Abstract: An iris image acquisition system for expanding an iris recognition range is proposed. The iris image acquisition system for expanding the iris recognition range enables that a direction, zoom, and focusing of an iris photographing camera for photographing an iris image of a distant subject are controlled quickly and easily without high-level information processing and arithmetic processing.

Abstract: Disclosed herein is a method of detecting a vehicle speed. The method includes receiving a first vehicle image photographed by a camera at a first time; identifying an area occupied by the license plate from the first vehicle image and extracting a first number; receiving a second vehicle image photographed by the camera at a second time; identifying an area occupied by the license plate from the second vehicle image and extracting a second number; comparing the first number with the second number to determine whether the first number is equal to the second number; deciding an actual size of the number of plate; calculating a distance between the vehicle and the camera at first and second times; and calculating a vehicle speed.

Abstract: A surveillance camera has waterproofing members detachably fitted into guide holes for focus control and zoom control. The camera has a lens controller waterproofing member, a focus controller and a zoom controller and includes a housing having a first guide hole and a second guide hole; a first rod fixing part combined with the focus controller outer surface and including a first extended part with a first rod fitting hole; a second rod fixing part combined with the outer surface of the zoom controller and including a second extended part with a second rod fitting hole; first and second waterproofing members sealing the first and second guide holes; a focus control rod fastened through the first waterproofing member; and a zoom control rod fastened through the second waterproofing member.

Abstract: Disclosed herein is a method of preventing collisions between readers in an RFID system. The method includes a first step of RFID readers selecting transmitting channels by examining channels, a second step of transmitting signals via the selected transmitting channels, a third step of receiving signals via channels having the same frequencies as the selected transmitting channels; a fourth step of determining whether a collision has occurred by examining the status of the signals that are received via the transmitting channels; a fifth step of, if, as a result of the determination at the fourth step, it is determined that a collision between the readers has occurred, repeating the first to fourth steps after delays of random time periods based on a predetermined equation, and a sixth step of, if, as a result of the fourth step, no collision between readers is detected, communicating with the corresponding RFID tags.

Abstract: The present invention relates to an apparatus and method for operating a day and night mode of a monitoring camera by measuring a brightness in a no video signal interval which are implemented in a such a manner that when a control unit detects a non video signal interval from a video signal from a camera which photographs a photographing object zone, a state of the current lighting unit is set to an off state, and a measuring signal for operating a detection unit is outputted, and a brightness of the current photographing object is measured based on the detection signal from the detection unit, and it is judged whether the brightness of the current photographing object is above a critical value that it is not needed to operate the lighting, and when the brightness of the same is above a critical value, the mode is set to a day mode, and a control signal is generated for maintaining the current off state of the lighting unit and is outputted to the lighting unit, and when the brightness of the same is below a