Camera Autofocus Calibration Test Target
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Solution Overview
Problem
Photographers face challenges with the accuracy and repeatability of autofocus systems in cameras, leading to improperly focused images and potential need for costly recalibration or replacement.
Innovation Solution
A portable test target with a high-contrast pattern and ruler is used to measure and calibrate the focus performance of camera and lens combinations, allowing on-site correction and storage of calibration data for future use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If autofocus systems are used for automatic focusing, then shooting speed and convenience are improved, but focus accuracy and repeatability deteriorate
Solution Approach 1:
The patent enables photographers to perform autofocus calibration themselves using a portable test target and camera, eliminating the need for professional service centers. The system provides self-diagnosis and self-correction capabilities through automated measurement of focus accuracy using the test target patterns and ruler, allowing users to identify and correct calibration issues independently.
2Measurement precision
If professional recalibration service is sought for autofocus issues, then focus accuracy may be improved, but time and cost increase
Solution Approach 1:
The patent enables photographers to perform preventive autofocus calibration checks and corrections at any time using the portable test target, before problems escalate or during regular maintenance. This preliminary self-calibration capability eliminates the need for time-consuming trips to service centers and reduces wait times associated with professional recalibration scheduling and execution.
3Measurement precision
If professional recalibration service is sought for autofocus issues, then focus accuracy may be improved, but cost increases
Solution Approach 1:
The patent employs a simple, inexpensive portable test target that can be easily manufactured and replaced if needed, eliminating the requirement for expensive professional calibration equipment and services. The test target uses basic visual patterns and ruler markings that can be produced at minimal cost, making accurate autofocus calibration accessible to all photographers regardless of budget.
4Ease of operation
If built-in autofocus systems are used, then automatic focusing convenience is improved, but reliability of focus performance deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where photographers can regularly test their autofocus system using the portable test target, obtain quantitative measurements of focus accuracy, and make adjustments as needed. This continuous monitoring and adjustment process ensures that the automated autofocus system maintains high reliability over time, with users able to detect and correct drift or degradation in focus performance.
Data Source
AI summary
In one embodiment, the present invention is a method and apparatus for measuring the focus performance of a camera and lens combination. One embodiment of a test target for measuring a focus performance of a camera and lens combination includes a target body, the target body displaying a pattern including: a primary pattern covering a portion of the target body and a secondary pattern superimposed over a portion of the primary pattern, the secondary pattern being aligned along an edge of the target body. The test target also includes a ruler positioned adjacent to the edge of the target body, a ruler positioned adjacent to the edge of the target body, such that the secondary pattern directly abuts a zero line of the ruler.