Acta Optica Sinica, Volume. 4, Issue 9, 847(1984)
Condition analysis of image contrast reversal by using π phase filter
A method of image contrast reversal by using π phase filter is theoretically analysed. Conditions for forming contrast reversal image in output plane by means of addition of phase factor e±iπ on zero frequency in frequency plane are discussed. Experimental results are given. This paper offers a theoretical base for using π phase filter in optical information processing.
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KANG HUI, LI ZHENGMING, Li BAOLUN, SUN YUEJIN. Condition analysis of image contrast reversal by using π phase filter[J]. Acta Optica Sinica, 1984, 4(9): 847