image #22090 original image ground truth-based border image Mumford & Shah (linear color space) visual inspection (λ=2048) best rand index  (λ=2048) best BGM  (λ=65536) rand index=0.0538 / BGM 0.2701 The result λ=1024 can't merge the sky, see it here, where rand index=0.1106 and BGM=0.4686 rand index=0.0538 BGM=0.1069 Mumford & Shah (adaptive color space) visual inspection (λ=128) best rand index  (λ=256) best BGM  (λ=16384) rand index=0.0529 / BGM 0.2967 rand index=0.0519 BGM=0.0395 Tensor properties and seeds used Graphs of similarity