Hardware median filter

Details Hardware median filter Hardware median filter

1982-06-29

1985-04-23

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

364900, 382 34, 382 36, 382 41, G06K 900, G06F 706, G06F 964

Patent

active

045134405

ABSTRACT:
A hardware median filter, particularly useful for processing high resolutions imagery data is coupled to a set of line buffers to which pixel data for an image of interest is applied, to define a segment or window within the overall image. This multibit data is then propagated through a set of n-pipelined filter processing sections (where n is the number of bits/pixel). Each section examines a particular bit position of the windowed pixels, the first section examining the most significant bit, while the final section examines the least significant bit. Each section contains a set of input registers which store M pixel-data values that have been coupled to it from the previous section. Each respective section contains a majority decision circuit that looks at a particular bit position and decides which bit (zero or one) represents the majority. As a result of this decision, the data bits of the stored pixel-data are either transferred, as is, to the next downstream section, or they are converted to all ones or all zeroes, and that converted data value is passed on to the next section, while the bit value that was determined to be the majority value for that particular bit position is designated as the corresponding bit of the median value. These determined bits for the median are extracted from each successive section in order to derive an output word representative of the median value of all the pixels in the window.

REFERENCES:
patent: 3336580 (1967-08-01), Armstrong
patent: 4110837 (1978-08-01), Chen
patent: 4295206 (1981-10-01), Cain et al.
patent: 4334244 (1982-06-01), Chan et al.
patent: 4410960 (1983-10-01), Kasuya
patent: 4439840 (1984-03-01), Coleman et al.

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