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Convert HSI Image to RGB Image


CONVERT HSI IMAGE TO RGB IMAGE:



Refer How to convert the RGB image to HSI Image


MATLAB CODE:





 figure,imshow(HSI);title('HSI Image');  
 %Obtain the Hue, Saturation and Intensity components  
 H1=HSI(:,:,1);  
 S1=HSI(:,:,2);  
 I1=HSI(:,:,3);  
    
   







 %Multiply Hue by 360 to represent in the range [0 360]  
 H1=H1*360;                                               
    


 %Preallocate the R,G and B components  
 R1=zeros(size(H1));  
 G1=zeros(size(H1));  
 B1=zeros(size(H1));  
 RGB1=zeros([size(H1),3]);  
    


 %RG Sector(0<=H<120)  
 %When H is in the above sector, the RGB components equations are  


    
 B1(H1<120)=I1(H1<120).*(1-S1(H1<120));  
 R1(H1<120)=I1(H1<120).*(1+((S1(H1<120).*cosd(H1(H1<120)))./cosd(60-H1(H1<120))));  
 G1(H1<120)=3.*I1(H1<120)-(R1(H1<120)+B1(H1<120));  


    
 %GB Sector(120<=H<240)  
 %When H is in the above sector, the RGB components equations are  


    
 %Subtract 120 from Hue  
 H2=H1-120;  


    
 R1(H1>=120&H1<240)=I1(H1>=120&H1<240).*(1-S1(H1>=120&H1<240));  
 G1(H1>=120&H1<240)=I1(H1>=120&H1<240).*(1+((S1(H1>=120&H1<240).*cosd(H2(H1>=120&H1<240)))./cosd(60-H2(H1>=120&H1<240))));  
 B1(H1>=120&H1<240)=3.*I1(H1>=120&H1<240)-(R1(H1>=120&H1<240)+G1(H1>=120&H1<240));  


    
 %BR Sector(240<=H<=360)  
 %When H is in the above sector, the RGB components equations are  


    
 %Subtract 240 from Hue  
 H2=H1-240;  


    
 G1(H1>=240&H1<=360)=I1(H1>=240&H1<=360).*(1-S1(H1>=240&H1<=360));  
 B1(H1>=240&H1<=360)=I1(H1>=240&H1<=360).*(1+((S1(H1>=240&H1<=360).*cosd(H2(H1>=240&H1<=360)))./cosd(60-H2(H1>=240&H1<=360))));  
 R1(H1>=240&H1<=360)=3.*I1(H1>=240&H1<=360)-(G1(H1>=240&H1<=360)+B1(H1>=240&H1<=360));  


    
 %Form RGB Image  
 RGB1(:,:,1)=R1;  
 RGB1(:,:,2)=G1;  
 RGB1(:,:,3)=B1;  


    
 %Represent the image in the range [0 255]  
 RGB1=im2uint8(RGB1);  
 figure,imshow(RGB1);title('RGB Image');  
    
   





  





















Explanation











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5 comments:

praveena puppy said... Reply to comment


Hey, nice site you have here! Keep up the excellent work!

Image Processing


郭枫 said... Reply to comment

Good job!

durre shehwar said... Reply to comment

Really helpful blog..Keep it up... (Y)

Adnan Gul said... Reply to comment

It gives me following error.
Undefined function 'cosd' for input arguments of
type 'uint8'.

Error in hsi2rgb2 (line 29)
R1(H1<120)=I1(H1<120).*(1+((S1(H1<120).*cosd(H1(H1<120)))./cosd(60-H1(H1<120))));
can yo please help me with this i m just a beginner

Aaron Angel said... Reply to comment

@Adnan Gul

H1 should be of type 'double' in order to use the function 'cosd'
Use the below line:
H1 = double(H1);

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