Abstract: A road shape recognition device checks a position of a currently travelling vehicle detected by a position detection device with map information so that a road shape at each travelling spot of the currently travelling vehicle is recognized. An image division device divides a display screen of surrounding image data of the currently travelling vehicle into a plurality of divided regions depending on the road shape and sets a data compression rate suitable for the road shape in each of the plurality of divided regions. An image compression device compresses the surrounding image data in each of the plurality of divided regions into codes based on the data compression rate set for each of the divided regions.

Abstract: In a phase adjustment device according to the present invention, a first luminance level detector detects a luminance level of a digital imaging signal in a first pixel region, a second luminance level detector detects a luminance level of the digital imaging signal in a second pixel region, a data comparator compares detection results by the first and second luminance level detectors, an adjustment judger judges if it is necessary to adjust a phase of a pulse based on a result of the comparison by the data comparator, a timing adjuster shifts the phase of the pulse in the second pixel region when the luminance levels are detected, and further, the timing adjuster adjusts the phase of the pulse when the judgment by the adjustment judger indicates that the phase adjustment is necessary.

Abstract: An image pickup device that picks up an image of a direction not visible from a vehicle that is about to enter an intersection, and transmits the picked-up image to the vehicle is installed in the vicinity of a blind intersection. In addition, an in-vehicle device that receives the image from the image pickup device, and displays the image on a display device is mounted in the vehicle. The in-vehicle device retrieves an image pickup device identification number of an image pickup device installed at the intersection that the vehicle is about to enter and transmits the retrieved image pickup device identification number to the image pickup device and, only when an image pickup device identification number received from the image pickup device together with an intersection image and the retrieved image pickup device identification number match with each other, the in-vehicle device displays the received intersection image.

Abstract: In a phase adjustment device according to the present invention, a first luminance level detector detects a luminance level of a digital imaging signal in a first pixel region, a second luminance level detector detects a luminance level of the digital imaging signal in a second pixel region, a data comparator compares detection results by the first and second luminance level detectors, an adjustment judger judges if it is necessary to adjust a phase of a pulse based on a result of the comparison by the data comparator, a timing adjuster shifts the phase of the pulse in the second pixel region when the luminance levels are detected, and further, the timing adjuster adjusts the phase of the pulse when the judgment by the adjustment judger indicates that the phase adjustment is necessary.