How does the medical endoscope camera image? What is the influence of the electronic medical endoscope camera on the imaging? The electronic endoscope hole probe image is often affected by noise and is not clear enough. There are many reasons for noise, such as internal noise of sensitive components, photosensitive Particle noise of materials, thermal noise, jitter noise caused by relative motion, interference noise of transmission channel, quantization noise, etc. Reflected on the image, the noise makes the originally uniform and continuously changing gray scale suddenly increase or decrease, forming some isolated points and false edges, and sometimes even submerging the features, which brings a lot of difficulties to the analysis. The cause of noise determines the distribution characteristics of noise and its relationship with the image signal.
How to calibrate the medical endoscope camera?
The medical endoscope camera is very delicate, and regular performance inspection is very necessary. This performance inspection is called calibration. Medical monitors are expensive compared to ordinary monitors, but also because of their high calibration requirements. There are two main calibration methods for medical monitors: external and built-in, and built-in is divided into front-mounted and rear-mounted. Endoscopic minimally invasive surgery has a small wound area, less blood loss, avoids excessive exposure of body tissues, and reduces the possibility of surgical infection; patients suffer less pain, some operations can be performed under drug analgesia, and patients can complete the surgery in an awake state treat.
Medical endoscope camera calibration, strictly speaking, should be to calibrate the "display effect" of the monitor through the "display link". Its purpose is to maintain the standardization and consistency of digital image display. The object of calibration is mainly the brightness value of each pixel on the display (usually ftL is the number of foot lumens), followed by spatial distortion (such as drawing a straight line and displaying a curve, drawing a square and displaying a rectangle or trapezoid). The key difference between medical displays and ordinary displays is the calibration of brightness values.
The brightness value of medical endoscope camera mainly calibrates three values: maximum brightness value, minimum brightness value, and linearity. To meet the above requirements in terms of parameter performance, the production volume is probably less than one millionth of that of ordinary monitors. Can the price of medical monitors be expensive? Medical monitors also have some parameters that are different from ordinary monitors.
The imaging principle of the electronic medical endoscope camera is to use the light emitted by the light source equipped in the TV information center to guide the light into the body cavity of the subject through the optical fiber in the endoscope, and the CCD image sensor receives the light reflected from the mucosal surface of the body cavity. This light is converted into electrical signals, and then the signals are sent to the TV information center through wires, and these electrical signals are stored and processed through the TV information center, and then transmitted to the TV monitor to display the detected cavity on the screen. Color mucosal images. There are two types of CCD image sensors currently used in the world, and their specific ways of forming color images are slightly different.
DSP digital processing circuit reduces signal distortion and ensures high-quality images from the electronic medical endoscope camera. Automatic white balance and excellent color adjustment function ensure the true reproduction of electronic endoscope images. The contour is enhanced, and the metering range can be adjusted as needed. The automatic electronic shutter ensures well-exposed, well-defined images in any situation. What are the useful features of medical endoscope camera?
Compared with ordinary monitors, medical endoscope cameras are more expensive. We hope the service life can be more than 5 years. Whether it's a CRT monitor or an LCD monitor, brightness will decay over time. The general definition of display life is when the brightness decays to 50% of the maximum brightness. In the case of a liquid crystal display, this time is about 30,000 hours to 50,000 hours. Even during the lifetime, the brightness is not the same every day. Therefore, after a period of time (about three months to six months), the display must be calibrated for brightness and grayscale to ensure the consistency of the display.
If after a period of time, the display quality of the same image is still the same, just like looking at the same film. Integrity means that the brightness, grayscale, contrast, etc. of the same image displayed on workstations at different locations in the hospital are the same, so that doctors in different locations see the same image; when the printed image is the same as that displayed on the medical endoscope The image on the camera is the same.
In this way, the images are the same regardless of the medium. It turns out that when the hospital uses film for diagnosis, QA (Quality Assurance) is placed on the processor. The radiology department checks the processing speed of the film processor, the concentration of the liquid medicine and the temperature every day. Make sure that each film comes out of the same quality.
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