Image Processing Apparatus Focus Adjustment via Index Value Display
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Solution Overview
Problem
In the FA field, existing focus adjustment methods using test patterns are time-consuming and impractical, and image comparison apparatuses lack the ability to adjust focus based on comparison results, making it difficult to achieve optimal imaging settings for visual sensors.
Innovation Solution
An image processing apparatus connected to an imaging system that calculates index values for evaluating imaging state, displays temporal changes, and allows users to adjust diaphragm amount and focus settings based on these values, supporting optimal imaging settings through graphical representations and determination conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If focus adjustment is performed using a test pattern, then focus accuracy can be evaluated, but time and man-hours are required for arrangement and imaging of the test pattern
Solution Approach 1:
The patent extracts the focus evaluation function from the test pattern arrangement process. Instead of requiring physical test patterns, the system uses real work images to calculate focus evaluation values, thereby eliminating the time-consuming test pattern arrangement step while maintaining focus measurement capability
Solution Approach 2:
The system enables self-service focus evaluation by automatically calculating focus evaluation values from sequentially imaged work images without requiring manual test pattern arrangement. The imaging apparatus itself provides the data needed for focus assessment through normal production imaging
2Manufacturing precision
If focus is adjusted using a test pattern, then imaging quality can be optimized, but the focus becomes improper once the object to be measured is replaced
Solution Approach 1:
The patent implements dynamic focus evaluation by continuously calculating focus evaluation values from sequentially imaged work images. This allows the system to adapt to different work objects in real-time during production, rather than relying on static test pattern-based focus settings that become obsolete when objects are replaced
Solution Approach 2:
The system changes the evaluation parameter from fixed test pattern metrics to dynamic work image-based focus evaluation values. By calculating focus evaluation values from actual work images with different objects, the system adapts to varying object characteristics while maintaining imaging quality
3Loss of information
If image comparison apparatus displays evaluation values, then image quality can be assessed, but the apparatus cannot adjust focus based on comparison results
Solution Approach 1:
The patent merges the image comparison function with the focus adjustment function into a single integrated system. The image processing apparatus both displays focus evaluation values and controls focus adjustment, eliminating the need for separate apparatus and enabling direct focus optimization based on evaluation results
Solution Approach 2:
The system implements feedback control by displaying focus evaluation values and using these values to guide focus adjustment. The operator can observe the evaluation values and adjust focus accordingly, creating a closed-loop system that continuously optimizes imaging quality
Data Source
AI summary
Provided are an image processing program and an image processing apparatus that support imaging setting in an imaging apparatus. In a focus value display window, temporal change of a focus value (index value) in an input image is outputted. A user operates the imaging apparatus with reference to graph display in the focus value display window to adjust the focus. The focus value displayed in the focus value display window indicates a relatively high value in a “focused” state to a subject such as a work. In the focus value display window, a maximum focus value indicating bar is displayed in association with a focus value indication. The user adjusts the focus state in the imaging apparatus so that the focus value indication “approaches” or “exceeds” this maximum focus value indicating bar as much as possible.