An automatic exposure method of plane array remote sensing image based on two-dimensional entropy
文献类型：期刊论文
| 作者 | T. Gao; L. Zheng; W. Xu; Y. Piao; R. Feng; X. Chen and T. Zhou |
| 刊名 | Sensors
 |
| 出版日期 | 2021 |
| 卷号 | 21期号:10 |
| ISSN号 | 14248220 |
| DOI | 10.3390/s21103306 |
| 英文摘要 | The improper setting of exposure time for the space camera will cause serious image quality degradation (overexposure or underexposure) in the imaging process. In order to solve the problem of insufficient utilization of the cameras dynamic range to obtain high-quality original images, an automatic exposure method for plane array remote sensing images based on two-dimensional entropy is proposed. First, a two-dimensional entropy-based image exposure quality evaluation model is proposed. The two-dimensional entropy matrix of the image is partitioned to distinguish the saturated areas (region of overexposure and underexposure) and the unsaturated areas (region of propitious exposure) from the original image. The ratio of the saturated area is used as an evaluating indicator of image exposure quality, which is more sensitive to the brightness, edges, information volume, and signal-to-noise ratio of the image. Then, the cubic spline interpolation method is applied to fit the exposure quality curve to efficiently improve the cameras exposure accuracy. A series of experiments have been carried out for different targets in different environments using the existing imaging system to verify the superiority and robustness of the proposed method. Compared with the conventional automatic exposure method, the signal-to-noise ratio of the image obtained by the proposed algorithm is increased by at least 1.6730 dB, and the number of saturated pixels is reduced to at least 2.568%. The method is significant to improve the on-orbit autonomous operating capability and on-orbit application efficiency of space camera. 2020 by the authors. Licensee MDPI, Basel, Switzerland. |
| URL标识 | 查看原文 |
| 源URL | [http://ir.ciomp.ac.cn/handle/181722/65069]  |
| 专题 | 中国科学院长春光学精密机械与物理研究所 |
| 推荐引用方式 GB/T 7714 | T. Gao,L. Zheng,W. Xu,et al. An automatic exposure method of plane array remote sensing image based on two-dimensional entropy[J]. Sensors,2021,21(10). |
| APA | T. Gao,L. Zheng,W. Xu,Y. Piao,R. Feng,&X. Chen and T. Zhou.(2021).An automatic exposure method of plane array remote sensing image based on two-dimensional entropy.Sensors,21(10). |
| MLA | T. Gao,et al."An automatic exposure method of plane array remote sensing image based on two-dimensional entropy".Sensors 21.10(2021). |
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