How to stitch UAV images using pix4D software?

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I just want to register UAV images side by side using pix4D software, but the problem is I don't have any GCPs. How do I get a mosaic where all the images are stitched properly?

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Images with Pix4d are typically referenced with geo-information (data tagged from INS/GPS and IMU). If this is not the case, there is no way for Pix4d to know where your images are in space. An alternative to geo-referenced images is to create Manual Tie Points. This is a tedious process and has an effect on accuracy + image distortion. Check out Pix4D tutorials on Youtube or Pix4d/FAQ's for how to tag your images with MTP's. Hope that helps & good luck.