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Image edge detection based on low‐level feature is usually performed on gray‐scale images. Some methods have been developed for edge detection on colour images based on low‐level feature, but they are not consistent with human colour perception. This research provides a new algorithm for edge detection based on the “HyAB” large‐colour‐difference formula. This algorithm uses Sobel operators for gradient‐magnitude calculations and Canny methods for localizing edge points. The performance of the new algorithm is qualitatively compared with Sobal and Canny methods using some challenging colour images. The results indicate that gradient magnitudes are best calculated using the HyAB colour‐difference formula, and that CIELAB and CIEDE2000 differences are not suitable for this purpose. Definition of gradient magnitudes according human perception is essential in applications such as quality control of fabric printing, calculation of disruptive colouration, and so on. The new algorithm is successful in accuracy and fine edge detection in comparison with the Sobel and Canny methods. The new method is quantitatively compared with state‐of‐the‐art methods using three datasets including BSDS500, MBDD, and BIPED. The correctness and accuracy of annotations of images in datasets have an important effect on results. The new method does not reach scores better than deep‐learning‐based methods, but it is simple and does not need training. It could probably have better results with improving noise‐suppression.
Color Research & Application – Wiley
Published: Aug 1, 2020
Keywords: ; ; ; ;
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