Effect of Direct Statistical Contrast Enhancement Technique on Document Image Binarization  

作　　者：Wan Azani Mustafa Haniza Yazid Ahmed Alkhayyat Mohd Aminudin Jamlos Hasliza A.Rahim 

机构地区：[1]Advanced Computing(AdvCOMP),Centre of Excellence,Universiti Malaysia Perlis(UniMAP),Pauh Putra Campus,Arau,02600,Perlis,Malaysia [2]Faculty of Electrical Engineering Technology,Universiti Malaysia Perlis(UniMAP),Pauh Putra Campus,Arau,02600,Perlis,Malaysia [3]Faculty of Electronic Engineering Technology,Universiti Malaysia Perlis(UniMAP),Pauh Putra Campus,Arau,02600,Perlis,Malaysia [4]Faculty of Engineering,The Islamic University,Najaf,54001,Iraq

出　　处：《Computers, Materials & Continua》2022年第2期3549-3564,共16页计算机、材料和连续体（英文）

摘　　要：Background:Contrast enhancement plays an important role in the image processing field.Contrast correction has performed an adjustment on the darkness or brightness of the input image and increases the quality of the image.Objective:This paper proposed a novel method based on statistical data from the local mean and local standard deviation.Method:The proposed method modifies the mean and standard deviation of a neighbourhood at each pixel and divides it into three categories:background,foreground,and problematic(contrast&luminosity)region.Experimental results from both visual and objective aspects show that the proposed method can normalize the contrast variation problem effectively compared to Histogram Equalization(HE),Difference of Gaussian(DoG),and Butterworth Homomorphic Filtering(BHF).Seven(7)types of binarization methods were tested on the corrected image and produced a positive and impressive result.Result:Finally,a comparison in terms of Signal Noise Ratio(SNR),Misclassification Error(ME),F-measure,Peak Signal Noise Ratio(PSNR),Misclassification Penalty Metric(MPM),and Accuracy was calculated.Each binarization method shows an incremented result after applying it onto the corrected image compared to the original image.The SNR result of our proposed image is 9.350 higher than the three(3)other methods.The average increment after five(5)types of evaluation are:(Otsu=41.64%,Local Adaptive=7.05%,Niblack=30.28%,Bernsen=25%,Bradley=3.54%,Nick=1.59%,Gradient-Based=14.6%).Conclusion:The results presented in this paper effectively solve the contrast problem and finally produce better quality images.

关 键 词：BINARIZATION CONTRAST LUMINOSITY ILLUMINATION document image 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]