NIH Image can capture, process, and analyze images. It can also capture, process, and analyze images. Don't re-invent the wheel. Also, use correct terminology. You will need something to look at, such as a sample .
Frame grabbers get the image from the camera into the computer.
Image capturing software gets the picture from the frame grabber, and into the computer memory. Image analysis is the determination of information from the picture, such as length, area, perimeter, angles, line profiles, histograms, power-spectrums, and particle counting. The average person can usually make a lousy image twice as good. The average imaging system costs about 10X's as much to do the same. Finally, if you want to capture still images, then don't use a TV camera.