Image Tracking Device Focus Detection Sequence
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Solution Overview
Problem
Existing auto focus systems cannot perform focus detection calculations efficiently during sequential shooting due to limited processing time, as they require image information for tracking the photographic subject before initiating focus detection calculations.
Innovation Solution
An image tracking device that performs first focus detection before recognizing the image position, allowing for second focus detection after recognition, and includes a controller that can execute these detections even under low luminance or extended image capture times, with options for prioritizing specific focus detection areas or modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If focus detection calculation is performed based on tracking calculation result, then focus accuracy is improved, but processing time increases and productivity decreases
Solution Approach 1:
The patent performs focus detection calculation in advance (first focus detection) before image tracking recognition is completed. This preliminary focus detection uses initial image data to calculate focus metrics, allowing the system to prepare focus information ahead of time rather than waiting for tracking to finish, thus reducing overall processing time while maintaining focus accuracy.
Solution Approach 2:
The patent divides focus detection into two separate stages: first focus detection performed before tracking recognition using initial image data, and second focus detection performed after tracking recognition using updated position information. This segmentation allows parallel processing and optimization of each stage independently, improving overall processing efficiency.
2Adaptability or versatility
If focus detection is performed for multiple focus detection positions, then focus coverage is improved, but calculation complexity increases
Solution Approach 1:
The patent applies different processing strategies to different focus detection positions based on their importance. The center focus detection position receives full processing attention with both first and second focus detection performed, while peripheral positions may use simplified processing or be processed selectively, optimizing the balance between comprehensive coverage and computational efficiency.
Data Source
AI summary
An image tracking device comprises an image pickup device that takes an image formed by an imaging optical system and outputs image information, a focus detector that detects a focusing state of the imaging optical system, a recognizer that stores reference information related to a reference image and recognizes a position of an image corresponding to the reference information, within an image corresponding to the image information, and a controller that performs first focus detection in which the focusing state is detected by the focus detector, before the position is recognized by the recognizer, and second focus detection in which the focusing state is detected for the position that has been recognized by the recognizer.