US 9,071,842 B2 · Detection of video feature based on variance metric

Abstract

A metric representing the sum of variances for pixel blocks of a region of an image are used to identify the presence a video feature of the image, and a transcoding is performed responsive to identifying the presence of the video feature. The identified video feature can include, but is not limited to, a scene change, the presence of a black border region or a caption region, or the complexity of the image. The transcoding operation can include, but is not limited to, coding the image as an Intra-frame, omitting the content corresponding to the black border region or the caption region from the transcoded image or allocating a relatively lower bit budget for the black border region or a relatively higher bit budget to the caption region during transcoding of the image, or setting the bit budget for rate control during transcoding.

Claims4

Dependent claims

A system comprising:

a feature detection module to determine a first sum of variances metric representing a sum of variances of pixel blocks of a region of an image of a video signal, to determine a second sum of variances metric representing a sum of variances of pixel blocks of a corresponding region of at least the preceding image, and to determine the image represents a scene change based on a difference between the first sum of variances metric and an average sum of variances metric for a plurality of preceding images, the second sum of variances metric being represented in the average sum of variances metric;
and
a transcoder to transcode the video signal to generate a transcoded video signal, the transcoder to perform at least one transcoding operation in response to the feature detection module determining the image represents a scene change.

Dependencies are inferred from the claim text.

Detection of video feature based on variance metric

Life of this patent

Detection of video feature based on variance metric

Life of this patent

Abstract

Claims4