how to make top half image white in the frame ??

I am having an RGB image and I want to make top region of the image filled with white color.. The above is the RGB image with frame size 640 * 480

I want the upper half to make it white..

Any suggestions are greatly appreciated..! Thanks

Answer 1

[Image Analyst]

Just set the values to 255:

[rows, columns, numberOfColorChannels] = size(rgbImage);
midRow = floor(rows/2);
rgbImage(1:midRow, :, :) = 255;
imshow(rgbImage);

[sai vallikat]

Many thanks for your fast and accurate response to my question...!

But in my case I want to do more white region

i.e. I want to specify the ROI(Region Of Intrest) manually to shade the region to white...

How can I do it ?

Many thanks, Sai Krishna

[Walter Roberson]

idx = find(roi_mask);
pane_size = size(rgbImage,1) * size(rgbImage,2);
rgbImage(idx) = 255;
rgbImage(idx + panesize) = 255;
rgbImage(idx + 2 * panesize) = 255;

[Image Analyst]

To specify manually the region of interest, you can use imrect(), if you want the user to be able to adjust the sides before confirmation, or you can use rbbox(), if you want it to take the drawn box immediately without confirmation. Then get row1, row2, col1, and col2 from what they drew and do

rgbImage(row1:row2, col1:col2, :) = 255;

[sai vallikat]

Hello sir,

That actually worked for me but I want to segment out the frame like this

out of the entire frame that is visible in the above image..!

Precisely I want to shade all the regions and take only the region of the pallet as I shown below ... I want to make other entire region white..

Thanks, Regards. sai

[Image Analyst]

I hope you understand that I can't write the entire app for you. If I were you, I'd use a combination of a texture filter, like stdfilt(), and color segmentation, like the demos in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Answer 2

[sai vallikat]

I tried this way it is working but is there any easy approach to do ??

if true
  % code
i = imread('2.png');
i(1:350, 1:640, :) = 255;
i(1:480, 1:220, :)=255;
i(1:480, 440:640, :) =255;
i(450:480, 220:440, :)= 255;
imshow(i)
end

[Image Analyst]

No, that's pretty much the best way, assuming you know the rows and columns like you do.