| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image data coding method that enhances efficiency much more. SOLUTION: An image coder adopting the image data coding method is provided with a difference data calculation section 2, a difference data storage section 3, a variable length coding table generating section 4, a variable length coding table storage section 1, a variable length coding section 5, and coding data storage section 6, calculates difference data from a pixel value of original image data, generates a variable length coding table on the basis of the obtained data, and converts the image data into variable length coded data. Through the configuration above, the image coder uses a coding table calculated in a preceding line and conducts coding of image data of a current line and generates the coding table of the current line in parallel by handling the input data as the image in the unit of lines. The image coder divides the image in the unit of lines and conducts a coding step where a target line is coded by using the coding table calculated in the preceding line and a step where the coding table is generated in parallel to attain high-speed processing.</p> |
