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Video surveillance system image quality detection method


Measurement method is to use a certain slope of the ramp signal, as shown in Figure 8, the input end of the device under test input, the output device with a video monitoring system detects a signal to noise ratio can be measured. The principle of this measurement method is based on this ramp after the quantization noise of digital linear distribution is uniform, the quantization noise power consistent with equation (1) a test signal. Figure 8 ramp signal test proved that, with the ramp signal to noise ratio than the flat field test signal is generally low 6dB or so,[link widoczny dla zalogowanych], to reflect more realistic DVR processed by the video signal to noise ratio. 5 Conclusion We have used this method more than 1O Chongqing video surveillance systems to detect, identify with the subjective assessment of the past can not be found unreasonable as equipment selection,[link widoczny dla zalogowanych], construction, installation and other causes of non-standard minimum illumination, video image clarity, the channel signal to noise ratio, which do not meet the technical indicators of quality problems, the problem timely rectification works, ensuring the quality of the video monitoring system. Proved in this paper a more comprehensive classification method can detect the video monitoring system performance, the method is simple and feasible. References 『1] GB50348 - 2004 security engineering. Ministry of Construction, State Administration of Quality Supervision jointly issued. [2] DB50/216--2006 public safety information system technology for video images. Quality and Technology Supervision released. [3] GA/T669--2006 network system monitoring and alarming the city general technical requirements. Ministry of Public Security released. [4] GB20815 - 2006 video monitoring digital video equipment. AQSIQ released. 『5] GB50395 - 2007 video security monitoring system engineering. Ministry of Construction, issued jointly by the State Administration of Quality Supervision, China Planning Press 『6] SJ/T10203--1991CCD veneer application of color television camera measurement. State Technical Supervision issued [7] Tong Yu Bing,[link widoczny dla zalogowanych], Hu Weiwei, et al. Video Quality Evaluation Methods. Computer Aided Design and Computer Graphics,[link widoczny dla zalogowanych], 2006 (5) the impact of the change in pulse rate measured Zhang Hongyu (Beijing Institute of detection measures, Beijing 100029,[link widoczny dla zalogowanych], China) Abstract peak acceleration and pulse width of the impulse is to describe the two important parameters, however, In practice, the shock wave to produce the standard there will be many difficulties, which makes the impact of the change in pulse rate measurement becomes particularly important. Impact acceleration generated by the process of analysis, we will see, according to the traditional concept of the change in the speed calculated in accordance with the acceleration of the integration process and does not reflect the true impact, the impact of the change in pulse rate should be the absolute acceleration points. Key words shock pulse; speed variation; absolute; integral operation DoI: 10.3969 / j. issn. Introduction The impact of the phenomenon exists 1000-0771.2010.01.0130 and engineering aspects of life, such as the collision of two objects, hanging objects fall, the impact of waves on ships and so on. To test the ability to impact subjects, laboratory often used shock, impact test to simulate the specimen during transport or installation may be subjected to the impact of non-repetitive or multiple repetitive collision. To fully reproduce the actual impact of the process is unrealistic, therefore, the provisions of relevant international or national standards, several conventional shock pulse waveform as a standard laboratory impact test waveforms, the provisions of this unity is also beneficial impact of samples Q performance comparison. These include the half-sine wave, after the peak sawtooth, trapezoidal, etc., of which half-sine is the most common one. While the impact experiment in the accurate measurement of pulse, is related to international or national standards under the impact test to ensure the correct implementation. Volume Q: There are three described the impact of pulse parameters, peak acceleration, pulse width, and speed variation. The International Electrotechnical Commission standards IEC68-2-27 and the corresponding national standard GB2423.5-8l \also the corresponding regulations. In the past, because the means test limits, we generally only care about the impact of acceleration and pulse width of the two parameters, or even that the shock acceleration and the pulse width is determined, the speed variation between the two points as it no longer need a separate measurement. This theory qualitatively explains the actual speed waveform measurement of the importance of the change in focus that variations in the process of solving the speed problems should be noted, that the change in speed should be the integral of the absolute value of impact acceleration, and not simply by the integral of acceleration is calculated.

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