A representative image of biceps from the previous reports [[3, 5]] and corresponding MFO results. (a) The original image. (b) The image after MVEF. (c) The image after binarization, where red, blue and green regions denote the typical RA, RB and RC respectively. (d) MFO detection results, where the angle of red line was detected using HT and the angle of yellow line was estimated as the orientation of the ellipse that has the same second-moments as the region.