how to match image stored in database and retrieve related records

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SQL-Server-2008

hi i have a table named "image" in my database where i am storing fingerprints.
i have a matching and finding code in C# and both of them work perfectly well.
Let me give u an idea about how the matching is done...there are two images(picturebox) Query and Template....when i load both of these with fingerprint it matches perfectly.

i have created a folder in which there are many fingerprint images and when i load a query image and click match it gives me the perfect match (by scanning that folder) and returns the image name.

NOW
the problem is that i want to scan images from database i.e. i want that after loading the query image in the picturebox and when i click find , it should scan each image that i have stored in my database , find the perfect match and it should after matching retrieve all the data related to that image(Eg: ID,name,email,contact...etc)

below is the code for find button:

private void btnFind_Click(object sender, EventArgs e)
{
    {

        double score;
        {

            // timage = null;
            string path = @"D:\db";
            string dir = Path.GetFileNameWithoutExtension(path);
            string[] filess = Directory.GetFiles(path, "*.tif*" , System.IO.SearchOption.AllDirectories);
            MessageBox.Show(dir);




            for (var i = 0; i < filess.Length; i++)
            {

                var item = filess[i];
                //work with item here
                // MessageBox.Show(filess[i]);
                // pbxTemplateImg.Image = tImage;


                tImage = ImageLoader.LoadImage(filess[i]);
                pbxTemplateImg.Image = tImage;

                {
                    string shortFileName = Path.GetFileNameWithoutExtension(filess[i]);
                    try
                    {
                        tFeatures = provider.GetResource(shortFileName, repository);
                    }
                    catch (Exception)
                    {
                        MessageBox.Show("Unable to load features " + provider.GetSignature() + ". Try using different parameters.", "Feature Loading Error",
                                        MessageBoxButtons.OK, MessageBoxIcon.Error);
                        return;
                    }
                }






                if (qImage == null)
                {
                    MessageBox.Show("Unable to match fingerprints: Unassigned query fingerprint!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                if (tImage == null)
                {
                    MessageBox.Show("Unable to match fingerprints: Unassigned template fingerprint!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                // Matching features
                List<MinutiaPair> matchingMtiae = null;
                //double score;
                IMinutiaMatcher minutiaMatcher = matcher as IMinutiaMatcher;
                if (minutiaMatcher != null)
                {
                    score = minutiaMatcher.Match(qFeatures, tFeatures, out matchingMtiae);

                    if (qFeatures is List<Minutia> && tFeatures is List<Minutia>)
                    {
                        pbxQueryImg.Image = qImage.Clone() as Bitmap;
                        Graphics g1 = Graphics.FromImage(pbxQueryImg.Image);
                        ShowBlueMinutiae(qFeatures as List<Minutia>, g1);
                        //pbxQueryImg.Invalidate();

                        //pbxTemplateImg.Image = tImage.Clone() as Bitmap;
                        Graphics g2 = Graphics.FromImage(pbxTemplateImg.Image);
                        ShowBlueMinutiae(tFeatures as List<Minutia>, g2);
                        //pbxTemplateImg.Invalidate();

                        if (score == 0 || matchingMtiae == null)
                            MessageBox.Show(string.Format("Similarity: {0}.", score));
                        else
                        {
                            List<Minutia> qMtiae = new List<Minutia>();
                            List<Minutia> tMtiae = new List<Minutia>();
                            foreach (MinutiaPair mPair in matchingMtiae)
                            {
                                qMtiae.Add(mPair.QueryMtia);
                                tMtiae.Add(mPair.TemplateMtia);
                            }
                            IFeatureDisplay<List<Minutia>> display = new MinutiaeDisplay();

                            display.Show(qMtiae, g1);
                            pbxQueryImg.Invalidate();

                            display.Show(tMtiae, g2);
                            pbxTemplateImg.Invalidate();
                            if (score > 70)
                            {
                                MessageBox.Show(string.Format("Similarity: {0}. Matching minutiae: {1}.", score,
                                                              matchingMtiae.Count));
                            }
                        }
                    }
                    else
                        ShowResults(score, matchingMtiae);

                }
                else
                    score = matcher.Match(qFeatures, tFeatures);
                if (score < 70)
                {
                    //MessageBox.Show("match nt found");
                    //break;


                }
                else
                {

                    MessageBox.Show("match found");
                    break;
                }

            }
        }
    }
}

Posted 9-Mar-13 18:50pm

Member 8657300

Updated 9-Mar-13 21:34pm

Sandeep Mewara

v2

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Maciej Los · Answer 1 · 2013-03-10T01:48:00

Solution 1

There are several methods to compare images. See this: http://stackoverflow.com/questions/843972/image-comparison-fast-algorithm[^].

Here is pretty good example: Simple image comparison in .NET[^]

Posted 10-Mar-13 1:48am

Maciej Los

Comments

Member 8657300 10-Mar-13 11:26am

hi maciej
thanks for link , but as i mentioned above my code is for matching fingerprints...for which i have the above code...i just wanted to access the database , match each image with the query image that i will provide...and after finding the perfect match it should return other records....the code i have mentioned above matches perfectly but the problem is it matches fingerprints stored in a folder...i want it to match fingerprints stored in a database...
/////////////////////////////////////////////////////////////////////////////////////
string path = @"D:\db";
string dir = Path.GetFileNameWithoutExtension(path);
string[] filess = Directory.GetFiles(path, "*.tif*" , System.IO.SearchOption.AllDirectories);
MessageBox.Show(dir);
///////////////////////////////////////////////////////////////////////////////////
this is the code i am using for scanning the folder...you can also see the path i have mentioned(folder's)