Error minimization of radiometric compensation for subpixel reflectance variation

We propose a novel radiometric compensation method of a projector-camera system by applying a 10 megapixel camera to reduce the artifacts around regions where the reflectance of projection surface changes steeply. The proposed method densely measures the reflection of a single projected pixel region on a projection surface with multiple camera pixels, and consequently computes multiple color-mixing matrices for the projected pixel. By using the matrices, we calculate a projection color so that the displayed colors in the projector pixel region are as close to a target appearance as possible by applying a linear least squares method. Through real projection experiments, we confirm that the proposed method can reduce the artifacts around regions where reflectance changes steeply.