Video Time-Series Motion Detection With Exposure Correction

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Solution Overview

Problem

Conventional methods for motion detection using high frame rate digital video processing fail to correct exposure errors, leading to significant measurement inaccuracies when motion duration approaches imaging exposure duration, especially when maximum exposure is used for high-quality imaging.

Innovation Solution

A method involving a processor and video sensor system that determines recording parameters, extracts data sets describing motion, calculates frequency transforms, and applies exposure correction using compensation functions to correct for measurement errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If maximum exposure duration is used for high-quality video capture, then image and video quality is improved, but motion detection accuracy deteriorates due to exposure-related measurement errors

Engineering Contradiction:

Improvevideo qualityVSAvoidmotion detection accuracy

Core Design Contradiction:

Illumination intensityVSMeasurement precision

Solution Approach 1:

The patent converts the harmful exposure-induced measurement errors into beneficial correction data. By capturing the exposure parameters (duration, timing) alongside video data, the system generates correction factors that when applied to the motion detection algorithm, actually improve measurement accuracy. The harmful distortion becomes a known variable that can be mathematically compensated for, transforming the problem into a solution.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the parameter space by introducing exposure correction factors as new variables in the motion detection process. Instead of treating exposure duration as a fixed constraint, the system varies the exposure parameters and applies corresponding correction factors, allowing the use of maximum exposure durations while maintaining accuracy through parameter-based compensation.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If exposure duration is reduced to minimize motion measurement errors, then motion detection accuracy is improved, but video quality deteriorates severely

Engineering Contradiction:

Improvemotion detection accuracyVSAvoidvideo quality

Core Design Contradiction:

Measurement precisionVSIllumination intensity

Solution Approach 1:

Rather than accepting reduced exposure as the only way to improve accuracy, the patent converts the trade-off relationship into a correction relationship. The system captures video at maximum exposure and uses the known exposure parameters to generate correction factors, thereby converting what was previously a harmful limitation into a manageable parameter that can be compensated for mathematically.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies preliminary anti-action by pre-calculating exposure correction factors based on the known exposure duration and timing before motion detection is performed. This preemptive correction approach prevents measurement errors from affecting the final results, allowing the system to use maximum exposure without suffering the previously inevitable accuracy degradation.

Inventive Principle:

Principle #9Preliminary anti-action

3Device complexity

If conventional motion detection methods are used without exposure correction, then system complexity is kept simple, but measurement accuracy deteriorates when motion duration approaches exposure duration

Engineering Contradiction:

Improvesystem complexityVSAvoidmotion detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by extracting and storing exposure parameters (duration, timing, frame rate) before the actual motion detection process. These pre-extracted parameters are then used to calculate correction factors that are applied during motion analysis. This preliminary preparation of correction data allows the system to maintain simple processing during the main detection phase while still achieving high accuracy through pre-computed compensations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary element - the exposure correction factor - that mediates between the raw video data and the final motion measurement. This correction factor acts as a bridge that translates the known exposure parameters into actionable adjustments for the motion detection algorithm, adding minimal complexity while significantly improving accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12425741B2Systems and methods for motion detection, quantification, and/or measurement with exposure correction in video-based time-series signals

Publication Date: 2025.09.23 MECHANICAL SOLUTIONS

AI summary

A system and method for detecting, quantifying, and/or measuring motion of an object and correcting for exposure includes providing a processor and at least one video sensor; determining video recording parameters of the at least one video sensor; recording, by the at least one video sensor, video of the object; extracting a data set from the video wherein the data set describes the motion of the object; calculating a frequency transform of the data set for at least one frequency; and performing exposure correction at the at least one frequency based on the recording parameters.