Defective pixel compensation device and method
A defective, pixel technology, applied in image communication, printing, electrical components, etc., can solve the problem of not compensating for defective pixels, consuming ink, etc.
Inactive Publication Date: 2007-01-10
SAMSUNG ELECTRONICS CO LTD
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In that case the compensation method may not be an effective way to compensate the defective pixels
In addition, since the method of ejecting an additional amount of ink on adjacent pixels needs to control the amount of ink, it requires delicate and complex control logic and circuits
Furthermore, the method of compositing black pixels can only be used in the black / white printing mode of a color printer and consumes an extra amount of ink unnecessarily
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[0036] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the following description, detailed descriptions of well-known functions and configurations incorporated herein have been omitted for clarity and conciseness.
[0037]For the purpose of illustration, it is assumed that the image forming apparatus to which the present invention is applied is a printer. However, the application of the present invention is not limited to printers, but can be easily applied to any imaging device that reproduces continuous grayscale images using limited levels of grayscale pixels.
[0038] image 3 is a block diagram of an apparatus for compensating defective pixels according to an embodiment of the present invention. The device includes: a defective imaging element determining unit 300 , a defective pixel information detecting unit 310 and a halftone unit 320 . Here, the halfton...
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An apparatus and a method for compensating for a defective pixel are provided. The apparatus includes a defective pixel information detecting unit and a halftoning unit. The defective pixel information detecting unit detects whether input continuous grayscale data forms a defective pixel caused by a defective image-forming element and outputs the detected result as defective pixel information. The halftoning unit reflects the defective pixel information in halftoning of the continuous grayscale data using error diffusion. In an image-forming apparatus (such as a printer, an LED etc) reproducing continuous grayscales using a plurality of image-forming elements each forming a limited grayscale, image quality deterioration caused by the defective pixel can be compensated for by performing halftoning in consideration of the defective image-forming element when some of the image-forming elements are defective.
Description
[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2005-0056230 filed in the Korean Intellectual Property Office on June 28, 2005, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an apparatus and method for compensating defective pixels. More specifically, the present invention relates to an apparatus and method for compensating for defective pixels capable of reproducing continuous gray scales ( For example, when some of a plurality of imaging elements in a printer or a light emitting diode (LED) are defective, deterioration in image quality caused by defective pixels is compensated for by performing halftoning in consideration of the defective imaging elements. Background technique [0004] Imaging devices such as printers or LEDs include multiple imaging elements for forming limited gray scale pixels. The imaging elem...
Claims
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IPC IPC(8): H04N1/405
CPCB41J2/2139H04N1/4015H04N1/4052B41J2/07
Inventor 姜奇珉姜龟守
Owner SAMSUNG ELECTRONICS CO LTD