how to remove the tiny white pixels around the rectangles

How can i remove the tiny pixels around the rectangles in the image attached. attached images.

Answer 1

[Kevin Holly]

Img = imread('originalImage.png');
imshow(Img)

You can also filter based on area of objects

Img = bwareafilt(imbinarize(Img),4,'largest'); % keep the 4 largest objects
imshow(Img)

[Pravindkumaran Baskaran]

i got till the second image but i'm trying to get those dots around the boxes away

Answer 2

[Matt J]

imopen(yourImage,ones(3))

Answer 3

[Image Analyst]

Depends on exactly what that means.

1. Do you want to simply remove small blobs?
2. Or do you also want to remove a small protrusion that is sticking out of the side of a much larger rectangle.

For case 1 you can use bwareaopen or bwareafilt

For case 2 you might try imopen, though be careful for changes to the shape you don't want, especially near the corners or protruding blobs.