Extract time-amplitude signals to a matrix from a png

How can I extract the a-scan (time- amplitude) signals from a grayscale png. to a matrix?

Answer 1

[Swetha Polemoni]

Hi

It is my understanding that you want to get the x and y coordinates of few points from image.

1. Read the image using imread.
2. Display the image using imshow.
3. You may use imbinarize to convert your image to binary image if needed.
4. Click on the image points whose x and y coordinates needs to be calculated using ginput.