Fig. 1From: Photo-id of blue whale by means of the dorsal fin using clustering algorithms and color local complexity estimation for mobile devicesDifferent types of dorsal fin [12]: a triangular with straight edges; b triangular falcate and curved smoothly backward; c straight pointing up; d marked, different size and shape but showing obvious scare; e falcate curved backward; f hooked, large size, and highly curved backward; g mutilated, loss large portions, or completely mutilated; and h indefinite, not categorizedBack to article page