DCT image compression and motion compensation using the hadamard transform
US5815602A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/262
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The objective of this invention is to provide a data processor which can perform motion estimation of moving images at high speed and high accuracy. The data processor according to this invention is equipped with Hadamard transformer (110), first stage processor (120), second stage processor (130), and motion compensation circuit (140). The Hadamard transformer (110) receives image data (12) of the current frame and image data (34) of the reference frame, and Hadamard transforms this image data. First stage processor (120) block matches the target block with the Hadamard coefficient of the reference frame using multiple low-frequency coefficients selected from the Hadamard transformed data. Second stage processor (130) refers to the block matching position obtained in first stage processor (120), determines the search range in the picture data of the reference frame, and obtains the motion vector of the target block in said search range. Motion compensation circuit (140) outputs picture data which was motion compensated on the basis of the motion vector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.