As a result, this enhances the image, providing more details in low-lighting environments. Security camera sensors transmit optoelectronic signals linearly, although the human eye senses light non-linearly. By adjusting the gamma curve to a non-linear configuration, Hikvision DarkFighter security cameras alter the image signal so it is more similar to how the human eye senses light. When the focal length is adjusted, the aperture retains the same value, and the image remains just as bright.Ĭonstant Aperture: Conventional Camera vs DarkFighter Camera as Focal Length is Adjusted Self-Adaptive Image Signal Processing (ISP) Technologies However, Hikvision ensures this isn't the case with a constant large aperture. When the focal length is increased in varifocal lenses, the aperture typically decreases, degrading image quality. However, with a large aperture (right), the image is bright, clear and easy to interpret.įootage Comparing f/1.5 Lens (left) and f/0.95 Lens (right) As shown below, the footage with a smaller aperture (left) is dark and few details can be seen. To ensure the captured footage is bright and detailed with very little noise, Hikvision has utilised an ultra-large aperture. This improves IR performance and footage quality while preventing stray lights and halo-effects from influencing the image. The surface of the DarkEye lens is coated with multiple layers of anti-reflection coating. As the aspherical lens has a free-form surface, the lens improves light transmittance, and consequently, enhances image brightness at night. The DarkFighter lens employs an aspherical lens shape, which effectively reduces image aberration present in conventional cameras with a spherical lens. Hikvision achieves this by modifying the order of the photosensitive layer and metal layer within the sensor, resulting in decreased light reflection and increased light usage. Single Pixel Area: Conventional Camera (left) vs DarkFighter Camera (right)ĭarkFighter cameras also have a backside illuminated sensor, which improves brightness by 30%. To further enhance low-light performance and improve light passing quantity, the sensor's single-pixel area is nearly double the size of a normal sensor.

Hikvision specifically designed their sensor to have an extremely high quality, as well as a high S/N ratio and increased Wide Dynamic Range (WDR). Similarly, if a high-quality sensor is used, the image will be of extremely high quality. If a low-quality sensor is used, a poor image will be produced. In a surveillance camera, the quality of the sensor determines the quality of the captured image, especially in low light conditions. The security of your premises, whether that's your home or business, is of the utmost importance, at both day and night.įortunately, this detrimental problem has been solved by Hikvision's range of ultra low-light cameras with DarkFighter technology. Poor image quality in low light environments is a common and recurring problem many have faced. This problem can be the cause of major concerns, especially as the most crime happens at night.

Hikvision 2135 darkfighter