Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Denoising is done to remove unwanted noise from image to analyze it in better form. Let imgToDenoiseIndex = 2 and temporalWindowSize = 3. Last Updated: 29 Nov 2022. html The the class documentation is here. Samples are provided on github here. This is one of the first steps to building a dynamic pricing model. If I read you correctly, noise removal is needed to find your psb contours to remove perspective distortion. (normally same as h), templateWindowSize : should be odd. Should teachers encourage good students to help weaker ones? Comparing Java enum members: == or equals()? OpenCV provides denoising algorithms. But in most cases, noise is not just subjected to the neighborhood. Ready to optimize your JavaScript with Rust? Sometimes in a small neighbourhood around it. ionic-framework To learn more, see our tips on writing great answers. Learn about Image Blurring, Sharpening and Noise Reduction in this Video. Load image, grayscale, then Otsu's threshold. Connect and share knowledge within a single location that is structured and easy to search. In that case, a total of temporalWindowSize frames are used where central frame is the frame to be denoised. Asking for help, clarification, or responding to other answers. How to remove periodic noise in the Fourier domain? In this Kmeans clustering machine learning project, you will perform topic modelling in order to group customer reviews based on recurring patterns. We might also be aware of various smoothing techniques such as Gaussian Smoothing, Median Smoothing, and so on. Rest is left for you. Irreducible representations of a product of two groups. What about using these similar patches together and find their average? regex Does illicit payments qualify as transaction costs? Not sure if it was just me or something she sent to the whole team. The the class documentation is here. mongoose typescript-generics How to remove an element from a list by index. In this machine learning pricing project, we implement a retail price optimization algorithm using regression trees. Save my name, email, and website in this browser for the next time I comment. Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition. (Noise is expected to be gaussian). Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Opening is erosion followed by dilation so when you erode the image with a big enough kernel size the white lines will dissapear: Now you have a white spot with some noises arround which you can connect by performing another dilation (cv2.dilate()): To make the ROI a bit smoother you can blur the image cv2.blur(): After that you can make another treshold and search for the biggest contour. But most of the time, we might not be readily having different frames of the same image. 10 is the ideal value, hForColorComponents: Same as h but for colored images. The former is used on grayscale images, while the latter is used on colored images. Ready to optimize your JavaScript with Rust? Green patches looks similar. Find centralized, trusted content and collaborate around the technologies you use most. add a comment 0 answered Jun 6 '17 lohachan0108 1 2 3 Step 2: Denoising using OpenCV Step 3: Displaying the Output Step 1: Import the libraries and read the image. Below are the initial steps to write Python OpenCV code: (1) Read the colored File in a varibale (2) Convert teh colored Image in to Grayscale Image so that mena filtering can be applied to the same (3) Define the size of sliding window in two variables. observable Let us consider a noisy pixel P = p + n where p is the pixel value, and n is the noise. I have already tried to use OpenCV with the following code: cv2.fastNlMeansDenoisingColored(image_sharp, None, 2, 10, 7, 20) However the image that is returned back to me appears the exact same: Does anyone have any suggestions? Not the answer you're looking for? 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(10 is ok), hForColorComponents : same as h, but for color images only. json If so the code below allows you to set the contours of a rectangle manually by clicking mouse on the 4 corners and immediately apply transform. Dual EU/US Citizen entered EU on US Passport. and in relation to these by those that remained on the skin, how to remove them? angular2-template Then write a piece of code to find the average of all the frames in the video (This should be too simple for you now ). The image that we are using here is the one shown below. Lastly, apply closing (dilation then erosion) on the image to close all the small holes inside the words. Please visit first link in additional resources for more details on these parameters. ios My input image has a gaussian noise of \(\sigma = 25\). You may use the OpenCV Library - 2.4.3 has a class you can use org.opencv.photo.Photo which provides the denoising methods as in the first link. I suggest you create a model from objects.You can use deep neural network for detection of objects regions.Then according to the output of dnn do probe segmentation by gallery pair sample. javascript Do non-Segwit nodes reject Segwit transactions with invalid signature? angular-test angular8 Assuming grayscale image, you can partially eliminate the noise like this: # thresholding thresh, thresh_img = cv.threshold (img, 128, 255, 0, cv.THRESH_BINARY) # erode the image to *enlarge* black blobs erode = cv.erode (thresh_img, cv.getStructuringElement (cv.MORPH_ELLIPSE, (3,3))) # fill in the black blobs that are not surrounded by white . Every component of your image have certain height and width. I have tried anisotropic diffusion filter, bilateral filter also to remove noise but i dont achieve the result as that of neat image. Well, that's an ugly image! $\begingroup$ @Emre: I like to implement an algorithm for low light noise reduction rather than using neat image every time. Refresh the page, check Medium 's site status, or find something interesting to read. Sorted by: 4. first of all remember that there is no single solution for all kind of noise and all kind of images. 1 Answer Sorted by: 3 Yes. first is using Otsu thresholding: ret,thresh_img = cv2.threshold (img, 0, 255, cv2.THRESH_BINARY_INV|cv2.THRESH_OTSU) this will try to guess a good threshold for the image being used. How do I generate random integers within a specific range in Java? image = cv2.imread('projectpro_noise_20.jpg',1) scoping jquery single-sign-on In earlier chapters, we have seen many image smoothing techniques like Gaussian Blurring, Median Blurring etc and they were good to some extent in removing small quantities of noise. How to remove the noise without destroying the main edge? webpack. (Noise is expected to be gaussian). See the example below: Below is a zoomed version of result. researchgate.net/post/How_can_I_remove_hair_from_skin_image. Recipe Objective: How to remove noise from images in OpenCV? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do I read / convert an InputStream into a String in Java? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. That being said, for the removing of background you could try the same code that you allready have for detection without hairs. Making statements based on opinion; back them up with references or personal experience. In this ML project, you will learn to build a Multi Touch Attribution Model in Python to identify the ROI of various marketing efforts and their impact on conversions or sales.. Consider a noisy pixel, \(p = p_0 + n\) where \(p_0\) is the true value of pixel and \(n\) is the noise in that pixel. Why is printing "B" dramatically slower than printing "#"? We will demonstrate 2 and 3 here. Not the answer you're looking for? The first argument is the list of noisy frames. Should I exit and re-enter EU with my EU passport or is it ok? angular2-routing Then blur the image to reduce the noise in the background. android You do not need converting original image into gray: www.learnopencv.com/homography-exampl. For example, you passed a list of 5 frames as input. image openCV: cannot detect small shapes using findContours. The final result: Thanks for contributing an answer to Stack Overflow! java Finding the original ODE using a solution. You can see reduction in noise. Does Java support default parameter values? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. My work as a freelance was used in a scientific paper, should I be included as an author? Unfortunately this simple method is not robust to camera and scene motions. ng-class Would like to stay longer than 90 days. In this Regression Project, you will learn how to build a piecewise and spline regression model from scratch in Python to predict the points scored by a sports team. Below image shows a zoomed version of the result we got: It takes considerable amount of time for computation. I am using openCV in Java Netbeans. Asking for help, clarification, or responding to other answers. Yes. Periodic noise can be reduced significantly via frequency domain filtering. I didn't understand how do I implement the github source code? Making statements based on opinion; back them up with references or personal experience. primeng nativescript-angular 53,267 Solution 1. angular7 In those techniques, we took a small neighbourhood around a pixel and did some operations like gaussian weighted average, median of the values etc to replace the central element. node.js In the result, first image is the original frame, second is the noisy one, third is the denoised image. Creating Local Server From Public Address Professional Gaming Can Build Career CSS Properties You Should Know The Psychology Price How Design for Printing Key Expect Future. Suppose we consider the same pixel from different frames (i.e., if we hold the camera still and capture a certain subject for a couple of seconds in a video, we might get different frames) of the same image and compute their average. image-processing Is it appropriate to ignore emails from a student asking obvious questions? next.js Central limit theorem replacing radical n with n. Does integrating PDOS give total charge of a system? overriding Assuming grayscale image, you can partially eliminate the noise like this: # thresholding thresh, thresh_img = cv.threshold(img, 128, 255, 0, cv.THRESH_BINARY) # erode the image to *enlarge* black blobs erode = cv.erode(thresh_img, cv.getStructuringElement(cv.MORPH_ELLIPSE, (3,3))) # fill in the black blobs that are not surrounded by white: _, filled, _, _ = cv.floodFill(erode, None, (0,0 . discord.js Step 1: Import the libraries and read the image. angular5 See the example below: import numpy as np import cv2 as cv from matplotlib import pyplot as plt img = cv.imread ( 'die.png') dst = cv.fastNlMeansDenoisingColored (img, None ,10,10,7,21) plt.subplot (121),plt.imshow (img) Let us take this recipe to understand what noise is and how to eliminate them in an image. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. python Try also to improve the binarization (e.g. docker Received a 'behavior reminder' from manager. Why was USB 1.0 incredibly slow even for its time? This method is Non-Local Means Denoising. You can take large number of same pixels (say \(N\)) from different images and computes their average. How do we know the true value of a parameter, in order to check estimator properties? This is quite a difficult task becasue the hair goes over your ROI (mole). I have the following image: I would like to remove some of the noise in this image. that being said i can think of two solution. Your email address will not be published. scripting angular-reactive-forms For that particular window, that is fine. rating Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. (Noise is expected to be gaussian). On this page we use a notch reject filter with an appropriate radius to completely enclose the noise spikes in the Fourier domain. Chance is large that the same patch may be somewhere else in the image. How do I remove noise in original image using opencv; How to remove bell curved shape from image using opencv; How can I remove these parallel lines noise on my image using opencv; How to remove background from a image pasted on camera input using python, opencv; Note the link no longer has preview so you will have to download the java html docs and look inside org/photo/Photo.html. QGIS Atlas print composer - Several raster in the same layout. nativescript But it is necessary to understand that in those techniques, we considered a small neighborhood kernel matrix around a pixel, found its Gaussian weighted average or median, and replaced that value in the center of the kernel matrix. As mentioned above it is used to remove noise from color images. That being said, for the removing of background you could try the same code that you allready have for detection without hairs. How to remove noise from Image in openCV Java, docs.opencv.org/doc/tutorials/introduction/desktop_java/. Share Improve this answer Follow edited May 28, 2020 at 12:18 David Salb In the United States, must state courts follow rulings by federal courts of appeals? What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? Eroding with subsequent dilation will distort the shape of your triangles. So before we begin with understanding how to denoise an image, let us first comprehend the basic property of noise. How do I concatenate two lists in Python? Then we can obtain P = p, which implies that n = 0. rev2022.12.11.43106. This method can be less fast than the other neighborhood functions like Gaussian and median smoothing, but this is way more effective than those functions! To learn more, see our tips on writing great answers. So idea is simple, we need a set of similar images to average out the noise. Let us display the results using matplotlib. In short, noise removal at a pixel was local to its neighbourhood. 7 is the ideal value. spring-boot Noise is a random variable with its mean as 0. Let's see an example. protractor Hello Friends, In this episode we are going to remove the noise from masked image so we can focus on our Region Of Interest(ROI) and ignore the all noise in . So we take a pixel, take small window around it, search for similar windows in the image, average all the windows and replace the pixel with the result we got. I have an image example in which I work in an attempt to highlight only the skin spot, but due to the large number of hairs, the algorithm is not effective. In this machine learning project you will work on creating a robust prediction model of Rossmann's daily sales using store, promotion, and competitor data. For the removal of hairs from mole I advise you to search for "removing of watermarks from image" and "deep neural networks" to maybe train a model to remove the hairs (note that this task will be quite difficult). After greying the image try applying equalize histogram to the image, this allows the area's in the image with lower contrast to gain a higher contrast. syntax-highlighting visual-studio-code Step 1: Import the libraries and read the image. Is there a higher analog of "category with all same side inverses is a groupoid"? In that case, we can consider similar areas within the same image using a 5 x 5 or 7 x 7 window and find their average. work on HSV or LAB color space, use several channels, combine the RGB channels) to get a cleaner result. typescript flexbox But if you look at the picture you will find out that the white lines are quite thin and you can remove it from the image by performing opening (cv2.morphologyEx) on the image. Remove noise in such a situation is not simple. jasmine Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Ideally, you should get \(p = p_0\) since mean of noise is zero. angular2-directives rxjs express If you want to remove the smallest components which are not required according to you then first perform connected component analysis on the image. Hold a static camera to a certain location for a couple of seconds. There are four functions in opencv which is used for denoising of different images. Remove noise from threshold image opencv python. Originally Answered: OpenCV - Remove small, unwanted dots/noise in an image? It should be odd. If you post the original image, you could get better ideas. As mentioned above it is used to remove noise from color images. In this deep learning project, you will build a convolutional neural network using MNIST dataset for handwritten digit recognition. OpenCV provides four variations of this technique. 3 Steps To Enhance Images Using OpenCV Noise Reduction in Python | by Behic Guven | Better Programming Sign In Get started 500 Apologies, but something went wrong on our end. How do I get a substring of a string in Python? Why would Henry want to close the breach? You can verify it yourself by a simple setup. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. noise = np.random.randn(*gray[1].shape)*10, # Denoise 3rd frame considering all the 5 frames. As mentioned above it is used to remove noise from color images. rest Was the ZX Spectrum used for number crunching? Also often there is only one noisy image available. OpenCV provides denoising algorithms. Loan Eligibility Prediction Project - Use SQL and Python to build a predictive model on GCP to determine whether an application requesting loan is eligible or not. bootstrap-4 How to remove noise from an image in opencv (see the input picture)? loopbackjs angular2-nativescript forms Mathematica cannot find square roots of some matrices? See an example image below: The blue patches in the image looks the similar. angular-cli 21 is the ideal value. mysql Method #1: Morphological operations + contour filtering. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. angular9 Find some tutorial and try it on your own. mongodb It refers to one of the major pre-processing steps. Filter and remove small noise. How do I delete a file or folder in Python? nestjs I have some pictures with lots of noises.Is there any source code for Opencv Java that reduces noise of an Image? Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? angular6 Second argument imgToDenoiseIndex specifies which frame we need to denoise, for that we pass the index of frame in our input list. r searchWindowSize: The window size of the search area. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? It takes more time compared to blurring techniques we saw earlier, but its result is very good. How to remove periodic noise in the Fourier domain? ngroute api I come from a background in Marketing and Analytics and when I developed an interest in Machine Learning algorithms, I did multiple in-class courses from reputed institutions though I got good Read More. The mathematics behind various methods will be also covered. nginx Can several CRTs be wired in parallel to one oscilloscope circuit? In this Machine Learning Project, you will build a classification model for default prediction with LightGBM. rev2022.12.11.43106. Is this an at-all realistic configuration for a DHC-2 Beaver? training-data arrays document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); amazon-web-services Periodic noise can be reduced significantly via frequency domain filtering. I don't know how to help remove it from the mole but I can help to remove the backround like in the picture without hairs. angularjs noiseless_image_bw = cv2.fastNlMeansDenoising(image_bw, None, 20, 7, 21) angular-material I want to achieve that in the output I will get white background and black text only. templateWindowSize: The window size of the template. How to remove hair from skin images using opencv? angular11 How can I remove a key from a Python dictionary? from matplotlib import pyplot as plt Below is a python implementation of @dhanushka's approach. This recipe helps you remove noise from images in OpenCV Next apply edge detection on the image, make sure that noise is sufficiently removed as ED is susceptible to it. Noise is generally considered to be a random variable with zero mean. The notch filter rejects frequencies in predefined neighborhoods around a center frequency. django-templates sass Then blur the image to reduce the noise in the background. For the removal of hairs from mole I advise you to search for "removing of watermarks from image" and "deep neural networks" to maybe train a model to remove the hairs (note that this task will be quite difficult). google-chrome Third is the temporalWindowSize which specifies the number of nearby frames to be used for denoising. You will get a binary image like this: Now your region is filled with white lines (hairs) that go over your contour that is your ROI and cv2.findContours() would also pick them out because they are connected. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The image that we are using here is the one shown below. angular-datatables 1 Eroding noisy borders of polygons in an image noiseless_image_colored = cv2.fastNlMeansDenoisingColored(image,None,20,20,7,21). Identifying the ROI on marketing campaigns is an essential KPI for any business. angular-ui-router nginx-reverse-proxy python image opencv image-processing. Should I exit and re-enter EU with my EU passport or is it ok? Better way to check if an element only exists in one array. Introduction to Java Development tells you how to use the opencv library : We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. What is wrong in this inner product proof? templating Syntax: cv2.fastNlMeansDenoisingColored ( P1, P2, float P3, float P4, int P5, int P6) Parameters: P1 - Source Image Array Required fields are marked *. You will learn about Non-local Means Denoising algorithm to remove noise in the image. 0 Converting blobs to circles 4 Vein extraction from this image 3 Easy way to get rid of noise in a hand drawing 2 Morphology - Why does the concept of opening and closing images exist when we already have erosion and dilation? How to upgrade all Python packages with pip? It is also to be noted that both templateWindowSize and searchWindowSize should always be odd. @Laurentui L. Why don't you try actually reading some documention? This will give you plenty of frames, or a lot of images of the same scene. That is when we need other methods to denoise the image. npm You may use the OpenCV Library - 2.4.3 has a class you can use org.opencv.photo.Photo which provides the denoising methods as in the first link. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How is Jesus God when he sits at the right hand of the true God? validation Explore Fascinating Image Processing Project Ideas With Source Code. Assuming grayscale image, you can partially eliminate the noise like this: The output is not clean (some dark blobs between the text lines, which can be further removed by thresholding the sizes of connected components), but this should be a good start: Answer Checked By Senaida (AngularFixing Volunteer), Your email address will not be published. This is the principle that drive the cv.fastNlMeansDenoising() and cv.fastNlMeansDenoisingColored() functions. How do I access environment variables in Python? Let us first import the necessary libraries and read the image. angular12 Why is there an extra peak in the Lomb-Scargle periodogram? There is a property of noise. opencv Image Processing Project Ideas With Source Code. Next apply edge detection on the image, make sure that noise is sufficiently removed as ED is susceptible to it. import cv2 When you get stuck, come back and ask your question following these guidelines: They are in Python Where can I find Java Source Code? Of course if you are sure that what you want to preserve is always triangles you can add an extra step to verify a triangular shape before erasing noise. Create a rectangular kernel with cv2.getStructuringElement () and then perform morphological operations to remove noise. angular Do I have to include that java file in my project? strongloop angular2-forms Algorithm used to highlight skin blemishes: How to deal with these noises to the point of improving my region of interest? Consider a small window (say 5x5 window) in the image. Why is processing a sorted array faster than processing an unsorted array? (recommended 7), searchWindowSize : should be odd. php Find centralized, trusted content and collaborate around the technologies you use most. angular-cdk angular10 How were sailing warships maneuvered in battle -- who coordinated the actions of all the sailors? See the example below: import numpy as np import cv2 as cv from matplotlib import pyplot as plt img = cv.imread ( 'die.png') dst = cv.fastNlMeansDenoisingColored (img, None ,10,10,7,21) plt.subplot (121),plt.imshow (img) c++ image_bw = cv2.imread('projectpro_noise_20.jpg',0). We already know why eliminating noise is essential in an image. The function medialBlur () is used to remove the noise from the given image. c# css More details and online demo can be found at first link in additional resources. I suggest to clean up the original (RGB) image, it's much easier than the binary image. angularjs-e2e (recommended 21). Thanks for contributing an answer to Stack Overflow! The image whose noise must be removed is read using imread () function. jestjs Add a new light switch in line with another switch? unit-testing Compare the final result and first frame. Remove text contours. django You can use connected components (CC) or even better a floodFill and remove (fill with zeros) based on the area (floodFill outputs the area of every CC it finds). So isn't a free-code place. karma-jasmine How to remove image noise using opencv - python? reactjs angular-material2 Any disadvantages of saddle valve for appliance water line? Recipe Objective: How to remove noise from images in OpenCV? svg In my opinion, DullRazon, who does these removals, but found no implementation of it. Connect and share knowledge within a single location that is structured and easy to search. h : parameter deciding filter strength. twitter-bootstrap Let us first import the necessary libraries and read the image. Let us jump into the code now. How do I create a Java string from the contents of a file? react-native Dual EU/US Citizen entered EU on US Passport. In this project you will use Python to implement various machine learning methods( RNN, LSTM, GRU) for fake news classification. import cv2 import numpy as np # load color image im = cv2.imread('input.jpg') # smooth the image with alternative closing and opening # with an enlarging kernel morph = im.copy . Higher h value removes noise better, but removes details of image also. The image variable stores the image in BGR format, while the image_bw stores the image in Grayscale format. The notch filter rejects frequencies in predefined neighborhoods around a center frequency. Obtain binary image. range vue.js I am working with skin images, in recognition of skin blemishes, and due to the presence of noises, mainly by the presence of hairs, this work becomes more complicated. For color images, image is converted to CIELAB colorspace and then it separately denoise L and AB components. You can find 4 variations presented here. Then frame-1, frame-2 and frame-3 are used to denoise frame-2. Why do we use perturbative series if they don't converge? With this, I would like you to help me develop an algorithm to remove or reduce the amount of hair so that I can only highlight my area of interest (ROI), which are the spots. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. See the result: Now we will apply the same method to a video. Many doubts regarding. You can find 4 variations presented here. firebase In this AWS MLOps project, you will learn how to deploy a classification model using Flask on AWS. import numpy as np In order to remove random variations in the pixel values of the given image or the noise, we make use of the median filter in OpenCV. On this page we use a notch reject filter with an appropriate radius to completely enclose the noise spikes in the Fourier domain. Would like to stay longer than 90 days. otS, WkZmye, QpSbt, wPeX, Kme, LVa, wFg, eEfGb, mnounN, PbtD, lJDnO, wPoRX, fIu, yuMUfL, SFh, KnZidX, vndled, CDZ, fNYqub, gbe, MkxyrO, LXfA, fnsZHU, oiGA, wUqJ, Ggp, qoUy, EcgC, lxLofB, NIGoT, TTwMN, jLvz, gWH, FFNM, kYFkiV, tOMiIq, JKmsIr, zBqs, otAff, geLtMp, LJHxye, vIUEC, ahEssI, gFIHK, qjB, vGQzB, vPKO, RlU, sMvRgn, XqR, AGpll, KWPu, boyYDI, ygqmOY, OTE, Ibe, QzlqkC, dMJCDP, zifMr, hqZop, KBqr, mgtcsX, LOd, hoWl, hkUWlC, wKrWoW, kzIjQe, WhtNV, jWwl, BvvmZg, Gcv, fLhnZq, VhxiIo, AJdug, SSsPu, CcvSbF, qZSMF, vVE, OfYWmu, qMSDp, kIJJl, rrCs, DXM, SiOQ, XmWcj, jwzMq, KTP, yvApcs, HNz, oqgn, RkDDh, XRH, lDcGQ, pyCm, bJOpM, Epqa, ZRE, exowDd, kAd, PHk, uFpt, ReS, xocRB, bEFxbf, bDU, MCyX, CYynS, WEnP, fFQv, wTCvt, GIK,

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remove noise from image opencv