Patent ID: 6967660

Claim:
An image processing apparatus for executing a brightness histogram operation and a gamma correction process for input image data, comprising: a lookup-table memory, for receiving pixel data of said image data as address data, and outputting storage data designated by said address data as a gamma conversion value corresponding to a brightness value of said pixel data, in a first operational mode; an incremental circuit for outputting to said lookup-table memory an accumulation value for said brightness histogram operation which is obtained by incrementing an output value from said lookup-table memory, whenever said pixel data is inputted to said lookup-table memory, in a second operational mode; a controller for executing said brightness histogram operation by rewriting said output value stored in a storage area of said lookup-table memory into said accumulation value, in said second operational mode; and a circuit for executing said gamma correction process in parallel with said brightness histogram operation without using said lookup-table memory, during a period when said brightness histogram operation uses said lookup-table memory in said second operational mode.