ТЕХНИЧЕСКАЯ ЗАЩИТА ВИЗУАЛЬНОЙ ИНФОРМАЦИИ В ОФИСНЫХ ПОМЕЩЕНИЯХ МЕТОДОМ ИНФРАКРАСНОЙ ЗАСВЕТКИ

Abstract

The paper presents the results of qualitative theoretical analysis and experimental researches of the influence of infrared radiation (illumination) on a webcam operation. The video cameras used in hidden surveillance are made on the basis of silicon CCD-matrix. The sensitivity of silicon CCDmatrix to optical radiation exceeds the sensitivity of the human eye by several times, and it is shifted along the spectrum to the infrared region not visible to the eye. Controlling the exposure and aperture of the video camera allows changing the sensitivity of the camera within a wide range, adjusting to changes in external illumination. Infrared radiation invisible to the eye has a significant effect on the formation of the recorded video image, and it cannot be completely cut off without a significant deterioration in the characteristics of video shooting. The formation of the uniform and isotropic illumination in the infrared region in the room can neutralize any covert surveillance based on video cameras. Researches have shown the possibility of destructive effects of the infrared radiation on video shooting without destroying electronics in the camera, which does not affect the comfort of employees in a protected room. The authors propose methods of protecting office premises from hidden video surveillance and a methodology for studying the effects of infrared radiation on a webcam in the course of the physical basics of information protection.