Image analysis – Histogram processing – For setting a threshold
Patent
1990-04-27
1991-09-17
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
340727, 358448, G06K 936
Patent
active
050502255
ABSTRACT:
An image processing apparatus and method is disclosed for rapidly rotating images through selected angles by first generating each pel row of a scaled version of an original image in response to scaling values determined by the rotation angle selected; then performing horizontal shear and vertical shear operations, in response to values of horizontal and vertical shears determined by the selected rotation angle, and generating addresses in an output image memory into which the first pels of the pel rows of the scaled image are to be stored; in response to the value of vertical shear and the address of the first pel of each respective row, generating respective lines of addresses in the output memory into which all the remaining pels of each respective pel row of the scaled image are to be stored; and finally storing all the pels of the pel rows in the generated addresses of the output image memory. Also the lines are generated using a vertical shear control value such that the addresses of all the pels of a pel row in the output image memory are stored with vertical alignment of address transitions of the horizontally adjacent pels in all the pel rows in the rotated image.
REFERENCES:
patent: 4611232 (1986-09-01), Searby
patent: 4612540 (1986-09-01), Pratt
patent: 4618991 (1986-10-01), Tabata et al.
patent: 4637057 (1987-01-01), Kermisch
patent: 4759076 (1988-07-01), Tanaka et al.
Boudreau Leo H.
Dowd Thomas P.
International Business Machines - Corporation
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