DORI stands for Detect, Observe, Recognise, Identify. The DORI distance is a “general proximity” of distance which makes it easy to pinpoint the right camera for your needs.
What is the Dori standard?
In CCTV, DORI is an acronym that stands for detection, observation, recognition, and identification. The DORI standard was made by the IEC and this defines what level of detail that a CCTV camera is able to capture. DORI is helpful in order to determine if a certain camera would be able to capture what you need.
What is Dori hikvision?
Description Hikvision DS-2CD2T45G0P-I
The DORI (detect, observe, recognize, identify) distance gives the general idea of the camera ability to distinguish persons or objects within its field of view. It is calculated based on the camera sensor specification and the criteria given by EN 62676-4: 2015.
What is Dori camera?
DORI (Detection, Observation, Recognition, Identification) How To Measure How Far a Surveillance Camera Can See?Observation 62PPM – The observation level gives characteristic details of an individual, such as distinctive clothing, while allowing a view of activity surrounding an incident.
How is Dori calculated?
Simply divide the horizontal pixels of the camera resolution by the Field Of View in feet (FOV) of the observed scene. For example, a 4-megapixel camera with 2,688 horizontal pixels used to cover a loading dock with a 100-foot FOV, pixel density would be approximately 27 PPF.
What is the difference between detection and identification?
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 …)
What is W and T in camera?
W indicates wide focal length and T indicates telephoto. For example on a 28-80mm zoom lens W is equal to 28mm and T is corresponding to 80mm.
Whats the zoom lens ratio for a PTZ camera which has 4.3 to 129mm lens?
Full HD 30x Flush PTZ Camera
| Video | |
|---|---|
| Image Sensor | 1/3″ CMOS |
| Lens Type | AF Zoom Lens |
| Focal Length | f=4.3 – 129mm |
| Aperture | F1.6 – 5.0 |
What is the closest distance a lens can focus?
The closest focusing distance of a lens (see A below) refers to the shortest distance that must be between your subject and the surface of the image sensor (the focal plane) for the lens to focus. It is not affected by the length of your length, and does not change even if you zoom your lens.
What is pixel per meter?
Pixels Per Meter is a measurement used to define the amount of potential image detail that a camera offers at a given distance.The PPM value defines the number of points or divisions for each meter of the subject that the camera is imaging. A higher PPM value means that the image has more detail capacity.
What is the difference between face recognition and detection?
Face detection refers to the identification of a person’s face or identifying if the ‘object’ captured by a camera is a person. Detection is a broader term, while recognition is more specific and falls in the category of face detection. Meaning that the computer can simply see and locate a face by knowing it is there.
What is the difference between classification and recognition?
is that classification is the act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc, according to some common relations or attributes while recognition is the act of recognizing or the condition of being recognized.
What is the difference between object detection and object recognition?
Object Recognition is responding to the question “What is the object in the image” Whereas, Object detection is answering the question “Where is that object”? Hope someone can illustrate the difference by also generously providing an example for each.
What does a 50 mm lens do?
The high speed and wide aperture of a 50mm lens can also provide shallow depth of field. This gives you huge creative scope to blur out backgrounds and focus attention on your main subject. 50mm lenses also give attractive out-of-focus highlights (also known as bokeh).
What is fisheye camera?
A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. Fisheye lenses achieve extremely wide angles of view.
What is the use of prime lens?
A filter paired with a prime lens will cut down the amount of light that reaches the sensor, allowing you to use slow shutter speeds even in daylight. This is great for recording movement in subjects such as water. It will also decrease DOF by allowing wider apertures to be used in bright light situations.
What is the range of PTZ camera?
4MP++ PTZ Camera, Camera Range: UPTO 20 KM.
What is the maximum range of PTZ camera?
These PTZ cameras provide IR illumination for night viewing at a range of up to 1,600 ft (500m).
How much distance does a PTZ camera cover?
HD sensors with long-range PTZ lenses can provide amazing clarity, even from hundreds of feet away. Check out this example of a PTZ camera with a 3 megapixel sensor and a 40X lens. It can easily capture a license plate at a distance of 650 feet (198 meters).
What is a good minimum focus distance?
Focal plane mark
It is useful to know how close your lens can be to the subject and still focus. Different lenses have different minimum focus distances. The minimum focus distance of an AF-S DX NIKKOR 18–55 mm f/3.5–5.6G VR lens is 0.28 m or 0.92 ft.
Who is responsible for pulling focus?
first assistant camera
The first assistant camera (also called the 1st assistant camera, 1st AC, first AC, or focus puller) has one main job: they sit next to the camera during filming and operate the lens’s focusing ring. The role of the focus puller is to keep the right subject in focus throughout each scene.
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