How to export the data corresponding to the new pixel size?

Hi,

I have image data with 100*100 (pixel x pixel) and the pixel size is 10. Each pixel has a resulted value e.g., temperature

Now I would like to change the pixel size to 5 and still keep the same size of the image.

I wonder how to get the new image data (X, Y, and temperature) corresponding to the pixel size 5.

I really appreciate your help.

Thanks

Answer 1

[Rik]

doc imresize

[Francesco]

Thanks.

However, the input for the "imresize" function is seemly the image. I am talking about "the image data" and need to get the new data exported relevant to the new pixel size.

[Rik]

Can you explain the difference between image and image data? Because your descriptions sounds like you have 100*100 and want 200*200 (because you want to keep the same (actual?) size image and want to halve the physical size each pixel describes).

[Francesco]

I am sorry if I made you confused.

The image data I meant is the TXT file containing the X-, Y-coordinate of each point and its temperature value. We can calculate the pixel size from the coordinates.

The image is the PNG, JPG, etc format files

Yes, I have the data 100*100 and want it to become 200*200 with the same (actual) size image. I need to obtain the image data of the 200*200 picture.

[Rik]

Then you don't actually have an image, but gridded (or scattered) X,Y,Z data. You can either interpolate with the normal interpolation tools, or convert your coordinates to a grid of integer positions and use that to fill a matrix so you can use imresize.

[Francesco]

Awesome. Thanks for your help. Solved it.