MATLAB: WHAT’S THE ALGORITH APPROACH FOR THE BELOW CODE

Question

clc;
clear all;
Photo='Resistor (1M).png';  %Resistor image path
RGB=imread(Photo);
matrixSize=size(RGB);
Y=matrixSize(1,1);
X=matrixSize(1,2);
x1 = Y;
Y=Y/2;
Y=round(Y);
for i=1:x1
    for t=1:X
        if RGB(i,t)<255
            Mask(i,t)=0;
        else
            Mask(i,t)=255;
        end
    end
end
figure, imshow(Mask)
for i=1:X
    if RGB(Y,i)==0 && RGB(Y,i,2)==0 && RGB(Y,i,3)==0
        Temp(i,1)='A';
    else
        Temp(i,1)=0;
    end
end
for i=1:X
    if RGB(Y,i)>=185 && RGB(Y,i,2)>=122 && RGB(Y,i,3)<=87
        Temp(i,1)='B';
    end
end
for i=1:X
    if RGB(Y,i)>=200 && RGB(Y,i,2)<=50 && RGB(Y,i,3)<=50
        Temp(i,1)='R';
    end
end
for i=1:X
    if RGB(Y,i)>=240 && RGB(Y,i,2)>=230 && RGB(Y,i,3)<=10
        Temp(i,1)='Y';
    end
end
for i=1:X
    if RGB(Y,i)<=140 && RGB(Y,i,2)<=140 && RGB(Y,i,3)>=200
        Temp(i,1)='D';
    end
end
for i=1:X
    if RGB(Y,i)==163 && RGB(Y,i,2)==73 &&RGB(Y,i,3)==164
        Temp(i,1)='V';
    end
end
for i=1:X
    if RGB(Y,i)==0 && RGB(Y,i,2)==255 &&RGB(Y,i,3)==0
        Temp(i,1)='G';
    end
end
j=1;
i1=0;
for i=1:X
    if Temp(i,1)~=0
        colorArray(1,j)=Temp(i,1);
        j=j+1;
        i1=i1+1;
    end
end
i1=floor(i1/3);
i2=floor(i1*2);
i3=floor(i2+i1);
j=1;
for i=1:X
    if Temp(i,1)~=0
        colorArray(1,j)=Temp(i,1);
        j=j+1;
    end
end
colorArray(1,1)= colorArray(1,floor(j/6));
colorArray(1,2)= colorArray(1,floor(j/3)+1);
colorArray(1,3)= colorArray(1,floor(j-2));
i=1;
for i=1:3
    if colorArray(1,i)==65      %black
        colorArray(1,i)=0;
    end
      if colorArray(1,i)==66      %brown
          colorArray(1,i)=1;
      end  
      if colorArray(1,i)==82      %red
          colorArray(1,i)=2;
      end
      if colorArray(1,i)==79      %orange
          colorArray(1,i)=3;
      end
      if colorArray(1,i)==89      %yellow
          colorArray(1,i)=4;
      end
      if colorArray(1,i)==71      %green
          colorArray(1,i)=5;
      end
      if colorArray(1,i)==68      %blue
          colorArray(1,i)=6;
      end
      if colorArray(1,i)==86      %violet
          colorArray(1,i)=7;
      end
      if colorArray(1,i)==72      %grey
          colorArray(1,i)=8;
      end
      if colorArray(1,i)==87      %white
          colorArray(1,i)=9;
      end
  end
       hundreds=power(10,colorArray(1,3));
       tens=colorArray(1,1)*10;
       ones=colorArray(1,2)*1;
       resistorValue=(tens+ones)*hundreds;
       if resistorValue>=1000 && resistorValue<1000000
           resistorValue=resistorValue/1000;
           fprintf('Resistor Value: %dk ohm',resistorValue);
       elseif resistorValue>=1000000
           resistorValue=resistorValue/1000000;
           fprintf('Resistor Value: %dM ohm',resistorValue);
       else
           resistorValue=(tens+ones)*hundreds;
           fprintf('Resistor Value: %d ohm',resistorValue);
       end
  figure, imshow(Photo);

Answer 1

The code classifies the RGB colors of pixels, most likely to identify the color codes on a resistor.

The code is poorly comments and therefore it cannot work reliably - at least its purpose can be guessed only. I would not use such code for serious work.

In addition is is poorly written. Example:

for i=1:x1
  for t=1:X
      if RGB(i,t)<255
          Mask(i,t)=0;
      else
          Mask(i,t)=255;
      end
  end
end

can be improved:

Mask = (RGB(1:x1, 1:X) == 255) * 255