Image processing apparatus and image processing method

摘要

An image processing apparatus for performing screen processing on input image data via passes may include a screen processing unit, a detection unit, and a correction unit. The screen processing unit receives image data as received image data and performs screen processing on the received image data to produce screen-processed image data. The detection unit detects a difference of low frequency components between the received image data and the screen-processed image data. The correction unit corrects the screen-processed image data based on a difference detected by the detection unit. On subsequent passes, a process of at least one of the screen processing unit, the detection unit, and the correction unit is repeated to convert the input image data to screen-processed image.

主权项

1. An image processing apparatus for performing screen processing on input image data via passes, the image processing apparatus comprising:
a screen processing unit configured to receive the input image data or corrected image data as received image data and perform screen processing on the received image data to produce screen-processed image data; a detection unit configured to detect a difference between low frequency components of the input image data and low frequency components of the screen-processed image data; and a correction unit configured to correct pixel values in the input image data based on a difference detected by the detection unit to produce corrected image data, wherein at least one of the screen processing of the screen processing unit, the difference detection of the detection unit, and the input image data correction of the correction unit is repeated on a subsequent pass to convert the input image data to screen-processed image.