Image forming apparatus and method for making density correction in a low resolution image based on edge determination
AssigneeCanon Kabushiki Kaisha
InventorsYoichi Kashibuchi, Hiroshi Kaburagi
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Abstract
The image forming apparatus comprises a resolution converting unit configured to convert a high-resolution image data into a low-resolution image data, an edge judgment unit configured to judge a shape of an edge in the high-resolution image data, and a density correcting unit configured to make a density correction in the low-resolution image data in accordance with the shape of the edge judged by the edge judgment unit.
Claims7
An image forming apparatus comprising:
- a resolution converting unit configured to convert high-resolution image data into low-resolution image data;
- an edge judgment unit configured to judge an edge for each region composed of a plurality of pixels in the high-resolution image data;
- and
- a density correcting unit configured to make density correction in the low-resolution image data so that the less the number of pixels having a value larger than a threshold value in a region judged as an edge by the edge judgment unit, the larger increase rate of a density in the region of the low-resolution image data corresponding to the region.
An image forming method executed by an image forming apparatus, comprising the steps of:
- converting high-resolution image data into low-resolution image data;
- judging an edge for each region composed of a plurality of pixels in the high-resolution image data;
- and
- making density correction in the low-resolution image data so that the less the number of pixels having a value larger than a threshold value in a region judged as an edge by the edge judgment unit, the larger increase rate of a density in the region of the low-resolution image data corresponding to the region.
A computer-executable program storable in a non-transitory computer readable memory medium for performing by a computer an image forming method comprising the steps of:
- converting high-resolution image data into low-resolution image data;
- judging an edge for each region composed of a plurality of pixels in the high-resolution image data;
- and
- making density correction in the low-resolution image data so that the less the number of pixels having a value larger than a threshold value in a region judged as an edge by the edge judgment unit, the larger increase rate of a density in the region of the low-resolution image data corresponding to the region.
Dependencies are inferred from the claim text.