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Smart IR II

Highly Uniform, Consistent Brightness and the Clearest Night Views Ever

Vari-Angle IR : Automatic IR angle adjustment with the optical zoom provides consistent IR images in all fields of view.

Adaptive IR : The best possible IR image via IR illuminator adjustment to suit the scene (simultaneously or individually).

What is Smart IR II?

Naturally, light is fundamental in determining image quality. Featuring a unique optical design, robust light level calculation, and proprietary image processing, VIVOTEK's Smart IR Generation II Technology (hereinafter called “Smart IR II”) enhances image quality and light performance in security applications and provides clear and uniform night-time images even under severe lighting conditions.

Underpinning and enabling VIVOTEK’s Smart IR II lie two fundamental technologies, Vari-Angle IR (VAIR) and Adaptive IR (ADIR).

How Does Vari-Angle Infrared work?

When natural or artificial light is not available, IR illuminators are often used to enhance black and white night time images. Conventional IR illumination only covers a fixed general area. However for long range PTZ surveillance, this limits the distance of the camera's capable scope. VIVOTEK's VAIR function supported on VIVOTEK's IR Speed Dome surveillance cameras provides efficient, uniform IR lighting intensity. The products with the VIVOTEK VAIR function feature varifocal IR illumination and allow users to automatically adjust the IR angle to match the camera lens' FOV. In the scene below, the left image has fixed IR illumination and demonstrates the object is blurred and unrecognizable. In contrast, the right image with VIVOTEK VAIR identifies the object in the infrared region as the illumination angles vary to adjust match the lens FOV.

Why Use Smart IR II?

Vari-Angle IR (VAIR)

VIVOTEK's Vari-Angle IR products are designed with secondary optical lenses to verify the focal length based on the lens settings in order to match and optimize light detection with the field of view. Network cameras equipped with Vari-Angle IR are an ideal choice for customers who require the ability to clearly capture video images in complete darkness and to detect previously invisible objects in a broad coverage FOV with IR illumination.

Adaptive IR (ADIR)

VIVOTEK’s network cameras with Adaptive IR feature provide regional-controlled LED technology to improve image quality and brightness. Through advanced optical design, regional control and image-analysis-technology assisted brightness control, these cameras provide vivid imagery during nighttime surveillance. They are an ideal option for users who require clear imagery of completely dark scenes.

For example, when a large, immovable object (such as a wall surface) is installed in a surveillance environment, there may occur image degrading due to the IR reflection when a conventional IR camera is used. By adopting VIVOTEK’s Adaptive IR technology, this can be avoided by automatically controlling the regional IR setting to increase visibility, as shown below.

Smart IR II before and after

How Does Smart IR II work?

Vari-Angle IR (VAIR)

When natural or artificial light is not available, IR illuminators are often used to enhance black and white night time images. However conventional IR illumination only covers a fixed illumination area. When it is necessary to cover a field of view at a greater distance, such stationary IR is limited. Overcoming this limitation, the Vari-Angle IR function on VIVOTEK's cameras are equipped with range adaptive IR which auto adjust the IR angles to precisely match the camera’s FOV without creating a hot-spot side effect.

Adaptive IR (ADIR)

When a subject (e.g. an intruder) approaches the camera, excessive IR illumination can cause over-exposure, and render an image unusable. By automatically dimming lighting on a near subject, we avoid over-illumination while ensuring consistent overall brightness and clarity of all background detail.


Vari-Angle IR (VAIR)

Video surveillance requires a certain lux level of lighting to capture effective video images and in order to reliably detect people or objects. IR illumination is often used in poor lighting scenarios. Deploying the Vari-Angle IR function on enabled network cameras will match the IR illumination to the camera's lens angle. The optical zoom on VIVOTEK's speed dome network cameras enable users to magnify their FOV with the performance of different IR illumination angles. The following table details the mapping between the optical zoom and the corresponding IR angle.

Zoom IR Angle Zoom IR Angle
1 x 63.7 16x 4.49
2x 34.86 17x 4.23
3x 23.64 18x 4
4x 17.84 19x 3.96
5x 14.32 20x 3.92
6x 11.95 21x 3.88
7x 10.25 22x 3.84
8x 8.98 23x 3.8
9x 7.98 24x 3.76
10x 7.19 25x 3.72
11x 6.53 26x 3.68
12x 5.99 27x 3.64
13x 5.53 28x 3.6
14x 5.14 29x 3.56
15x 4.79 30x 3.52

Adaptive IR (ADIR)

VIVOTEK's patented Adaptive IR Technology is designed with intelligence and control in mind. Adaptive IR divides image planes into multiple sections, with each section equipped with an independent IR control lighting device for regional illumination. This process ensures the retention of comprehensive details of any approaching subject while preserving clarity of the background image.



VIVOTEK's Smart IR II Technology is an optical enhancement designed to empower users to view desired objects and capture video images with clear, identifiable detail in total darkness or at night. In low-light environments, it is necessary to utilize Smart IR II Technology to produce usable image quality. With VIVOTEK’s Smart IR II Technology, low-light no longer means low-vision.

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