Image Processing Apparatus Edge Artifact Removal

The correction processing is divided into two distinct segments: first correction processing that selectively increases brightness of pixels within a specified luminance range, and second correction processing that changes color of specified color pixels. This segmentation allows each processing stage to address specific aspects of the problem without interfering with the other, effectively preventing edge artifacts while maintaining object deletion accuracy.

The first correction processing is performed as a preliminary step before the second correction processing. By pre-increasing the brightness of pixels in the specified luminance range, the patent prepares the image data to prevent edge artifacts from forming during or after the color-based deletion operation, thereby improving character recognition accuracy before the actual deletion occurs.

The first correction processing applies brightness enhancement selectively only to pixels whose luminance falls within a predetermined range, rather than uniformly to all pixels. This localized approach ensures that only the relevant pixels (those likely to form edge artifacts) are modified, preserving the color accuracy of other pixels while still preventing edge visibility.

The patent modifies the luminance parameter of selected pixels without changing their color properties. By adjusting only the brightness component of pixels within the specified luminance range, the patent prevents edge artifacts while maintaining the original color information of all pixels, which is then used in the second correction processing for accurate object deletion.