发明名称 |
A method for processing gray scale picture elements to facilitate data compression. |
摘要 |
<p>A process is described for identifying those pels in a gray scale image which are candidates for vertical filtering before the image is thresholded to binary or black/white pel values. The vertical neighbor pels of a pel below a run end point are examined to determine whether their gray scale values fall within the same range. If they do, the horizontal neighbors of the current pel are examined to see whether their gray scale values fall in different ranges. If they do, the pel is vertically filtered by adjusting its gray scale value as a function of the differences between its value and the values of its vertical neighbors. Because only selected pels are vertically filtered, the process can be carried out with a general purpose microprocessor rather than a special purpose parallel processor.</p> |
申请公布号 |
EP0154766(A2) |
申请公布日期 |
1985.09.18 |
申请号 |
EP19850100005 |
申请日期 |
1985.01.02 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BELLINGHAUSEN, JOAN MARIE |
分类号 |
H04N7/14;G06T3/40;G06T9/00;H04N1/403;H04N1/409;H04N1/41 |
主分类号 |
H04N7/14 |
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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