The influence of the velocity and the size of an object on the quality of an optical novelty filter designed using a bacteriorhodopsin film

When the parameters of a bacteriorhodopsin (bR) film are fixed, the quality of the output image of an optical novelty filter depends on the velocity and the size of the image of the object on the bR film. The contrast of the output image changes with the velocity and the size. When the velocity is small, it tends to saturation. The detectable minimum velocity increases with increasing size of the input image and increasing lifetime of the M state and it tends to a fixed value when the lifetime of the M state is longer than 25 s. We discuss the relation between the velocity and the gradient I_g and the contrast I_c. The optimizing ranges of the velocity are given for different sizes. We also discuss the relation between the size and the gradient I_g and contrast I_c. We make a suggestion about which kind of bR film is suitable for use in the novelty filter.