DOUBT IN IMAGE PROCESSING

[elecs_gene]

guys,
i have a doubt in image processing...suppose i have a circle in my image and i don't know what is the centre or its radius and given the fact that the circle can be located anywhere, can u give me some kind of algorithm through which i can determine the circle and its radius....

regards

 

[leekk8]

I have an idea...don't know work or not.

You try to get 2 images with same background. Totally same background. 1 image with circle and another image without circle. Do substraction on the 2 images, then you can locate the circle and determine the radius.

Hope this can help you.

 

[booklog]

You can use edge detection technique to find out the circle. But i don't know how to find out the radius of the circle.

 

[itsthetimetodisco]

this is a famous problem and can be solved by using Hough Transform. use the paramater as Circle instead of the normal line finding algorithm.

 

[konarkk]

If ur r in beginner stage then edge detection is easy otherwise u get a help from image toolbox of MATLAB

 

[mahdithdn]

this is a famous problem and can be solved by using Hough Transform. use the paramater as Circle instead of the normal line finding algorithm.

yes, its a classic solution for this kind of problems.
regards

 

[itsthetimetodisco]

this problem occurs often for medical imaging purposes, where for example, u need to find out certain cancerous cells in an image. surely there must be tons of papers on this topic.

 

[pravish]

Is it possible to discern the circle from the rest of the field? Is it a blob? Your question
comes under blob analysis. Can u send me a sample of the image u r working on?
Is the circle of a different color? Reply to these question ...may be i can help u.

 

[jeyapreetha]

You can use edge detection technique to find out the edges of the circle. Find the maximum difference between two edge co-ordinates of the circle. That will be the diameter. Then u can find the radius. I don’t know whether this will work or not.

 

[flora]

Apply high pass filtering so that the edges get deteced.