tokens: We compare the proposed enhancement method with the baseline RGB images , and popular state - of - the - art enhancement approaches : ( 1 ) guided filtering ( GF ) , ( 2 ) bilateral filtering ( BF ) , ( 3 ) image sharpening filter ( IMSHARP ) , ( 4 ) WLS , ( 5 ) fused BF and WLS filter ( BFWLSAVG ) .