How to write the code for detect horizontal or vertical line?

I have an image that has a one line.

starting, I try to write the code to input my image , change rgb color to gray and crop the image. As the picture below

but I don't know how to write for detect that is a vertical line. if I found the threshold value of intensity of dark color it about 73

It's difficule because It's the first time I use Mablab for my research.

Come on to comment if you use to write it TT

Loveee ูู^^

I try to write it but I don't have the ideaTT

Answer 1

[Image Analyst]

I don't see any obvious lines in that image. But take a look at hough() or houghlines().

[Ajaree Rattanaharn]

it is a big line in 2D TT

[Image Analyst]

Again, I don't see a line. Why can't you draw it in red over your image?

What is your 2D TT? A photo of your Audi automobile? It's pretty much the only thing that comes up in Google for TT.

[zineb kaoudja]

I think he wants to know the orientation of this shape/object (the black area) is it horizontal or vertical?

[Image Analyst]

You can threshold and use regionprops to look at the width and height of the bounding box.

binaryImage = Igray < someValue; % Threshold/binarize image.
binaryImage = bwareafilt(binaryImage, 1); % Extract largest blob.
props = regionprops(binaryImage, 'BoundingBox'); % Measure boundign box.
width = props.BoundingBox(3);
height = props.BoundingBox(4);
if height > width
        % Blob is vertical
end