Image matching device and method for motion pictures
First Claim
1. An image matching method for performing an image matching by using an iterative gradient method which iteratively estimates at least one of motion or parallax of a video on a block-by-block basis based on an initial displacement vector, comprising the step of:
- forming a plurality of small blocks by dividing the block into small blocks and applying the iterative gradient method to each of the small blocks to calculate the motion or parallax for every small block.
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Abstract
A matching section performs motion estimation upon a predetermined processing unit of input video (p) by, e.g., an iterative gradient method. A motion vector (v) obtained by the iterative gradient method is obtained by the expression v=α·Δv+v0 (wherein v0 indicates an initial displacement motion vector and Δv indicates a differential vector). A characteristic amount extraction section extracts a characteristic amount from the distribution of motion vectors obtained by the motion estimation. A parameter determination section determines a conversion parameter α applied to the next processing unit by the characteristic amount. If the characteristic amount is equal to or larger than a predetermined threshold, the conversion parameter α is determined to be larger (e.g., α=1). If the characteristic amount is smaller than the threshold, the conversion parameter α is determined to be smaller (e.g., α=0.1).
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Citations
7 Claims
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1. An image matching method for performing an image matching by using an iterative gradient method which iteratively estimates at least one of motion or parallax of a video on a block-by-block basis based on an initial displacement vector, comprising the step of:
forming a plurality of small blocks by dividing the block into small blocks and applying the iterative gradient method to each of the small blocks to calculate the motion or parallax for every small block. - View Dependent Claims (2, 3, 4)
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5. An image matching device which performs an image matching by using an iterative gradient method for iteratively estimating at least one of motion and parallax of a video on a block-by-block basis based on an initial displacement vector, comprising:
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an initial displacement vector determination section for determining the initial displacement vector for a small block obtained by dividing the block into a plurality of blocks; and
a second iterative gradient method performing means for calculating the motion vector of the small block based on the initial displacement vector determined in the initial displacement vector determination section. - View Dependent Claims (6, 7)
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Specification