estgeotform2d Not all transformType arguments are available?

Hi,

I have a time series of images that have a translation with no rotation (it's a fixed stage in the rotation axis) that I need to align. So far I'm having great success with using detectSIFTFeatures and then aligning matched pairs with estgeotform2d, with the transformType set to "rigid". However, sometimes this introduces a rotation, and so a "translation" transformType would be better. But when I try this I get an error?

estgeotform2d(matchedDistorted,matchedOriginal,'translation')

Error using vision.internal.geotrans.parseEstimateGeometricTransform>checkTransformType2d

Expected TransformType to match one of these values:

'rigid', 'similarity', 'affine', 'projective'

The input, 'translation', did not match any of the valid values.

Error in vision.internal.geotrans.parseEstimateGeometricTransform (line 67)

[sampleSize, tformType] = checkTransformType2d(char(transformType), fileName);

Error in vision.internal.geotrans.algEstimateGeometricTransform (line 31)

vision.internal.geotrans.parseEstimateGeometricTransform(statusCode,...

Error in estgeotform2d (line 11)

vision.internal.geotrans.algEstimateGeometricTransform(...

The documentation clearly states that "translation" is an option (since R2022b): https://au.mathworks.com/help/vision/ref/estgeotform2d.html

But then if I click on the link in the error message it says that "translation" is not an option?

Do I need to update something? It seems my Matlab (2023b) has less functionallity?

Thanks in advance.

Answer 1

[Walter Roberson]

You are looking at the R2024a documentation, but you are using R2023b.

(That and the fact that the R2024a documentation misses out noting the change in the change summary section.)

[Michael Jones]

Thanks, this is what I suspected. It would be creat if this was noted somewhere...

I guess I'll see when my institution plans on rolling out 2024a