Dual Camera Focal Length Determination for Fast Image Capture
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Solution Overview
Problem
Conventional methods for focusing on objects using electronic devices with lenses are inefficient due to long in-focus times and errors in determining the best focal length, leading to unclear images.
Innovation Solution
A portable electronic device equipped with two camera modules of different focal lengths, where one camera module captures a reference image at a predetermined focal length and the other at a second focal length, allowing the processing unit to determine the optimal focal length for accurate image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional focusing method using motor to move lens is used, then the device can capture images, but the in-focus time is too long and the object may be out of focus
Solution Approach 1:
The patent captures reference images at multiple predetermined focal lengths before actual photography. The processing unit analyzes these reference images in advance to determine the optimal focal length for the object, eliminating the need for time-consuming motor-driven lens adjustment during the actual shooting moment.
Solution Approach 2:
The patent replaces the mechanical motor-driven lens movement system with a computational approach. Instead of physically moving the lens to find the correct focal length, the system uses image processing algorithms to analyze reference images and calculate the optimal focal length, significantly reducing focusing time.
2Measurement precision
If conventional focusing method is used, then the device can take photos, but the results are affected by errors and objects may be out of focus
Solution Approach 1:
The patent uses reference images captured at multiple focal lengths as feedback to determine the optimal focal length. The processing unit analyzes clarity metrics and other focus indicators from these reference images to identify which focal length produces the sharpest image, thereby improving focus reliability.
Solution Approach 2:
By capturing and analyzing reference images before actual photography, the system determines the correct focal length in advance. This preliminary analysis ensures that when the actual photo is taken, the focal length is already optimized, eliminating focus errors.
Data Source
AI summary
A portable electronic-device adapted to photograph an object including a first camera module, a second camera module, a processing unit and a control unit. The first camera module obtains a first reference image according to a first predetermined focal length. The second camera module obtains a second reference image according to a second predetermined focal length. The processing unit determines the photographed focal length according to the first reference image and the second reference image. The control unit controls the first camera module or the second camera module to photograph the object according to the photographed focal length. The first camera module and the second camera module face toward a direction corresponding to the object.