Dennis Baldwin has published a number of videos on this subject on his YouTube channel: https://www.youtube.com/user/dennisbaldwin/videos 

He uses OpenDroneMap to stitch the images together and geo-reference them. One of his tutorials shows how to use Amazon EC2 cloud computing to accelerate the rendering process.

Commercial: Structure from Motion (SfM) software Agisoft, Pix 4D are good (demo and 'low cost' research licenses are available).

Opensource - Visual SfM, OpenDroneMap, MS Image Composite Editor (ICE) are all good.  ICE is image mosaic software but cannot generate DEM/DTM etc....

I'm getting good results with Agisoft Photoscan and Visual SfM using a 3DR x8+ and Canon GPS enabled SX260 camera.  You will need GNSS/GPS ground control in your images to increase the 3D spatial accuracy of both generated surface models and ortho outputs. Onboard camera GPS is good for 'rough' geo-location of image outputs.

Good luck! 

Data processing with Pix4D:

https://support.pix4d.com/hc/en-us/articles/205760125#gsc.tab=0

https://support.pix4d.com/hc/en-us/categories/200228639#gsc.tab=0

https://support.pix4d.com/hc/en-us/articles/202557969#gsc.tab=0

https://support.pix4d.com/hc/en-us/community/topics#gsc.tab=0

Article Poppy Crop Height and Capsule Volume Estimation from a Singl...

We used SfM-MVS image reconstruction approach with Agisoft PhotoScan software!

Hi

Yo can use the Agisoft Metashape software.After adding photos, select the workflow option and then choos aligh photo.

Good luck

You can do these using the automation methods in software like Agisoft photoscan or Metashape, Pix4D and the likes but.....

Kindly follow the steps in the attached file using Agisoft photoscan or Agisoft Metashape

Good luck.

Hi

I worked on UAV images.

There are softwares like Pix4Dmapper, UASMaster, Agisoft Metashape and ... .

  But I think the best software is Agisoft Metashape .

Your images must be geotags or position them.

With luck.