표제지
목차
요약문 7
Abbreviations 10
제1장 서론 11
1.1. 연구 동기 11
1.2. 연구 동향 12
1.3. 제안하는 방법 13
제2장 본론 16
2.1. 영상 처리 기법 16
2.1.1. CFRC 이미지 취득 16
2.1.2. 이미지 특징 추출 18
2.1.3. 섬유 특징 추출 24
2.1.4. Unit cell 생성 및 2차원 특징 취득 27
2.2. CAD모델을 통한 Unit Cell 벡터 취득 방법 31
2.2.1. Unit cell 벡터 취득 32
2.2.2. Unit cell 3차원 특징 취득 35
제3장 실험 결과 37
3.1. Unit cell 2차원 특징 취득 알고리즘 정확도 평가 37
3.2. Unit cell 3차원 특징 취득 알고리즘 정확도 평가 40
3.3. 결과 가시화 43
제4장 결론 46
4.1. 결론 46
4.2. 추후 연구 47
참고문헌 48
Fig. 1. The schematic of CFRC unit cell acquisition process. 15
Fig. 2. The effect of light source location and intensity on CFRC. Acquisited CFRC image (a), Fickle shadows and light reflection errors due to bad... 17
Fig. 3. Convolution process with the gaussian low pass filter. 18
Fig. 4. Comparison between gaussian LPF used images and its LAT results. (a) is original grayscale image and (d) is its LAT result. (b) is image that... 20
Fig. 5. Pooling image (a) and Pooling image area calibration is used (b). 23
Fig. 6. Pooling problems caused by improper parameters setting. Max pooling image shows yarn area overlapping problem due to large pooling area... 23
Fig. 7. Visualized labeling image and feature ID color map. 24
Fig. 8. The schematic of feature rotation determination method. White box is background pixel, black box is feature pixel. Target labeling image(a),... 26
Fig. 9. The flowchart of the proposed yarn area linking method. 28
Fig. 10. The visualized sequence of CFRC unit cell creation. 29
Fig. 11. Example of CFRC unit cell creation sequence based on relationship between yarn linking array. 30
Fig. 12. CRFC linked labeling image(a) and unit cell image(b). 31
Fig. 13. The example of x-axis tangent vector acquisition method image. XZ plane is generated at x=0, y=0 position on blue STL surface to get its... 33
Fig. 14. The evaluation of suggested vector acquisition method using CFRC STL file. STL data is loaded on CFRC image(a) and vectors obtained... 34
Fig. 15. The schematic of 3D CFRC data extraction algorithm. 36
Fig. 16. The CFRC unit cell image and 2D geomatical features. Measurement of unit cell angle ϕi,1, ϕi,2, unit cell x length lx...[이미지참조] 37
Fig. 17. Manual unit cell angle measurement of ϕi,1 (a) and ϕi,2 (b).[이미지참조] 38
Fig. 18. The unit cells of a CFRP specimen with inclined angles of 0°(a), 10°(b), 20°(c),and 30°(d). Unit cell size comparison between each... 41
Fig. 19. The visualized color map of unit cell angle where draped on CFRC specimen. Unit cell shear angle is visualized by setting hue differently.... 44