Apollo RoadRunner Installatiehandleiding - Pagina 16
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Computer Terms
Bandwidth
The available capacity of a system or connection. Usually much less than the published rating.
Encryption
Processing and altering data so only the intended recipient can read or use it. The recipient of the encrypted data must have the proper decryption key and
program to decipher the data back to its original form.
IP Address
Internet Protocol. A series of numbers that sets the address of a device on a network.
Network
Digital connection between two or more devices.
HDD
Hard Disk Drive. Can be in a computer or DVR
RS-232/RS-422 Computer communication standards used in video for the control of certain video equipment. Computer controlled VCRs, edit controllers, switchers and other
studio equipment can commonly be found in professional video studios. Successfully linking two devices, at the very least requires that they use the same
communication protocol.
Serial Port
A computer l/O (input/output) port through which the computer communicates with the external world. The standard serial port uses RS-232 or RS-422* protocols
Watermarking
A pattern of bits inserted into a digital image, audio or video file that identifies the file's copyright information (author, rights, etc.) Unlike printed watermarks,
which are intended to be somewhat visible, digital watermarks are designed to be completely invisible, or in the case of audio clips, inaudible. Moreover, the
actual bits representing the watermark must be scattered throughout the file in such a way that they cannot be identified and manipulated.
Video Terms
Artifacts
Visible distortion or blurriness due to compression in images
Compression
The process of electronically processing a video picture to make it use less storage or to allow more video to be sent down a transmission channel.
Examples:
ips
images per second. The rate cameras are sampled at for recording.
Resolution
1. The number of pixels (individual points of color) contained on a display monitor, expressed in terms of the number of pixels on the horizontal axis and the
number on the vertical axis. Examples: 720 x 288 or 352 x 240
2. Rating of the fine detail of a TV picture, measured in scan lines. The more lines, the higher the resolution and the better the picture. A standard VHS format VCR
produces 240 lines of horizontal resolution.
3. The process of removing picture data to decrease the size of a video image.
Camera Terms
AGC
Auto Gain Control. Circuitry in cameras that improves performance in low light conditions.
AWB
Auto White Balance. Circuitry in color cameras that compensates for different lighting conditions
BLC
Back Light Compensation. Ability of a camera to adjust for brightly lit backgrounds.
Digital Zoom
A method of zooming either by increasing the size of the pixels in the image or by interpolating between them.
Field Of View
Area covered by a camera
Optical Zoom
The use of lenses to change the focal length of a digital or analog camera. Image quality is superior to digital zoom.
White Balance
An electronic process used in camcorders* and video cameras* to calibrate the picture for accurate color display in different lighting conditions. (i.e., sunlight vs.
indoor incandescent) White balancing should be performed prior to any recording, typically by pointing the camera at a white object for reference.
DVR Terms
BNC connector
A type of connector used on some VCRs, video and RF equipment providing twist-lock capability.
DVR
Digital Video Recorder
Event
Any input that creates an entry in a log and/or triggers recording to begin.
Input
Any signal received by a device. Audio, video, voltage and contact closure to ground are some examples of outputs.
Mil-spec
Rated for vibration according to established Military specifications
Monitor
Displays the video image, may also have speakers. Usually used when there is no laptop with the system
Output
Any signal created by a device. Audio, video, voltage and contact closure to ground are some examples of outputs.
JPEG Still images, usually used for photos. Good quality but large files, short recording times.
MPEG Standardized motion-based compression, similar to that used on DVD's and Cable TV broadcasts. Apollo's chosen method of
compression, giving high quality video and longest recording times.
M-JPEG Non-standard method; series of still images with very large file sizes, very poor recording times.
RoadRunner Installation Guide
Glossary
Page 15