A measurement method for distinguishing the real contact area of rough surfaces of transparent solids using improved Otsu technique*
Song Bao-Jiang, Yan Shao-Ze†, Xiang Wu-Wei-Kai
Fig.#cod#x00A0;3. Images taken by the DSLR during the loading process: a F N #cod#x003D;4000 N at the loading process, b F N #cod#x003D;6000 N at the loading process, c F N #cod#x003D;8000 N at the loading process, d F N #cod#x003D;4000 N at the unloading process, e F N #cod#x003D;6000 N at the unloading process, f F N #cod#x003D;8000 N at the unloading process.