dc.description.abstract | With the society of Taiwan develops rapidly, the roads develop rapidly, too. In the condition that all kinds of roads in Taiwan developed well, the road projects changed from the roads are going up to the roads are maintained and managed. The maintaining and managing department’s business changes form checked before acceptance to surveyed the pavement condition. It’s helpful to maintain and manage all kinds of cracks and conditions about the pavement and provide high service quality to service the public. Surveying Pavement Condition Index is the most important thing in the pavement condition surveys by the standard of ASTM D 6433-99. It’s main surveying completeness of the pavement structure and the condition of the surface service quality to provide objective and reasonable foundation for the policies of maintaining and managing the pavement.
The most traditional way of the PCI surveys is that PCI is recorded by writing and determination the condition through visual surveys.It needs quantities of manpower and time to survey,and men measuring at a section of a highway was not took safe problem into account. Therefore,I apply Line scan CCD camera to proceed pavement distress image survey aiming at racking , patching,potholes and the opening in this study.The triggering time of capturing is integrated with the distance measurement instrument(DMI),and the capturing images are stored in the computer. The images are processing rapidly employing the technique of image processing,and make the distress which is conspicuous Then,grading the distress is in place of Surveying and measuring on the spot.All distress data is compiled statistics and recorded.Finally,the data is keyed into a program and determine automatically.We can be aware of pavement condition.
In this study,I apply line scan CCD camera mounted at the back of the car and take a picture perpendicularly.I analyze the image.I discuss about solution for various factors and settle on the best condition of picturing.Finally,I propose that the diaphragm is F2.8 and the focal length is one meter.The camera is mounted at the height of two meters and picture the pavement in the width of 3.5 meters.The collecting image tested and verified whether the image is completeness or not and whether the image is clear or not. In addition,I measure on the spot and the data is keyed into a program. We can be aware of pavement condition. Compare the survey of manpower with this system in the study and verify the accuracy of the system.Therefore,I apply line scan CCD camera in the pavement distress image survey successfully. | en_US |