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US 8,553,279 B2Granted
Image forming apparatus and a control method to improve image quality based on an edge pixel
AssigneeSamsung Electronics Co., Ltd.
InventorQuan Do
Life of this patent
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Abstract
An image forming apparatus and a control method to improve image quality. In the image forming apparatus, an edge detecting unit detects an edge pixel from scanned image data, an edge processing unit determines whether the edge pixel is a color edge pixel or a black edge pixel and applies independent edge processing methods to the color edge pixel and the black edge pixel, and a print unit prints the scanned image data using the processed edge pixel.
Claims17
An image forming apparatus to improve image quality, the image forming apparatus comprising:
- an edge detecting unit to detect an edge pixel from image data;
- an edge processing unit to determine whether the edge pixel is a color edge pixel or a black edge pixel by using a chrominance component of the edge pixel, the edge processing unit comprising:
- a color edge adjusting unit to apply a first edge sharpening method to the edge pixel if the edge pixel is the color edge pixel, the first edge sharpening method including determining an area of the image data where the color edge pixel is located and adjusting a luminance value of the color edge pixel with reference to luminance values of pixels adjacent to the color edge pixel in the determined area;
- and
- a black edge adjusting unit to apply a second edge sharpening method to the edge pixel if the edge pixel is the black edge pixel such that the first edge sharpening method and the second edge sharpening method are different;
- and
- a print unit to print the image data using the processed edge pixel.
4 more elements
A control method to improve image quality, the control method comprising:
- detecting an edge pixel from image data;
- determining whether the detected edge pixel is a color edge pixel or a black edge pixel by using a chrominance component of the edge pixel;
- applying a first edge sharpening method to the detected edge pixel if the detected edge pixel is determined to be the color edge pixel, the first edge sharpening method including determining an area of the image data where the color edge pixel is located and adjusting a luminance value of the color edge pixel with reference to luminance values of pixels adjacent to the color edge pixel in the determined area;
- applying a second edge sharpening method to the detected edge pixel if the detected edge pixel is determined to be the black edge pixel such that the first edge sharpening method and the second edge sharpening method are different;
- and
- printing the image data using the sharpened edge pixel.
3 more elements
An image forming apparatus, comprising:
- an pixel edge determining unit to determine whether image input data includes an edge pixel of an image, and to output determined edge pixels on a separate output path than determined non-edge pixels;
- an edge processing unit to divide determined edge pixels into black edge pixels and non-black edge pixels by using a chrominance component of the edge pixels, and to output black edge pixels on a separate output path than non-black edge pixels;
- a black edge sharpening unit to apply a first sharpening method to the black edge pixels;
- a non-black edge sharpening unit to apply a second sharpening method to the non-black edge pixels such that the first sharpening method and the second sharpening method are different and the second sharpening method includes determining an area of the image data where the non-black edge pixel is located and adjusting a luminance value of the color edge pixel with reference to luminance values of pixels adjacent to the color edge pixel in the determined area;
- and
- a print unit to print the image input data using the sharpened black edge pixels and the sharpened non-black pixels.
3 more elements
Dependencies are inferred from the claim text.