The explanation of many professional terms plays a decisive role in monitoring the installation. It can be seen that it is very important to understand the terminology of digital monitoring. The following will explain the common terms and explanations used in digital surveillance.
1, DSUB15HDDSUB15HD is a standard connector.
Fps frames per second. Measure the amount of information used to save and display dynamic video. This term is also used in movie video and digital video. Each frame is a still image; displaying frames in rapid succession creates an illusion of motion. The more frames per second (fps), the smoother the displayed action will be. Generally, the minimum fps to avoid motion is 30. Some computer video formats, such as AVI, can only provide 15 frames per second.
2. MMX Intel® MMX® technology is designed to accelerate the speed of multimedia and communications applications. The technology adds new instructions and data types to enable applications to achieve higher levels of performance. It takes full advantage of the parallel computing capabilities inherent in many multimedia and communication algorithms, and is fully compatible with existing operating systems and applications.
MPEG image MPEG image encoding contains 3 components: I-frames, P-frames, and B-frames. In the MPEG encoding process, some pictures are compressed into I-frames, some are compressed into P-frames, and others are compressed into B-frames. I-frame compression results in a 6:1 compression ratio without any noticeable blurring. Compression of I-frames using P-frame compression can achieve higher compression ratios without noticeable blurring. B-frame compression can achieve a compression ratio of 200:1. Its file size is generally 15% of the compressed size of an I-frame and less than half of the compressed size of a P-frame. I-frame compression removes the spatial redundancy of the image, P-frames and B-frames remove the temporal redundancy.
3, NTSCNTSC a video standard. National Television Systems Committee (National Television Systems Committee). A committee of the Electronic Industry Association has set standards for commercial television broadcasting in the United States, Canada, Japan, and parts of Central and South America. The NTSC format is 30 frames per second (30 Hz) and the resolution is 525 scan lines (rows). PAL PhaseAlterationLine: This standard is used for commercial broadcasting in most European countries, Australia, Central America and South America. In the PAL format display, 25 frames per second (25 Hz) and a resolution of 625 scan lines (rows).
4. PALPAL is a video standard.
The PAL system is a color TV broadcasting standard developed by West Germany in 1962. It overcomes the shortcomings of the NTSC system's color distortion due to phase sensitivity. It is adopted by West Germany, the United Kingdom, Singapore, China, Hong Kong, Australia, and New Zealand. This system.
QCIFQCIF is a commonly used standardized image format. In the H.323 protocol suite, the standard acquisition resolution of a video capture device is specified. QCIF=176×144 pixels.
SofteningSoftening, a must-see process for image appearance, can be implemented with softening filters during image acquisition. The blockiness of the edge of the object in the image can be removed, thereby increasing the quality of the image at a low rate of compression and compression of the compressed image. SourcevideoSourcevideo (original image), the original image accessed by a digital image editing and compression application. Non-digital lake images are first collected in digital format. The source image can be a videotape, a laser disk, or a dynamic script, or it can be an existing digital image file.
5, SourcevideodeviceSourcevideodevice (source image device) for playing non-digital images of the device. Source video devices include VCRs, compact disc players, and video camcorders for VCD players.
6. SQCIFSQCIF is a commonly used standardized image format. SQCIF = 128 x 96 pixels.
The S video input has an S video input interface (SVideo). Since the S video signal does not need to be encoded or decoded, there is no signal loss, so the S video signal is of better quality than the standard video signal.
7, VisualcomponentVisualcomponent (screen component) an image of the screen part (you can see part). It is kept separately from the sound components so that the two components can be used separately. When talking about audio and picture components, picture components are often called image components.
8. The standard video input has a standard video input interface (RCA). The standard video signal is encoded at the time of output, the signal is compressed and output, and it is decoded when received. This will lose some signal.
9. The main formats of television systems in the world are PAL and NTSC.
TSC: National Television Systems Committee (National Television Systems Committee). It is a television standard in some countries in North America, Japan, and South America. NTSC has a resolution of 525 lines and a refresh rate of 60 Hz. NTSC refers to a video or television signal. PAL: PhaseAlternateLine. It is a television standard in some countries in Western Europe, Asia, Australia, Africa and South America. PAL has 625 lines of resolution and 50Hz refresh rate. PAL refers to a video or television signal.
Interlacing draws frames by interlacing each field line. For example, NTSC broadcasts are represented at 30 frames per second, but are actually composed of 60 half-frames that are displayed sequentially. Another way is to scan progressively, drawing only the entire frame on the screen.
The interlaced video content indicates that the two types of video data fields (ie, odd or even) in the video content of a particular screen are separately scanned (eg, TV signals such as NTSC and PAL). Problems occur when interlaced content encounters non-interlaced media that can only display non-interlaced content (such as computer monitors).
Video: Visual or image information. Convert a moving or stationary image into an electrical signal. In computer video, the red, green, blue, and sync signals are separate electrical signals. In VHS video, the red, green, blue, and sync signals are a single electrical signal. In S-VHS video, the red, green, blue, and sync signals are separated.
The video capture card video capture card occupies an expansion slot in the computer through which the video signal is captured by the playback device. In general, video capture cards come with a docking station that provides various jacks for connecting playback devices. Digital video signals occupy very large hard disk space, so many capture cards compress the signals while capturing video signals to avoid possible bottlenecks in the CPU, data bridge (connecting capture cards and computers), and writing to hard disks. . The so-called bottleneck means that when any one of the above links is too late to process the input signal, the most direct result is the loss of some video content (frames). When the video stream is captured on a computer, it will be stored as a video file. You can specify a frame rate, such as 15 frames, with your video capture software. The video capture software will use the capture card to save the input video signal to the buffer at a rate of 15 frames per second, and then write the video file. Into the hard disk. The most likely bottleneck is hard disk. Therefore, it is very important to install a hard disk with a continuous throughput as high as possible, and you need to know that the data that the hard disk has to process continuously is even bigger than you think. Those who produce broadcast-quality film and television works generally use disk arrays -- getting the maximum throughput through the cooperation of several hard disks.
Video overlay video overlay is the ability to overlay computer graphics on real-time or video signals and store the overlayed video images on a hard disk.
Video signals can support three formats for video signals: NTSC, PAL, SECAM
Signal-to-noise ratio The ratio of the signal's maximum fidelity output to the unavoidable electronic noise in dB. The bigger the value, the better. Below the 75 dB indicator, noise may be found in silence. The signal to noise ratio of the AWE64Gold sound card is 80dB, which is reasonable. SBLIVE is the top signal-to-noise ratio that claims to exceed 120dB. In general, the signal-to-noise ratio of a sound card is often unsatisfactory due to the high frequency interference in the computer. The signal-to-noise ratio of the camera's captured image is the same as the sharpness of the image. It is an important indicator of the quality of the image. Image SNR refers to the ratio of the size of a video signal to the size of a noise signal. These two signals are generated at the same time and cannot be separated. A noise signal is a useless signal. Its presence has an effect on useful signals. However, it cannot be separated from the video signal. Therefore, when selecting a camera, some useful signals should be chosen to be relatively larger than the noise signal to a certain extent, so the ratio of the two is used as a measure of the standard. If the signal-to-noise ratio of the image is large, the picture of the image will be clean and there will not be any noise interference (snowflake shape in the main picture). People will look very comfortable; if the signal to noise ratio of the image is small, then the picture The meeting will be full of snowflakes, which will affect the normal viewing effect. Frame A video image in a series of video images. The film is composed of a series of continuous pictures. Each picture is a frame, PAL is 25 frames per second, and NTSC is 30 frames per second. Frame rate Video clips Displays the number of frames per second.
Frame rate The number of frames per second that is used to measure the speed of video signal transmission in frames per second (fps)
Frame rate For video content, frame rate refers to the number of still frames displayed per second. When capturing dynamic video content, the higher this number, the better.
MPEG File format compressed with MPEG-1 compression standard. It can be divided into the picture and sound surface including the image file, and can include only the picture component.
AVIAAVI is the abbreviation of AudioVideoInterleave. The video format of Windows 3.1 is compatible, convenient to call, and has good image quality and large size.
CSS "Content Encryption Encoding System". Official DVD video digital encryption scheme. Only CSS licensed DVD players can decipher the password for video data.
CVBSCVBS is a composite video.
DivX Digital Video Codec (Codec) using MPEG-4 technology. The file format is to compress high-quality video into videos that are small enough to spread on the Internet to meet the actual needs of a wide range of users.
1, DSUB15HDDSUB15HD is a standard connector.
Fps frames per second. Measure the amount of information used to save and display dynamic video. This term is also used in movie video and digital video. Each frame is a still image; displaying frames in rapid succession creates an illusion of motion. The more frames per second (fps), the smoother the displayed action will be. Generally, the minimum fps to avoid motion is 30. Some computer video formats, such as AVI, can only provide 15 frames per second.
2. MMX Intel® MMX® technology is designed to accelerate the speed of multimedia and communications applications. The technology adds new instructions and data types to enable applications to achieve higher levels of performance. It takes full advantage of the parallel computing capabilities inherent in many multimedia and communication algorithms, and is fully compatible with existing operating systems and applications.
MPEG image MPEG image encoding contains 3 components: I-frames, P-frames, and B-frames. In the MPEG encoding process, some pictures are compressed into I-frames, some are compressed into P-frames, and others are compressed into B-frames. I-frame compression results in a 6:1 compression ratio without any noticeable blurring. Compression of I-frames using P-frame compression can achieve higher compression ratios without noticeable blurring. B-frame compression can achieve a compression ratio of 200:1. Its file size is generally 15% of the compressed size of an I-frame and less than half of the compressed size of a P-frame. I-frame compression removes the spatial redundancy of the image, P-frames and B-frames remove the temporal redundancy.
3, NTSCNTSC a video standard. National Television Systems Committee (National Television Systems Committee). A committee of the Electronic Industry Association has set standards for commercial television broadcasting in the United States, Canada, Japan, and parts of Central and South America. The NTSC format is 30 frames per second (30 Hz) and the resolution is 525 scan lines (rows). PAL PhaseAlterationLine: This standard is used for commercial broadcasting in most European countries, Australia, Central America and South America. In the PAL format display, 25 frames per second (25 Hz) and a resolution of 625 scan lines (rows).
4. PALPAL is a video standard.
The PAL system is a color TV broadcasting standard developed by West Germany in 1962. It overcomes the shortcomings of the NTSC system's color distortion due to phase sensitivity. It is adopted by West Germany, the United Kingdom, Singapore, China, Hong Kong, Australia, and New Zealand. This system.
QCIFQCIF is a commonly used standardized image format. In the H.323 protocol suite, the standard acquisition resolution of a video capture device is specified. QCIF=176×144 pixels.
SofteningSoftening, a must-see process for image appearance, can be implemented with softening filters during image acquisition. The blockiness of the edge of the object in the image can be removed, thereby increasing the quality of the image at a low rate of compression and compression of the compressed image. SourcevideoSourcevideo (original image), the original image accessed by a digital image editing and compression application. Non-digital lake images are first collected in digital format. The source image can be a videotape, a laser disk, or a dynamic script, or it can be an existing digital image file.
5, SourcevideodeviceSourcevideodevice (source image device) for playing non-digital images of the device. Source video devices include VCRs, compact disc players, and video camcorders for VCD players.
6. SQCIFSQCIF is a commonly used standardized image format. SQCIF = 128 x 96 pixels.
The S video input has an S video input interface (SVideo). Since the S video signal does not need to be encoded or decoded, there is no signal loss, so the S video signal is of better quality than the standard video signal.
7, VisualcomponentVisualcomponent (screen component) an image of the screen part (you can see part). It is kept separately from the sound components so that the two components can be used separately. When talking about audio and picture components, picture components are often called image components.
8. The standard video input has a standard video input interface (RCA). The standard video signal is encoded at the time of output, the signal is compressed and output, and it is decoded when received. This will lose some signal.
9. The main formats of television systems in the world are PAL and NTSC.
TSC: National Television Systems Committee (National Television Systems Committee). It is a television standard in some countries in North America, Japan, and South America. NTSC has a resolution of 525 lines and a refresh rate of 60 Hz. NTSC refers to a video or television signal. PAL: PhaseAlternateLine. It is a television standard in some countries in Western Europe, Asia, Australia, Africa and South America. PAL has 625 lines of resolution and 50Hz refresh rate. PAL refers to a video or television signal.
Interlacing draws frames by interlacing each field line. For example, NTSC broadcasts are represented at 30 frames per second, but are actually composed of 60 half-frames that are displayed sequentially. Another way is to scan progressively, drawing only the entire frame on the screen.
The interlaced video content indicates that the two types of video data fields (ie, odd or even) in the video content of a particular screen are separately scanned (eg, TV signals such as NTSC and PAL). Problems occur when interlaced content encounters non-interlaced media that can only display non-interlaced content (such as computer monitors).
Video: Visual or image information. Convert a moving or stationary image into an electrical signal. In computer video, the red, green, blue, and sync signals are separate electrical signals. In VHS video, the red, green, blue, and sync signals are a single electrical signal. In S-VHS video, the red, green, blue, and sync signals are separated.
The video capture card video capture card occupies an expansion slot in the computer through which the video signal is captured by the playback device. In general, video capture cards come with a docking station that provides various jacks for connecting playback devices. Digital video signals occupy very large hard disk space, so many capture cards compress the signals while capturing video signals to avoid possible bottlenecks in the CPU, data bridge (connecting capture cards and computers), and writing to hard disks. . The so-called bottleneck means that when any one of the above links is too late to process the input signal, the most direct result is the loss of some video content (frames). When the video stream is captured on a computer, it will be stored as a video file. You can specify a frame rate, such as 15 frames, with your video capture software. The video capture software will use the capture card to save the input video signal to the buffer at a rate of 15 frames per second, and then write the video file. Into the hard disk. The most likely bottleneck is hard disk. Therefore, it is very important to install a hard disk with a continuous throughput as high as possible, and you need to know that the data that the hard disk has to process continuously is even bigger than you think. Those who produce broadcast-quality film and television works generally use disk arrays -- getting the maximum throughput through the cooperation of several hard disks.
Video overlay video overlay is the ability to overlay computer graphics on real-time or video signals and store the overlayed video images on a hard disk.
Video signals can support three formats for video signals: NTSC, PAL, SECAM
Signal-to-noise ratio The ratio of the signal's maximum fidelity output to the unavoidable electronic noise in dB. The bigger the value, the better. Below the 75 dB indicator, noise may be found in silence. The signal to noise ratio of the AWE64Gold sound card is 80dB, which is reasonable. SBLIVE is the top signal-to-noise ratio that claims to exceed 120dB. In general, the signal-to-noise ratio of a sound card is often unsatisfactory due to the high frequency interference in the computer. The signal-to-noise ratio of the camera's captured image is the same as the sharpness of the image. It is an important indicator of the quality of the image. Image SNR refers to the ratio of the size of a video signal to the size of a noise signal. These two signals are generated at the same time and cannot be separated. A noise signal is a useless signal. Its presence has an effect on useful signals. However, it cannot be separated from the video signal. Therefore, when selecting a camera, some useful signals should be chosen to be relatively larger than the noise signal to a certain extent, so the ratio of the two is used as a measure of the standard. If the signal-to-noise ratio of the image is large, the picture of the image will be clean and there will not be any noise interference (snowflake shape in the main picture). People will look very comfortable; if the signal to noise ratio of the image is small, then the picture The meeting will be full of snowflakes, which will affect the normal viewing effect. Frame A video image in a series of video images. The film is composed of a series of continuous pictures. Each picture is a frame, PAL is 25 frames per second, and NTSC is 30 frames per second. Frame rate Video clips Displays the number of frames per second.
Frame rate The number of frames per second that is used to measure the speed of video signal transmission in frames per second (fps)
Frame rate For video content, frame rate refers to the number of still frames displayed per second. When capturing dynamic video content, the higher this number, the better.
MPEG File format compressed with MPEG-1 compression standard. It can be divided into the picture and sound surface including the image file, and can include only the picture component.
AVIAAVI is the abbreviation of AudioVideoInterleave. The video format of Windows 3.1 is compatible, convenient to call, and has good image quality and large size.
CSS "Content Encryption Encoding System". Official DVD video digital encryption scheme. Only CSS licensed DVD players can decipher the password for video data.
CVBSCVBS is a composite video.
DivX Digital Video Codec (Codec) using MPEG-4 technology. The file format is to compress high-quality video into videos that are small enough to spread on the Internet to meet the actual needs of a wide range of users.
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