Reduction of moire by adaptively selecting a smoothing filter fo

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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355445, 355463, 355462, 355467, 355457, 355456, 355464, 355433, 355455, 382 22, 382 54, 382 56, H04N 140, H04N 138, G06K 940, G06K 936

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054083370

ABSTRACT:
An image processing apparatus in which a moire occurring in a half tone area can be eliminated by a suitable filter. A plurality of data blocks comprising N*N pixel data are transformed by means of a two-dimensional orthogonal transform so as to obtain an N*N matrix transformation factor block. An evaluation block is prepared which comprises N*N transformation factors each of which is the mean value of the absolute values of corresponding factors from a data block being considered and data blocks surrounding the data block to be determined. Mean values A[i] and B[i] (i=0 to L-1) of predetermined transformation factors are calculated, A[i] being mean values of factors included in a number L of first areas consecutively positioned along a diagonal line of the evaluation block, B[i] being mean values of factors included in a number L of second areas positioned adjacent to and lower in frequency to the corresponding first areas. A filter selection signal is generated which corresponds to the number i when a condition is satisfied where A[i]>B[i] and A[i]>threshold value th1. The pixel data corresponding to the evaluation block is smoothed by the selected filter.

REFERENCES:
patent: 5287200 (1994-02-01), Sullivan et al.
patent: 5359676 (1994-10-01), Fan
patent: 5371611 (1994-12-01), Kato et al.

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