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IRJET- Visual Improvement of Histopathology Images using Enhancement Techniques
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 2017 Visual Improvement of Histopathology Images using Enhancement Techniques Dr.S.Anand1, G.Sangeethapriya2 1Associate Professor, Department of Electronics and Communication Engineering, 2PG Scholar, Department of Electronics and Communication Engineering, 1-2 Mepco Schlenk Engineering College, Sivakasi. ----------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Quality histopathology images (HPI) is essential for diagnosing the diseases and it is not easy for the experts to analyze low contrast or too bright HPI due to poor representation. Histopathology images are usually degraded by improper staining process and thus low contrast, poor illumination and low visibility images. The Problem of visualization and color variation in histopathology images jointly caused by inconsistentbiopsystainingand nonstandard imaging condition. In, order to overcome these limitations to build two stage adaptive histogram equalization for enhancement of histopathology images. The algorithm tested on different HPI images and compared with conventional contrast enhancement technique. Performance of proposed method is evaluated using Entropy, EME, SSIM and AMBE. Proposed method gives better results compared to contrast limited adaptive histogram equalization (CLAHE). Key Words: Image Enhancement, Histopathology Images, Adaptive Histogram Equalization, Performance Measures 1. INTRODUCTION Image enhancement is to enhance quality of the image. So, that visual appearance can be improved. If the Contrast of a medical image is mainly focused on particular range, e.g. low contrast image; the details are possibly misplaced in those places which are excessively and intensive. Histopathology is a branch of pathology which deals with microscopic examination biological tissues to observe the appearance of diseased cells and tissues in very fine details. Mostly these kinds of images are called microscopic images. Analysis of a histopathological images are conducted under the microscope, it will examinesthesampleforindicationsof diseases. Microscope offers even more benefits on studying pathogens that cause tissue changes or damage, as it allows them to see the level of tissue degradation present and therefore, verify the progression of the particular diseases. Discipline is absolutely vital to the understanding and detection of diseases, which ultimately broadens and progresses treatment options in the majority of instances. . Now days medical image processing is playing important role in our life, such as histopathology, mammogram images surgeries. Enhancement becomes necessary process for clinical research and diagnosis of cancer. It is the process of improving quality of image without any information loss. Main use of histopathology is clinical medicine (which is a term refers to the diagnosing, trying to treat and advise a patient) where it is typically involves the examination of biopsy samples. Importance of histopathology is accurate diagnosis of cancer and other diseases usually require histopathological examination of samples. Enhancement is necessary for diagnosing medical images to improve the visibility. Sharpening in medical images is a classic defeat in the area of image enhancement. Resolving low contrast structures is most common task performed by those interpreting medical images [1]-[5]. The construction of proposed work is based on two stagehistogramequalization (TSAHE). Role of two stage adaptive histogram equalization processing is important in image enhancement. It will effective method to enhancing contrast of a medical imageis becomes uniform [6]-[7]. Histopathological images are analyzed by using computerizedalgorithmssuchasmachine learning techniques. Algorithm has beendevelopedtodetect and diagnosing the diseases [8].Histogram equalizationmay results in large differences of the image and that of the enhanced one. Moreover, it leads to over enhancement and produce artifacts and edge effects [9]. Classical HE (CHE) is not accepted in real time applications since it does not preserve the brightness and naturalness of the image. To overcome this drawback, the variations of CHE should be considered. Technique of decomposing the input image into sub-image is known as Bi-HE (BHE). BHE method performs the image enhancement preserving brightness to some extend but the output image does not look as natural as the input ones [10]. If an image is poorly illuminated or if it is blurred, the details are misplaced or inconvenienttoextract. The foremost difficult is to enhance the illumination and intensity of an image without loss of information. Different techniques exist in order to defeat this issue [11]-[12], such as general histogram equalization(GHE)andlocal histogram equalization (LHE) for illumination enhancement. This kind of problems are occurs in conventional image enhancement technique and it can be overcome by color image enhancement techniques. If Hue gets changed, then original color of the image gets changed thereby distortingtheimage [13]. For color image enhancement, it is necessary that hue value should not get changed any pixel [14]. Kuang-TsuShih et al., [15] has focused on color image enhancement. Here, gamut mapping algorithm is proposed. In this current approach, ahead the uniform distribution matchasstandard AHE, further histogram distribution used to current more hidden internal structure. This will efficacious to facilitate
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 2018 the uniform distribution matching by providing more contrast information. Fig -1: Shows that example of H&E and IHC Stained Images Histopathological images areprocessedbyseveralwayssuch as Fixation, dehydration, Cleaning, Embedding, Cutting and Staining. Staining is used to highlight important features of the tissue as well as to enhance the tissue contrast. The tissues are stained with one or more stains for better visualization under the microscope. Histopathological images are mostly used in H&E (HaemotoxylinandEosin)andIHC(Immunehistochemistry) staining. Eosin dye is a negatively charged acidic color. It is a pink, orange and red color stain.H&Eusedfordemonstration of nucleus (blue, purple) and cytoplasm (pink, orange) inclusions in clinical specimens. Haemotoxylin is a dark blue or violet that is positive dye. These types staining method is used to gives a general overview structureof the tissueandit can be used to better diagnosistool.ImmuneHistoChemistry (IHC) is a type of staining. This type of staining is used to diagnose the abnormal cells suchasthosefoundincancerous tumors. Histopathology image is also widely used in basic research to understand the distribution and localization of bio-marks anddifferentiallyexpressedproteinsindifferent parts of a biological tissue. Figure 1 shows that examples of H&E and IHC stained image. H&E staining image is accommodate from UCSB dataset of a benign stage. The histopathologicalimagesareacquiredthroughdigitalcamera through a light microscopy with a different magnification such as 10×, 20× and 40×. 3. Proposed Work ThisproposedalgorithmpresentedaHistopathologicalimage enhancement using two stage adaptive histogram equalization (TSAHE). Histogram is the basis for numerous spatial domain image processing techniques. In specific, the role of histogram equalization is important in image enhancement. It is sensible to conclude that histopathology images, whose assigns intensity values of pixels in the input image such that the output image contains a uniform distribution of intensities. Let P is the input image and Q is the histogram equalized image. The objective of this algorithm is to initiatean enhancedimage,whichhasprovide a better visual quality compared to original image P. This algorithm enhances thecontrastofanimagebasedonAHEby mapping the pixel values in such a way that the histogram of the resulting image becomes uniform. Image Enhanced Image Fig -2: Proposed Two Stage Adaptive Histogram (TSAHE) Equalization Flat and bell shaped histogram are used to achieve a desired histogram from an image tiles. Flat specification which indicates that exactly the same thing is happening over and over again. Bell shaped specification usually represents a normal distribution. This type specification usually appears to have one cluster that much of data cluster around. In Principle, there are two stages in our proposed AHE approach (i.e.) two consecutive stages with desired histograms. The proposed method is improved and Evidenced from the color information of original, AHE and proposed TSAHE. More specifically proposed method gives better results compared to standard adaptive histogram equalization (AHE). 4. Experimental Results and Discussions The proposed method is tested on all histopathological images from UCSB and pathpedia database [8]. In order to prove its qualitative efficiency, three of the results are presented in Fig. 3. First column of Fig. 3 refers the original, second column refers to the output of contrast limited AHE (CLAHE) and third column refers to the output proposed TSAHE method. From the presented results it is easily observed that our method TSAHE enhances the contrast of the histopathology image in better way than CLAHE. The enhancement results are evaluated using Entropy, Measure of Enhancement (EME). Entropy The image enhancement is based on information content of an Image. Larger entropy value the image has, the higher information contained in the output image. The entropy for the whole image can be defined by, H(K)= 255 0i pi log2 pi Where, pi is the probability of intensity I at pixel in enhanced Image. Measure of Enhancement (EME) Measure the values at given pixel for enhanced image should be depend on the pixel. HE With Flat Shaped Specification HE with Bell Shaped Specification 2. Staining of Histopathology Slides
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 2019 EME= Where the image (I) spilt into K1, K2 blocks, I l,m max and I l,m min maximum and minimum values of pixels in every block of the enhanced image. Table -1: Performance Comparison Proposed and Other Enhancement Methods Parameter original HE AHE CLAHE TSAHE Entropy 6.6903 5.7886 7.4803 7.1561 7.8795 EME 11.6324 38.3928 25.9243 21.7027 40.8261 These parameters are evaluated for 10 images in UCSB and Pathpedia database and the average is tabulated in table 1.Proposed techniques (TASHE) gives better results compared to other than methods and analyze the performancequalitatively.TheproposedTASHElowcontrast enhancement scheme gives high measure of enhancement values and also retains the entropy values from existing methods. Images Original Image AHE Image TAHSE Image I1 I2 I3 I4 Fig. 3. Enhancement results comparison: column 1: original, column 2: CLAHE, column 3: proposed method TSAHE.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 2020 Proposed techniques(TASHE) gives better resultscompared to other than methods and analyze the performance qualitatively. The proposed TASHE low contrast enhancement scheme gives high measure of enhancement values and also retains the entropy values from existing methods. Histopathological image enhancement algorithm for restoring the visibility and color contrast appearance of histopathology images with less computational complexity. The novelty of the proposed method is that color image enhancement is based on TSAHE which is a new way to integrate color and brightness information extracted from color image enhancement. The proposed technique offers good performance in terms of better contrast verified by improved Measure of enhancement (EME) and the information content in the image is verified by comparing entropy values of original imageandenhancedoutputimage. The experimental results were illustrating the superiority of the proposed scheme over the other methods. [1] Anand S and Gokula Janani., “Analysis of Enhancement Algorithms for Non-uniform Illumination Images,” International journal of Applied Engineering Research, vol. 10, pp. 378-383, 2015. [2] Anand S, ShanthaSelvaKumari R, and Thivya T., “Sharpening enhancement of ultrasound images using contourlet transform,” Optik - International Journal for Light and Electron Optics,vol.124,pp.4789-4792,2013. [3] Anand S and ShanthaSelvaKumari R., "Sharpening enhancement of Computed Tomography (CT) images using Hyperbolic Secant Square filter," Optik - International Journal for Light and Electron Optics, vol. 124, pp. 2121-2124, 2013. [4] Anand S, ShanthaSelvaKumari R, Jeeva, Thivya "Directionlet transform based sharpening and enhancement of mammographic X-ray images,” Biomedical signal Processing and Control, vol. 8, pp. 391-399, 2013. [5] Anand S, ShanthaSelvaKumari R, Jeeva, Thivya., "Contourlet Transform based SharpeningEnhancement of Retinal Images and Vessal Extraction Application," International Journal on Biomedical Engineering(BMT), vol. 58, pp. 87-96, 2013. [6] Murugachandravel J and Anand S., “Wavelet Based Image Enhancement using Two Stage Adaptive Histogram Equalization," International Journal of Pure and Applied Mathematics vol. 118, pp. 539-542, 2018. [7] Anand S and Gayathri., "Mammogram image enhancement by two-stage adaptive histogram equalization" Optik - International Journal for Light and Electron Optics, vol. 126, pp. 3150-3152, 2015. [8] Jain K, "Fundamentals of Digital Image Processing", Englewood Cliffs, NJ: Prentice-Hall, 1991. [9] Gurcan M. N. and Bulent Yener., “Histopathological Image Analysis: A review,” IEEE reviews on Biomedical Engineering, vol. 2, pp.147-141, 2009 [10] Kim Y. T., “Contrast Enhancement using Brightness preserving Bi-Histogram equalization,” IEEE Trans. On Consumer Electronics, vol. 43, no. 1, pp. 1-8, 1997. [11] Weeks A. R. and Sartor L. J., “Histogram specification of 24 bit color images in the color difference (cy) color space,” journal of electronic imaging, vol. 8, no. 3, pp. 290-300, 1999. [12] Tian Y. and Tan. “Do singular values contains adequate information for face recognition,” pattern recognition, vol. 36, no. 3, pp. 649-655, 2003. [13] Ibrahim H., and Kong “Brightness Protecting Dynamic Histogram Equalization for Image Enhancement,” IEEE Transactions on Consumer Electronics,Vol.53,no.4,pp. 1752-1758, 2007. [14] Ledley R. S. and Buas M., “Fundamentals of true color image processing,” Proc. 10th IEEE Conf. on pattern recognition, Los Alamos, CA, USA, 1990. [15] Kuang-Tsu Shih and Homer H. Chen., “Exploiting Perceptual Anchoring for color image enhancement.” IEEE Transactions on Multimedia, vol. 18, no.2,pp.300- 310, 2015. Conclusion References
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