Process for precisely identifying a desired location on a video tape
First Claim
1. A process for precisely identifying a desired location on a linear storage medium, particularly a magnetic tape, comprising:
- storing a first set of calculated scene detection data from each of a set of video frames on the tape;
scanning the scene detection data to find a point of interest near the desired location;
locating a reference point on the tape near the desired location, the reference point being prior to the point of interest;
storing a second set of scene detection data from a set of video frames located around the reference point for a first number of samples;
comparing the first and second sets of scene detection data to determine an offset; and
adjusting the tape to the desired location using the determined offset.
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Accused Products
Abstract
A process that allows precise control of the tape position in consumer videotape devices, such as camcorders, for the purpose of video editing. The process involves the use of a software algorithm within the central processing unit of a computer to locate a specific video frame with digitized video. The process first involves storing an initial set of calculated scene detection data, including luminance and change of luminance values for each video frame. Then, at the time of the video editing, a second set of scene detection data from the videotape is taken at a reference point, near the location of the desired frame. The second set of scene detection data is compared to the first set of scene detection data to determine whether there is any offset between the expected location of the frame, as shown in the first set of scene detection data, and the actual location of the desired frame, as shown in the second set of scene detection data. If there is any offset, the videotape can then be adjusted by the determined amount of offset to locate the desired frame.
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Citations
20 Claims
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1. A process for precisely identifying a desired location on a linear storage medium, particularly a magnetic tape, comprising:
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storing a first set of calculated scene detection data from each of a set of video frames on the tape; scanning the scene detection data to find a point of interest near the desired location; locating a reference point on the tape near the desired location, the reference point being prior to the point of interest; storing a second set of scene detection data from a set of video frames located around the reference point for a first number of samples; comparing the first and second sets of scene detection data to determine an offset; and adjusting the tape to the desired location using the determined offset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for precisely identifying a desired location on a linear storage medium, particularly a magnetic tape, comprising:
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storing a first set of calculated scene detection data from each of a set of video frames on the tape; scanning the scene detection data to find a point of interest near the desired location; searching the tape for a reference point the reference point being prior to the point of interest; playing the tape from the reference point and storing a second set of scene detection data for a first number of samples; comparing a second number of samples around the point of interest from the first set of scene detection data to the second set of scene detection data to determine an alignment position; determining an offset from the alignment position of the first set of scene detection data and the second set of scene detection data; and adjusting the tape by the determined offset to find the desired location on the tape. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A process for precisely identifying a desired location on a linear storage medium, particularly a magnetic tape, comprising:
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calculating and storing a first set of scene detection data from each of a set of video frames on the tape; scanning the first set of scene detection data to find a point of interest near the desired location, the point of interest being at a location on the tape where the scene detection data is characterized by unusual localized changes; searching the tape for a reference point near the desired location, the reference point being located prior to the point of interest; playing the tape from the reference point and storing a second set of scene detection data for a first number of samples; comparing a second number of samples around the point of interest from the first set of scene detection data to the second set of scene detection data by use of a matching algorithm to determine an alignment position; determining an offset from the alignment position of the first set of scene detection data and the second set of same detection data; and adjusting the tape by the determined offset to find the desired location on the tape. - View Dependent Claims (17, 18, 19, 20)
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Specification