Motion detection and motion compensative prediction circuit

• US 6,160,584 A
• Filed: 05/19/1998
• Issued: 12/12/2000
• Est. Priority Date: 05/21/1997
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yanagita, Yukio
• Primary Examiner(s): LEE, Y YOUNG
• Application Number:
  US09/080,927
• Time in Patent Office: 938 Days
• Field of Search: 348/699, 348/384, 348/390, 348/400, 348/401, 348/402, 348/409, 348/415, 348/416, 382/232, 382/236, 382/238
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/433 characterised by techniques for memory access
• CPC Class Codes: H04N 19/523 with sub-pixel accuracy
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 5/145 Movement estimation for video coding H04N19/51

Abstract

A motion detecting and motion compensative prediction circuit includes an integer pixel accuracy calculating unit for carrying out calculation for detecting, with an integer pixel accuracy, a portion most approximate to an object of a current frame from a predetermined reference frame, and a half pixel accuracy calculating and motion compensative prediction unit (including a buffer memory, a re-arranging unit for rearranging a picture data supplied thereto through the buffer memory by a pixel unit, and an interpolation unit for subjecting the picture data re-arranged by the re-arranging unit to linear interpolation calculation). The buffer memory, the re-arranging unit and the interpolation means of the half-pixel accuracy calculating and motion compensative prediction unit are commonly employed both of a processing for detecting a half-pixel accuracy motion vector based on the calculation result of the integer pixel accuracy calculating unit and a processing for generating a predictive-coded picture by using the motion vector.

Claims

1. A motion detecting and motion compensation prediction circuit comprising:

a frame memory carrying information regarding related image frames and providing outputs thereof to an integer pixel accuracy calculating unit that calculates relative position information of an object in different ones of said related image frames;

a buffer memory accepting output from said frame memory and said integer pixel accuracy calculating unit;

a pixel data input unit connected to said buffer memory and said frame memory for accepting data therefrom;

an interpolated pixel data generating unit connected to and for accepting the output of said pixel data input unit;

a subtractor accepting the output of said pixel data input unit and said interpolated pixel data generating unit and providing an output therefrom;

a comparison unit accepting the output of said subtractor and providing a motion vector output to at least said buffer memory;

wherein said buffer memory, said pixel data input unit, and said interpolated pixel data generating unit are operative during processing for the detection of a half-pixel accuracy motion vector based on a calculation result of said integer pixel accuracy calculating unit and during processing for generating a predictive-coded picture by using said motion vector.