Rotation State Estimation from Partial Video Sequences
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Solution Overview
Problem
Existing techniques for estimating the rotational state of an object, such as a flying ball, require a video image corresponding to one period to be obtained, which is not feasible when observation time is short.
Innovation Solution
A rotational state estimation device and method that generate object images from an input video and estimate the rotational state by selecting a hypothesis with high likelihood based on object images at different times, using a rotational state estimation unit to analyze the similarity between images at time t and time t+tc, where tc is an integer greater than 1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a video image corresponding to one period is obtained to estimate rotational state, then measurement precision is improved, but observation time must be extended
Solution Approach 1:
The patent applies partial action by using only a portion of the rotational period (tc units where tc < T) rather than requiring a complete period. The rotational state is estimated by comparing object images at time t and time t+tc, where tc is less than the full period T. This allows rotational state estimation to be performed with partial observational data, reducing the required observation time while maintaining estimation capability through likelihood-based hypothesis selection.
2Measurement precision
If object images at different times are compared to estimate rotational state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses copying by generating a hypothetical rotated image from the object image at time t according to each rotational state hypothesis, then comparing this copied/generated image with the actual object image at time t+tc. This allows the system to evaluate multiple hypotheses by creating virtual copies of the initial image transformed according to each hypothesis, enabling precise rotational state estimation through image comparison without requiring complex direct measurement mechanisms.
Data Source
AI summary
A technique that enables, even if a video image corresponding to one period is not obtained, estimating a rotational state of an object is provided. The rotational state estimation device includes: an object image generation unit 1 that generates object images, each of the object images being an image of an object, from an input video image; and a rotational state estimation unit 3 that estimates a rotational state of the object by selecting, from among a plurality of hypotheses of the rotational state, a hypothesis of the rotational state, a likelihood of an image of the object resulting from the object in the object image at a certain time being rotated for tc unit time based on the hypothesis of the rotational state being high, using the object image at a time t and the object image at a time t+tc where tc is a predetermined integer of no less than 1.