US 6,211,917 B1Granted

Method for performing plural matrix multiplication operations using a shared look-up table

OwnerRong-Fuh Shyuinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

In a method and apparatus for converting digitized luminance-chrominance color space signals to digitized RGB color space signals, a first combining unit generates a plurality of predetermined linear combinations of the chrominance color space signals received by a multiplexed multiplication unit which includes no more than two look-up tables that contain digitized transformation values for performing matrix multiplications of the linear combinations of the chrominance color space signals. A second combining unit linearly combines the digitized transformation values outputted by the multiplexed multiplication unit and a predetermined binary combination of the luminance color space signal in a first predetermined manner to generate three RGB color combination signals. A third combining unit linearly combines the RGB color combination signals in a second predetermined manner to obtain the RGB color space signals.

Claims3

Dependent claims

A method for performing plural matrix multiplication operations, a first one of the matrix multiplication operations being performed to obtain a product of a predetermined coefficient and a first variable, a second one of the matrix multiplication operations being performed to obtain a product of the predetermined coefficient and a second variable, the method comprising:

constructing a look-up table having a plurality of entries, each of the entries corresponding to one of a plurality of values of the first and second variables and stored in each of the entries is a product of a corresponding value of the first and second variables multiplied by the predetermined coefficient;
and determining one of the plurality of values of the first and second variables to select a corresponding one of the entries in the look-up table, such that the product stored in the corresponding one of the entries is generated at an output of the look-up table, thereby obtaining a result of a selected one of the first and second multiplication operations.

Dependencies are inferred from the claim text.

Facts

Application: 09/383,152Filed 25 Aug 1999 · continuation
Priority: 10 Jun 1997
Granted: 3 Apr 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04N 9/67
Circuits for processing colour signals: for matrixing
G09G 5/02
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators: characterised by the way…
G09G 5/06
Characterised by the way in which colour is displayed: using colour palettes, e.g. look-up tables
H04N
Pictorial communication