Abstract: A video signal encoding/decoding system reduces ringing noise by using a post-filter which performs anisotropic diffusion on decoded data. The exemplary system uses an encoding/decoding technique such as that developed by the Moving Picture Experts Group (MPEG). The post-filter processes individual blocks of pixels, assigning an individual edge significance threshold to each block. Noise removal occurs if the edge strength is below the threshold and is inhibited if the edge strength is above the threshold.

Abstract: A gutter washer comprising a wheel-shaped guide disposed rotatably on a cylindrical section of a nozzle is adapted to run on a roof gutter rim. The guide comprises a guide rim projecting radially from one end of a guide hub member, which rotates on the nozzle cylindrical section, and a plurality of lugs jutting radially from an opposite end of the hub member. Thus, the hub member becomes a circumferential track with the guide lugs running inside and the guide rim running outside of the gutter rim. When a gutter spike is encountered, the guide lugs step over it while keeping at least 2 lugs below the rim which is tangent to the circumferential track. A rigid tube is attached to the nozzle near the guide rim at a first tube end; the second tube end is adapted for connection of a garden water hose.