The existing projector relies on a high quality screen for exhibiting a remarkable image

which would be affected by the reflecting and geometric characteristics of the screen. Aiming to relax this confinement

the projector-camera system is then developed to compensate and correct

in radiometry

the shortcomings of the display quality on the screen

in which the geometric registration between the pixels of projection and camera images becomes a foundational and significant issue. Based on the methods of lump sampling

morphologic processing

identifying and locating the sampling patches

as well as binary polynomial fitting method

a registration algorithm was achieved. The established algorithm was tested under various scenes of different display surfaces

including both flat and curved screens

together with clean and colour-patterned screens. The experimental results indicated that the mean deviation of image registration was between 0.2 to 1.0 pixel units

regardless of the change in sampling quantity. Meanwhile

the executive time of the registration was less than 10 seconds. This sound efficiency and high precision implied this algorithm is applicable to practical demands.