Generate size-adjustable uniform grid for spatial calibration

Hi, everyone,

I took a tiff image of a dot array on a piece of white paper, the resolution of the camera is 1280 x 800.

After I use imread to read in and use imshow to show the tiff image in Matlab, I am now trying to generate a 2-D uniform grid and add it to the image.

In this way, I will have a better understand of the relative pixel location for each dot on the paper. Then I can calibrate the relationship between the pixel location (i,j)and spatial location(x,y).

Besides, if possible, I need to make one unit grid containing 6-8 pixels, and make the grid size adjustable in case I need to adjust the size for better calibration.

Now I am stuck in generating this size-adjustable 2-D uniform grid.

Can anyone help me please?

Thank you for your kind help

Answer 1

[Image Analyst]

I don't know why you'd need to generate a grid. Just calibrate against an object of known length in your scene. See my attached demo.

[Freelance Paraguay]

very good example!!