초록 ▼

A transformation method provides a multi-dimensional affine transformation for representing motion between corresponding image components of successive video image frames. The multi-dimensional affine transformations can represent complex motion that includes any or all of translation, rotation, mag

A transformation method provides a multi-dimensional affine transformation for representing motion between corresponding image components of successive video image frames. The multi-dimensional affine transformations can represent complex motion that includes any or all of translation, rotation, magnification, and shear. The transformation method of this invention includes determining motion transformations between corresponding pixels in the image components of the first and second video image frames. From the motion transformations between corresponding pixels, multi-dimensional affine motion transformations between the corresponding image components are determined. This transformation method increases the accuracy with which complex motion is represented and results in fewer compression or encoding errors in comparison to conventional methods, thereby increasing compression efficiency.

대표청구항 ▼

[ We claim:] [1.] In a method of encoding, in a compressed format, information within a video image frame sequence having first and second video image frames, a method of determining quantized multi-dimensional motion transformations between corresponding image components of the first and second vid

[ We claim:] [1.] In a method of encoding, in a compressed format, information within a video image frame sequence having first and second video image frames, a method of determining quantized multi-dimensional motion transformations between corresponding image components of the first and second video image frames, comprising:determining multi-dimensional affine motion transformations between representations of the corresponding image components on the first and second video image frames; andquantizing the multi-dimensional affine motion transformations between the corresponding image components, wherein the quantizing step includes for each of the components;selecting reference pixel coordinates within each component in the second video image frame, including selecting a number of reference pixel coordinates to encode motion for an image component depending on complexity of motion of pixels in the image component, wherein two reference pixel coordinates are encoded for rotation and magnification; and three reference pixel coordinates are encoded for shear;applying a multi-dimensional affine motion transformation to the selected reference coordinates within each component to find corresponding pixel coordinates in the first video image frame; andencoding for transmission or storage the reference pixel coordinates and the relative positions of the corresponding pixel coordinates so that a motion transformation can be derived from the reference pixel coordinates and the corresponding pixel coordinates during decoding operations;wherein the encoding step includes independently encoding image components using the selected number of reference pixels such that the number of reference pixels encoded per image component vary depending on the complexity of the motion of the pixels within the image component.