Use a unified video standard source test
After Qin Shihuang unified the world, uniting the six languages ​​and weights and measures greatly promoted the development of production. Today, hard disk recorders have also entered the Spring and Autumn Period and the Warring States Period. The various compression methods that appear constantly are dazzling, and the quality of the images is even more persuasive. The biggest problem is that there is no unified video test signal source. We did not compete on the same starting line. The DVR recorded the video signal output from the camera, and finally the output video signal was displayed on the monitor. The video standard test signal source should be the same signal source of the hard disk recorders with different compression methods. In this way, the problem is simple.
Computer Monitor Computer-based video analysis software VGA monitor to compare static standard video signals to be tested DVR hard disk recorders (multiple) video signal to be measured visual comparison video composite analyzer monitor A monitor B standard video signal audio signal motion image computer computer Display Subjective Evaluation Image Test Signal DVD Disc Video Signal Generator Standard Test Chart Camera Shoot Computer Monitor Similar Standard Video Signal Active Standard Video Signal To Compare
Activity Image Compression Efficiency Evaluation
Since hard disk recorders record a wide variety of moving images, it is much more difficult to measure compressed video moving images because of the image quality of the compressed video system, the data rate, the complexity of the image, and the coding algorithm used. With dynamic changes, the static test signal cannot fully reflect the true nature of the image quality, and an actual scene that is far more complicated than the static test signal should be used to highlight this feature of the compressed video system. After the active video signal is converted digitally and recorded and transmitted through various compression methods, it is prone to distortion and damage. It is very important to select which active video signal is first selected, but the selected moving image cannot use the images with storylines to avoid distracting observations. The attention of the person. The picture should have different levels of detail richness with different brightness, contrast and more saturation levels.
The selected moving image should have the following characteristics: the size of the different proportions of the main body of the movement in the background image; the direction of movement of the main body of the movement; whether it is a straight motion or a curved motion; or an irregular motion; the subject must have red, green, blue, yellow, The eight basic colors of product, blue, white, and black; the moving speed of the moving subject; in the background moving state, the camera follows the moving object and moves; the fixed camera photographs the moving object and moves, the lens moves left and right and zooms; A variety of color rotations; the background is complex or simple, the subject is more adjustment, medium adjustment or less detail.
The above 8 types are also our typical classifications for all video activity images, covering the basic features of moving images. According to these characteristics of video motion images, video coding based on the video object plane consists of two main parts, the traditional texture, motion information coding (motion compensation and motion compensation) and MPEC-4 specific shape coding.
Various compression methods and compression ratios have different sizes of code streams after these 8 types of moving images are processed. After compression, distortions and damages are also different, and the performance of the encoder/decoder is evaluated accordingly.
Method of assessing moving images
The best way to test a compressed video is how satisfied the observer is with the image processed by the DVR, either by professionals or non-professionals as viewers. Due to the different subjective feelings of observers, the following assessment methods can be selected as needed.
Contrast method
Play live images, all the way to the hard disk recorders, all the way to other brands of hard disk recorders, all the way to the direct monitor to compare scores, carefully observe the damage of the moving image.
Instrument method
In addition to direct observation on the monitor, a video synthesis analyzer is additionally connected to observe and analyze the displayed waveform. And automatically test the video technical indicators; use high-quality signal conversion card, use video analysis software to test on the computer.
The above two methods can observe some annoying image damage related to MPEG compression, such as mosaic effect, jaggies, skeining, and irrelevant Gaussian noise, which are helpful for checking frozen frames and dropped frames.
Automatic Test Method; Image Quality Analyzer
It directly replaces the subjective human-eye video evaluation and provides reliable, fast, accurate, and consistent image quality measurement. The DVR image is input to the instrument.
The image quality measurement results are represented by a single numerical value. The instrument performs three-dimensional evaluation of complex motion test image sequences, namely spatial analysis, timing analysis, and full-color analysis.
The image quality analyzer will automatically submit the following test results:
Image quality rate score;
Observe the score distribution of each frame.
The graphical form shows the difference between the original video image and the test video image and highlights the difference.
After Qin Shihuang unified the world, uniting the six languages ​​and weights and measures greatly promoted the development of production. Today, hard disk recorders have also entered the Spring and Autumn Period and the Warring States Period. The various compression methods that appear constantly are dazzling, and the quality of the images is even more persuasive. The biggest problem is that there is no unified video test signal source. We did not compete on the same starting line. The DVR recorded the video signal output from the camera, and finally the output video signal was displayed on the monitor. The video standard test signal source should be the same signal source of the hard disk recorders with different compression methods. In this way, the problem is simple.
Computer Monitor Computer-based video analysis software VGA monitor to compare static standard video signals to be tested DVR hard disk recorders (multiple) video signal to be measured visual comparison video composite analyzer monitor A monitor B standard video signal audio signal motion image computer computer Display Subjective Evaluation Image Test Signal DVD Disc Video Signal Generator Standard Test Chart Camera Shoot Computer Monitor Similar Standard Video Signal Active Standard Video Signal To Compare
Activity Image Compression Efficiency Evaluation
Since hard disk recorders record a wide variety of moving images, it is much more difficult to measure compressed video moving images because of the image quality of the compressed video system, the data rate, the complexity of the image, and the coding algorithm used. With dynamic changes, the static test signal cannot fully reflect the true nature of the image quality, and an actual scene that is far more complicated than the static test signal should be used to highlight this feature of the compressed video system. After the active video signal is converted digitally and recorded and transmitted through various compression methods, it is prone to distortion and damage. It is very important to select which active video signal is first selected, but the selected moving image cannot use the images with storylines to avoid distracting observations. The attention of the person. The picture should have different levels of detail richness with different brightness, contrast and more saturation levels.
The selected moving image should have the following characteristics: the size of the different proportions of the main body of the movement in the background image; the direction of movement of the main body of the movement; whether it is a straight motion or a curved motion; or an irregular motion; the subject must have red, green, blue, yellow, The eight basic colors of product, blue, white, and black; the moving speed of the moving subject; in the background moving state, the camera follows the moving object and moves; the fixed camera photographs the moving object and moves, the lens moves left and right and zooms; A variety of color rotations; the background is complex or simple, the subject is more adjustment, medium adjustment or less detail.
The above 8 types are also our typical classifications for all video activity images, covering the basic features of moving images. According to these characteristics of video motion images, video coding based on the video object plane consists of two main parts, the traditional texture, motion information coding (motion compensation and motion compensation) and MPEC-4 specific shape coding.
Various compression methods and compression ratios have different sizes of code streams after these 8 types of moving images are processed. After compression, distortions and damages are also different, and the performance of the encoder/decoder is evaluated accordingly.
Method of assessing moving images
The best way to test a compressed video is how satisfied the observer is with the image processed by the DVR, either by professionals or non-professionals as viewers. Due to the different subjective feelings of observers, the following assessment methods can be selected as needed.
Contrast method
Play live images, all the way to the hard disk recorders, all the way to other brands of hard disk recorders, all the way to the direct monitor to compare scores, carefully observe the damage of the moving image.
Instrument method
In addition to direct observation on the monitor, a video synthesis analyzer is additionally connected to observe and analyze the displayed waveform. And automatically test the video technical indicators; use high-quality signal conversion card, use video analysis software to test on the computer.
The above two methods can observe some annoying image damage related to MPEG compression, such as mosaic effect, jaggies, skeining, and irrelevant Gaussian noise, which are helpful for checking frozen frames and dropped frames.
Automatic Test Method; Image Quality Analyzer
It directly replaces the subjective human-eye video evaluation and provides reliable, fast, accurate, and consistent image quality measurement. The DVR image is input to the instrument.
The image quality measurement results are represented by a single numerical value. The instrument performs three-dimensional evaluation of complex motion test image sequences, namely spatial analysis, timing analysis, and full-color analysis.
The image quality analyzer will automatically submit the following test results:
Image quality rate score;
Observe the score distribution of each frame.
The graphical form shows the difference between the original video image and the test video image and highlights the difference.
- OUTFIT YOUR ORGANIZATION: This bulk 100-piece retractable badge holder reel pack provides enough ID holders for your entire organization and is conveniently priced for affordability.
- LONG-LASTING BUILD: Contains a 26.5" retractable nylon cord with a stainless steel spring housed in an ABS plastic housing which offers durability for everyday wear.
- COMPACT DESIGN: Helps keep ID cards and name tags in place while sitting unobtrusively on your belt.
- EASY TO USE: A vinyl snap strap makes it easy to attach ID holders, name tags, and badges while offering immediate accessibility; ideal for maintenance, safety and security personnel.
- MEASUREMENTS: Extended cord length measures 26.5 inches, plastic housing measures 1.18 inches in diameter.
Metal ID Card Badge Reel,YoYo ID Card Badge Holder,Lanyards Id Badge Holder
Wintape Measuring Tape Company , https://www.wintapetapemeasure.com