diff --git a/Lecture14/code/edge_detect.m b/Lecture14/code/edge_detect.m
new file mode 100644
index 0000000..a1ecd29
--- /dev/null
+++ b/Lecture14/code/edge_detect.m
@@ -0,0 +1,30 @@
+I=imread('pic4.png');
+I0=rgb2gray(I);
+subplot(231);
+imshow(I);
+
+BW1=edge(I0,'Roberts',0.16);
+subplot(232);
+imshow(BW1);
+title('Roberts')
+
+
+BW2=edge(I0,'Sobel',0.16);
+subplot(233);
+imshow(BW2);
+title('Sobel')
+
+BW3=edge(I0,'Prewitt',0.16);
+subplot(234);
+imshow(BW3);
+title('Prewitt');
+
+BW4=edge(I0,'LOG',0.012);
+subplot(235);
+imshow(BW4);
+title('LOG')
+
+BW5=edge(I0,'Canny',0.2);
+subplot(236);
+imshow(BW5);
+title('Canny');
\ No newline at end of file
diff --git a/Lecture14/code/ld.m b/Lecture14/code/ld.m
new file mode 100644
index 0000000..071cdc3
--- /dev/null
+++ b/Lecture14/code/ld.m
@@ -0,0 +1,13 @@
+f=imread('pic4.png');
+w = [2 -1 -1; -1 2 -1;-1 -1 2 ];
+g = imfilter(double(f),w);
+imshow(g)
+gtop = g(1:120,1:120);
+figure , imshow(gtop)
+gbot = g(end-119:end, end-119:end);
+figure,imshow(gbot)
+g = abs(g);
+figure,imshow(g)
+T = max (g(:));
+g = g >= T;
+figure, imshow(g)
diff --git a/Lecture14/code/nns.m b/Lecture14/code/nns.m
new file mode 100644
index 0000000..ca9c3e0
--- /dev/null
+++ b/Lecture14/code/nns.m
@@ -0,0 +1,22 @@
+clear all
+close all
+clc
+p=3;q=5;
+I0=imread('pic3.jpg');
+ii=1;
+I1=zeros(size(I0,1)*p/q,size(I0,2)*p/q,3);
+for i=1:q:size(I0,1)-1
+  jj=1;
+  for j=1:q:size(I0,2)-1
+    I1(ii:ii+p-1,jj:jj+p-1,:)=double(I0(i:2:i+q-1,j:2:j+q-1,:));
+    jj=jj+p;
+  endfor
+  ii=ii+p;
+endfor
+figure
+image(I0)
+% truesize
+figure
+image(uint8(I1))
+% truesize
+size(I0),size(I1)
\ No newline at end of file
diff --git a/Lecture14/code/pic1.jpg b/Lecture14/code/pic1.jpg
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diff --git a/Lecture14/code/pic2.jpg b/Lecture14/code/pic2.jpg
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diff --git a/Lecture14/code/pic3-1.png b/Lecture14/code/pic3-1.png
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diff --git a/Lecture14/code/pic3-2.png b/Lecture14/code/pic3-2.png
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diff --git a/Lecture14/code/pic3-3.png b/Lecture14/code/pic3-3.png
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diff --git a/Lecture14/code/pic3.jpg b/Lecture14/code/pic3.jpg
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diff --git a/Lecture14/code/pic4.png b/Lecture14/code/pic4.png
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