Question

How to compare one image token with camera with all the other images stored in the sd card and display the result?

public class SearchForFaces extends Activity {

    Bitmap bitmapOriginale;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle b1 = getIntent().getExtras();
        String cin= b1.getString("cin");        

        //getting the image
        File sdCard = Environment.getExternalStorageDirectory();
        File directory = new File (sdCard.getAbsolutePath() + "/Student");
        File file = new File(directory, cin+"jpg");
        try {
            FileInputStream streamIn = new FileInputStream(file);
            bitmapOriginale = BitmapFactory.decodeStream(streamIn);
            streamIn.close();
        } catch (IOException e) {
            Log.d("SearchForFaces Exception", e.getMessage());
        }
        if(bitmapOriginale.sameAs(//images from sdcard)) 
        {
            //display founded image
        }
    }
}

Answer 1

i think, its not necessary read all images..if you want compare images from camera, you can “easy” take the images in DCMI folder. But ok, user will move some files in another folder. So in that case i will advice just open first folder, read files in there and check the format, after that open another folder, read files in there and again check the formats and save the paths to the jpg files.
So in this case just easy some for, foreach, while cykl or you can do it with recursion.
You will have some ArrayList (linkedList, whatever) and in this list you can put the paths. Then just call your sameAs method.
On this you can use Environment.getExternalStorageDirectory().listFiles();

But..i am not sure if your “algorithm” will work..image recognition is really hard part of computer science..and if you dont know how to get the files on SDcard..the algorithm wouldnt probably work..
But if you want to check the similarity with byte by byte comparsion, then its ok..