Patent ID: 8295353
Filing Date: 2012-10-23
Classification: H04N

Abstract:
1. An image encoding device that encodes data of an input moving image based on an interlace system by using a moving-image coding system that is capable of generating a chrominance-component motion vector based on a luminance-component motion vector during decoding, the image encoding device comprising: a motion-vector output unit that sequentially receives data of images obtained by at least vertically dividing an image in each field included in the input moving image, and that outputs the luminance-component motion vector for searching for a region similar to a encoding target region to be encoded in one of the divided images from a reference image based on another divided image at the same position, and outputs a field type of the reference image referred to by the motion vector; a reference-region determining unit that determines whether or not the chrominance-component motion vector generated based on the luminance-component motion vector output from the motion-vector output unit specifies a reference prohibition region preset at least one of outside an upper boundary of the reference image and outside a lower boundary of the reference image, for each combination of a field type of the region to be encoded and the field type of the reference image, the field type of the reference image being output from the motion-vector output unit; and a motion-vector output restricting unit that prohibits, when the chrominance-component motion vector generated based on the luminance-component motion vector output from the motion-vector output unit specifies the reference prohibition region, the luminance-component motion vector from being output as a motion vector specifying a region that is most similar to the region to be encoded.