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Title:
IMAGE ENCODING APPARATUS
Document Type and Number:
Japanese Patent JP3734488
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To improve efficiency in prediction by adaptively switching a mode of finding a predictive image through geometrical transform and a mode of finding the predictive image through parallel moving for each block.
SOLUTION: A grid point motion estimating part 2 resulting from dividing an image estimates that to which position on a source image a grid point on a reference image moves for each block. A parallel movement vector determining part 16 finds a motion vector (parallel movement vector) when the block itself parallel moves, a motion compensation predictive part 4 performs motion compensation prediction using geometrical transform, a motion compensation predictive part 5 performs motion compensation prediction using a parallel movement, and the outputted predictive images are fed to a predictive image selecting part 6. The predictive image selecting part 6 adaptively selects a predictive image for each block and outputs the predictive image and predictive mode information. A mean vector of a plurality of motion vectors representing geometrical transform is used as a candidate for the motion vector representing the parallel movement.


Inventors:
堅田 裕之
草尾 寛
青野 友子
Application Number:
JP2004000231020
Publication Date:
January 11, 2006
Filing Date:
August 06, 2004
Export Citation:
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Assignee:
シャープ株式会社
International Classes:
H04N19/50; G06T7/20; H04N19/503; H04N19/51; H04N19/513; H04N19/54; (IPC1-7): H04N7/32; G06T7/20
Domestic Patent References:
JP313090A
JP349373A
JP6113287A
Foreign References:
Attorney, Agent or Firm:
高野 明近