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The Research of Enhancement of Color Images in DCT Domain

Author: SongXuDong
Tutor: JiXiuHua
School: Shandong Institute of Economics
Course: Applied Computer Technology
Keywords: Image processing Color enhancement DCT Blockiness DC image Histogram equalization
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 136
Quote: 0
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Abstract


With the rapid development of network communication and multimedia technologies , image compression and enhancement is becoming increasingly important . Currently being widely used in the image / video international compression standard (JPEG, MPEG , etc. ) usually used the block DCT quantization \For various codec standards have been fixed , images and video post-processing image enhancement . The current the application widespread concern in the progressive transmission of compressed image . Progressive transmission process fast compressed image enhancement DCT domain image enhancement technology is very urgent . The DCT Domain image enhancement technology can eliminate the inverse transform to airspace and is transformed back into DCT domain of computational overhead . Most image enhancement algorithms for the grayscale image , simply for the color image enhancement of the algorithm were applied to the color image of R , G , B three components , or only a color conversion of the luminance component Y processing , no Taking into account the changes in color of the image . The display of the color image , however , rely on three basic factors , namely brightness , contrast, color . Enhancement of color images to consider not only the luminance component but also consider the chrominance components of the image color is maintained . This article describes the simulation to achieve enhanced color image DCT coefficients of a scaling algorithm Color Enhancement by the Scaling ( CES ) , the algorithm to achieve a simple and enhance at the same time to maintain a good image color , but mapping algorithm function when processing a whole dark and low- contrast images , the effect is not obvious. This article proposes a new method, without using the mapping function, but the DC coefficient of each block consisting of the DC image histogram equalization, and be able to handle a darker overall , and low contrast of the image , to improve the reinforcing effect . Enhanced color image in the block DCT domain block effect , this paper will present a simple average contiguous block of enhanced factor for ways to improve the blockiness .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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