그림. 1. 블록 유형 구분 알고리즘의 의사 코드 [6]. Fig. 1. Pseudo-codes of the block type classification algorithm [6].
그림. 2. 블록 유형 구분 알고리즘 기반 Canny edge detection의 블록 다이어그램. Fig. 2. Block diagram of Canny edge detection based on block type classification.
그림. 3. 512×512 해상도의 8비트 gray scale 테스트 이미지. Fig. 3. 8 bits gray scale test images of the 512×512 resolution.
그림. 4. 테스트 이미지를 이용한 블록 유형 구분 결과와 threshold (TH) 값 추출 결과. Fig. 4. Block type classification and threshold (TH) value extraction results using test images.
표. 1. 이미지/블록 유형별 threshold 값의 범위. Table. 1. Range of the threshold values within each block type and image.
References
- W. Kim, J. Lee, H. An, and J. Kim, "High-Pe rformance and Low-Complexity Image Pre-Pr ocessing Method Based on Gradient-Vector C haracteristics and Hardware-Block Sharing," Trans. Electr. Electron. Mater, (TEEM) , vol. 1 8, no. 6, pp. 320-322, Dec. 2017. https://doi.org/10.4313/TEEM.2017.18.6.320
- W. Kim, J. Lee, and H. An, "Gradient Magnitude Hardware Architecture based on Hardware Folding Design Method for Low Power Image Feature Extraction Hardware Design," Journal of Korea institute of information, electronics, and communication technology (KIIECT) , vol. 10, no. 2, pp. 141-146, Apr. 2017. https://doi.org/10.17661/JKIIECT.2017.10.2.141
- W. Kim, J. Lee, H. An, and B. Kim, "Image Filter Optimization Method based on common sub-expression elimination for Low Power Image Feature Extraction Hardware Design," Journal of Korea institute of information, electronics, and communication technology (KIIECT) , vol. 10, no. 2, pp. 192-197, Apr. 2017. https://doi.org/10.17661/JKIIECT.2017.10.2.192
- W. Kim, J. Lee, and H. An, "Low Complexity Gradient Magnitude Calculator Hardware Architecture Using Characteristic Analysis of Projection Vector and Hardware Resource Sharing," Journal of Korea institute of information, electronics, and communication technology (KIIECT), vol. 9, no. 4, pp. 414-418, Aug. 2016. https://doi.org/10.17661/JKIIECT.2016.9.4.414
- N. Otsu, "A threshold selection method from gray-level histograms," IEEE Trans. Syst., Man. Cybern., vol. 9, no. 1, pp. 62-66, Jan. 1979. https://doi.org/10.1109/TSMC.1979.4310076
- Q. Xu, S. Varadarajan, C. Chakrabarti, and L. J. Karam, "A Distributed Canny Edge Detector: Algorithm and FPGA Implementation," IEEE Trans. on Image Processing, vol. 23, no. 7, pp. 2944-2960, Jul. 2014. https://doi.org/10.1109/TIP.2014.2311656
- J. K. Su and R. M. Mersereau, "Post-processing for artifact reduction in JPEG-compressed images," in Proc. IEEE ICASSP, vol. 3, pp. 2363-2366, May. 1995.