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DEVELOPMENT OF DIGITAL IMAGE-PROCESSING ALGORITHM TO COMPUTE UNIFIED CRACK INDEX FOR SALT LAKE CITY.
| 题名： | DEVELOPMENT OF DIGITAL IMAGE-PROCESSING ALGORITHM TO COMPUTE UNIFIED CRACK INDEX FOR SALT LAKE CITY. |
| 作者： | Jitprasithsiri-S; Lee-H; Sorcic-RG; Johnston-R |
| 关键词： | IMAGE-PROCESSING; ALGORITHMS-; PAVEMENT-CRACKING; CRACK-INDEXES; SALT-LAKE-CITY-UTAH; DIGITAL-IMAGE-ANALYSIS; COMPARISONS-; MANUAL-RATINGS; PAVEMENT-DISTRESS; CONDITION-SURVEY; AUTOMATION- |
| 摘要： | This paper presents the recent efforts in developing an image processing algorithm for computing a unified pavement crack index for Salt Lake City. The pavement surface image covers a pavement area of 2.13 m (7 ft) x 1.52 m (5 ft), taken at every 30-m (100-ft) station. The digital images were then transferred onto a 1-gigabyte hard disk from a set of memory cards each of which can store 21 digital images. Approximately 1,500 images are then transferred from the hard disk to a compact disc. The image-processing algorithm, based on a variable thresholding technique, was developed on a personal computer to automatically process pavement images. The image is divided into 140 smaller tiles, each tile consisting of 40 x 40 pixels. To measure the amount of cracking, a variable threshold value is computed based on the average gray value of each tile. The program then automatically counts the number of cracked tiles and computes a unified crack index for each pavement image. The crack indexes computed from the image-processing algorithms are compared against the manual rating procedure in this paper. The image-processing algorithms were applied to process more than 450 surveyed miles of Salt Lake City street network. |
| 总页数： | Transportation Research Record. 1996. (1526) pp142-148 (1 Phot., 6 Fig., 1 Tab., 42 Ref.) |
| 报告类型： | 科技报告 |
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