US 6,298,090 B1 · System for detecting redundant images in a video sequence by comparing two predetermined threshold values

Abstract

A system for detecting redundant images in a video sequence includes dividing a target image in the video sequence into a plurality of regions, and determining, for each of the plurality of regions, a local value comprising a sum of differences between individual pixels of each region and corresponding pixels in at least one other image in the video sequence. The local value for each of the plurality of regions is then compared to a first predetermined threshold. The system also includes determining a global value comprising a sum of differences between substantially all pixels in the target image and corresponding pixels in the at least one other image, and comparing the global value to a second predetermined threshold. An indication that the target image is redundant is then output in a case that the local value does not exceed the first predetermined threshold for all regions, and the global value does not exceed the second predetermined threshold.

Claims23

Dependent claims

An apparatus which detects redundant images in a video sequence, the apparatus comprising:

a memory which stores computer executable process steps;
and
a processor which executes the process steps stored in the memory so as (i) to divide a target image in the video sequence into a plurality of regions, (ii) to determine, for each of the plurality of regions, a local value comprising a sum of differences between individual pixels of each region and corresponding pixels in at least one other image in the video sequence, (iii) to compare the local value for each of the plurality of regions to a first predetermined threshold, (iv) to determine a global value comprising a sum of differences between substantially all pixels in the target image and corresponding pixels in the at least one other image, (v) to compare the global value to a second predetermined threshold, and (vi) to indicate that the target image is redundant in a case that (a) the local value does not exceed the first predetermined threshold for all regions, and (b) the global value does not exceed the second predetermined threshold.

An encoding device for encoding video data in a video sequence which includes a target image and at least one other image, the encoding device comprising:

a film mode detection circuit which determines whether the target image is a redundant image by comparing two threshold values to sums of differences between pixels in the target image and corresponding pixels in the at least one other image, where a first of the threshold values is set based on differences in content between the target image and the at least one other image, and where a second of the threshold values is set based on noise introduced into the video sequence by a device used to generate the video sequence;
and
coding circuitry which codes video data for the target image in a case that the film mode detection circuit determines that the target image is not redundant.

A system for transmitting a video sequence comprised of a target image and at least one other image, the system comprising:

a telecine device which generates and outputs video data for the video sequence based on input film images;
an encoder which codes the video data prior to transmission, the encoder comprising:
a film mode detection circuit which determines whether the target image is a redundant image by comparing two threshold values to sums of differences between pixels in the target image and corresponding pixels in the at least one other image, wherein a first of the threshold values is set based on contents of the target image and the at least one other image, and a second of the threshold values is set based on the telecine device;
and
coding circuitry which codes the video data for the target image in a case that the film mode detection circuit determines that the target image is not redundant;
and
a decoder which receives coded video data from the encoder and which decodes the video data.

4 more elements

Dependencies are inferred from the claim text.

System for detecting redundant images in a video sequence by comparing two predetermined threshold values

Life of this patent

System for detecting redundant images in a video sequence by comparing two predetermined threshold values

Life of this patent

Abstract

Claims23