3D Endoscope Image Brightness Equalization
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Solution Overview
Problem
Conventional three-dimensional endoscopes with two image pickup units face challenges in maintaining appropriate brightness across images with parallax, leading to deviations in luminance values, especially at the ends of the field-of-view, which affects exposure control and image quality.
Innovation Solution
An image pickup system and signal processing apparatus that define common areas in both images, detect brightness within these areas, and adjust exposure accordingly to equalize luminance values between the images, using a processor to control the image pickup units and light source for optimal illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two image pickup units are used to capture images with parallax for three-dimensional imaging, then the ability to generate three-dimensional images is improved, but brightness uniformity and luminance consistency between the two images deteriorate
Solution Approach 1:
The patent applies local quality by performing separate exposure control for each image pickup unit based on local brightness measurements. The exposure control unit adjusts exposure parameters independently for each imaging unit according to the brightness of its respective captured image, allowing each unit to optimize its exposure locally rather than using a uniform global setting, thereby achieving brightness uniformity across both images while maintaining their parallax relationship for 3D generation
Solution Approach 2:
The patent implements feedback by measuring the brightness of images captured by each image pickup unit and using this measurement to adjust exposure parameters. The exposure control unit receives brightness information from the image pickup units and automatically adjusts exposure settings based on this feedback, creating a closed-loop control system that maintains luminance consistency between the two images with parallax
2Device complexity
If a single light source apparatus is used to illuminate the object, then the device complexity is reduced, but the ability to independently adjust illumination for each image pickup unit is limited
Solution Approach 1:
The patent applies segmentation by dividing the illumination control into separate channels for each image pickup unit. Even though a single light source apparatus is used, the system segments the light control function by providing independent light adjustment means for each imaging unit, allowing each to receive independently adjusted illumination. This segmentation enables independent exposure control for each unit while sharing the common light source infrastructure
Solution Approach 2:
The patent implements universality by designing the light source apparatus to serve multiple functions. The single light source apparatus provides illumination for both image pickup units simultaneously, while the independent light adjustment means allow the same light source to be independently controlled for each unit. This multi-functional design reduces overall device complexity while maintaining independent adjustment capability
3Ease of operation
If exposure control is performed based on overall image brightness, then the control simplicity is maintained, but the accuracy of exposure adjustment at different field-of-view positions deteriorates
Solution Approach 1:
The patent applies local quality by measuring brightness at specific local positions within the field of view rather than using overall image brightness. The system defines measurement regions and performs photometry at these localized areas, allowing exposure control to be based on local brightness characteristics. This approach maintains operational simplicity while significantly improving brightness measurement accuracy for exposure adjustment
Solution Approach 2:
The patent implements preliminary action by pre-defining measurement regions and positions for brightness photometry before actual image capture. The system establishes predetermined areas where brightness will be measured, and uses these pre-planned measurement points to guide exposure control. This preliminary setup simplifies the control process while ensuring accurate brightness measurement at critical field-of-view positions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures appropriate exposure control and uniform brightness across images with parallax, even with significant deviations in luminance values, enhancing the quality of three-dimensional images generated by the endoscope system.
Implementation Method 1
a first image pickup unit configured to pick up an optical image of an object and generate a first image pickup signal representing a first image; and a second image pickup unit configured to pick up an optical image of the object and generate a second image pickup signal representing a second image
Data Source
AI summary
An image pickup system includes: a camera including a first image pickup unit and a second image pickup unit; and a processor configured to: define a first common area in a first image and a second common area in a second image, respectively; detect brightness of an image in the first common area; detect brightness of an image in the second common area; adjust brightness of the first image based on the brightness of the image in the first common area; and adjust brightness of the second image based on the brightness of the image in the second common area.