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Author(s): |
Kuen-Jan He, Dept. of Electrical Engineering, Feng Chia University, FCU, Taichung
Kuan-Yu He, Dept. of Electrical Engineering, Feng Chia University, FCU, Taichung
Chen Lei Wang, Dept. of Electrical Engineering, Feng Chia University, FCU, Taichung |
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Abstract: |
Contrast enhancement is an important technology for improving the quality of video images. It has been extensively applied to various fields like medical image processing, object detection of dynamic images, visual inspection systems. According to human eye characteristics the intensity of luminance changes are more sensitive than color changes. For this reason high contrast images are clearer than low contrast images by the human eye’s ability. Because of the aforesaid, the contrast enhancement method based on image processing methods that drive system way has been selected as the target of this study. This paper proposes a contrast enhancement technique modified by previous study to keep the brightness of the enhanced image. The implementation of the modified version is also simplified. The proposed method is not only suitable for the requirement of video images, the adjustment for clear display made by viewers is also simplified for real world. In the hardware implementation, the proposed method can reach 43.9 MSPS(Sample per second) which is 3.25 times faster than the demand of SDTV NTSC 720*480i specification and 1.63 times faster than the demand of EDTV NTSC 720*480p specification.
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