RGB-IR Sensor IR Crosstalk Compensation Circuit
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Solution Overview
Problem
Conventional image compensation techniques for RGB-IR sensors fail to accurately address IR crosstalk, leading to color shifting and over-compensation issues, especially in environments with high IR light levels like sunlight or halogen lamps, resulting in inaccurate color representation.
Innovation Solution
An image adjustment method and circuit that detects over-compensation areas by calculating an over-compensation parameter and adjusting compensation coefficients based on threshold values to prevent IR crosstalk over-compensation, allowing for precise color correction by applying different adjustment parameters to affected areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IR crosstalk compensation is performed by deducting a fixed proportion of IR value from R, G, B values, then some compensation effect is achieved, but over-compensation and color distortion occur when IR_ori is too large
Solution Approach 1:
The patent applies dynamics by making the compensation coefficient adaptive rather than fixed. The coefficient is dynamically adjusted based on the ratio of IR component to RGB component in the image, allowing the compensation strength to vary with lighting conditions. This resolves the contradiction by preventing over-compensation in high-IR environments while maintaining effective compensation in normal conditions.
Solution Approach 2:
The patent changes the parameter of compensation coefficient from a fixed constant to a variable parameter that depends on the IR/RGB ratio. By modifying this key parameter based on actual image content and lighting conditions, the system achieves both accurate color representation and stable compensation performance across different environments.
2Ease of operation
If fixed compensation coefficients are used for all lighting conditions, then the compensation method is simple, but color shifting occurs in environments with high IR content such as sunlight or halogen lamps
Solution Approach 1:
The system performs self-adjustment by automatically calculating the appropriate compensation coefficient based on the IR/RGB ratio detected in the image. No manual intervention or pre-programming for different lighting conditions is needed - the system serves itself by adapting to the actual environmental conditions, thus maintaining simplicity while improving accuracy.
Solution Approach 2:
The patent implements feedback by using the detected IR component level to adjust the compensation coefficient. The system continuously monitors the IR/RGB ratio and uses this feedback information to modulate the compensation strength, creating a closed-loop control that maintains color accuracy across varying lighting conditions.
3Stability of the object's composition
If no IR crosstalk compensation is applied, then color representation remains unchanged, but IR light causes color washout and shifting in the captured image
Solution Approach 1:
The patent applies preliminary anti-action by proactively compensating for the harmful IR crosstalk effect before it causes significant color distortion. The compensation is applied in the image processing stage, counteracting the physical crosstalk that occurred during sensor capture. This prevents the harmful effect from manifesting as visible color washing or shifting in the final image.
Data Source
AI summary
The present invention provides an image adjustment method and associated image processing circuit for performing the following operations upon each pixel of an image: obtaining R, G, B values and infrared ray (IR) value corresponding to the current pixel; generating multiple initial compensation parameters corresponding to the R, G, B values; generating an over-compensation parameter according to the R, G, B and IR values; comparing the over-compensation parameter with at least one threshold value to generate a compensation adjustment coefficient; and performing IR crosstalk compensation upon the image with the compensation adjustment coefficient.