Determining a regional shot-change parameter
AssigneeSnell Limited
InventorJonathan Diggins
Life of this patent
Estimating the term…
Abstract
To determine a regional shot-change parameter for an image identified as a whole as a shot change image, a difference is taken between each pixel in that image and a spatially equivalent pixel in an adjacent image in the sequence. A pixel is flagged as a shot-change pixel when the difference for that pixel and around three of the spatially adjacent pixels exceed a threshold. If a pixel is spatially isolated from other shot-change pixels, it is not regarded as a shot-change pixel.
Claims14
A method of determining by a programmable device a regional shot-change parameter for control of the processing of an image in a sequence of images, the method comprising:
- identifying an image as a shot-change image by analysis of the whole image;
- representing, by the programmable device, that image as a set of pixels;
- evaluating, by the programmable device, a difference measure indicative of the difference between a pixel in that image and a spatially equivalent pixel in an adjacent image in the sequence;
- determining, by the programmable device, that said pixel is a shot-change pixel when the difference measure for said pixel and the difference measure for a defined number of the spatially adjacent pixels exceed a threshold;
- and
- forming, by the programmable device, said regional shot-change parameter from the determined shot-change pixels.
An apparatus for determining a regional shot-change parameter for control of the processing of an image in a sequence of images, the apparatus comprising:
- a flag unit for flagging an image identified as a shot-change image by analysis of the whole image;
- a difference evaluator for evaluating a difference measure indicative of the difference between a pixel in that image and a spatially equivalent pixel in an adjacent image in the sequence;
- and
- an analysis unit for determining that said pixel is a shot-change pixel when the difference measure for said pixel and the difference measure for a defined number of spatially adjacent pixels exceed a threshold.
A method of determining a regional shot-change parameter for control of the processing of an image in a sequence of images, the image having been identified as a shot-change image by analysis of the whole image, the method comprising:
- representing the image as a set of pixels;
- evaluating a difference measure indicative of the difference between a pixel in the image and a spatially equivalent pixel in an adjacent image in the sequence;
- determining that said pixel is a shot-change pixel when the difference measure for said pixel and the difference measure for a defined number of the spatially adjacent pixels exceed a threshold;
- and
- forming said regional shot-change parameter from the determined shot-change pixels.
A computer readable medium containing instructions adapted when executed to cause a programmable apparatus to implement a method of determining a regional shot-change parameter for control of the processing of an image in a sequence of images, the image having been identified as a shot-change image by analysis of the whole image, the method comprising:
- representing the image as a set of pixels;
- evaluating a difference measure indicative of the difference between a pixel in the image and a spatially equivalent pixel in an adjacent image in the sequence;
- determining that said pixel is a shot-change pixel when the difference measure for said pixel and the difference measure for a defined number of the spatially adjacent pixels exceed a threshold;
- and
- forming said regional shot-change parameter from the determined shot-change pixels.
Dependencies are inferred from the claim text.