Video camera with electronic picture stabilizer
First Claim
1. A video camera with electronic picture stabilizer which evaluates a whole motion vector by utilizing portion motion vectors of a plurality of detection areas defined within an image field, comprising:
- averaging means for determining an average vector that is a mean value of the portion motion vectors;
dispersion calculating means for determining a dispersion by adding absolute values of differences between the portion motion vectors and the average vector to each other to obtain an addition result, and by dividing the addition result by the number of the absolute values;
comparing means for comparing the dispersion with a predetermined threshold value; and
whole motion vector detecting means for detecting the whole motion vector in accordance with a first method in response to a first comparison result and in accordance with a second method, different from the first method, in response to a second comparison result;
whereinsaid whole motion vector detecting means detects a whole motion vector in accordance with the first method by selecting a minimum portion motion vector of all of the portion motion vectors.
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Abstract
A video camera includes a motion detecting circuit in which correlative values of pixels at a present field are evaluated through the comparison of an image signal of a last field and an image signal of the present field. In the motion detecting circuit, an average correlative value and a minimum correlative value are further evaluated. A microcomputer determines whether or not these correlative values satisfy predetermined conditions for each of detection areas defined within an image field. A detection area which satisfies all the predetermined conditions becomes a valid detection area. A whole motion vector is detected by methods different from each other according to the number of the valid detection.
60 Citations
12 Claims
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1. A video camera with electronic picture stabilizer which evaluates a whole motion vector by utilizing portion motion vectors of a plurality of detection areas defined within an image field, comprising:
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averaging means for determining an average vector that is a mean value of the portion motion vectors; dispersion calculating means for determining a dispersion by adding absolute values of differences between the portion motion vectors and the average vector to each other to obtain an addition result, and by dividing the addition result by the number of the absolute values; comparing means for comparing the dispersion with a predetermined threshold value; and whole motion vector detecting means for detecting the whole motion vector in accordance with a first method in response to a first comparison result and in accordance with a second method, different from the first method, in response to a second comparison result;
whereinsaid whole motion vector detecting means detects a whole motion vector in accordance with the first method by selecting a minimum portion motion vector of all of the portion motion vectors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a video camera, comprising the steps of:
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(a) calculating dispersion of a plurality of portion motion vectors; (b) comparing the dispersion calculated in step (a) with a first value; (c) based upon the comparison of step (b), determining a whole motion vector in accordance with a first method if the dispersion is greater than the first value, and in accordance with a second method, different than said first method, if the dispersion is less than the first value; and (d) controlling the video cameras in accordance with the whole motion vector determined in step (c);
whereinstep (c) includes determining the whole motion vector in accordance with the first method by selecting a minimum portion motion vector of all the portion motion vectors. - View Dependent Claims (9, 10, 11, 12)
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Specification