A Synthetic Color Correction Method of Multi-projectors Display System

In the multi-projectors display system, color correction is still a primary problem without a perfect solution. The difficulty of color correction mainly comes from three points: intensity transform function (ITF) calibration, intensity balancing and edge blending. In this paper, a synthetic color correction method composed of new algorithms against the three points is proposed. For ITF calibration, an ITF principal component model (IPCM) was constructed via the principal component analysis (PCA) to the ITF sample database (ISD), which was built by measuring lots of projectors. For projector intensity balancing, an algorithm based on wavelet transform was proposed. By introducing the human eye´s contrast sensitivity function (CSF) to wavelet transform, the intensity distribution map was filtered to fit human vision. For edge blending, a nonlinear algorithm based on bi-directional trigonometric function (BTF) was proposed. The BTF was defined and the BTF weighted intensity attenuation template was generated for every projector. It is shown in the experiments that the proposed method has advantages in the three difficult points compared with existing methods.