Image Zooming – Part 1

Let’s try to view an Image of size 1366 x 768.

To view the image:

I = imread('Vatican-City-Wallpaper_.jpg');

figure,imshow(I);

Reference:

Vatican City Wallpaper - HD Wallpapers

The image is too big. I want to view the image part by part, so that I can view the details in the image more clearly.

Method one:

I use MATLAB function ‘imshow’ and the ‘figure’ command.

To view the image:

I = imread('Vatican-City-Wallpaper_jpg');

figure,imshow(I);

Now click the ‘zoom in’ option to enlarge the image.

ZOOM IN

Click the ‘pan’ option and drag the cursor to view the image part by part.

 

PAN OPTION

Method two:

We can do the image viewing using our own code instead of using ‘zoom in’ and ‘pan’ options.

We will define our own window and display the image alone.

%Read the Image

I=imread('Vatican-City-Wallpaper_.jpg');

Im=I;

%Get the Screen size and define the window

scrsz = get(0,'ScreenSize');

figure('Position',[300 50 scrsz(3)-600 scrsz(4)-200],'Menu','none','NumberTitle','off','Name','VIEW PHOTO','Resize','off');

%Size of the Image Portion

Len=round(size(I,1)/4);

Flag=1;

x=1;

wid=Len;

y=1;

ht=Len;

%Display the image

ax=axes('Position',[0 .1 1 .8],'xtick',[],'ytick',[]);

imshow(Im(x:wid,y:ht,:));

Num=50;

while(Flag==1)

try

    %User button click

    waitforbuttonpress;

    pt=get(ax,'CurrentPoint');

    y1=round(pt(1,1));

    x1=round(pt(1,2));

   

    %Calculate the Next part of the image based on the button press

    if( x1 < Len && x1 > 0 && y1 < Len && y1 > 0)

   

    x=x+x1;

    y=y+y1;

    if(x-Num>1)

      

        x=x-Num;

    end

   

    if(y-Num>1)

      

        y=y-Num;

    end

   

    if(x+wid>size(I,1))

      

        x=size(I,1)-wid;

    end

   

    if(y+ht>size(I,2))

      

        y=size(I,2)-ht;

    end

   %New Image Part

   imshow(Im(x:x+wid,y:y+ht,:));

  

   wid=Len;

   ht=Len;

  

    end

catch

    Flag=0;

end

end

 

Click on the bottom right part of the image to view the center part

Click to the right from the above mentioned part