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Why does an infrared camera show "white spots and glare" at night?
Infrared cameras are widely used for night vision, but sometimes they produce strange effects like white spots or a snowy appearance. This issue can be caused by several factors.
First, poor craftsmanship can lead to uneven distribution of infrared light. When the infrared LEDs are not properly aligned or focused, the light may scatter, causing a gray or washed-out effect. Additionally, if the infrared filter is not tightly sealed, it can allow ambient light to mix with the infrared light, leading to overexposure and a whitening effect.
Second, unstable power supply can cause problems. Some outdoor systems use 12V power supplies, which might work well for short distances, but as the distance increases, heat buildup becomes an issue. If the power supply is unstable, the infrared lamps may not receive enough current, resulting in flickering or failure. Without proper heat dissipation, the lamps can burn out quickly. Also, if the current is not stable, the infrared light may not function properly, making the image look noisy or snowy.
Third, low-quality infrared components can also contribute to the problem. If the infrared light angle doesn’t match the lens’s field of view, it can result in either too narrow or too wide illumination, causing hotspots or dark areas. Some manufacturers use mixed-angle infrared LEDs to simplify installation, but this often leads to inconsistent lighting performance.
Fourth, poor circuit design is another common issue. Many low-end manufacturers use cheap electronic parts and skip important steps like circuit redesign and aging tests. Instead, they just solder the infrared LEDs directly onto the board without proper cooling or protection. Some even combine the control board with the LED board, which can cause overheating and instability, leading to poor infrared performance and snow-like noise on the screen.
Fifth, environmental factors like dust or pollution can also affect the image. In outdoor settings, fine particles that are invisible to the naked eye may reflect the infrared light, creating a grainy or snowy appearance. This is especially noticeable when the camera is operating in low-light conditions.
Lastly, some built-in cameras have high sensitivity settings that are artificially increased to make images brighter. However, if the infrared light is insufficient, the camera may amplify the signal too much, resulting in a lot of noise or snow. This is common in budget cameras where cost-cutting measures lead to lower-quality components and worse night vision performance.
In summary, the "whitening and glare" issue in infrared cameras at night can be caused by a combination of manufacturing quality, power supply stability, component compatibility, circuit design, environmental factors, and sensor sensitivity. To improve performance, it's essential to choose high-quality equipment and ensure proper installation and maintenance.