Fast Algorithm for Dynamic Range Expansion of Images in Optoelectronic Measurement Systems

The paper proposes a new fast method for increasing the dynamic range of brightness of images projected onto an object and registered by an optoelectronic system. The influence of photon noise on the accuracy of brightness values determination is analyzed. An algorithm realizing the increase of the dynamic range of brightness of images registered by the optoelectronic system is proposed. For this purpose, a three-color RGB image is projected onto an object. Each channel contains encoded information about the brightness field in one of the selected modules of the residual class system. An experimental validation of the proposed algorithm is carried out. The dynamic range extension up to 20 binary digits of digital image digitization is achieved. The speed of data processing was increased several times due to combining several test images into one and using a cascade scheme of their processing.