DESIGN AND MANUFACTURE OF PORTABLE STEREO PHOTOMETRIC DEVICE FOR FABRIC DENSITY MEASUREMENT
Photometric stereo method is a technique for obtaining three-dimensional surface information of objects from multiple images captured with different lighting directions. In general, the recording devices used in photometric stereo have large dimensions, which limit direct measurements in production...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/75483 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Photometric stereo method is a technique for obtaining three-dimensional surface information of objects from multiple images captured with different lighting directions. In general, the recording devices used in photometric stereo have large dimensions, which limit direct measurements in production sites or field locations where the objects are measured. Based on this limitation, a photometric stereo portable device was developed in this study. Photometric stereo portable has a cylindrical shape with d0iameter of 10 cm and height of 20 cm. It uses six LED’s with different lighting directions and a mini camera for image capture. In this study, photometric stereo portable device was used to measure fabric density. Three types of fabric were used as measurement objects: plain fabric, twill fabric, and satin fabric, each with different densities. The fabric images were captured six times with different lighting directions. These six images were reconstructed using photometric stereo algorithms to produce three-dimensional images. Furthermore, using the Gray Level Profile Method (GLPM), gray level profiles along the x-axis (warp profile) and y-axis (weft profile) were obtained from 3D reconstruction surface. Fabric density was determined by counting the number of peaks in the gray level profiles, while the true fabric density values were obtained manually. The measurement error values based on both fabric density measurement methods resulted in minimum and maximum values of 0% for plain fabric, 0% and 3,4% for twill fabric, and 3.7% and 17,39% for satin fabric.
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