Why does the infrared waterproof camera appear to flicker? As previously explained, when the ambient light level drops below a certain threshold, the infrared (IR) lamp turns on. When the light level rises above that threshold, the IR lamp turns off. Now, consider a scenario where the ambient light is just slightly below the threshold: the photosensitive sensor detects this and triggers the IR lamp to turn on, emitting infrared light. However, once the IR light is emitted, the reflected infrared light increases the detected illumination level. This may push it above the threshold, causing the IR lamp to turn off again. As the light level drops back below the threshold, the process repeats—resulting in continuous on-and-off cycling of the IR lamp and causing the image to flicker.
This kind of behavior is not normal or acceptable from a quality standpoint. It can lead to several issues:
1. **Reduced lifespan of the IR lamp**: Frequent switching reduces the life of the IR LEDs.
2. **Degraded image quality**: In situations where color images could still be captured, the IR lamp turning on unnecessarily can cause color distortion or reduced clarity.
3. **Infrared "eye" effect**: This refers to bright spots appearing in the image due to the reflection of IR light, which most users find undesirable.
Most standard infrared waterproof cameras use a photosensitive element to detect ambient light levels and control the IR lamp based on a pre-set threshold. The threshold varies depending on the environment, user preferences, and design considerations. For example, thresholds might be set at 20 Lux, 10 Lux, or 5 Lux. A higher threshold means the IR lamp will activate earlier, potentially even before the camera has switched to black and white mode. This can result in three main problems: unnecessary activation, image degradation, and the infrared "eye" effect.
**So how can we solve this issue?**
There are two common scenarios where flickering occurs due to the ambient light being just slightly below the threshold:
1. **Short-term flickering in the evening**: If the problem happens only for a short period, such as during dusk, and you don't want to increase costs, the best approach is to inform the user about the cause and accept it as a minor limitation.
2. **Stable but low lighting conditions**: In such cases, the issue must be resolved. Here are some possible solutions:
- **Adjust the threshold**: Different models have different thresholds. Replacing the camera with one that has a higher threshold can reduce the likelihood of flickering.
- **Modify the installation angle**: Slight adjustments in the camera’s position can significantly change the detected light level, moving it away from the threshold range and reducing flicker.
- **Use high-quality low-light cameras with backlight compensation and anti-glare features**, especially those equipped with specialized IR lenses.
- **Avoid close-range reflections**: Objects or people near the camera can reflect IR light back to the sensor, causing fluctuations in the detected light level and leading to flickering. Ensure the camera is installed properly and avoid placing reflective objects too close to the lens.
In summary, while flickering in infrared cameras is a known issue, it can often be minimized through proper setup, threshold adjustment, and using better-quality equipment. Understanding the root cause is the first step toward solving it effectively.
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