Method of and apparatus for producing shadowed images

Details Method of and apparatus for producing shadowed images Method of and apparatus for producing shadowed images

1993-07-23

1996-09-10

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

395138, 395151, 345139, G06T 1550

Patent

active

055553532

ABSTRACT:
A shadowing process in which offset values .DELTA.x and .DELTA.y indicating a gradient and a range of the shadowing effect are set as shadowing parameters. A target linework image area G is extracted from original image data on an n-th scanning line. On the next (n+1)-th line, a shadow pixel S1 is obtained for a start pixel GO of the target linework image area G according to a gradient k calculated by the offset values .DELTA.x and .DELTA.y. A shadow line segment on the (n+1)-th scanning line is determined based on the shadow pixel S1 and a length L of the target linework image area G. Shadow line segments are determined for (n+2)-th and (n+3)-th scanning lines in the same manner. The shadow line segments are combined to make a shadow area S.

REFERENCES:
patent: 5255353 (1993-10-01), Itoh

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