Image processing apparatus and image processing system

Details Image processing apparatus and image processing system Image processing apparatus and image processing system

2005-11-22

2005-11-22

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphic processing system

Integrated circuit

C345S077000, C345S589000

Reexamination Certificate

active

06967660

ABSTRACT:
To enable a brightness histogram operation without requiring a special-purpose integration circuit and memory.An image processing apparatus is provided with a gamma correction processing part. The gamma correction processing part6includes a LUT operation circuit10having a LUT memory11for gamma correction, a simplified gamma correction circuit12, selectors14and15, and a register13. When the gamma correction processing part6is used exclusively for gamma correction, the CPU3makes the register13hold aw control signal of L level to thereby cause the selectors14and15to select “0” terminals. The LUT memory11selects and outputs a gamma correction value (LUT conversion value) while referring to input pixel data as address data. On the other hand, when the gamma correction processing part6is used for brightness histogram operation, the CPU3makes the register13hold a control signal of H level to thereby cause the selectors14and15to select “1” terminals. The LUT memory11is used as a memory for storing an accumulation value of the brightness histogram operation.

REFERENCES:
patent: 4931864 (1990-06-01), Kawamura et al.
patent: 6046827 (2000-04-01), Ogoshi et al.

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