Hi, i'm trying to move further with my project of panorama stitching andoid app. Stitching horizontal images still need some improvements, but at the moment i'm satisfied. I got bigger problem with stitching vertical images (one above another).

Frome time to time it works fine: +

But more oftenly result image looks horrible: +

Can anyone give suggestions what i should check first? What might went wrong?

EDIT: Landscape scene examples +

EDIT: Another example. This time images were previously stitched and then i tried to make panorama putting one above the other. Results was completly wrong. +

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EDIT:

My problem, as stated above has been solved. Once again - big thanks to Harris. But there is another issue also connected to stitching vertical images. I guess it's better to continue my question here to get comprehensive problem answear.

I rotate two images (partial panoramas): .

Then I create object for result image:

size = com.googlecode.javacv.cpp.opencv_core.cvSize(640,480);
resultImage = com.googlecode.javacv.cpp.opencv_core.cvCreateImage(
    size,
    com.googlecode.javacv.cpp.opencv_core.IPL_DEPTH_8U, 
    1);

Loaded images and resultImage are passed as arguments to Stitcher.stitch method:

status = stitcher.stitch(images, resultImage);

As a result i get below image:

It's not the rule. Sometimes this method generates good panoramas, but unfortunately not always. It seems there something with image ratio goes wrong. Can anyone give me a hint what should I change?