Automatic Focus on Target Object via Feature Comparison
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Solution Overview
Problem
Existing photographic technologies cannot automatically focus on a specific movable object in dynamic scenarios, often capturing the background instead of the intended subject, leading to unwanted out-of-focus images.
Innovation Solution
A method and apparatus that capture and process reference images of the target object before photography, allowing for automatic focus by comparing real-time images with stored features to identify and focus on the target object upon pressing the photographing button.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If existing face detection technology is used to detect all characters in the field of view, then face detection capability is improved, but the ability to distinguish the desired main character from background characters deteriorates
Solution Approach 1:
The system performs preliminary actions by capturing reference images of the target object before actual photographing, extracting features from these reference images, and storing them for later comparison. This preliminary feature extraction and storage enables the system to quickly identify the specific target character among multiple detected faces during dynamic photographing, resolving the contradiction between detecting all characters and identifying the specific target.
2Measurement precision
If manual focus adjustment is used in static photographing, then focus accuracy is improved, but photographing efficiency deteriorates
Solution Approach 1:
The system implements self-service by automatically adjusting the lens focus based on the identified target object's position in the captured image. The processing circuit automatically determines the image area containing the target object and controls the lens to focus on that area, eliminating the need for manual focus adjustment while maintaining focus accuracy. This resolves the contradiction between focus accuracy and photographing efficiency.
3Productivity
If automatic focus is implemented without target identification, then photographing speed is improved, but focus accuracy on the desired target deteriorates
Solution Approach 1:
The system implements feedback by comparing the captured image with pre-stored reference image features to identify the target object's position, then using this identification information to control the lens focus. The comparison result provides feedback about where the target is located, enabling the automatic focus system to accurately focus on the desired target rather than just any object in the field of view. This resolves the contradiction between photographing speed and focus accuracy on the desired target.
Data Source
AI summary
A method capable of performing an automatic focus function upon a specific movable object in a real-time manner, the method being applicable to a photographic apparatus with the automatic focus function, includes: capturing real-time image within a field of view (FOV) of a lens; comparing images of a plurality of image areas of the real-time image with a feature image of the specific movable object to identify an image area corresponding to the feature image of the specific movable object; and, performing automatic focus on the identified image area.