| 摘要 |
An image forming apparatus and a method for improving image quality are provided to compare patterns of sub windows to determine an edge and a dot size of a center reference pixel, thereby reproducing a multi gray scale image and improving print quality. An image forming apparatus comprises a window generating unit(210), a determining unit(220) and a controller(230). The window generating unit generates a plurality of sub windows in a main window about an input image. The determining unit determines an edge area according to a pixel value of a binary image corresponding to each sub window by applying the generated sub windows to a binary image. The controller determines a dot size about the center reference pixel positioned in the center of the main window along with the edge area. The determining unit comprises a pattern determining unit(221) and an area determining unit(222). The pattern determining unit determines whether a pixel value of the binary image is equal according to a location of each pixel included in the sub windows. The area determining unit detects the number of pixel positions. When the number of pixel positions is smaller than a preset number, the area determining unit determines the pixel position as an edge area. When the number of pixel positions is bigger than the preset number, the area determining unit determines the pixel position as a flat area.
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