Contains Matlab Script for image pre-processing and Verilog Code for Image denoising using median filtering

Author: livebinary

matlab/Image_Pre_Processing.m

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+
+k=rgb2gray(imread('test.png'));
+J = imnoise(k,'salt & pepper',0.2);
+figure,imshow(k)
+figure,imshow(J)
+im=zeros(size(k)+2);
+B=zeros(size(k));
+ 
+        for x=1:size(k,1)
+            for y=1:size(k,2)
+                im(x+1,y+1)=J(x,y);
+            end
+        end
+        
+        fid=fopen('image.txt','w')
+         for x=1:size(im,1)
+            for y=1:size(im,2)
+                
+                fprintf(fid,'%s',dec2bin(im(x,y)));
+                fprintf(fid,'\n');   
+
+                
+            end
+         end
+        fclose(fid);

src/Compare.v

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+module compare(a,b,out1);
+input [7:0]a;
+input [7:0]b;
+output out1;
+reg out1;
+always@(a,b)
+begin
+if(a<b)
+out1=1'b1;
+else
+out1=1'b0;
+end
+endmodule

src/Median_Filtering.v

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+
+module median(s1,s2,s3,s4,s5,s6,s7,s8,s9,med);
+input [7:0]s1,s2,s3,s4,s5,s6,s7,s8,s9;
+output [7:0]med;
+wire [7:0]p1,p2,p3,p4,p5,p6,p7,p8,p9;
+sort9 a1(s1,s2,s3,s4,s5,s6,s7,s8,s9,p1,p2,p3,p4,p5,p6,p7,p8,p9);
+assign med=p5;
+endmodule
+
+
+
+

src/Mux.v

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+module mux(a,b,s,out1);
+input [7:0]a;
+input [7:0]b;
+input s;
+output [7:0]out1;
+reg [7:0]out1;
+always@(a,b,s)
+begin
+if(s==1'b1)
+out1=a;
+else
+out1=b;
+end
+endmodule

src/Sorter_2.v

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+module sorter_2(a,b,min,max);
+input [7:0]a;
+input [7:0]b;
+output [7:0]min;
+output [7:0]max;
+wire cmp;
+compare c1(a,b,cmp);
+mux m1(a,b,cmp,min);
+mux m2(b,a,cmp,max);
+endmodule

src/Sorter_4.v

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+module sort4(i1,i2,i3,i4,o1,o2,o3,o4);
+input [7:0]i1,i2,i3,i4;
+output [7:0]o1,o2,o3,o4;
+wire [7:0]m1,m2,m3,m4,w1,w2,w3,w4;
+sorter_2 a41a(i1,i2,m1,w1);
+sorter_2 ar1a(i3,i4,m2,w2);
+
+sorter_2 a2f1a(m1,m2,o1,w3);
+sorter_2 a3d1a(w1,w2,m4,o4);
+
+sorter_2 a3d1na(w3,m4,o2,o3);
+endmodule

src/Sorter_9.v

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+module sort9(in1,in2,in3,in4,in5,in6,in7,in8,in9,out1,out2,out3,out4,out5,out6,out7,out8,out9);
+input [7:0] in1,in2,in3,in4,in5,in6,in7,in8,in9;
+output [7:0] out1,out2,out3,out4,out5,out6,out7,out8,out9;
+wire [7:0]w1,w2,w3,w4,w5,w6,w7,w8,w9,w10,w11,w12,w13,w14,w15,w16;
+wire [7:0]m1,m2,m3,m4,m5,m6,m7,m8,m9,m10,m11,m12,m13,m14,m15,m16,l1,l2,l3,l4,l5,l6,l7;
+wire [7:0]in11,in22,in33,in44,in55,in66,in77,in88;
+
+sort4 j1(in1,in2,in3,in4,in11,in22,in33,in44);
+sort4 hj(in5,in6,in7,in8,in88,in77,in66,in55);
+sorter_2 a1(in11,in55,m1,w1);
+sorter_2 af(in33,in77,m2,w2);
+sorter_2 a2(in22,in66,m3,w3);
+sorter_2 a3(in44,in88,m4,w4);
+///////////////////stage 1 finished//////////////////////
+sorter_2 a4(w1,w2,m5,w5);
+sorter_2 ar(m1,m2,m6,w6);
+sorter_2 a2f(w3,w4,m7,w7);
+sorter_2 a3d(m3,m4,m8,w8);
+///////////////////stage 2///////////////////////
+sorter_2 a41(w5,w7,m9,w9);
+sorter_2 ar1(m5,m7,m10,w10);
+sorter_2 a2f1(w6,w8,m11,w11);
+sorter_2 a3d1(m6,m8,m12,w12);
+
+sorter_2 a3d12(m12,in9,out1,l1);
+sorter_2 a3d13(l1,w12,out2,l2);
+sorter_2 a3d1d(l2,m11,out3,l3);
+sorter_2 a3d1s(l3,w11,out4,l4);
+sorter_2 a3d1dd(l4,m10,out5,l5);
+sorter_2 a3d1ss(l5,w10,out6,l6);
+sorter_2 a3d1v(l6,m9,out7,l7);
+sorter_2 a3dg1(l7,w9,out8,out9);
+
+
+
+
+
+//////////////////stage 3///////////////////
+//assign out1=m12;
+//assign out2=w12;
+//assign out3=m11;
+//assign out4=w11;
+//assign out5=m10;
+//assign out6=w10;
+//assign out7=m9;
+//assign out8=w9;
+endmodule

tb/Testbench.v

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+////////////////////////////////testbench below/////////////////////////////////////
+
+module denois;
+
+reg unsigned [7:0]img[10000:1];
+wire  unsigned [7:0]new;
+integer i,file_id,file_id1,j,k;
+reg clk;
+
+initial
+begin
+file_id=$fopen("denoised_image.txt");
+file_id1=$fopen("fin.txt");
+$readmemb("img.txt",img); 
+end
+initial 
+begin
+i=0;
+j=0;
+k=1;
+clk=1'b0;
+end
+always 
+begin
+#10;
+clk=~clk;
+end
+always@(posedge(clk))
+begin
+i=i+1;
+j=j+1;
+#10 $fdisplay(file_id,"%d",new);
+end
+always@(i,j)
+begin
+if(j==99) begin
+i=100*k +1;
+j=1;
+k=k+1;
+if(k==99) begin $fclose(file_id);
+#1000000 $fdisplay(file_id1,"%d",1'd0);
+ $fclose(file_id1);
+ end
+end
+end
+median ma(img[i],img[i+1],img[i+2],img[i+100],img[i+101],img[i+102],img[i+200],img[i+201],img[i+202],new);
+endmodule
+
+
+//////////////////////////////////////////////////end///////////////////////////////////////