The night vision effect of the infrared USB camera module mainly depends on its infrared technology, sensor performance, lens design and image processing capabilities. The following is a specific analysis:
The principle of infrared technology: Infrared light is light that the human eye cannot see, but the sensor of a camera can capture this light and convert it into an image. At night or in a dimly lit environment, the camera will automatically activate the infrared night vision function. It emits infrared light through the built-in infrared LED to illuminate the object and then receives the reflected infrared light signal for imaging. Since infrared light is not affected by ambient light, clear images can be obtained even in a completely dark environment.
Sensor performance: High-sensitivity image sensors can capture more light in low light conditions and convert it into electrical signals, thereby enhancing night vision effects. For instance, some advanced CMOS sensors have a larger light-sensitive area and higher quantum efficiency, and are capable of providing clear images under extremely low lighting conditions.
Lens design: The design of the lens also has a significant impact on the night vision effect. A lens with a large aperture can increase the amount of light entering and enhance the camera’s light sensitivity in low-light environments. Meanwhile, the optical performance of the lens also needs to be optimized to reduce the loss and distortion of light during transmission.
Image processing capability: The image enhancement and noise reduction algorithms integrated in the camera module can perform real-time processing on the collected images, reduce noise interference, and enhance image details and contrast. In night vision mode, these algorithms are particularly important because they can enhance the clarity and recognizability of the images.
Infrared lamp performance: The effective distance, quantity and power of infrared lamps will all affect the night vision effect. Some high-end infrared USB camera modules adopt imported leds, featuring a longer night vision distance and better night vision effect. At the same time, the Angle and layout of the infrared lamps also need to be optimized to ensure uniform light distribution and reduce the flashlight effect.