发明名称 |
IMAGE DATA PROCESSING UNIT, IMAGE DATA PROCESSING METHOD, PROGRAM, AND RECORDING MEDIUM |
摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image data processing unit that can correct a quantization error of an image data component after inverse conversion into prescribed frequency conversion without the need for troublesome processing. SOLUTION: A range over pixel check means 41 seeks a pixel having a component in excess of an upper limit of a range and a component correction means 42 decreases the component value of the pixel so as to be kept within the range. The decreased value can be compensated by deciding a pixel in advance and increasing the same component of the pixel through the use of a stochastic magnification correlation of a product between each element of a matrix used for the inverse conversion and each quantization error caused in a frequency conversion coefficient multiplied with each element by means of a component value distribution means 43.</p> |
申请公布号 |
JP2002369009(A) |
申请公布日期 |
2002.12.20 |
申请号 |
JP20010175009 |
申请日期 |
2001.06.11 |
申请人 |
RICOH CO LTD |
发明人 |
SAKUYAMA HIROYUKI |
分类号 |
H04N11/04;H04N1/40;H04N1/41;H04N19/102;H04N19/136;H04N19/182;H04N19/186;H04N19/60;H04N19/63;H04N19/70;(IPC1-7):H04N1/41;H04N7/30 |
主分类号 |
H04N11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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