| 摘要 |
<p>A color image data compression coding apparatus of the present invention includes a signal processing section (16) 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 (18), the signal processing section (16) fixes the values of chrominance data to zero. The luminance data and fixed chrominance data are written to a frame memory (22) and then sequentially read out of the memory (22) in blocks component by component. A compression coding section (24) codes the image data read out of the memory (22) 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 (End of Block) 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 apparatus and a digital camera incorporating the apparatus are also disclosed. <IMAGE></p> |
