Method and apparatus for compression coding of image data representative of a color image and digital camera including the same
US6144763A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Mar 18, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8047
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image data compression coding apparatus of the present invention includes a signal processing section for processing RGB (Red, Green and Blue) color image data input from an imaging device to thereby output YC (luminance and chrominance) image data consisting of luminance data and chrominance data. When a monochrome mode is set by a system controller, the signal processing section fixes the values of chrominance data to zero. The luminance data and fixed chrominance data are written to a frame memory and then sequentially read out of the memory in blocks component by component. A compression coding section codes the image data red out of the memory by use of a JPEG (Joint Photographic Coding Expert Group) system. As for the coded data of the chrominance data, Huffman codes are assigned only to DC components and EOB codes. As a result, an amount of codes produced by subtracting the amount of codes allocated to the chrominance data from a desired total amount of code is entirely allocated to the luminance data as a target amount of code. After the luminance data have been coded in the target amount, the chrominance data are sequentially coded. A method for implementing the ap…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.