Apparatus for measuring velocity of a moving image or object
First Claim
1. Apparatus for measuring the velocity of a moving image or object comprising:
- a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements;
a second array of sensors extending generally in said first direction and spaced a known distance from said first array for sensing successive sets of image elements;
means for correlating said primary set of image elements with each of said successive sets of image elements and producing a correlation level indicating the level of correlation of said primary set with each of said successive sets, said means for correlating including means for comparing with said primary set each said successive set in a plurality of different positions along said first direction and for producing a comparison level indicating the level of comparison of said primary set with said successive set in each of said different positions;
means for selecting one of said correlation levels which indicates an optimum level of correlation; and
means for determining the time interval between the sensing by said first array of said primary set and the sensing by said second array of said successive set corresponding to said selected correlation level.
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Abstract
Apparatus for measuring the velocity of a moving image or object including a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements; a second array of sensors extending generally in the first direction and spaced a known distance from the first array for sensing successive sets of image elements; a device for correlating the primary set of image elements with each of the successive sets of image elements and for producing a correlation level indicating the level of correlation of the primary set with each of the successive sets; means for selecting one of the correlation levels which indicates an optimal level of correlation; and means for determining the time interval between the sensing of the first array of the primary set and the sensing by the second array of the successive set corresponding to the selected correlation level; in addition, the means for correlating may include means for comparing with the primary set each successive set in a plurality of different positions along the first direction and for producing a comparison level indicating the level of comparison of the primary set with each of the successive sets in each of the different positions along the first direction; and means for determining the displacement between the position in which the successive set is sensed and the position corresponding to the indicated comparison level.
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Citations
14 Claims
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1. Apparatus for measuring the velocity of a moving image or object comprising:
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a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements; a second array of sensors extending generally in said first direction and spaced a known distance from said first array for sensing successive sets of image elements; means for correlating said primary set of image elements with each of said successive sets of image elements and producing a correlation level indicating the level of correlation of said primary set with each of said successive sets, said means for correlating including means for comparing with said primary set each said successive set in a plurality of different positions along said first direction and for producing a comparison level indicating the level of comparison of said primary set with said successive set in each of said different positions; means for selecting one of said correlation levels which indicates an optimum level of correlation; and means for determining the time interval between the sensing by said first array of said primary set and the sensing by said second array of said successive set corresponding to said selected correlation level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for measuring the velocity of a moving image or object comprising:
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a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements; a second array of sensors extending generally in said first direction and spaced a known distance from said first array for sensing successive sets of image elements; means for comparing with said primary set each said successive set in a plurality of different positions along said first direction and for producing a comparison level indicating the level of comparison of said primary set with said successive set in each of said different positions; means for indicating the one of said comparison levels which indicates the best level of comparison produced for each said successive set and for indicating that comparison level as a correlation level indicating the level of correlation of said primary set with that successive set; means for selecting one of said correlation levels which indicates an optimal level of correlation between said successive sets and said primary set; and means for determining the time interval between the sensing by said first array of said primary set and the sensing by said second array of said successive set corresponding to said selected correlation level. - View Dependent Claims (11, 12)
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13. Apparatus for measuring the velocity of a moving image or object comprising:
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a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements; a second array of sensors extending generally in said first direction and spaced a known distance from said first array for sensing successive sets of image elements; means for comparing with said primary set a successive set in a plurality of different positions along said first direction and for producing a comparison level indicating the level of comparison of said primary set with said successive set in each of said different positions; means for indicating the one of said comparison levels which indicates the best level of comparison produced for said successive set; and means for determining the displacement between the position in which said given successive set is sensed and the position corresponding to said indicated comparison level. - View Dependent Claims (14)
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Specification