How to Use threads efficiently in Image Processing?

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C++

threads

multi-threading

, +

Objective : To Develop an algorithm for finding the Circles in given image

Implementation Part : VC++ 2010 + Using opencv library to find the Circles

Inputs : ROI (X,y,Width,Height) , IplImage* (Input_Image) Algorithm : So here calling the Opencv Circle function in the given ROI

So For ex:

if i have 20 circles in image, i will be having 20 ROI's

Problem: So every time algorithm is acting on sequence basis

In LOOP
Input -> ROI Function -> Find Cirlce in given ROI -> return Circle Parameter -> Output

TO DO: Need to reduce the processing time using Multithreading

Can I use two threads to do this in parallel ???