Filter for image pixels

Details Filter for image pixels Filter for image pixels

1980-08-04

1982-05-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250211J, H01J 4014

Patent

active

043284264

ABSTRACT:
A separable two dimensional Finite Impulse Response (FIR) digital image processing filter with X-dimension filter section having a delay buffer series to which digitized image signals or pixels are first input. The buffer inputs and output are tapped and pixels tapped off are processed by preset multiplier factors and input to an adder where the processed pixels are summed. The summed pixels are fed to a line buffer series of a Y-dimension filter section, tapped off from the filter inputs and output, and processed by further preset multiplier factors. The processed pixels are input to a second adder and summed to provide filtered output pixels.
In a second embodiment, the filter is symmetric and has a center point response of unity. In a third embodiment, the filter X and Y dimension filter sections are reversed.

REFERENCES:
patent: 3997911 (1976-12-01), Perriman et al.
patent: 4032978 (1980-06-01), Wong
patent: 4040094 (1977-08-01), Everett et al.
patent: 4084196 (1978-04-01), Tisue et al.
Digital Image Processing, William K. Pratt, pp. 201-205 and 266-271, 1978.

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