open source pkg v1

pkg/OpenFace/matlab_version/face_detection/mtcnn/convolution.m

@@ -0,0 +1,24 @@
+function [ output_maps ] = convolution( input_maps, kernels, biases )
+%CONVOLUTION Summary of this function goes here
+%   Detailed explanation goes here
+
+    % If MatConvNet is not installed use Matlab (much slower)
+    if(exist('vl_nnconv', 'file') == 3)
+        output_maps = vl_nnconv(single(input_maps), kernels, biases);
+    else
+        n_filters = size(kernels, 4);
+
+        kernels2 = kernels(:,:,end:-1:1,:);
+        for i=1:n_filters
+            for n_in_maps=1:size(kernels,3)
+                kernels2(:,:,n_in_maps,i) = fliplr(squeeze(kernels2(:,:,n_in_maps,i)));
+                kernels2(:,:,n_in_maps,i) = flipud(squeeze(kernels2(:,:,n_in_maps,i)));
+            end
+        end
+        output_maps = [];
+        for i=1:n_filters
+            output_maps = cat(3, output_maps, convn(input_maps, kernels2(:,:,:,i), 'valid') + biases(i));
+        end    
+    end
+end
+