Motion vector field coding

A video coder includes a motion field coder for minimizing the number of motion coefficients of a motion vector field. In the coder, a first block includes means for forming a new matrix representation of the motion vector field. The new coded motion vector field is linear. A second main block includes means for merging pairs of adjacent segments if the combined segment area can be predicted using a common motion field. Merging information is transmitted to a decoder. A third main block includes means for removing motion field basis functions. After each removing step, the squared prediction error is calculated and removing is continued until the chance of the error is not acceptable. Final motion coefficients are calculated by solving a linear matrix equation. As a result, reduced numberof motion coefficients of each segment are obtained. The motion coefficients are transmitted to the decoder.

图像预测解码方法

... 在把图像尺寸可变的图像进行编码之际，当参考图像的尺寸是0时通过进行帧内编码，将增加代码量，降低压缩率。本发明提供的解决方法是在输入用预定的方法把图像尺寸可变的图像经压缩编码的图像数据、从比成为解码对象的图像之前被再生了的至少一个参考图像生成预测图像、把成为解码对象的图像进行预测解码的解码方法中，使用尺寸不是0的最近被再生了的至少一个参考图像生成预测图像。 ...

Motion vector field coding

Video encoder and decoder using motion-based segmentation and merging

This invention relates to motion compensated (MC) coding of video and to an MC prediction scheme which allows fast and compact encoding of motion vector fields retaining at the same time very low prediction error. By reducing prediction error and number of bits needed for representation of motion vector field, substantial savings of bitrate are achieved. Reduction of bitrate needed to represent motion field is achieved by merging segments in video frames, by adaptation of motion field model and by utilization of motion field model based on orthogonal polynomials.

Vedio data encoder and decoder

This invention relates to compression of prediction error in motion compensated video coding schemes. Prediction frame and motion vectors are used to extract useful information about the properties of the prediction error signal, e. g. its location, directionality, etc. This information does not need to be transmitted because the decoder of the proposed system includes means to extract this information. Information extracted by the encoder and decoder is used to adapt prediction error coding scheme which gives substantial bitrate reductions.