Image pickup apparatus equipped with function of detecting image shaking
First Claim
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1. An image pickup apparatus having a function of detecting image shaking, comprising:
- a first image shaking detection unit which detects image shaking based on a size of a motion vector which represents a movement amount of each pixel and is detected from a plurality of successively obtained image frames;
a second image shaking detection unit which calculates a difference value obtained by comparing respective pixel values of pixels located at identical positions in a plurality of successively obtained image frames, to detect image shaking; and
a determination unit which determines whether image shaking detected by the first image shaking detection unit has converged by comparing the motion vector with a first threshold, and which determines whether image shaking detected by the second image shaking detection unit has converged by comparing the difference value with a second threshold;
wherein the determination unit determines that image shaking has disappeared, when, after image shaking detected by the first image shaking detection unit is determined to have converged, image shaking detected by the second image shaking detection unit is further determined to have converged; and
wherein the determination unit does not determine that image shaking has disappeared before image shaking detected by the first image shaking detection unit is determined to have converged, even if image shaking detected by the second image shaking detection unit is determined to have converged.
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Abstract
In an initial stage, using a global motion vector, a rough degree of image shaking is determined. After the image shaking is determined to have converged to some measure, using the difference values between frames, the finer degree of the image shaking is determined. And if it is determined to be free of image shaking, the recording photography is made to be done. Thereby, with certainty in the timing of no hand shaking and no image shaking, the photographing can be done.
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Citations
15 Claims
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1. An image pickup apparatus having a function of detecting image shaking, comprising:
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a first image shaking detection unit which detects image shaking based on a size of a motion vector which represents a movement amount of each pixel and is detected from a plurality of successively obtained image frames; a second image shaking detection unit which calculates a difference value obtained by comparing respective pixel values of pixels located at identical positions in a plurality of successively obtained image frames, to detect image shaking; and a determination unit which determines whether image shaking detected by the first image shaking detection unit has converged by comparing the motion vector with a first threshold, and which determines whether image shaking detected by the second image shaking detection unit has converged by comparing the difference value with a second threshold; wherein the determination unit determines that image shaking has disappeared, when, after image shaking detected by the first image shaking detection unit is determined to have converged, image shaking detected by the second image shaking detection unit is further determined to have converged; and wherein the determination unit does not determine that image shaking has disappeared before image shaking detected by the first image shaking detection unit is determined to have converged, even if image shaking detected by the second image shaking detection unit is determined to have converged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for controlling an image pickup apparatus having a function of detecting image shaking, comprising:
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performing first image shaking detection based on a size of a motion vector which represents a movement amount of each pixel and is detected from a plurality of successively obtained image frames; performing second image shaking detection by calculating a difference value obtained by comparing respective pixel values of pixels located identical positions in a plurality of successively obtained image frames; determining whether image shaking detected by the first image shaking detection has converged by comparing the motion vector with a first threshold, and determining whether image shaking detected by the second image shaking detection has converged by comparing the difference value with a second threshold; and determining that image shaking has disappeared, when, after image shaking detected in the first image shaking detection is determined to have converged, image shaking detected in the second image shaking detection is further determined to have converged; wherein it is not determined that image shaking has disappeared before image shaking detected by the first image shaking detection is determined to have converged, even if image shaking detected by the second image shaking detection is determined to have converged.
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Specification