Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-05
1993-05-04
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, 358160, H04N 5213, H04N 718
Patent
active
052086739
ABSTRACT:
A method for reducing noise in a reference frame of video information by determining the mean absolute difference, MAD.sub.o, between each block in the reference frame and identically located blocks in adjacent frames. If MAD.sub.o is <A, the block in an adjacent frame is held for averaging with the block in the reference frame, but if MAD.sub.o for the block is >A, a search is made for a block in the adjacent frame that matches the block in the reference frame. This is labelled MAD.sub.min. If MAD.sub.o for the block in the adjacent frame is <BMAD.sub.min, the matching block is not used in the average. If MAD.sub.o is not <BMAD.sub.min, the matching block can be used in the average, but preferably this is not done if MAD.sub.min exceeds a value C. The values of A, B and C are determined by experience for the block size used.
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Groody James J.
Lee Michael H.
Matsushita Electric Corporation of America
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