Lesson 8/11 and fixed spelling error in prev lesson

11-3/readyalefaces_to_tensor.jl

@@ -0,0 +1,39 @@
+using Images, GIFImages
+
+function readyalefaces_to_tensor(str::String="all")::Tuple{Array, Array{String}}
+    # output (F, descr)
+
+    nindividuals = 15
+
+    if str == "easy"
+        extensions = ["happy", "normal", "sad", "sleepy", "surprised", "wink"]
+    elseif str == "easy-nowink"
+        extensions = ["happy", "normal", "sad", "sleepy", "surprised"]
+    elseif str == "nowink"
+        extensions = ["centerlight", "glasses", "happy", "leftlight", "noglasses", "normal", "rightlight", "sad", "sleepy", "surprised"]
+    elseif str == "hard" || str == "all"
+        extensions = ["centerlight", "glasses", "happy", "leftlight", "noglasses", "normal", "rightlight", "sad", "sleepy", "surprised", "wink"]
+    else
+        throw(ArgumentError("unknown selector"))
+    end
+
+    F = Array{Float32}(undef, (243, 320, length(extensions), nindividuals))
+    
+    for i ∈ 1:nindividuals
+        basename = joinpath(@__DIR__, "yalefaces/subject")
+        if i < 10
+            basename *= "0" * string(i)
+        else
+            basename *= string(i)
+        end
+    
+        for j = 1:length(extensions)
+            fullname = basename * "." * extensions[j] * ".gif"
+            X = Gray.(gif_decode(fullname))
+            F[:, :, j, i] = X[:,:,1] # just the first frame of the gif (should have only one in total)
+        end
+    end
+    descr = extensions
+
+    (F, descr)
+end