“…How to segment the diseased leaves of crops with high efficiency and high quality is a research hotspot. In the last two decades, traditional image processing techniques, such as edge detection, color space transformation, feature space transformation, etc., were used to achieve the extraction and recognition of lesions [5,6]. Using the grayscale structure intensity histogram of channel H (from the HSV color space) and channel a (from the L*a*b* color space), one can find the pixel value that can best separate healthy and diseased tissues, and segment the lesions [7].…”