estimateGeometricTransform don't return the status

Question

In the Matlab's help about estimateGeometricTransform says, that this function may return the status if it have some error (for example 'matchedPoints1 and matchedPoints2 inputs do not contain enough points.') It should be written like this: ``` [___,status] = estimateGeometricTransform(matchedPoints1,matchedPoints2,transformType) ``` But in my case it doesn't work. ``` [tform, status] = estimateGeometricTransform(matchedBoxPoints, matchedScenePoints, ... 'projective'); ``` After that command I'm using 'IF'-statement for checking the status and if it's not equal one, I need to do some commands. But I just get the error in the console: MATCHED_POINTS1 and MATCHED_POINTS2 do not have enough points. and the program stops. What's wrong? ``` video = 'sample.avi'; hVideoSource = vision.VideoFileReader(video, 'ImageColorSpace', 'Intensity'); hVideoOut = vision.VideoPlayer('Name', 'Detected Box'); boxImage = imread('cross2.jpg'); boxImage = rgb2gray(boxImage); boxPoints = detectSURFFeatures(b…

Accepted Answer

There are other optional outputs before `status`:

```
[tform,inlierpoints1,inlierpoints2]  = estimateGeometricTransform(...)
```

The way you are calling the function, `status` actually contains `inlierPoints1`.

What you have to do to get the status and prevent the function from throwing an error is this:

```
[tform, ~, ~, status] = estimateGeometricTransform(matchedBoxPoints, matchedScenePoints, ...
     'projective');
```

A better way is to check the number of points before calling `estimateGeometricTransform`.

```
if size(boxPairs, 1) >= 3
   tform = estimateGeometricTransform(..., 'affine')
else
   % skip this frame
end
```

For projective, use 4 instead of 3.

estimateGeometricTransform don't return the status

Solution

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