Enhancement Method of JPEG2000 Compression Image Based on Retinex Theory
| Autor: | 储昭辉 Chu Zhao-hui, 张新龙 Zhang Xin-long, 汪荣贵 Wang Rong-gui, 张璇 Zhang Xuan |
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| Rok vydání: | 2012 |
| Předmět: |
Shadow and highlight enhancement
Color constancy business.industry Dynamic range Computer science ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Wavelet transform computer.file_format Atomic and Molecular Physics and Optics Image (mathematics) JPEG 2000 Computer vision Artificial intelligence business computer Image restoration Image compression |
| Zdroj: | ACTA PHOTONICA SINICA. 41:200-204 |
| ISSN: | 1004-4213 |
| Popis: | In the process of enhancing the image compression,the traditional image enhancement method has some difficulties in the details recovery and generates blocky effect easily.A new method of JPEG2000 compressed image enhancement is proposed by applying the thory of Retinex into JPEG2000 compact frame.The dynamic range of scene illumination is adjusted through two low-frequency coefficients non-linear mapping with the low frequency coefficients as the wavelet transform and the high-frequency coefficients as the reflected light.By adjusting the high frequency coefficient,image contrast is enhanced,so that the image detail is trended overall.Then illumination quantity table is modifyed and more details is retained and block effect is controled through judging activities of each sub-block and adaptive quantization.The experimental results show that this algorithm performed well in the reinforcing effect and the compressed quality,etc. |
| Databáze: | OpenAIRE |
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