Target observation performance evaluation method for video surveillance based on Johnson criteria

A key technology research suitable for unattended optoelectronic reconnaissance system

“…The unattended photoelectric reconnaissance system is mainly composed of sensor components, servo stabilization system, and intelligent processing display and control terminal, as shown in Figure 1.Sensor components include highdefinition TVs and thermal imager to achieve real-time monitoring and transmission of all-weather images.The servo stabilization system includes azimuth mechanism and elevation mechanism to realize the functions of three-dimensional scanning and inertial state follow-up of the target area.The intelligent processing display control terminal makes automatic control decisions by fusing video data, sensor data, servo angle and other information, controls the servo system to realize target area reconnaissance, completes target detection through sensor components, and finally realizes target threat voice warning.According to Johnson's criterion, combined with comprehensive factors such as target characteristics, operating distance, and pixels required for target detection in unattended reconnaissance missions [4] , the performance parameters of the sensor components of the photoelectric reconnaissance system are shown in Table 1.    …”

“…According to Johnson criterion, target recognition under 50% probability requires that the number of line pairs is at least 8, that is, the number of pixels occupied is 8 8;Target recognition at 95% probability requires that the number of pairs of lines is at least 16, that is, the number of pixels occupied is 16 16 [4] 。According to the reconnaissance warning mechanism proposed in this paper, in order to improve the target detection probability, the minimum target detection and recognition pixel is set as 32 32。When searching on the ground, the specific target can detect the appropriate vertical…”