Endoscope Light Source Adjusting Blue Green Ratio for Vessel Visibility
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Solution Overview
Problem
In endoscope systems using complementary color type imaging devices for narrowband light observation, there is a challenge in achieving high color separability and visibility of superficial blood vessels due to the mixing of blue and green narrowband lights, which results in low color separability and blurred images.
Innovation Solution
The endoscope system includes a complementary color type imaging device with a signal processing unit and a lighting section that adjusts the light amount ratio between blue and green narrowband lights, ensuring the blue light has a higher intensity than the green light, and uses a matrix operation to correct signal values, thereby improving color separability and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If blue narrowband light and green narrowband light are simultaneously applied for narrowband light observation, then the simultaneous imaging method can prevent blur in the image and maintain structural simplicity, but the color separability deteriorates and the image becomes blurred
Solution Approach 1:
The patent applies parameter changes by adjusting the intensity ratio between blue and green narrowband lights. Specifically, the blue narrowband light intensity is set to be higher than the green narrowband light intensity, which optimizes the balance between maintaining color separability and preventing image blur during simultaneous imaging.
Solution Approach 2:
The patent implements dynamics by enabling dynamic adjustment of the light amount ratio between blue and green narrowband lights based on the type of imaging device (complementary color type or primary color type). This allows the system to adapt to different imaging requirements and optimize performance for each device type.
2Reliability
If complementary color type imaging device is used for narrowband light observation, then sensitivity is improved, but color separability deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the light amount ratio between blue and green narrowband lights specifically for complementary color type imaging devices. The blue light intensity is set higher than green light intensity to compensate for the lower color separability inherent in complementary color type devices, thereby maintaining diagnostic accuracy.
Solution Approach 2:
The system dynamically adjusts illumination parameters based on the detected imaging device type. When a complementary color type imaging device is detected, the controller specifically sets the blue narrowband light intensity higher than green narrowband light intensity, optimizing the balance between sensitivity and color separability for this device type.
3Measurement precision
If light amount ratio between blue and green narrowband lights is not optimized, then the signal values from mixed pixels become unbalanced, but optimizing the ratio improves color separability and visibility of superficial blood vessels
Solution Approach 1:
The patent applies parameter changes by optimizing the light amount ratio between blue and green narrowband lights to achieve balanced signal values from mixed pixels. This parameter optimization improves color separability and visibility of superficial blood vessels while managing signal processing complexity through systematic adjustment rather than complex computation.
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
This approach enhances the color separability and visibility of superficial blood vessels by optimizing the light ratio and signal processing, leading to clearer images of blood vessels and mucosa membranes.
Implementation Method 1
a complementary color type imaging device having complementary color filters, in which four types of pixels of magenta (Mg), green (G), cyan (Cy), and yellow (Ye) are arranged in a checkered pattern
Implementation Method 2
a light source device that simultaneously applies the first and second narrowband light to an observation object
Implementation Method 3
The narrowband light observation uses two types of narrowband light absorbable by hemoglobin in blood, that is, blue narrowband light having a center wavelength in the vicinity of 415 nm and green narrowband light having a center wavelength in the vicinity of 540 nm
Data Source
AI summary
Violet narrowband light Vn and green narrowband light Gn produced by a light source device are supplied to a complementary color type endoscope, and simultaneously applied to an observation object. In a complementary color type imaging device, first mixed pixels and second mixed pixels, which sense both of the violet narrowband light Vn and the green narrowband light Gn, are read out. The light amount ratio Z of the violet narrowband light Vn to the green narrowband light Gn is set in such a range as to make the light amount of the violet narrowband light Vn larger than the light amount of the green narrowband light Gn, and make a signal value of the second mixed pixel higher than a signal value of the first mixed pixel.