Add default params

configs/{default_hparams.yaml → default_params.yaml}

@@ -10,3 +10,7 @@ mask_hparams:
   min_mask_region_area: 25.0
   use_m2m: true
   multimask_output: true
+
+filter:
+  default_pixel_size: 8
+  default_solid_color: "#00FF00"