| 摘要 |
PROBLEM TO BE SOLVED: To attain sharp image processing without distortion by eliminating block distortion by smoothing processing and applying edge emphasis processing to an edge substantial to an image on a block border. SOLUTION: A noted picture element and picture elements a-i in the vicinity of the noted picture element are obtained by 1-line delay circuits 1, 2 delaying an input signal and 1-picture element delay circuits 3, 4, 5, 6, 7, 8. An edge detection circuit 9 obtains a level difference between the noted picture element (e) and picture elements a-d, and f-i in the vicinity of the noted picture element. When all of level differences are smaller than the threshold level, a smoothing filter 12 is selected for the processing. When a level difference with respect to the picture elements in the vicinity of the noted picture element in a direction orthogonal to the block border exceeds the threshold level, the processing of selecting an edge emphasis filter 13 is conducted. |
