Imaging processing method and apparatus suitably used for obtain

Details Imaging processing method and apparatus suitably used for obtain Imaging processing method and apparatus suitably used for obtain

1988-10-26

1991-09-03

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

364522, 378901, G06K 900, G06F 1500, H01J 1500

Patent

active

050461087

ABSTRACT:
An image processing apparatus for obtaining a shading image from a plurality of two-dimensional tomogram images includes a first obtaining section for obtaining a plurality of distance gradation images from the plurality of two-dimensional tomogram images and a second obtaining section for obtaining a distance image having density data is selected from the distance gradation image density data in units of pixels in gradation. The distance image has density data representing, in gradation, distances from a pre-designated area on a pre-designated plane to an object in gradiation. The image processing apparatus further includes a third obtaining section for obtaining a normal image having as density data normal vector components of the object from the distance image, and a fourth obtaining section for obtaining the shading image having as density data luminance data obtained from the density data of the normal image and direction data representing a designated direction from when the object is viewed.

REFERENCES:
patent: 3621214 (1971-11-01), Romney et al.
patent: 4737921 (1988-04-01), Goldwasser et al.
patent: 4862391 (1989-08-01), Ohhashi
patent: 4901064 (1990-02-01), Deering
Lih-Shyang Chen et al., "Surface Shading in the Cuberille Environment", IEEE Computer Graphics and Applications, Dec. 1985, pp. 33-43.

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