Scanning apparatus and method in water rings, and apparatus and method for encoding / decoding video streams using the same

Coding apparatus images adapted for a scanning order water rings whereby after processing image data at a point of origin of the water ring (water ring (0)), are processed the next image data in the water ring (1) adjacent, which is data of adjacent pixels to the perimeter of previous water ring (0) and then the image data of the next water ring (2) adjacent continuously processed and so on, so processing image data appears as rings water expands through the image, said apparatus comprising: means scanning start rings water to begin a scanning procedure in water rings in at least one ring origin point of water (water ring (0)) in an image frame; a determining means location exploration rings water to determine a location of a water ring (water ring (1)) which is a water ring rectangular shape surrounding the point of origin where it determines a next water ring as location of a water ring rectangular (water ring (i)) surrounding the water ring preprocessing; and means for scanning rings water to explore the image frame sequence based on water rings determined by the determining means scan location in water rings whereby the apparatus encodes a specific part of the image with a top priority, and then performs the process repeatedly coding the adjacent part of the image.