The corner point detection is widely used in image processing area and is very important in many practical applications. But sometimes this pixel accuracy is not enough. In that case we can use some mathematical techniques and try to find a corner point in subpixel accuracy. We have described principles of 5 subpixel detectors in this paper. The Harris corner detector was chosen for our test of subpixel detection sensitivity. For that reason we used pointing device having accuracy up to 0.01

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... els. We tested what is the smallest shift of testing image, which can be recognized by detector. There were the appropriate statistical analysis performed and the results were illustrated in graphs and table. The sensitivity of detection was determined for single image and for sequence of images too.