Results of step 2 with and without the texture feature. (a) Processing results of data observed on 2016 January 28 at 19:32:06 UT with and without the texture feature. (b) Processing results of data observed on 2019 May 8 at 16:46:06 UT with and without the texture feature. In panels a and b, the first and second rows show the mask and contour of the results, and the first to third columns show the input image, results without the texture feature, and results with the texture feature, respectively. The green arrows indicate the additional umbra areas found by the algorithm with the texture feature.