Target Setting Apparatus for Sight Line Detection Error Correction
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Solution Overview
Problem
Existing target setting apparatuses for correcting sight line detection portions struggle to properly set targets in non-standard screen patterns and may incorrectly detect sight lines when the subject person looks outside the intended area.
Innovation Solution
A target setting apparatus that includes a sight line range estimation portion, candidate point extraction portion, and candidate point evaluation portion to evaluate candidate points using multiple indices, ensuring accurate target setting irrespective of the image presented to the subject person.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a target is set at the center of a cursor displayed on a predetermined portion of the input dialog screen, then the target setting is simple and follows a standard pattern, but the target cannot be properly set when the screen has a non-standard pattern or array that was not initially imagined by the device designer
Solution Approach 1:
The device automatically determines the sight line range and extracts candidate points without requiring manual configuration or designer intervention. The system self-adjusts to different screen patterns by autonomously analyzing the display content and selecting appropriate target positions, eliminating the need for predetermined design assumptions.
Solution Approach 2:
The system dynamically changes the target position parameters based on the actual screen content and sight line detection data. Instead of using a fixed predetermined position, the target coordinates are adjusted according to the extracted candidate points and their evaluation results, allowing adaptation to various screen layouts.
2Measurement precision
If the sight line detection portion estimates the sight line of the subject person, then the device can detect where the subject is looking, but the device may incorrectly detect the sight line when the subject person is looking at the outside rather than at the screen
Solution Approach 1:
The sight line detection is segmented into two components: the raw sight line direction from the eye tracker and the screen content context. By separating these elements, the system can evaluate whether the detected sight line corresponds to a meaningful target on the screen or if the subject is looking outside the relevant area.
Solution Approach 2:
The candidate point evaluation portion acts as an intermediary that mediates between the raw sight line detection and the final target selection. It evaluates whether the detected sight line direction corresponds to a valid candidate point on the screen, filtering out incorrect detections when the subject looks outside the screen area.
3Adaptability or versatility
If multiple candidate points are extracted and evaluated using multiple indices, then the target can be properly set for various screen patterns, but the device complexity increases
Solution Approach 1:
The system extracts multiple candidate points and evaluates them using multiple indices, but only selects the single best candidate as the final target. This partial action approach allows comprehensive evaluation without implementing all possible processing steps, balancing thoroughness with efficiency.
Solution Approach 2:
The candidate point evaluation portion uses multiple indices (distance, brightness, position) that can universally evaluate any candidate point regardless of the specific screen pattern. This multi-functional evaluation approach handles various screen layouts with a single unified system rather than requiring separate processing for each pattern type.
Data Source
AI summary
A target setting apparatus sets a target correcting a sight line detection portion to detect a sight line of a subject person. A deviation between a position of the target and a position detected as a center of the sight line detected by the sight line detection portion when the subject person is estimated to be gazing at the target is regarded as a detection error and applied to a correction. The target setting apparatus includes: a sight line range estimation portion that estimates a sight line range; a candidate point extraction portion that extracts a candidate point for the target from the sight line range; a candidate point evaluation portion that evaluates appropriateness of the candidate point as the target by using a plurality of indices; and a target setting portion that determines whether or not to set the candidate point as the target.