image processing

The main part of the project is detecting a big thick black circle in a photo, of uniform radius that is facing the camera. Please see this link for a example photo [url removed, login to view]

We already have a front end and back end to our software but our programmer had problems detecting the circle. You can see a shot here of our app, of exactly what we want (the inner green circle doesn’t need detecting, its always in relation to the outside red circle) [url removed, login to view]

Full commented source code will be provided if your bid is accepted

the code has been written in C++ using Microsoft Visual Studio 2005. The UI is written using Delphi 7 and components:

PNG Components 1.0 RC3 [url removed, login to view] (I am not sure if you will need to know this component, I think it deals just with png files)

To summarise the work needed

1. Write algorithm to detect a circle.

2. Tie the algorithm to our already made UI

3. Do 1 hours work moving a few buttons around on the UI.

We may consider splitting the job into two parts if you only know c++ and can write the algorithm for us, we will get someone else to add it to our app using delphi, but we would prefer someone who can do both.

When doing the circle detection we think it may best to write something from scratch as we have already tried using "Sobel edge detection" but our last programmer couldnt get good results from it. I suggest just starting by searching in from the right hand side of the picture and looking for a thick black line half way down the picture, and going from there.

Here are some more example photos for you to download.

[url removed, login to view]

If you can produce an example app that draws a circle of finds 4 points around the inside of the black circle as on the screenshot, and your price is right you will probably win the bid. We have money to start on this immediately.

We are looking for a long term partnership with a programmer.


Thomas Seidl

Head of operations



Just to clarify, we are trying to draw a circle around the inside edge of the outter black circle. It is shown here in red on our app. This circle was done manually.



Thomas Seidl

Evner: C programmering, Delphi, Fotografi, Visual Basic, Windows Skrivebord

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Om arbejdsgiveren:
( 7 bedømmelser ) Henley on thames, United Kingdom

Projekt ID: #296353

Tildelt til:


Please check PM.

$380 USD in 7 dage
(80 bedømmelser)

15 freelancere byder i gennemsnit $457 på dette job


hi, Please check the PMB, thanks. Richard

$750 USD in 15 dage
(28 bedømmelser)

Hi, I made the working app (it find the center of the circle). See PM for URL to it. WBR, YetiDi

$280 USD in 3 dage
(16 bedømmelser)

I have done work like this in the past. In my rating, you can see one project I did like this here at GAF.

$250 USD in 10 dage
(32 bedømmelser)

Can help you. Regards, Dmitry

$750 USD in 15 dage
(4 bedømmelser)

Hi, PM sent. Regards

$400 USD in 3 dage
(6 bedømmelser)

Hi, yes I can do both tasks! I have image processing codes (in C++) at hand and I'll also do the necessary changes to your delphi app. Let me do this..

$350 USD in 14 dage
(9 bedømmelser)

Hi, i'm interested in your project. I work with c++ under windows and linux. I already done many image processing stuff. Please see pmb. Thanks.

$500 USD in 14 dage
(5 bedømmelser)

I have the algorithm ready and working (check PM)

$350 USD in 3 dage
(2 bedømmelser)

hi i can do both

$750 USD in 15 dage
(0 bedømmelser)

Please check PMB for details.

$650 USD in 4 dage
(0 bedømmelser)

Implemented the algorithm which finds the circle, created a sample app using it that marks the circle, please check PMB

$400 USD in 2 dage
(0 bedømmelser)

Hi, I have done many image processing projects in C++. I can write the optimized algorithm for you in C++. Please contact through PM for further details.

$500 USD in 7 dage
(0 bedømmelser)

I'm quite late, but I have tried my code on your set of pictures. The successed rate is 100%. I had experience on human detect project of this site. Hope to work with you!

$300 USD in 3 dage
(0 bedømmelser)

I'm software engineering My Graduation project is Iris Recognition System and my part is segment the iris from an eye ,Iris recognition is a method of biometric authentication that uses pattern recognition techniques b Flere

$250 USD in 5 dage
(0 bedømmelser)