EP0724249A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for identifying video pixel data format in a mixed format data stream
Assignee: International Business Machines Corp
•
Filing: 1995-12-20
•
Granted: —
•
Expires: 2015-12-20
Abstract
Abstract A method and apparatus for a computer graphics system which identifies the format of video pixel data in a data stream potentially having a plurality of data formats is disclosed. The method comprises the steps of (a) receiving pixel data; (b) selecting an output channel in response to at least one particular value of at least one bit of each said received pixel datum wherein the particular value identifies the data format; and (c) providing said pixel data to said selected output channel. Also provided is a circuit in a video graphics controller and a computer system having such circuit according to the method.
Inventors
- 👤 Edward Kelley Evans
- 👤 Roderick Michael Peters West
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:00
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/06; G09G5/36; G09G5/39; G09G5/395
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
65 words
A method for identifying the format of video pixel data in a data stream comprising the steps of a) receiving pixel data; b) selecting an output channel in response to at least one particular value of at least one bit of each said received pixel datum wherein the particular value identifies the data format; and c) providing said pixel data to said selected output channel.
Claim 2
Dependent Claim
26 words
The method of claim 1 wherein the output channel is selected in response to a particular value of one bit of each said received pixel datum.
Claim 3
Dependent Claim
28 words
The method of claim 2 wherein the output channel is selected in response to a particular value of the most significant bit of each said received pixel datum.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the pixel data is received from a video frame buffer.
Claim 5
Dependent Claim
59 words
The method of claim 1 wherein the output channel is selected from the group consisting of an output channel in communication with a plurality of DACs responsive to an RGB format pixel data and an output channel in communication with a means for converting pixel data having a format other than said RGB into said RGB format pixel data.
Claim 6
Dependent Claim
40 words
The method of claim 5 wherein said means for converting pixel data having a format other than said RGB into said RGB format pixel data comprises a means for converting YUV format pixel data into said RGB format pixel data.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the data stream comprises video pixel data having a plurality of formats.
Claim 8
Dependent Claim
51 words
The method of claim 7 wherein the data stream comprises video pixel data having a 555_RGB format and video pixel data having a modified 4:2:2 YUV format wherein bits 0 to 6 represent chrominance, bits 7 through 14 represent luminance, and bit 15 represents the particular value identifying the data format.
Claim 9
Dependent Claim
54 words
The method of claim 7 wherein the data stream comprises 16 bpp video pixel data having a CLUT8 format and 16 bpp video pixel data having a 4:2:2 YUV format, and wherein at least one particular value of the eight most significant bits of each video pixel datum identifies the data format as CLUT8.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein the output channel is selected in response to at least one particular value of four bits of each said received pixel datum.
Claim 11
Dependent Claim
31 words
The method of claim 10 wherein the output channel is selected in response to at least one particular value of the four most significant bits of each said received pixel datum.
Claim 12
Dependent Claim
70 words
The method of claim 10 wherein the data stream comprises 16 bpp pixel data selected from the group consisting of modified 444_RGB format data and modified CLUT12 format data, together with 16 bpp video pixel data having a 4:2:2 YUV format, and wherein at least one particular value of the four most significant bits of each video pixel datum identifies the data as having a format selected from said group.
Claim 13
Dependent Claim
28 words
The method of claim 1 wherein the output channel is selected in response to at least one particular value of eight bits of each said received pixel datum.
Claim 14
Dependent Claim
31 words
The method of claim 13 wherein the output channel is selected in response to at least one particular value of the eight most significant bits of each said received pixel datum.
Claim 15
Dependent Claim
16 words
The method of claim 13 wherein the pixel data is received from a video frame buffer.
Claim 16
Dependent Claim
35 words
The method of claim 13 wherein the output channel is selected from the group consisting of an output channel responsive to YUV format pixel data and an output channel responsive to CLUT8 format pixel data.
Claim 17
Dependent Claim
31 words
The method of claim 13 wherein at least one output channel is in communication with a means for converting pixel data from a first data format to a second data format.
Claim 18
Dependent Claim
25 words
A circuit in a video graphics device comprising means for carrying out the steps of the method according to anyone of claims 1 to 17.
Claim 19
Dependent Claim
13 words
A computer system having a video graphics device circuit according to claim 18.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.