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2014-01-02 05:31:02 -0500 asked a question How to completly disable back button of a browser while taking online exam?

Hai All,

In online examination once candidate has clicks on start button i dont want to allow him to go back (to previous pages) and he should be in same page if he do any activities by using browser properties.Once he click on the submit button he is coming out of that page.

Here if i clear the cache and press the browser back button the page says as "Document Expired The requested document is not available in Firefox's cache." Therefore i dont want to clear cach insted i need to competly disable back button ie nothing should happen on clicking the back button.

if anybody knows let me know how to achieve this concept......


2013-06-25 06:16:01 -0500 asked a question How to do skin detection in php extension?

I am working with opencv 2.3.1.
I am able to do skin detection in opencv for the frontface image but i need to do that while doing user interface with php i need to convert opencv code to php.yes i did it and i am getting smooth,canny edge ,hsv etc in php extension.

My problem is that in php extension how to write a PHP_METHOD for skin detection?.if any one know please help me .....


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2013-05-30 05:46:52 -0500 asked a question How to get co-ordinates of a point in original image?

Hai, I am working with ear detection in frontal face with opencv and c++.I am taking ROI to detect ear point as shown bellow.

image description

Yes i detected point of ear as p(x,y),But my problem is that i need a co-ordinate of that point corresponding to original image as shown bellow.

image description

is there any method in opencv to do this one if no please guide me about how to do this one?.


2013-05-30 04:32:36 -0500 commented answer how to remove trackbar from opencv image window?

Thanks .............i got it

2013-05-24 05:42:44 -0500 asked a question how to remove trackbar from opencv image window?

I am working with TrackBar in opencv.I need to display trackbar if i click left mouse button and need to remove trackbar after clicking mouse middle button.

after clicking left mouse button its displaying trackbar but how to remove from the same window on clicking middle mouse button? can any one give me a suggestion about how to do this one.


2013-05-23 08:04:02 -0500 received badge  Editor (source)
2013-05-23 08:02:00 -0500 asked a question cvWaitKey is not generating key codes for naviagation keys

I have involved with opencv key function ie cvWaitKey(0).whenever i press the "r" key the point on opencv image window is moving right direction, for "L" towards left ,for "u" upward direction as bellow.

            int key = cvWaitKey(0);
            if (key == 'u'){
                y -= 1;

            }else if(key=='d'){
                y += 1;

            }else if(key=='l'){
                x -= 1;

            }else if(key=='r'){
                x+= 1;


yes it working fine.

My problem is with arrow keys the function cvWaitKey(0) is not working. Does Opencv provide a another function? if not can anyone give me suggestion about how to do that?

Thanking You.

2013-03-26 02:18:14 -0500 asked a question ear detection in profile face using opencv and c++

i am able to detect profile face and identified by rectangle.after profile face i need to detect ear in that to do this.