Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation
Noise estimation for image sensor is a key technique in many image pre-processing applications such as blind de-noising. The existing noise estimation methods for additive white Gaussian noise (AWGN) and Poisson-Gaussian noise (PGN) may underestimate or overestimate the noise level in the situation...
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MDPI AG
2019-01-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/19/2/339 |
| _version_ | 1811304563757547520 |
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| author | Yongsong Li Zhengzhou Li Kai Wei Weiqi Xiong Jiangpeng Yu Bo Qi |
| author_facet | Yongsong Li Zhengzhou Li Kai Wei Weiqi Xiong Jiangpeng Yu Bo Qi |
| author_sort | Yongsong Li |
| collection | DOAJ |
| description | Noise estimation for image sensor is a key technique in many image pre-processing applications such as blind de-noising. The existing noise estimation methods for additive white Gaussian noise (AWGN) and Poisson-Gaussian noise (PGN) may underestimate or overestimate the noise level in the situation of a heavy textured scene image. To cope with this problem, a novel homogenous block-based noise estimation method is proposed to calculate these noises in this paper. Initially, the noisy image is transformed into the map of local gray statistic entropy (LGSE), and the weakly textured image blocks can be selected with several biggest LGSE values in a descending order. Then, the Haar wavelet-based local median absolute deviation (HLMAD) is presented to compute the local variance of these selected homogenous blocks. After that, the noise parameters can be estimated accurately by applying the maximum likelihood estimation (MLE) to analyze the local mean and variance of selected blocks. Extensive experiments on synthesized noised images are induced and the experimental results show that the proposed method could not only more accurately estimate the noise of various scene images with different noise levels than the compared state-of-the-art methods, but also promote the performance of the blind de-noising algorithm. |
| first_indexed | 2024-04-13T08:09:23Z |
| format | Article |
| id | doaj.art-c640737f43194c6fbf0c37408773f000 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T08:09:23Z |
| publishDate | 2019-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-c640737f43194c6fbf0c37408773f0002022-12-22T02:55:03ZengMDPI AGSensors1424-82202019-01-0119233910.3390/s19020339s19020339Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute DeviationYongsong Li0Zhengzhou Li1Kai Wei2Weiqi Xiong3Jiangpeng Yu4Bo Qi5School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaKey Laboratory of Beam Control, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, ChinaNoise estimation for image sensor is a key technique in many image pre-processing applications such as blind de-noising. The existing noise estimation methods for additive white Gaussian noise (AWGN) and Poisson-Gaussian noise (PGN) may underestimate or overestimate the noise level in the situation of a heavy textured scene image. To cope with this problem, a novel homogenous block-based noise estimation method is proposed to calculate these noises in this paper. Initially, the noisy image is transformed into the map of local gray statistic entropy (LGSE), and the weakly textured image blocks can be selected with several biggest LGSE values in a descending order. Then, the Haar wavelet-based local median absolute deviation (HLMAD) is presented to compute the local variance of these selected homogenous blocks. After that, the noise parameters can be estimated accurately by applying the maximum likelihood estimation (MLE) to analyze the local mean and variance of selected blocks. Extensive experiments on synthesized noised images are induced and the experimental results show that the proposed method could not only more accurately estimate the noise of various scene images with different noise levels than the compared state-of-the-art methods, but also promote the performance of the blind de-noising algorithm.http://www.mdpi.com/1424-8220/19/2/339noise estimationadditive white Gaussian noisePoisson-Gaussian noiselocal gray statistic entropylocal median absolute deviationimage sensor |
| spellingShingle | Yongsong Li Zhengzhou Li Kai Wei Weiqi Xiong Jiangpeng Yu Bo Qi Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation Sensors noise estimation additive white Gaussian noise Poisson-Gaussian noise local gray statistic entropy local median absolute deviation image sensor |
| title | Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation |
| title_full | Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation |
| title_fullStr | Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation |
| title_full_unstemmed | Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation |
| title_short | Noise Estimation for Image Sensor Based on Local Entropy and Median Absolute Deviation |
| title_sort | noise estimation for image sensor based on local entropy and median absolute deviation |
| topic | noise estimation additive white Gaussian noise Poisson-Gaussian noise local gray statistic entropy local median absolute deviation image sensor |
| url | http://www.mdpi.com/1424-8220/19/2/339 |
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