Dental Color Reference Plate for Simultaneous Calibration
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Solution Overview
Problem
Existing color camera calibration methods require separate steps for white balance and color calibration, which complicates the process.
Innovation Solution
A color reference with color fields and white/gray fields on the same side allows for simultaneous white balance, shading correction, and color calibration by determining actual values and comparing them with target values, enabling a single-step calibration process using a transformation matrix or lookup table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color calibration and white balance are carried out in separate steps using different color reference configurations, then each calibration function can be optimized independently, but the overall calibration process becomes more complex and time-consuming
Solution Approach 1:
The patent combines color calibration fields, white balance fields, and shading correction fields into a single color reference plate. This merging allows all three calibration functions to be performed simultaneously in one step, eliminating the need for separate calibration steps and reducing overall process complexity while maintaining the precision of each individual calibration function
Solution Approach 2:
The color reference plate is designed to serve multiple functions simultaneously: color calibration, white balance, and shading correction. By making the single plate universal for all three calibration purposes, the patent eliminates the need for multiple specialized reference tools, thereby reducing device complexity and calibration time while preserving measurement precision
2Measurement precision
If color fields are arranged to cover the entire color spectrum for accurate color calibration, then color calibration precision is improved, but the calibration process time increases when performed separately from white balance
Solution Approach 1:
The patent merges color calibration, white balance, and shading correction into a single simultaneous operation using one color reference plate. This combination allows the system to perform comprehensive color spectrum calibration without the time penalty of sequential operations, as all calibration functions are executed in parallel during a single capture
3Ease of manufacture
If white fields and gray fields are positioned separately from color fields on the rear side, then white balance and shading correction can be optimized independently, but the overall calibration requires multiple steps
Solution Approach 1:
The patent positions white fields, gray fields, and color fields together on the front side of a single color reference plate, arranged in a grid pattern. This spatial merging enables the camera to capture all calibration data in one image, allowing white balance, shading correction, and color calibration to be performed simultaneously, thereby dramatically improving calibration efficiency while maintaining design flexibility
Data Source
AI summary
The invention relates to a color reference for calibrating a dental color camera comprising a plurality of fields. A surface of the color reference comprises color fields for color calibration as well as white fields and/or gray fields for a white balance and/or a shading correction.