Novus 4000 series Merkblatt

Camera installation guidelines

for the proper operation of the Deep

Learning-based image analysis function

4000 series IP cameras

Installation guidelines IP 4000 series cameras version 1.0

1. INTRODUCTION................................................................................................................. 3

2. INSTALLATION GUIDELINES - FACE RECOGNITION ......................................... 4

2.1. Choosing an installation location ................................................................................... 4

2.2. Camera positioning ......................................................................................................... 5

2.3. Camera options configuration......................................................................................... 7

3. INSTALLATION GUIDELINES - OTHER IMAGE ANALYSIS FUNCTIONS ....... 8

TABLE OF CONTENTS

Installation guidelines IP 4000 series cameras version 1.0

1. INTRODUCTION

Some models of the 4000 series IP cameras are equipped with advanced image analysis functions. To

ensure the proper and effective operation of the functions, it is necessary to meet certain requirements

regarding the place and method of installation of the camera.

Therefore, to ensure high efficiency of the image analysis (VCA) function, Novus recommends that

you follow the instructions in this manual when installing the camera.

INTRODUCTION

This manual is for reference only, and the drawings and diagrams contained therein are only

intended to illustrate the described options.

Due to the high requirements of the face recognition function regarding the scene selection and

camera installation location, it is impossible to give detailed directions. The best effect can be

obtained only by analyzing specific problems and user requirements, and placing the camera

adequately to the specific environment.

Installation guidelines IP 4000 series cameras version 1.0

2. INSTALLATION GUIDELINES - FACE RECOGNITION

2.1. Choosing an installation location

• Select an area where people move in an orderly manner towards the camera as the installation

site. The recognition site must not be obscured by anything. Make sure that the camera can

capture the direction of movement of all the people whose faces you want to recognize.

In the absence of space corresponding to the above conditions, it should be created by setting

walls, barriers, etc. so as to ensure orderly movement of people in front of the camera.

• Ensure stable and sufficiently intense lighting. In the event of insufficient light, or light falling

from behind on the recognized person, additional lighting should be provided so that facial

features are clearly visible.

INSTALLATION - FACE RECOGNITION

Place of installaon suitable: stable and suciently intense light, orderly movement of people

ensured.

Incorrect installaon place: insucient lighng, disordered movement of people, incorrect camera

observaon angle.

Installation guidelines IP 4000 series cameras version 1.0

INSTALLATION - FACE RECOGNITION

2.2. Camera positioning

• The camera should be positioned as directly in front of incoming people as possible. The

camera’s yaw angle should not exceed 30°.

• To minimize masking of the face when observing a group of people, the camera should be

positioned higher than the assumed average level for the faces of passersby. Depending on the

parameters of the camera and the dimensions of the observation site, the mounting height of the

camera should be between 2.5 - 3.5 m. For cameras with short focal length lenses (2.8mm,

3.6mm), the mounting height should not be higher than 3 m. The recommended camera tilt angle

is 15 °.

Installation guidelines IP 4000 series cameras version 1.0

INSTALLATION - FACE RECOGNITION

• The width of the recognition area (W) depends on the resolution of the camera sensor and optical

parameters. A recognition area that is too wide causes blurring and blur in captured face photos

and causes the face recognition to malfunction. Therefore, it is important to choose the

appropriate width of the recognition area, depending on the camera you have. The following table

may be helpful in estimating this parameter:

The distance (L) should be chosen so as to obtain the optimal width of the recognition area.

• The camera mounting height results from the assumptions given earlier and can be estimated

based on the following formula:

H = W + tanα * D

Where:

 D - observation distance

 W - average level on which faces of the observed people are located

 α - camera tilt angle. For a recommended angle of 15 ° tanα = 0.27

Notes:

W is the height of the person's face. The assumed range is 1.3 m≤ W ≤1.7 m. The recommended

W value is 1.5 m. It is recommended that the camera tilt angle α be within the range of 5 ° ≤ α ≤

15 °.

Camera sensor resolution Optimum width of the recognition

area

2MPX 2.5m

4MPX 3.3m

6MPX 4.5m

8MPX 5.5m

Installation guidelines IP 4000 series cameras version 1.0

CONIGURATION - FACE RECOGNITION

2.3. Camera options configuration

• The primary parameter in face recognition is pupil distance. In order for the camera to be able to

correctly distinguish the details of a human face, it should fit in the field of 120x120 pixels. Then

the pupils are about 50 pixels apart, which is optimal for recognition.

For convenient definition of the face size in pixels, you can use the "Pixel counter" option

available as an icon under the live view window.

With the help of another person, place them at the assumed distance from the camera, and then

frame their face. The helper should then move towards and away from the camera until his face

fits within the desired size field. This will be the optimal place for facial recognition. If, for other

reasons, it is not possible to perform recognition in this place, adjust the focal length of the lens

or move the camera to obtain the desired effect.

• After you have positioned the camera, make the appropriate settings in the face recognition menu.

Among the configuration options, there are two ("Min Pixel" and "Max Pixel") related directly to

the face size in the recognition area.

The values of these options are selected such that the calculated or measured face size in the

recognition area is within the range.

Capturing the

scene for

analysis

Face

idencaon in

the eld of

120x120 pixels

Pupillary

posion

recognion

Face images larger and smaller than the set limits will be ignored and will not be analyzed.

Installation guidelines IP 4000 series cameras version 1.0

INSTALLATION - OTHER IMAGE ANALYSIS FUNCTIONS

3. INSTALLATION GUIDELINES - OTHER IMAGE ANALYSIS FUNCTIONS

Other image analysis functions such as "Human and Vehicle Detection", "Crowd Density Detection"

and "Queue Length Detection" also use the facial recognition engine to perform their functions. The

operation of the algorithm is slightly modified here and adapted to other tasks fulfilled by these

functions (especially this applies to the "Crowd Density Detection" and "Queue Length Detection"

functions, which can also recognize people from the back). However, despite these differences, also for

these functions, the principles of mounting and positioning the camera are the same as for the "Face

Recognition" function.

Installation guidelines IP 4000 series cameras version 1.0

NOTES

8.11.2022 TF, MK v.1.0

AAT SYSTEMY BEZPIECZEŃSTWA Sp. z o.o.

431 Pulawska St., 02-801 Warsaw, Poland

tel.: +4822 546 0 546, [email protected]

www.novuscctv.com

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