Before HDR signals can be displayed on traditional TVs and monitors, tone mapping is required to compress the luminance and color range to the display device's displayable low dynamic range (LDR). However, there is a common problem of loss of image details after tone mapping of HDR signals, which affects video/image quality. To solve this problem, we proposes an enhanced tone mapping (ETM) with guided filter. In the constructed enhance channel, guided filtering is used to extract and reconstruct the image detail layer, which accurately preserves the image detail and removes the halo problem. which improves local dynamic contrast, enhances image details, and improves image clarity.
Images or videos displayed in TV usually have undesirable contrast, due to different imaging environments or imaging devices. There are numerous contrast adjustment methods in TV picture quality improvement solutions. However, most of these methods produce undesirable enhancement results. In order to deal with this problem, a contrast enhancement method is proposed to dynamically improve picture quality for TV display. This method uses histogram distribution and APL (Average Pixel Level) of the considered image to compute the corresponding adjust curve. Then the obtained mapping curve is applied to the whole image for improving contrast. The proposed method has been applied on a smart TV. Results demonstrate this method has good performance in terms of enhancing image contrast and maintaining image naturalness.
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