Image Pickup Color Correction via Dimming Feedback
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Solution Overview
Problem
Image pickup apparatuses using dimming devices face challenges in maintaining constant color balance due to variations in light quantity and temperature, leading to image quality degradation.
Innovation Solution
Incorporating a color correction processing section that utilizes drive voltage and temperature information to adjust the color balance of image pickup signals, ensuring the color balance remains constant regardless of light quantity changes, achieved through a correction table correlating drive voltage and temperature with color correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dimming device is used to adjust light quantity, then light quantity control is improved, but color balance stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the control unit receives light quantity information from the dimming device, determines corresponding color correction values, and applies them to correct the image pickup signal. This closed-loop feedback system compensates for color balance shifts caused by dimming operations, resolving the contradiction between light quantity control and color balance stability.
Solution Approach 2:
The patent changes the parameter of color correction values based on the light quantity information. By storing multiple color correction values in a table and selecting the appropriate one according to the current light quantity level, the system dynamically adjusts color parameters to maintain stable color balance despite variations in illumination intensity.
2Stability of the object's composition
If color correction is performed based on light quantity information, then color balance stability is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing multiple color correction values in a table before actual image pickup. Each stored value corresponds to a specific light quantity level. During operation, the system only needs to look up the appropriate correction value based on current light quantity information, significantly reducing real-time processing complexity while maintaining color balance stability.
3Measurement precision
If a correction table correlating drive voltage and temperature is used, then color correction precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent creates a simplified copy or model of the complex relationship between drive voltage, temperature, and color correction. Instead of implementing complex real-time calculations of multiple parameters, the system stores pre-determined color correction values that represent the essential relationship. This tabular copy allows precise color correction while avoiding the manufacturing complexity of complex calculation circuits or real-time measurement systems.
Data Source
AI summary
An image pickup apparatus includes: a dimming device configured to adjust light quantity of incident image pickup light; an image pickup device configured to obtain an image pickup signal based on image pickup light emitted from the dimming device; and a color correction processing section configured to perform color correction on the image pickup signal that is obtained by the image pickup device, based on information relating to light quantity of the image pickup light emitted from the dimming device. The color correction processing section performs the color correction to allow a color balance value of the image pickup signal to be substantially constant independent of the light quantity of the image pickup light emitted from the dimming device.