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mattdm
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Understanding & Correcting Perspective Distortion Is distortion on an iPhone primarily due to perspective or does lens distortion play a part, and what can be done about it?

I am researching how to correct any facial distortions seen on an iPhone's front camera. Here is my current understanding of the issue: *close-up photos will enlarge nearer facial features such as nose and forehead, as a short camera distance will magnify the discrepancy in camera distance between different features (as opposed to far-away images in which the distance variation between features is 'diluted' due to the long camera distance) *even though close-up photos will distort images of 3D objects, there does not appear to be any distortion when photographing a 2D image such as a ruler *wide-angle lenses (as used in iPhones) can cause a barrel distortion effect on images taken at a close distance. I have tested this out but have not found any noticeable barrel distortion

  • close-up photos will enlarge nearer facial features such as nose and forehead, as a short camera distance will magnify the discrepancy in camera distance between different features (as opposed to far-away images in which the distance variation between features is 'diluted' due to the long camera distance)
  • even though close-up photos will distort images of 3D objects, there does not appear to be any distortion when photographing a 2D image such as a ruler
  • wide-angle lenses (as used in iPhones) can cause a barrel distortion effect on images taken at a close distance. I have tested this out but have not found any noticeable barrel distortion

Questions: *what is the root cause for image distortion on an iPhone? Is it solely due to perspective distortion, or does the wide-angle lens also play a role? *is my reasoning correct as to why there is no noticeable distortion for 2D images, regardless of camera distance? *what is the minimal camera distance at which point there will no longer be a distortion of facial features on an iPhone's front camera? *is the focal length different between the front and back cameras of an iPhone?

  • what is the root cause for image distortion on an iPhone? Is it solely due to perspective distortion, or does the wide-angle lens also play a role?
  • is my reasoning correct as to why there is no noticeable distortion for 2D images, regardless of camera distance?
  • what is the minimal camera distance at which point there will no longer be a distortion of facial features on an iPhone's front camera?
  • is the focal length different between the front and back cameras of an iPhone?

Understanding & Correcting Perspective Distortion on iPhone

I am researching how to correct any facial distortions seen on an iPhone's front camera. Here is my current understanding of the issue: *close-up photos will enlarge nearer facial features such as nose and forehead, as a short camera distance will magnify the discrepancy in camera distance between different features (as opposed to far-away images in which the distance variation between features is 'diluted' due to the long camera distance) *even though close-up photos will distort images of 3D objects, there does not appear to be any distortion when photographing a 2D image such as a ruler *wide-angle lenses (as used in iPhones) can cause a barrel distortion effect on images taken at a close distance. I have tested this out but have not found any noticeable barrel distortion

Questions: *what is the root cause for image distortion on an iPhone? Is it solely due to perspective distortion, or does the wide-angle lens also play a role? *is my reasoning correct as to why there is no noticeable distortion for 2D images, regardless of camera distance? *what is the minimal camera distance at which point there will no longer be a distortion of facial features on an iPhone's front camera? *is the focal length different between the front and back cameras of an iPhone?

Is distortion on an iPhone primarily due to perspective or does lens distortion play a part, and what can be done about it?

I am researching how to correct any facial distortions seen on an iPhone's front camera. Here is my current understanding of the issue:

  • close-up photos will enlarge nearer facial features such as nose and forehead, as a short camera distance will magnify the discrepancy in camera distance between different features (as opposed to far-away images in which the distance variation between features is 'diluted' due to the long camera distance)
  • even though close-up photos will distort images of 3D objects, there does not appear to be any distortion when photographing a 2D image such as a ruler
  • wide-angle lenses (as used in iPhones) can cause a barrel distortion effect on images taken at a close distance. I have tested this out but have not found any noticeable barrel distortion

Questions:

  • what is the root cause for image distortion on an iPhone? Is it solely due to perspective distortion, or does the wide-angle lens also play a role?
  • is my reasoning correct as to why there is no noticeable distortion for 2D images, regardless of camera distance?
  • what is the minimal camera distance at which point there will no longer be a distortion of facial features on an iPhone's front camera?
  • is the focal length different between the front and back cameras of an iPhone?
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Clay
Clay
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Understanding & Correcting Perspective Distortion on iPhone

I am researching how to correct any facial distortions seen on an iPhone's front camera. Here is my current understanding of the issue: *close-up photos will enlarge nearer facial features such as nose and forehead, as a short camera distance will magnify the discrepancy in camera distance between different features (as opposed to far-away images in which the distance variation between features is 'diluted' due to the long camera distance) *even though close-up photos will distort images of 3D objects, there does not appear to be any distortion when photographing a 2D image such as a ruler *wide-angle lenses (as used in iPhones) can cause a barrel distortion effect on images taken at a close distance. I have tested this out but have not found any noticeable barrel distortion

Questions: *what is the root cause for image distortion on an iPhone? Is it solely due to perspective distortion, or does the wide-angle lens also play a role? *is my reasoning correct as to why there is no noticeable distortion for 2D images, regardless of camera distance? *what is the minimal camera distance at which point there will no longer be a distortion of facial features on an iPhone's front camera? *is the focal length different between the front and back cameras of an iPhone?