Finding dupicated images

Hi!

I have this picture folder, which has duplicated image files. I wanna get rid of the duplicates, so to identify those images, I wrote below disfunctional, amature piece of code. I was trying to insert width, height, and size of all images into Lists, and then enumarate each image again, comparing the W, H, SZ values to the previously stored values. If two images have the same w, h, sz values, I'll know they are duplicates. Can anyone please either show me how to fix the code, OR show me a Different approch to it that's simpler than this?

private void recheckForDuplicatesToolStripMenuItem_Click(object sender, EventArgs e)
{
string src = Path.GetDirectoryName(Application.ExecutablePath) + "\\Pics";
string[] srcfiles = Directory.GetFiles(src);
int n = 0;
List<int> imgH = new List<int>();
List<int> imgW = new List<int>();
List<long> imgSz = new List<long>();
foreach (string srcfile in srcfiles)
{
try
{
Image img = Image.FromFile(srcfile);
imgH.Add(img.Height);
imgW.Add(img.Width);
long len = (new FileInfo(srcfile)).Length;
imgSz.Add(len);
img.Dispose();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
int x = 0;
foreach (string srcfile in srcfiles)
{
Image img = Image.FromFile(srcfile);
long len = (new FileInfo(srcfile)).Length;
for (int z = 0; z < imgH.Count; z++)
{
if (imgH[z] == img.Height && imgW[z] == img.Width && imgSz[z] == len)
{
if(x == z)
{
continue;
}
x++;
if (n >= 2)
{
//MessageBox.Show("Possible Duplicate: \n" + srcfile + "\n" +
// img.Height + " " + img.Width + " " + len);
n = 0;
}
n++;
}
}
x = 0;
img.Dispose();
}
}

THANKS!!

4 Replies

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Kip Hackman4y ago
You can look into using the LEADTOOLS SDK in your application to locate possible duplicate images in a directory. You can leverage a series of image processing commands that can compare two images to determine how similar they are. For an example see the tutorial links below.
https://www.leadtools.com/help/sdk/v22/tutorials/dotnet-console-compare-image-data-for-similarities.html
Rajanikant Hawaldar7y ago
Comparing images with height, width and length is one basic technique which first comes to mind when we start thinking ok you have do it whats next ? that you need to look further, Thats why i suggested you to study image processing and try with third party open source libraries. I hope you understand my point.
Kasun Lee7y ago
@Rajanikant Thanks for the code! But how a different technique can be a help, when my code-logic is wrong?
Rajanikant Hawaldar7y ago
You should use image processing technices, you can use open source libraries to achieve your requirements, example OpenCV etc. https://www.codeproject.com/Articles/33838/Image-Processing-using-C https://csharp-station.com/4-best-c-libraries-for-image-processing/ https://stackoverflow.com/questions/35151067/algorithm-to-compare-two-images-in-c-sharp