of the channels, in order to apply only one particular set of modification increments associated with only one channel, in the event that more than one set of selection attributes are applicable to a given pixel. The system is capable of standard- or reduced-definition modification of portions within a high-definition picture.
Claims Summary
1. A digital video processor which replaces selected digital pixels in a data stream with modified pixels without replacing unselected digital pixels, comprising:an input circuit which receives a data stream of digital pixels representative of pixels in a video picture;