In the state of the art,grayscale image enhancement algorithms are typically adopted for enhancement of RGB color images captured with low or non-uniform illumination.As these methods are applied to each RGB channel i...In the state of the art,grayscale image enhancement algorithms are typically adopted for enhancement of RGB color images captured with low or non-uniform illumination.As these methods are applied to each RGB channel independently,imbalanced inter-channel enhancements(color distortion)can often be observed in the resulting images.On the other hand,images with non-uniform illumination enhanced by the retinex algorithm are prone to artifacts such as local blurring,halos,and over-enhancement.To address these problems,an improved RGB color image enhancement method is proposed for images captured under nonuniform illumination or in poor visibility,based on weighted guided image filtering(WGIF).Unlike the conventional retinex algorithm and its variants,WGIF uses a surround function instead of a Gaussian filter to estimate the illumination component;it avoids local blurring and halo artifacts due to its anisotropy and adaptive local regularization.To limit color distortion,RGB images are first converted to HSI(hue,saturation,intensity)color space,where only the intensity channel is enhanced,before being converted back to RGB space by a linear color restoration algorithm.Experimental results show that the proposed method is effective for both RGB color and grayscale images captured under low exposure and non-uniform illumination,with better visual quality and objective evaluation scores than from comparator algorithms.It is also efficient due to use of a linear color restoration algorithm.展开更多
Obesity is a chronic,relapsing,multifactorial pandemic defined as the excessive or abnormal accu・mulation of body fat due to genetic,biological,microbial,and environmental factors that promote a positive energy balanc...Obesity is a chronic,relapsing,multifactorial pandemic defined as the excessive or abnormal accu・mulation of body fat due to genetic,biological,microbial,and environmental factors that promote a positive energy balance mainly associated with increased intake and reduced consumption.1-3 Obesity is the consequence of enormous multisystem disorders,in eluding cardiovascular disease,4 type 2 diabetes,5 tumors,&sleep apnea,7-10 etc.,significantly increases mortality rate,11-13 and accounts for substantial elevation in health expenditures.14 Compared with Western countries.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.2019YFB1405000)the National Natural Science Basic Research Plan Program of Shaanxi,China(Grant Nos.2019JM-162 and 2019JM-348).
文摘In the state of the art,grayscale image enhancement algorithms are typically adopted for enhancement of RGB color images captured with low or non-uniform illumination.As these methods are applied to each RGB channel independently,imbalanced inter-channel enhancements(color distortion)can often be observed in the resulting images.On the other hand,images with non-uniform illumination enhanced by the retinex algorithm are prone to artifacts such as local blurring,halos,and over-enhancement.To address these problems,an improved RGB color image enhancement method is proposed for images captured under nonuniform illumination or in poor visibility,based on weighted guided image filtering(WGIF).Unlike the conventional retinex algorithm and its variants,WGIF uses a surround function instead of a Gaussian filter to estimate the illumination component;it avoids local blurring and halo artifacts due to its anisotropy and adaptive local regularization.To limit color distortion,RGB images are first converted to HSI(hue,saturation,intensity)color space,where only the intensity channel is enhanced,before being converted back to RGB space by a linear color restoration algorithm.Experimental results show that the proposed method is effective for both RGB color and grayscale images captured under low exposure and non-uniform illumination,with better visual quality and objective evaluation scores than from comparator algorithms.It is also efficient due to use of a linear color restoration algorithm.
文摘Obesity is a chronic,relapsing,multifactorial pandemic defined as the excessive or abnormal accu・mulation of body fat due to genetic,biological,microbial,and environmental factors that promote a positive energy balance mainly associated with increased intake and reduced consumption.1-3 Obesity is the consequence of enormous multisystem disorders,in eluding cardiovascular disease,4 type 2 diabetes,5 tumors,&sleep apnea,7-10 etc.,significantly increases mortality rate,11-13 and accounts for substantial elevation in health expenditures.14 Compared with Western countries.
