Edge detection in color (RGB) images

Edge detection in color (RGB) images using sobel filtering and Fourier transform for Quaternions.

Sobel horizontal and vertical

Correlate sobel horizontal and vertical

References

• [1] Beijing Chen, Gouenou Coatrieux, Gang Chen, Xingming Sun, Jean Louis Coatrieux, Huazhong Shu, Full 4-D quaternion discrete Fourier transform based watermarking for color images, Digital Signal Processing, Volume 28, 2014, Pages 106-119, ISSN 1051-2004, https://doi.org/10.1016/j.dsp.2014.02.010.
• [2] Bahri, Mawardi & Ashino, R. & Vaillancourt, R.. (2013). Convolution and correlation based on discrete quaternion Fourier transform. Information (Japan). 16. 7837-7848.