发明名称 |
Spread spectrum digital screening |
摘要 |
A spread spectrum digital screening mask and a method and system for digital screening a continuous tone image with the spread spectrum digital screening mask. The mask is characterized in the frequency domain by a function in magnitude independent of angle within a band of frequencies between a minimum frequency and a maximum frequency. The mask may be further characterized by its thresholded binary planes at each of a plurality of predetermined threshold values. The binary planes are characterized in frequency domain by magnitudes primarily distributed within the band of frequencies. For each binary plane, the number of pixels having one of the binary values divided by the total number of pixels in the binary plane equals a fraction determined by the predetermined threshold value of the binary plane divided by the maximum threshold value.
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申请公布号 |
US5689623(A) |
申请公布日期 |
1997.11.18 |
申请号 |
US19950410785 |
申请日期 |
1995.03.27 |
申请人 |
OPTRONICS INTERNATIONAL CORPORATION |
发明人 |
PINARD, ADAM I. |
分类号 |
H04N1/405;(IPC1-7):G06K15/00;H04N1/40 |
主分类号 |
H04N1/405 |
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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