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The paper discusses an image analysis algorithm implemented in on-line measurement of vehicles video-detectors, where computing processes have to be organised in very short, strictly defined time limit. The data processing simplification is a key problem of image filtering and pre-processing methods finding. The video-recorder interface was constructed using a Programmable Array Logic (PAL) technology, processing binary sequences at the control execution unit. The well-known techniques of images processing were taken under consideration, with their preferences for fulfilling the assumed restrictions. The vehicle successful extraction depends on several conditions that were analysed in details; to be used for video-camera detectors development.