Comparing pixel colors in a selected region

问题

canvas.drawCircle((float)(myMidPoint.x - myEyesDistance/2.0), myMidPoint.y, (float)30.0, myPaint);

canvas.drawCircle((float)(myMidPoint.x + myEyesDistance/2.0), myMidPoint.y, (float)30.0, myPaint);

The image shows the eyes detected using canvas. How to get the pixel colors in the circled region so that I can compare it with any preset values and tell whether eye is open or not?

See the image in link.

来源：https://stackoverflow.com/questions/17779843/comparing-pixel-colors-in-a-selected-region