消除黑白图像中的噪点 [英] Remove noise in BW image

问题描述

我使用MATLAB生成了此图像(使用bwareaopen).在中间，我有一个2D椭圆形.如何清除周围的所有噪音"并获得清晰的椭圆形?

I used MATLAB to generate this image (using bwareaopen). In the middle I have a 2D ellipsoid. How can I clear all the "noise" surrounding of it and get a clear ellipsoid?

原始图片

推荐答案

看看这个解决方案.如评论中所述，我使用了 DoG-高斯差分

Have a look at this solution. As mentioned in the comments I used DoG - Difference of Gaussians

DoG是什么意思?

首先，您必须对图像使用两个独立的高斯，并使用两个独立的内核. (根据高斯，我的意思是应用高斯模糊).两种结果的差异称为 DoG .

First you have to take two separate Gaussians of an image with two separate kernels. (By Gaussian I mean apply ing gaussian blur). The difference of the two resultants is called the DoG.

这就是我所做的:

• 将给定的量转换为灰度:

• 然后我应用了双边过滤来保留边缘并平滑非边缘:

• Then I applied bilateral filtering to preserve edges and smoothen non-edges:

(如果您专心看的话，您会发现其中的区别).

(If you look intently you can see the difference).

• 高斯模糊应用于上图:

• Applied Gaussian blur to the above image:

• 现在对上面的两个图像执行 DoG 来获得此图像:(我只减去了上面的两个图像)

• Now performed DoG with the above two images to obtain this: (I merely subtracted the two images above)

• 然后，我使用椭圆核进行了形态学操作，以增强单元格的边缘:

• Then I performed Morphological operation using the ellipse kernel to enhance the edge of the cell:

• 要去除图像周围不必要的斑点，我执行了中值滤波，并最终获得了此结果:

• To remove the unwanted speckles around the image I performed median filtering and finally obtained this:

您可以优化此过程以获得增强的图像.

You can refine this process to get an enhance image .

这是我使用的代码:

import cv2

filename = 'Cell.jpg'
img = cv2.imread(filename)
cv2.imwrite('img.jpg',img)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
cv2.imwrite('gray.jpg',gray)

bi = cv2.bilateralFilter(gray,7,75,75)
cv2.imwrite('bi.jpg',bi)
blur = cv2.GaussianBlur(bi,(3,3),0)
cv2.imwrite('blur.jpg',blur)
blur1 = cv2.GaussianBlur(bi,(17,17),0)
dog = blur1 - bi
cv2.imwrite('DoG.jpg',dog)

kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(5,5))
close = cv2.morphologyEx(dog, cv2.MORPH_CLOSE, kernel, 13)
cv2.imwrite('close.jpg',close)

median = cv2.medianBlur(close,3)
cv2.imwrite('median.jpg',median)

cv2.waitKey(0)
cv2.destroyAllWindows()   

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