| Summary: | 碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 104 === With the rapid advance of technology, the demands of consumers for quality of image are increasing. It is important that images preserve scenes close to human eyes. In addition, the current image sensor and display device cannot preserve the whole dynamic range of the real scene completely. Therefore, in the application of image technique in different field, the image techniques with both higher dynamic range and image quality are prospering.
High dynamic range image techniques can be roughly classified into two categories: single image enhancement and merging different exposure images. These two categories of methods are improved respectively. The method merging the advantages of these two different categories of methods is seldom to be discussed. Ergo, this thesis proposes a new method combining these two kinds of methods. It can not only preserve details in the extreme high luminance region of real scene but also enhance the contrast of the area under normal brightness.
In order to display the image contents on common devices, it is necessary to compress the high dynamic range image into low dynamic range one. Therefore, this thesis proposes a mapping function merging the advantages of global and local tone mapping. It is effective to compress the HDR image to lower dynamic range for common displays and preserve details in the scene. The thesis uses camera array being composed of Logitech webcams to capture input images. The system is implemented on platform called Adlink MXC-6300 and reaches 20 frames per second processing speed for VGA video.
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