Obtaining RGB in the same size and visual field as thermal

[nuriaamenabar]

Hello, we are trying to create a mask using the RGB picture and then superpose this mask with the thermal data. However, the thermal image has a smaller visual field and is smaller than the extracted RGB one. Is there any way to know which transformations need to be applied to the RGB in order to match the thermal one, or to extract the adequate RGB image directly?

Thank you in advance.