What does the below line illustrate in finding bounding box coordinates?

I have obtained the code for finding the coordinates of bounding box.I could'nt understand the logic behind the code.Can anyone help me in understanding it?

I have attached the code.Please help me in understanding the code.

% // Calculate top left corner
topLeftCoords = bboxCoords(:,1:2);

% // Calculate top right corner
topRightCoords = [topLeftCoords(:,1) + bboxCoords(:,3) topLeftCoords(:,2)];

% // Calculate bottom left corner
bottomLeftCoords = [topLeftCoords(:,1) topLeftCoords(:,2) + bboxCoords(:,4)];

% // Calculate bottom right corner
bottomRightCoords = [topLeftCoords(:,1) + bboxCoords(:,3) ...
    topLeftCoords(:,2) + bboxCoords(:,4)];

% // Calculating the minimum and maximum X and Y values
finalCoords = [topLeftCoords; topRightCoords; bottomLeftCoords; bottomRightCoords];

Answer 1

[Image Analyst]

The form for the bounding box is [xLeft, yTop, width, height].

So to get the x on the right, you do

xRight = xLeft + width;

To get the y on the bottom row, you do

yBottom = yTop + height;

Knowing that you can get the (x,y) coordinates of any corner in the box.

[ezhil K]

How to calculate xLeft and yTop?

[ezhil K]

what does bboxCoords(:,1:2); indicate?

[Image Analyst]

Like I said, they're in the bounding box array - whatever you used to construct bboxCoords. Let's say you called it bbox

xLeft = bbox(1);
yTop = bbox(2);
width = bbox(3);
height = bbox(4);