Delay detector apparatus and method for multiple video sources
AssigneePixel Instruments Corp.
InventorJ. Carl Cooper
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Abstract
The apparatus and method described herein shows a system of determining the delay of a delayed version of a sequence of images with respect to a relatively undelayed version in a system which creates an output image signal from a plurality of input signals. The invention is also useful for comparing a given image to other images to determine the closest match, and thus the one of the plurality of input image sources from which an output image is taken.
Claims31
In a system where an image which is derived from one of a plurality of sources is selected to be output, an apparatus for determining if an output image is derived from a given source, said apparatus including in combination:
- a) an element for providing samples from at least one image from said given source said samples making up a first set,
- b) an element, which may be the same element as in a), for provided at least a second set of samples from at least one image from a second of said sources thereby making up a second set,
- c) an element, which may be the same element as element a) or a separate element, for providing samples from at least one image from said output said samples making up a third set,
- d) an element for determining if said third set corresponds to said first set.
In a system where images which are derived from one of a plurality of sources are selected to be output, an apparatus for determining which of said sources a subsequently output image was derived from, said apparatus including in combination:
- a) an element for providing at least a first set of samples from at least one image from a first of said sources to provide a first set,
- b) an element, which may be the same element as element a) or a separate element, for providing at least a second set of samples from at least one image from a second of said sources to provide a second set,
- c) an element, which may be the same element as element a) or b) or a separate element, for providing at least a third set of samples from at least one image from said output to provide a third set,
- d) an element for comparing said third set to said first set to determine if said sets of samples correspond, and if no correspondence is found to compare said third set to said second set to determine if said sets of samples correspond, said correspondence, if any, indicating which source said output image was derived from.
In a system where images, which are derived from one of a plurality of sources, are selected to be output, an apparatus for determining which of said sources a subsequently output image was derived from, said apparatus including in combination:
- a) an element for providing at least a first set of samples from at least one image from a first of said sources to provide a first set,
- b) an element, which may be the same element as element a) or may be a separate element, for providing at least a second set of samples from at least one image from a second of said sources to provide a second set,
- c) an element, which may be the same element as element a) or b) or may be a separate element, for providing at least a third set of samples of at least one image from said output to provide a third set,
- d) an element for comparing said third set to at least said first set and to said second set to determine which, if any, of said first and second sets said third set most closely corresponds, said correspondence indicating which source said output image was derived from.
In a system where an image which is derived from one of a plurality of sources is selected to be output, a method for determining if an output image is derived from a given source, said method including the steps of:
- a) providing at least a first set of samples from at least one image from said given source,
- b) providing at least a second set of samples from at least one image from a second of said sources,
- c) providing at least a third set of samples from at least one image from said output,
- d) determining if said third set of samples corresponds to said first set of samples.
In a system where images which are derived from one of a plurality of sources are selected to be output, a method for determining which of said sources a subsequently output image was derived from, said method including the steps of:
- a) providing at least a first set of samples from at least one image from a first of said sources,
- b) providing at least a second set of samples from at least one image from a second of said sources,
- c) providing at least a third set of samples from at least one image from said output,
- d) comparing said third set of samples to said first set of samples to determine if said sets of samples correspond, and if no correspondence is found to compare said third set of samples to said second set of samples to determine if said sets of samples correspond, said correspondence, if any, indicating which source said output image was derived from.
In a system where images, which are derived from one of a plurality of sources, are selected to be output, a method for determining which of said sources a subsequently output image was derived from, said method including the steps of:
- a) providing at least a first set of samples from at least one image from a first of said sources,
- b) providing at least a second set of samples from at least one image from a second of said sources,
- c) providing at least a third set of samples of at least one image from said output,
- d) comparing said third set of samples to at least said first set of samples and to said second set of samples to determine which, if any, of said first and second sets said third set most closely corresponds, said correspondence indicating which source said output image was derived from.
The method of measuring the delay of a video signal which is output from a video system having a plurality of video signal sources available including the steps of:
- receiving a status signal indicative of which said signal source said output video is taken from, said status signal being received from said video system,
- providing an input set of samples of one or more images from the video signal of the source identified by said status signal,
- providing an output set of samples for each of a plurality of images of said output video signal,
- comparing said input set of samples to each of said output set of samples to determine which said output set of samples most closely matches said input set of samples,
- determining the delay of said most closely matching output set of samples in response to the number of video frames which are output from said system after said input set of samples is taken.
The method of measuring the delay of a video signal which is output from a video system having a plurality of video signal sources available including the steps of:
- receiving an identification signal indicative of which said signal source said output video is taken from, said identification signal being received from said video system,
- providing a plurality of input sets of samples of one or more images from the video signal of the source identified by said identification signal,
- providing an output set of samples for one or more images of said output video signal,
- comparing each said input sets of samples to said output set of sample s to determine which said input set of samples most closely matches said output set of samples,
- determining the delay of said output set of samples in response to the number of input video frames which were input to said system before said most closely matching input set of samples was taken.
In a system where an image which is derived from one of a plurality of image sources is selected to be output, an apparatus for determining if an output image is derived from a given source, said apparatus including in combination:
- a) an element for providing a first set of samples from at least one image from said given source,
- b) an element, which may be the same element as element a) or a separate element, for providing a second set of samples from at least one image from said output,
- d) an element for determining if said second set of samples corresponds to said first set of samples.
Dependencies are inferred from the claim text.