Focusing Control Device Eye Region Detection
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Solution Overview
Problem
Current imaging devices face challenges in simultaneously detecting and focusing on face and eye regions due to the complexity and time required for eye region detection, leading to potential deviation and inaccurate focusing results, especially when the subject is moving.
Innovation Solution
A focusing control device and method that includes a focusing position determination unit, face detection unit, eye detection unit, specific region determination unit, and drive unit, which image the subject through a focus lens, perform face and eye detection processing, and determine a specific region to focus on by comparing face and eye regions detected at different times to drive the focus lens to the appropriate position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If eye region detection processing is performed to enable focusing on the eye region, then focusing accuracy is improved, but processing time increases and detection reliability decreases when subject is moving
Solution Approach 1:
The system performs preliminary detection of the face region before eye region detection. By first identifying the face region and then searching for eyes within that constrained area, the system reduces the overall detection time while maintaining accurate eye region detection for focusing purposes.
Solution Approach 2:
The detection process is divided into separate stages: face region detection followed by eye region detection within the detected face region. This segmentation allows each detection task to be optimized independently, reducing total processing time while maintaining accuracy.
2Speed
If eye region detection is performed at arbitrary timing, then focusing speed is improved, but detection accuracy decreases due to subject movement
Solution Approach 1:
The face region is detected preliminarily before eye region detection at arbitrary timing. This preliminary face detection provides a stable reference frame that compensates for subject movement, allowing accurate eye region detection even when timing is arbitrary.
Solution Approach 2:
The detected face region serves as an intermediary that links the camera timing with the moving subject's eye position. By using the face region as a reference frame, the system can accurately locate eyes even when detection occurs at arbitrary moments during subject movement.
3Adaptability or versatility
If both face region and eye region detection are performed simultaneously, then comprehensive focusing control is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into a face region detection unit and an eye region detection unit that operates within the detected face region. This segmentation provides comprehensive focusing control while keeping each unit's complexity manageable through clear functional division.
Solution Approach 2:
The eye region detection is nested within the previously detected face region. This nested structure allows comprehensive detection capability while reducing overall complexity by constraining the eye detection search space within the already-identified face boundaries.
Data Source
AI summary
Disclosed are a focusing control device, an imaging device, a focusing control method, and a focusing control program capable of enabling focusing on an eye region and obtaining an intended focusing result. The focusing control device includes a focusing position determination unit 34 which determines a focusing position based on a captured image signal obtained by imaging a subject with an imaging element 5 while moving a focus lens, and an AF region determination unit 33 which determines an AF region based on a face region detected from a captured image signal obtained through imaging with the imaging element 5 at an arbitrary time and an eye region detected from a captured image signal obtained through imaging at a time before the arbitrary time. The focus lens is driven to the focusing position determined by the focusing position determination unit 34 based on a signal of the AF region.