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How to remove the fine hair on the hand back image

asked 2017-12-27 02:45:36 -0500

sushiqian gravatar image

I want to enhance the hand back imge, see the below image: image description

After enhance it, I got the below image, image description

My question is how to remove the fine hair on the hand back image? see the below image, I want to remove the fine hair(such as, the line enclosed in the red line), but, need to keep the vein(such as, the line enclosed in the green line)

image description

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Easier way to do this is grabcut. Can be found in OpenCV' s folder.

supra56 gravatar imagesupra56 ( 2017-12-27 03:57:16 -0500 )edit

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answered 2017-12-31 16:14:39 -0500

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Hands down best solution!

sjhalayka gravatar imagesjhalayka ( 2017-12-31 18:11:04 -0500 )edit

This is some simpler C++ code that I used to replicate sturkmen's algorithm:

Mat frame = imread("hand.png");

if (frame.empty())
{
    cout << "File read error" << endl;
    return 0;
}

int dilation_size = 2;
Mat dilation_element = getStructuringElement(
    MORPH_RECT,
    Size(2 * dilation_size + 1, 2 * dilation_size + 1),
    Point(dilation_size, dilation_size));

dilate(frame, frame, dilation_element);

imshow("frame", frame);
waitKey();

I'm deleting my own answer.

sjhalayka gravatar imagesjhalayka ( 2017-12-31 18:29:07 -0500 )edit

@sjhalayka. That's not solution. He merely wanted removing part of red lines only. Not all of them.

supra56 gravatar imagesupra56 ( 2017-12-31 20:38:14 -0500 )edit

Are you francophone?

sjhalayka gravatar imagesjhalayka ( 2017-12-31 21:59:04 -0500 )edit

Click my name.

Edit: Btw, Happy New Years!

supra56 gravatar imagesupra56 ( 2017-12-31 22:39:47 -0500 )edit

A half hour to go here in Saskatchewan. :) Happy New Year!

sjhalayka gravatar imagesjhalayka ( 2017-12-31 23:34:29 -0500 )edit

@sjhalayka BBBRRRrrrrrrr in your area. I was thinking about your code that you posted as above. Draw a rectangle to selected unwanting hair by using mouseevent method then apply your code. Then save image.

supra56 gravatar imagesupra56 ( 2018-01-01 07:39:53 -0500 )edit

Yeah it was -38C the other day, plus wind. Not fun. :) I just read about La Grande Rivière, Que., which reached -48C. That would just suck.

sjhalayka gravatar imagesjhalayka ( 2018-01-01 10:34:02 -0500 )edit
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answered 2017-12-31 15:36:05 -0500

I tried to solve your problem with the idea that you need a method applicable to similar images. So, I wrote a small algorithm that read the pixels of the image and detect when there's a sudden change in intensity(0-255) and blur the subregion. Particularly, I create an imaginary rectangle(1x9 pixel) which I iterate through the image. For each movement of the rectangle I iterate IN it vertically(that is, read 9 vertical pixels) and check for sudden delta in intensity(in this case 30) and blur that area with a normal blur. But before doing all this, I apply a threshold to highlight the hair. The result is not exactly what you asked but hey, I enjoyed myself :-). Here's the code:

#include <iostream>
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main()
{
    Mat image;
    image = imread("hand.jpg", IMREAD_GRAYSCALE);
    if (image.data==NULL)
        cout << "Img not found" << endl;
    namedWindow("hand", WINDOW_AUTOSIZE);
    Mat orig = image.clone();
    threshold(image, image, 180, 255, THRESH_BINARY);

    int height = 8;
    for(int x=0;x<image.cols;x++)
        for (int y = height / 2; y < image.rows - height / 2; y++)
        {
            int whiteToBlack = 0, blackToWhite = 0;
            for (int rectY = y - height / 2; rectY < y + height / 2 - 1; rectY++)
                if (image.at<uchar>(rectY, x) > image.at<uchar>(rectY + 1, x) && image.at<uchar>(rectY, x) - image.at<uchar>(rectY + 1, x) > 30)
                    whiteToBlack++;
                else if (image.at<uchar>(rectY, x) < image.at<uchar>(rectY + 1, x) && image.at<uchar>(rectY + 1, x) - image.at<uchar>(rectY, x) > 30)
                    blackToWhite++;
            if (whiteToBlack > 0 && blackToWhite > 0)
                for (int rectY = y - height / 4; rectY < y + height / 4 - 1; rectY++)
            blur(orig(Rect(x, y - height / 2, 4, height + 1)), orig(Rect(x, y - height / 2, 4, height + 1)),Size(3,3));
        }

    imshow("hand", orig);
    waitKey(0);
}

The result: image description

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answered 2017-12-28 10:39:24 -0500

supra56 gravatar image

The inpaint can be found on Opencv's folder either cpp or python2 C:\fakepath\Unwanted hair removed.jpg

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Asked: 2017-12-27 02:45:36 -0500

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Last updated: Dec 31 '17