LDR to HDR Conversion Based On Spatial And Intensity Correlation
| Autor: | Ya-Fan Liu, 劉亞帆 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 Nowadays, the quality of life has been promoted.People expect the display images to be close to the real scene.In the nature scenes, the dynamic range is broader, but it is limited in the images and cannot be displayed perfectly due to the storage format.In the previous studies, researchers develop the equipment to capture images by using different exposure time at same area and combined them to a high dynamic range image (HDRI).Although the result is good, the dynamic object and environment may cause inconsistent results.In recent years, many researchers want to get good HDR results easily and conveniently.In this thesis we present a new method for generating HDRI.We transform an input image into HSI color space, separating the color and intensity information, and process the intensity channel.Then the dynamic range of intensity is extended from 8 bits to 10 bits and a Butterworth Filter is applied to the histogram which is set as the target histogram to generate a new image allocation.In the new image allocation, we consider image pixel distance and intensity value correlation and use connected-component to set the pixel value.Cumulative Distribution Function Curve of the histogram extends a fixed distance in each round and generates a new histogram which set as a target histogram.Finally,the image is combined with the color information and an inverse tone mapping operator is used to extend the LDR to HDR range. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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