Apparatus and method of compressing dynamic range of image

Details Apparatus and method of compressing dynamic range of image Apparatus and method of compressing dynamic range of image

2008-06-03

2008-06-03

Bella, Matthew C. (Department: 2624)

Image analysis

Image transformation or preprocessing

General purpose image processor

Reexamination Certificate

active

07382941

ABSTRACT:
An apparatus to compress a dynamic range of an image, and a method of compressing the dynamic range. The apparatus includes a periphery value production unit to calculate periphery information about peripheral pixels on a polyhedron-by-polyhedron basis using summed area tables produced form an analog pixel stream of a previous frame of the image, multiply the periphery information by predetermined weight values, sum results of the multiplications, and output the sum as a periphery value; and a pixel value correction unit to correct a pixel value of a target pixel included in an analog pixel stream of a current frame using the periphery value; wherein the peripheral pixels are located around the target pixel and included in the previous frame, and a kernel distribution expressed in a kernel function, which is a distribution of weight values dependent on locations of pixels included in the image, is approximated to a sum of the polyhedrons.

REFERENCES:
patent: 7218324 (2007-05-01), Pfister et al.
Greene et al., Error-Bounded Antialiased Rendering of Complex Environments, 1994, ACM Press,pp. 59-66.
Crow, Summed-Area Tables for Texture Mapping, ACM Press, 1984, pp. 207-212.
Jobson et al., “Properties And Performance Of A Center/Surround Retinex”,IEEE Transactions on Image Processing, vol. 6, No. 3, Mar. 1997, pp. 451-462.
Moore et al., “A Real-Time Neural System For Color Constancy”,IEEE Transactions On Neural Networks, vol. 2, No. 2, Mar. 1991.

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