How to interpolated depth map of an image. (meshgrid and gridData)

Hello I have an image and I need to map this deep interpolated image. Initially I use the following commands:

[Xq, Yq]=meshgrid(1:1:1024, 1:1:1024); Vq=gridData(Lm, Wm, Z, Xq, Yq); imshow(img); hold on mesh(Xq, Yq, Vq)

where Lm, Wm are the components forming the 2D points of the image, Z is the depth component, 1024 is the image length.

When I run these commands appear in my image and the grid on the image, but there are parts I do not like the grid and other parts that I like but do not appear. How do I manipulate the area of interpolated? Excuse me but I'm new to MatLab. And I appreciate greatly any help.

Jadiel