Pan-Tilt & Camera Related Q&A

Why Does the Camera Display Have Horizontal Stripes or Vertical Movement?

Possible reasons might be that the power board is broken. Especially in low light conditions, when AGC is automatically activated and current consumption increases, the issue becomes more visible.

Please check if the transformer output is normal or if the transformer wire has been cut and extended. You may try replacing the transformer or avoid extending the transformer's output power wire.

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Why Is There Diagonal Noise Interference?

It might be due to improper soldering when the wire was not long enough during installation, leading to desynchronization. It could also be caused by interference from the surrounding environment affecting the signal line.

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Why Does the Camera Display Appear Distorted or Show Multiple Images?

Please check the impedance of the cable between the signal and monitor, or verify if the monitor is for multiple viewing points. You may try replacing the cable, or use a distribution amplifier if monitoring multiple points.

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What Are Camera Image Pixels?

Image Pixels: 1. Specified Pixels: 270,000 points (537x505), 410,000 points (811x508). 2. Effective Pixels: 250,000 points (510x494), 380,000 points (768x494). The higher the pixel count, the more delicate the image, but the higher the cost.

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How Are Camera Image Pixels Related to Camera Resolution?

The resolution of the camera is directly proportional to the number of image pixels.

System	Pixel Count	Resolution
Black & White System	250,000 points	330-380 lines
Black & White System	330,000 points	460 lines
Black & White System	410,000 points	600 lines
Color System	250,000 points	330 lines
Color System	330,000 points	400 lines
Color System	410,000 points	480 lines

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Basics of CCTV Theory

CCTV stands for Closed Circuit Television, which means a closed-circuit television system. It uses electrical principles to convert the image light captured by an optical lens into electric power through a chip (CCD) or imaging tube inside the camera, and then transmits it to a monitor through cables and various auxiliary devices, converting electric power back into light energy to be displayed on the screen.

Most modern systems, except for special applications, use CCD cameras. This trend will continue in the future. CCD (charge-coupled device) is an imaging component that converts light into electrical charges, stores and transfers these charges, and extracts them to produce voltage changes.

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Comparison Between CCD and Imaging Tube Cameras

Compared with imaging tube cameras, CCD cameras have the following advantages:

1. Smaller size and lighter weight.
2. Lower residual image.
3. Unaffected by magnetic fields.
4. Shock and vibration resistance.
5. Longer lifespan.

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CCD Size

CCD cameras are available in various sizes such as 2/3 inch, 1/2 inch, and 1/3 inch. Due to smaller image surfaces, the number of pixels and sensitivity are reduced accordingly. Recently, this issue has been resolved, and to save costs, manufacturers mostly use 1/3 inch CCDs.

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Power Supply

1. AC Mains Power
   
2. 24V AC Power Supply
   This type of camera requires an additional 24V AC adapter.
   
3. Single Cable
   The power (DC power) of this type of camera comes from the coaxial cable (with a controller installed), which also carries the video output signal.
   

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Resolution

Resolution typically refers to horizontal resolution unless specified otherwise.

1. Horizontal Resolution: The number is calculated as the maximum number of clear vertical alternating black and white lines multiplied by 0.75. It is generally determined by the pixel count of the CCD and the electronic characteristics of the camera.
2. Vertical Resolution: The number is the maximum count of clear horizontal alternating black and white lines. It is generally determined by the number of scan lines and the scanning method.
   

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Black & White / Color

For monitoring the position of a scene or the movement of a scene, black and white cameras are recommended. Color cameras are suitable for real-time monitoring to identify specific details of a scene. Generally, black and white cameras are more sensitive than color cameras, making them suitable for low-light areas or locations where lighting cannot be installed at night.

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Illumination

Select a camera based on the brightness of the installation site. If the brightness exceeds the minimum subject illumination by more than ten times, the image will be clear.

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