Rolling Shutter Sensor Line-by-Line Position Change Detection
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Solution Overview
Problem
Existing motion detection techniques require a minimum frame period for comparison, limiting the ability to analyze position changes in real-time, especially in applications like head-mounted displays where rapid position adjustments are common.
Innovation Solution
An electronic apparatus with a rolling shutter method area sensor and a detector that analyzes inter-frame differences for each line, allowing for immediate detection and adjustment of position changes during the imaging period, enabling rapid position change analysis and display synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame-based comparison is used for motion detection, then measurement reliability is improved, but response speed deteriorates due to the minimum frame period requirement
Solution Approach 1:
The patent segments the image into multiple scanning lines and processes each line independently with its own timer. This allows the system to detect position changes on a per-line basis rather than waiting for complete frame comparison, thereby improving response speed while maintaining measurement reliability through line-by-line verification.
Solution Approach 2:
The patent implements dynamic line-by-line processing where each scanning line is processed as it is scanned, rather than static frame-based processing. The timer for each line starts independently when scanning begins, allowing the system to adapt to position changes at any point during the scanning process, thus improving response speed without sacrificing reliability.
2Speed
If frame period is reduced for faster position change analysis, then response speed is improved, but measurement precision deteriorates due to insufficient comparison time
Solution Approach 1:
The patent divides the imaging process into multiple independent line segments, each with its own timer and comparison mechanism. This segmentation allows the system to perform precise measurements on each line individually while aggregating results across lines, achieving both fast response and high precision without requiring a reduced frame period.
Solution Approach 2:
The patent uses a feedback mechanism where the timer for each line is reset based on the detection results of previous lines. When a position change is detected, the system can adjust subsequent line processing timing, ensuring that measurement precision is maintained while optimizing the overall response speed through adaptive feedback control.
3Speed
If line-by-line inter-frame difference analysis is implemented, then response speed is improved, but device complexity increases due to multiple timers and processing logic
Solution Approach 1:
The patent implements a universal timer and processing logic that serves multiple functions: it tracks position changes for each line, manages the scanning process, and controls the detection algorithm. This multi-functional design reduces the need for separate dedicated components for each line, thereby improving response speed while minimizing the increase in device complexity through resource sharing.
4Speed
If position change detection is performed during imaging period, then response speed is improved, but loss of time increases due to continuous processing requirements
Solution Approach 1:
The patent employs periodic action by resetting the timer for each scanning line in a regular cycle. This periodic reset mechanism allows the system to efficiently detect position changes during the imaging period without requiring continuous processing of all lines simultaneously, thereby improving response speed while reducing overall processing time through structured periodic operations.
Data Source
AI summary
An electronic apparatus is configured to include an area sensor with a rolling shutter method and a detector configured to detect a change in a position of the area sensor, based on an inter-frame difference for each line in an image captured by the area sensor.