路面破损图像系统（SIS）
路面破损图像系统（SIS）是高分辨率路面图像拍摄系统，用于检测和分析路面破损。利用线扫描技术，SIS可在正常交通速度行驶时采集公路路面图像。
While recording, the pavement is illuminated with a highly efficient flashing diode lamp configuration overcoming any shadows caused by sunlight. The system can be operated as a standalone system or synchronised with other equipment.
连续的无失真图像
To obtain sharp images an array of high-power flashing LEDs is used. For every 1mm the vehicle moves (depending on the resolution), the LED light makes a flash with a strength many times stronger than the sunlight, which removes shadows cast due to the sun.
The camera is triggered simultaneously and each line from the camera is added to the previous lines to make up one long continuous image. This eliminates the overlap algorithms that combine standard single frames.
连续的图像存储在计算机内，用时间和距离标记，从而定位图像每一部分的精确位置。
特点
- Continuous undistorted image of the road surface, exported to user defined image sizes.
- Based on best image sensors on the market.
- Homogeneous illumination with less than ±5 DN variation over entire image width, i.e. no lines/areas with brighter or darker illumination.
- Independent of sunlight, i.e. no shadow casts, from e.g. road signs or bridges.
- Includes Greenwood Engineering’s own LED-based lamps for strong image illumination, several times stronger than sunlight.
- Typical configuration: 4-meter-wide image with a resolution of 1mm pixel size.
- Driving speed as high as undisturbed traffic.