Method and apparatus for detecting motion and absence of motion between odd and even video fields
AssigneeGenesis Microchip Inc.
InventorAndrew Stuart Mackinnon
Life of this patent
Estimating the term…
Abstract
A method and apparatus are provided whereby the motion between two video fields of opposite parity may be measured so as to discriminate between the presence of motion and lack thereof. The level of motion at a specified position is determined by comparing a first motion value derived from successive fields of opposite parity with a second motion value derived from successive fields of the same parity at the spatial location corresponding to that used to generate the first motion value. This determination is made with one field being common to the first and second motion values, and taking the minimum of the first and second motion values to be the motion value at that position.
Claims5
A method for measuring motion at a horizontal and vertical position between video fields of opposite parity comprising the steps of:
- receiving pixels from a first video field of one parity, a second field of the opposite parity and a third field of said one parity;
- measuring the signal value of at least one pixel from said first video field and at least one pixel from said second video field;
- measuring the signal value of at least one additional pixel from said third video field, wherein said additional pixel is at an identical horizontal and vertical position to said at least one pixel from said first video field;
- comparing the signal values of said at least one pixel from said first video field and said at least one pixel from said second video field and generating a measure of the motion between said first and second video fields;
- comparing the signal values of said at least one pixel from said first video field and said at least one additional pixel from said third video field and generating a measure of the motion between the first and third video fields;
- and
- outputting a motion value equal to the lesser of said measure of the motion between the first and second video fields, and said measure of the motion between the first and third video fields.
Apparatus for measuring motion at a horizontal and vertical position between video fields of opposite parity comprising:
- a memory controller for receiving pixels from a first video field of one parity, a second field of the opposite parity and a third field of said one parity, each of said pixels being characterized by a signal value;
- registers for receiving and storing at least one pixel from said first video field, at least one pixel from said second video field, and at least one additional pixel from said third video field, wherein said additional pixel is at an identical horizontal and vertical position to said at least one pixel from said first video field;
- and
- differencing circuitry for (i) comparing the signal values of said at least one pixel from said first video field and said at least one pixel from said second video field and generating a measure of the motion between said first and second video fields, (ii) comparing the signal values of said at least one pixel from said first video field and said at least one additional pixel from said third video field and generating a measure of the motion between the first and third video fields, and (iii) outputting a motion value equal to the lesser of said measure of the motion between the first and second video fields, and said measure of the motion between the first and third video fields.
Dependencies are inferred from the claim text.