feat: get_ice_labels + tests

src/tilingutils.jl

@@ -267,8 +267,6 @@ function imhist(img, imgtype="uint8")
 end
 
 function get_image_peaks(arr, imgtype="uint8")
-    # TODO: add validation for arr: either uint8 0:255 or grayscale 0:1
-
     _, heights = imhist(arr, imgtype)
 
     locs, heights, _ = Peaks.findmaxima(heights)
@@ -277,5 +275,14 @@ function get_image_peaks(arr, imgtype="uint8")
     order = sortperm(heights; rev=true)
     locs, heights = locs[order], heights[order]
 
-    return locs, heights
+    return (locs=locs, heights=heights)
 end
+
+function get_ice_labels(ref_img::Matrix{RGB{N0f8}}, tile, factor, relaxed_thresholds)
+    cv = channelview(ref_img)
+    cv = [float64.(cv[i, :, :])[tile...] .* factor for i in 1:3]
+    mask_ice_band_7 = cv[1] .< relaxed_thresholds[1]
+    mask_ice_band_2 = cv[2] .> relaxed_thresholds[2]
+    mask_ice_band_1 = cv[3] .> relaxed_thresholds[3]
+    return mask_ice_band_7 .* mask_ice_band_2 .* mask_ice_band_1
+end

test/test-tilingutils.jl

@@ -6,7 +6,8 @@ using IceFloeTracker:
     to_uint8,
     get_brighten_mask,
     imbrighten,
-    get_image_peaks
+    get_image_peaks,
+    get_ice_labels
 using Random
 gots = get_optimal_tile_size
 
@@ -110,4 +111,14 @@ gots = get_optimal_tile_size
         @test sum(l[1:5]) == 324
         @test sum(h[1:5]) == 11
     end
+
+    @testset "get_ice_labels" begin
+        # regular use case applies landmask
+        ref_img = load(falsecolor_test_image_file)
+        tiles = get_tiles(ref_img; rblocks=8, cblocks=6)
+        tile = tiles[1]
+        factor = 255
+        thresholds = [10, 118, 120]
+        @test sum(get_ice_labels(ref_img, tile, 255, thresholds)) == 6515
+    end
 end