Image analysis method for grading raw shiitake mushrooms

This paper presents the image analysis method for raw shiitake mushroom from image to shiitake grading to develop an automated system for grading a raw shiitake. Analysis pieces are the size of mushroom and the level of opening cap. Proposed method calculates the size of shiitake by using area sum of shiitake area and the rate of lamella area. To extract lamella area in image, proposed method uses the direction of gradient vector. The gradient vectors in lamella tend to be perpendicular in the vectors from the center of shiitake area. The test raw shiitake images which are categorized into 6 the level of opening cap classes and 4 size classes.