Patent ID: 8681369

Claim:
An image processing apparatus, comprising: a line memory capable of writing and reading image data of one line; a clock generator; a write/read controller for controlling writing and reading of the image data of one line in and from the line memory, the write/read controller reads the image data of one line from the line memory using a read clock; a white line determiner for determining whether or not an image corresponding to the image data of one line being written in the line memory by the write/read controller is a white line; an image processor capable of performing a specified image processing on the image data of one line read from the line memory by the write/read controller; a white data storage storing white data; and an image processing controller for controlling to generate an operation clock used in the image processor and cause the image processor to perform the specified image processing for the image data of one line determined not to be a white line by the white line determiner and controlling to stop generating the operation clock and read the white data from the white data storage for the image data of one line determined to be a white line by the white line determiner, the image processing controller generates the read clock for the image data of one line determined not to be a white line by the white line determiner and stops generating the read clock for the image data of one line determined to be a white line by the white line determiner, and wherein the image processing controller includes: a signal output device for outputting a first mask signal and a second mask signal for the image data of one line determined to be a white line by the white line determiner; a first OR gate which is an OR gate to which a clock generated by the clock generator is input, outputs the clock as the read clock unless the first mask signal is input and does not output the read clock if the first mask signal is input; and a second OR gate which is an OR gate to which the clock is input, outputs the clock as the operation clock unless the second mask signal is input and does not output the operation clock if the second mask signal is input.