Since glare is mixed with imaging rays, the measurement and the evaluation are always difficult research issues on physical optics. This paper describes the physical characteristics of glare by point spread function. Subsequently, a measurement method for scattering glare is proposed. Specifically, a computational processor before image formation is presented as two-arm system. The feedback subsystem is composed of digital micro-mirror device and charge-coupled device. The collection of images and modulation of glare rays is utilized by feedback subsystem to reconstruct the glare distribution. Finally, experimental results show the performance of the proposed approach. The proposed method provides the foundation to evaluate the scattering glare. In addition, the paper suggests a solving way of removing glare in visual measurement.