k-matrix and intrinsic parameters

[ZiadMansourM]

Parameters like focal length are encoded inside pictures taken from iPhone. The focal length is stored in the EXIF data of the image. To load the EXIF data of an image in Python, you can use the following code:

import exifread

# Open the image file
image = open("image.jpg", "rb")

# Read the EXIF data
exif = exifread.process_file(image)

# Get the focal length
focal_length = exif["Image/FocalLength"]

# Print the focal length
print(focal_length)

This code will print the focal length of the image in millimeters. For example, if the focal length is 28mm, the code will print "28".

Here is a table of some of the EXIF tags that may be present in iPhone images:

Tag	Description
Image/FocalLength	Focal length of the lens in millimeters
Image/DateTimeOriginal	Date and time the image was taken
Image/GPSInfo	GPS coordinates of the image
Image/Make	Make of the camera
Image/Model	Model of the camera

You can find a more complete list of EXIF tags here: https://exiftool.org/TagNames/EXIF.html