[ptx] [ hugin-Feature Requests-978224 ] computing of barrel distortion

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Feature Requests item #978224, was opened at 2004-06-23 06:41
Message generated for change (Comment added) made by nobody
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Category: None
Group: None
Status: Open
Priority: 5
Submitted By: Stanislav Brabec (sbrabec)
Assigned to: Nobody/Anonymous (nobody)
Summary: computing of barrel distortion

Initial Comment:
Looking at GUI, it seems, that user has to add focal
length/crop factor, lenses type and barrel distortion.

I am not an expert on this type of mathematics, but
IMHO it should be possible to compute lenses barrel
distortion from following sourcs:

- lenses type and angle of view
- coordinates comparison of three well positioned
control points on two neighbour images.

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Comment By: Nobody/Anonymous (nobody)
Date: 2005-03-30 11:41

Message:
Logged In: NO 

Mmmm... Not really...

In my case, this information is extracted from exif fields
of the picture...

Every modern and good camera add a lot of information in
that exif info. Here is an example :

$ exiftags 2005-03-03_11-54-15.jpg
---------------------------------------------------
Equipment Make: Canon
Camera Model: Canon EOS 300D DIGITAL
Maximum Lens Aperture: f/4.5
Sensing Method: One-Chip Color Area
Lens Size: 18.00 - 55.00 mm
Firmware Version: Firmware Version 1.1.1
Serial Number: XXXXXXXXXXXXX
Owner Name: XXXXXXXXXXXXXX

Image-Specific Properties:

Image Orientation: Top, Left-Hand
Horizontal Resolution: 180 dpi
Vertical Resolution: 180 dpi
Image Created: 2005:03:03 11:54:15
Exposure Time: 1/250 sec
F-Number: f/16.0
ISO Speed Rating: 100
Lens Aperture: f/16.0
Exposure Bias: 0 EV
Flash: No Flash
Focal Length: 34.00 mm
Color Space Information: sRGB
Image Width: 3072
Image Height: 2048
Rendering: Normal
Exposure Mode: Manual
Scene Capture Type: Standard
Exposure Mode: Manual
Focus Type: Auto
Metering Mode: Center-Weighted
Sharpness: High
Saturation: High
Contrast: High
Digital Zoom: Unknown
Shooting Mode: Manual
Image Size: Large
Focus Mode: AI Focus
Drive Mode: Single
Flash Mode: Off
Compression Setting: Fine
Macro Mode: Unknown
White Balance: Auto
Image Number: 178-7818

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