DRI in Video Surveillance

DRI in Video Surveillance

Wish you a very happy new year 2018. In today’s competitive environment, having new customers constantly is one of the keys of success. To make professional quotes with proper sketches, realistic test objects, 3D images, mock ups etc, which leave a lasting impression on your clients.

When you are answering queries related to your product, you can quickly glance through the details while your client is on call.

DRI stands for Detection, Recognition and Identification in video surveillance. DRI ranges, expressed in meters, km (or miles), can be found in the specification table of infrared camera brochures. In order to select the right sensor meeting the application requirements, these DRI ranges have to be, first, perfectly defined, but also assessed with regards to globally adopted industrial standards.

DRI Definition

The terms “Detection”, “Recognition” and “Identification” were defined as follow:

• Detection: ability to distinguish an object from the background
• Recognition: ability to classify the object class (animal, human, vehicle, boat …)
• Identification: ability to describe the object in details (a man with a hat, a deer, a Jeep …)

The following pictures illustrate these definitions:

    Left image: Detection – At several kms, 2 targets are detected out of the background 

    Center image: Recognition - a human is walking along the fence 

    Right image: Identification – 2 males with trousers and jackets are identified – one is smoking.

We detect an object when it enters the field of view. Detection means we are aware that an object (or person) now exists where previously it was not seen. Usually, this is due to movement of the object into the field of view of the surveillance camera. Detection simply means we are aware of the object, but have too little details to recognize or identify the object.

As the object moves closer, we may recognize the object from characteristics previously encountered. For example, aircraft recognition is taught to military ground troops and airmen. All aircraft have wings, engines, a fuselage, and tail assembly. They differ in size, shape, number, and position to each other. A particular model of aircraft can be recognized by recalling these characteristics from pictures, drawings or past detailed observations.

Identification is the process where sufficient details are available to uniquely discern a person or object that is previously unknown. Identification requires sufficient detail to accurately describe or recall the characteristics of the subject at a later time. For example, a mug shot (booking photograph) is taken following the arrest of a subject as a means of photographing (recording) sufficient details for later identification by a victim or witness. In video surveillance terms, sufficient detail is calibrated in pixels per foot of the area recorded by the camera.

DRI Ranges

“A picture is worth a thousand words” goes the old and equally wise saying. It is true that most human beings learn much quicker when aided by visuals rather than pure text as that is more in tune with the human psychology of learning.

So instead of remembering commands and functions you will easily remember that yellow color indicates areas where it is possible to recognize people, red color indicates areas suitable for people identification, green areas for detection and so forth.

To put this in perspective, sensors have a resolution of 640×480 which is over 300,000 pixels.
Human “detection” only requires 3.6 of those pixels and “identification” only requires 230 pixels, which is an extraordinarily small amount on the screen that can easily go unnoticed by the human eye. In fact, if this page were the size of your video feed, the area required for a human detection rating is about equivalent to a lowercase letter “i” in this text. The amount of detail visible at the detection, recognition and identification distances is not as high as one might expect, as can be seen in the chart below.

Another thing that is often not mentioned is that these ratings are based on what is termed “ideal conditions” which rarely happen in the real world. The average environmental application will get 25% less than the distance that the thermal camera is rated for and in extreme conditions can be less than 10% of the rated distance.

Based on SR-100 & SR-100P by FLIR the approximate DRI (Detection, Recognition and Identification) range for a vehicle and a human target is listed in Tables 1 & 2.

Lens	Detection	Recognition	Identification
100mm	4.4km	1.1km	580m

Table 1: DRI range for Vehicle with 2.3m critical dimension using a Thermal Security Camera with 38 micron pitch detector

Lens	Detection	Recognition	Identification
100mm	1.6km	400m	200m

Table 2: DRI range for Human Target using a Thermal Security Camera with 38 micron pitch detector

Assumptions:  50% probability of achieving objective at the specified distance given a   2-degree temperature difference and 0.85/km atmospheric attenuation factor.  Actual range may vary depending on camera setup, user experience, environmental conditions, and type of monitor or display used.

Each & every Camera has this DRI ranges, before preparing project oriented ppt, do confirm the ranges & show in a slide with sketch.

Artical publish at safe secure magazine January 2018 issue.

Warrior 2.0 26BF2 is a 1080P 2MP Fixed Lens Mini Bullet Camera

Detect: 100 ft
Recognize: 50 ft
Identify: 25 ft

Laser 2.0 - 26ZV-LIR is a 2MP (1080P) IP PTZ Camera with 33x Optical Zoom & Laser Infrared camera and Spotlight 2.0 - 26ZV-W is a 2MP (1080P) IP PTZ Camera with 22x Optical Zoom & Full Spectrum Light Camera

Detect: 950 ft
Recognize: 875 ft
Identify: 750 ft

Lookout 2.0 - 26ZV is a 2MP (1080P) IP PTZ Camera with 30x Optical Zoom Camera

Detect: 1000 ft
Recognize: 900 ft
Identify: 800 ft

Judge 8.0 - 26DV8 is a 4K (8MP - 4x1080P) Multi-Purpose Lens Dome Camera with Motorized Zoom and IK10 Camera and Gladiator 8.0 - 26BV8 is a 4K (8MP - 4x1080P) Multi-Purpose Lens Bullet Camera with Motorized Zoom and P-Iris Camera

Detect: up to 200 ft
Recognize: up to 150 ft
Identify: up to 100 ft

Deputy 4.0 - 26DF4 - 4MP (2x1080P) Fixed Wide Angle Lens Turret Dome Camera

Detect: 115 ft
Recognize: 50 ft
Identify: 35 ft

Archer 2.0 - 26BV2-L - 2MP Long Range, Low Light Bullet Camera with Motorized Zoom and Focus

Detect: up to 450 ft
Recognize: up to 350 ft
Identify: up to 300 ft

Warrior 4.0 - 26BF4 is a 4MP (2x1080P) Fixed Lens Mini Bullet Camera

Detect: 150 ft

Recognize: 75 ft
Identify: 50 ft