Method and apparatus for rotating a multivalued picture image 90

Details Method and apparatus for rotating a multivalued picture image 90 Method and apparatus for rotating a multivalued picture image 90

1994-02-17

1995-12-26

Razavi, Michael T.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

395137, 348583, 345126, G06T 360

Patent

active

054795257

ABSTRACT:
To rotate a multivalued source picture image consisting of picture data arranged in N rows.times.(m gradations*N) columns 90 degrees, calculating a maximum value of a transposition mode L according to an equation M=[log.sub.2 N], repeatedly selecting an A-th row by increasing a row number A in increments of 1 in the range k*2.sup.L .ltoreq.A.ltoreq.k*2.sup.L +2.sup.L-1 -1 in an inner loop and increasing a value k in increments of 1 in the range 0.ltoreq.k.ltoreq.N/2.sup.L -1 in a middle loop while increasing the transposition mode L in increments of 1 in the range of 1 to M in an outer loop, selecting a B-th row according to an equation B=A+2.sup.L-1 each time the A-th row is selected, transposing the picture data A(j) arranged at j-th columns of the A-th row to A'(j) and the picture data. A(j+m*2.sup.L-1) to B'(j) arranged at the B-th row in the range p*m*2.sup.L .ltoreq.j.ltoreq.p*m*2.sup.L +m*2.sup.L-1 -1 and 0.ltoreq.p.ltoreq.N/2.sup.L -1, transposing the picture data B(j) arranged at j-th columns of the B-th row to B'(j) and the picture data B(j-m*2.sup.L-1) to A'(j) in the range p*m*2.sup.L +m*2.sup.L-1 .ltoreq.j.ltoreq.p*m*2.sup.L +m*2.sup.L -1 to form a quasi-transposed picture image, and changing picture data E(i,m*(N-j-1)+q) of the quasi-transposed picture image to F(m*j+q) in the range 0.ltoreq.j.ltoreq.N-1 and 0.ltoreq.q.ltoreq.m-1 to form a destination picture image.

REFERENCES:
patent: 4918527 (1990-04-01), Penard et al.
patent: 5034733 (1991-07-01), Okazawa et al.
patent: 5124692 (1992-07-01), Sasson
patent: 5412768 (1995-05-01), Ozaki

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