多子直方图均衡微光图像增强及FPGA实现

陈莹; 朱明

doi:10.3788/CO.20140702.0225

Volume 7 Issue 2

Mar. 2014

Turn off MathJax

Article Contents

Chinese Optics > 2014 > 7(2): 225-233.

CHEN Ying, ZHU Ming. Multiple sub-histogram equalization low light level image enhancement and realization on FPGA[J]. Chinese Optics, 2014, 7(2): 225-233. doi: 10.3788/CO.20140702.0225

Citation:

CHEN Ying, ZHU Ming. Multiple sub-histogram equalization low light level image enhancement and realization on FPGA[J]. Chinese Optics, 2014, 7(2): 225-233. doi: 10.3788/CO.20140702.0225

CHEN Ying, ZHU Ming. Multiple sub-histogram equalization low light level image enhancement and realization on FPGA[J]. Chinese Optics, 2014, 7(2): 225-233. doi: 10.3788/CO.20140702.0225

Citation:

CHEN Ying, ZHU Ming. Multiple sub-histogram equalization low light level image enhancement and realization on FPGA[J]. Chinese Optics, 2014, 7(2): 225-233. doi: 10.3788/CO.20140702.0225

PDF( 1745 KB)

Multiple sub-histogram equalization low light level image enhancement and realization on FPGA

doi: 10.3788/CO.20140702.0225

CHEN Ying^1,2,
ZHU Ming^{1
,
,}

1.
Key Laboratory of Airborne Optical Imaging and Measurement, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 10 Nov 2013
Rev Recd Date: 08 Feb 2014
Publish Date: 25 Mar 2014

Abstract

Abstract

In order to solve the problems that low light level image has low contrast and it is difficult to distinguish objective, it is necessary to research on low light level image enhancement algorithm. A multiple sub-histogram equalization enhancement algorithm is proposed. Initially, in the proposed algorithm, the histogram are separated into four parts according to the area equally. Then, the resultant sub-histograms are clipped according to the average number of pixels of input image to reduce the enhancement phenomenon. In addition, the scale factor is adopted to adjust dynamic range. Finally, each sub-histogram is equalized. The algorithm is implemented on FPGA with verilog language, and is given subjective and objective evaluation. With this algorithm good results can be achieved in real-time on the hardware platform, and the delay of an image processing is about 0.45 ms. Experimental results show that with this proposed algorithm no saturation and noise amplification phenomenon appear, and image details of the processed image are well preserved and highlighted. The algorithm meets the real-time requirement and the enhanced images of better visual effect can be achieved.
- image enhancement,
- histogram equalization,
- low light level image,
- FPGA,
- real time

FullText(HTML)

References(1)

References

[1] 蔡式东, 杨芳. 基于直方图修正的图像增强算法[J]. 光电子技术, 2012, 32(3):155-159. CAI SH D, YANG F. Image enhancement based on histogram modification[J]. Optoelectronic Technology, 2012, 32(3):155-159.(in Chinese) [2] ABDULLAH-AL-WADUD M, HASANUL KABIR M, ALI AKBER DEWAN M, et al.. A dynamic histogram equalization for image contrast enhancement[J]. IEEE Transactions on Consumer Electronics, 2007, 53(2):593-601. [3] YANG F, WU J. An improved image contrast enhancement in multiple-peak images based on histogram equalization[J]. IEEE Conference Publications, 2010, 1:346-349. [4] CELIK T, TJAHJADI T. Automatic image equalization and contrast enhancement using gaussian mixture modeling[J]. IEEE Transactions on Image Processing, 2012, 21(1):145-156. [5] 范永杰, 张亚萍, 陈华. 平台直方图均衡算法实现的存储优化方法[J]. 激光与红外, 2013, 5:522-525. FAN Y J, ZHANG Y P, CHEN H. Realizing, memory optimization to plateau histogram[J]. Lasers and Infrared, 2013, 5:522-525.(in Chinese) [6] 吴成茂. 可调直方图均衡化的正则解释及其改进[J]. 电子学报, 2011, 39(6):1278-1284. WU CH M. Regularization explanation of adjustable histogram equalization and its improvement[J]. Acta Electronic Sinica, 2011, 39(6):1278-1284.(in Chinese) [7] 吴强, 王新赛, 贺明, 等. 一种结合小波分析与直方图的红外图像增强方法[J]. 应用光学, 2011, 32(3):464-467. WU Q, WANG X R, HE M, et al.. Infrared image enhancement based on wavelet analysis and histogram[J]. J. Appl. Optics, 2011, 32(3):464-467.(in Chinese) [8] 黄梅, 吴志勇, 梁敏华, 等. 暗背景下低灰度图像的实时增强[J]. 液晶与显示, 2011, 26(3):374-378. HUANG M, WU ZH Y, LIANG M H, et al.. Real-time enhancement method of low gray image under dark background[J]. Chinese J. Liquid Crystals and Displays, 2011, 26(3):374-378.(in Chinese) [9] WELLING P, KIM S H, CHO S B. Brightness preserving contrast enhancement using polynomial histogram amendment. IEEE Soc Design Conference, Jeju Island, Korea, 4-7 November, 2012. [10] CHEN H O, KONG N S P, IBRAHIM H. Bi-histogram equalization with a plateau limit for digital image enhancement[J]. IEEE Consumer Elevtronics, 2009, 55(4):2072-2087. [11] GAN C, YE Z. Brightness preserving histogram equalization with maximum entropy:a variational perspective[J]. IEEE Transactions on Consumer Electronics, 2005, 51(4):1326-1334. [12] 孙海江, 王延杰, 刘伟宁. 基于自适应平台阈值和拉普拉斯变换的红外图像增强[J]. 中国光学, 2011, 4(5):474-479. SUN H J, WANG Y J, LIU W N. Enhancement of infrared images based on adaptive platform threshold and laplace transformation[J]. Chinese Optics, 2011, 4(5):474-479.(in Chinese) [13] 王静轩, 尹传历. 基于DSP和FPGA的嵌入式实时图像增强系统[J]. 液晶与显示, 2013, 28(3):459-463. WANG J X, YIN CH L. Embedded color image enhancement system based on DSP and FPGA[J]. Chinese J. Liquid Crystals and Displays, 2013, 28(3):459-463.(in Chinese) [14] 吴家伟, 武春风, 庹文波. 红外图像实时显示增强系统设计[J]. 光学精密工程, 2009, 17(10):2612-2619. WU J W, WU CH F, YU W B. Design of real-time infrared image enhancement system[J]. Opt. Precision Eng., 2009, 17(10):2612-2619.(in Chinese) [15] 李强, 龚俊亮. 基于FPGA的实时红外图像采集与预处理系统[J]. 红外, 2012, 33(10):21-24. LI Q, GONG J L. Design of real-time infrared image acquisition and pre-process system based on FPGA[J]. Infrared, 2012, 33(10):21-24.(in Chinese) [16] 姜文涛, 陈卫东, 钱钧, 等. 基于FPGA的实时图像增强设计[J]. 应用光学, 2010, 31(6):965-968. JIANG W T, CHEN W D, QIAN J, et al.. Real-time image enhancement based on FPGA[J]. J. Appl. Optics, 2010, 31(6):965-968.(in Chinese) [17] 韩希珍, 赵建. 结合偏微分方程增强图像纹理及对比度[J]. 光学精密工程, 2012, 20(6):1382-1388. HAN X ZH, ZHAO J. Enhancement of image texture and contrast combined with partial differential equation[J]. Opt. Precision Eng., 2012, 20(6):1382-1388.(in Chinese) [18] 张超, 李洪文, 贾建禄, 等. 高帧频多通道图像采集与显示[J]. 液晶与显示, 2013, 28(4):593-597. ZHANG CH, LI H W, JIA J L, et al.. High frame rate and multiple channels digital image acquisition and display[J]. Chinese J. Liquid Crystals and Displays, 2013, 28(4):593-597.(in Chinese) [19] 贺柏根, 刘剑, 马天玮. 基于DSP+FPGA的实时图像去雾增强系统设计[J]. 液晶与显示, 2013, 28(6):968-972. HE B G, LIU J, MA T W. Real-time image defogging and enhanced system designed based on DSP+FPGA[J]. Chinese J. Liquid Crystals and Displays, 2013, 28(6):968-972.(in Chinese) [20] 尹传历, 王啸哲. 机载嵌入式图像增强系统设计与实现[J]. 液晶与显示, 2013, 28(4):604-607. YIN CH L, WANG X ZH. Design and realization of airborne embedded image enhancement system[J]. Chinese J. Liquid Crystals and Displays, 2013, 28(4):604-607.(in Chinese) [21] 孙玉胜, 白克. 基于小波变换与加权滤波的电机红外图像增强[J]. 液晶与显示, 2010, 25(3):439-443. SUN Y SH, BAI K. Enhancement of motor infrared image based on wavelet transform and weighted filtering[J]. Chinese J. Liquid Crystals and Displays, 2010, 25(3):439-443.(in Chinese)

Relative Articles

Supplements(0)

Cited By

Proportional views