A method and apparatus for processing a depth image determines a number of mods for corresponding pixels in a plurality of depth images. The systems and processes deliver an anti-fouling composition through a dispersing means, such as dispersion tubing, to the surface of a vessel hull or fixed structure below the water line. , R3 represents a C1-C10 alkyl group etc. The light diffusion bulb scatters the light of the LED by a great number of particles such that the light diffusion bulb becomes a surface light source conforming to the geometric shape thereof for uniform illumination, and the color filter bulb filters the light of the LED to thereby determine the light color of the LED lamp. The second set of streaming video segments is provided to the client device.