mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
4.0 KiB
115 lines
4.0 KiB
High level stitching API (Stitcher class) {#tutorial_stitcher} |
|
========================================= |
|
|
|
Goal |
|
---- |
|
|
|
In this tutorial you will learn how to: |
|
|
|
- use the high-level stitching API for stitching provided by |
|
- @ref cv::Stitcher |
|
- learn how to use preconfigured Stitcher configurations to stitch images |
|
using different camera models. |
|
|
|
Code |
|
---- |
|
|
|
This tutorial code's is shown lines below. You can also download it from |
|
[here](https://github.com/opencv/opencv/tree/master/samples/cpp/samples/cpp/stitching.cpp). |
|
|
|
@include samples/cpp/stitching.cpp |
|
|
|
Explanation |
|
----------- |
|
|
|
The most important code part is: |
|
|
|
@code{.cpp} |
|
Mat pano; |
|
Ptr<Stitcher> stitcher = Stitcher::create(mode, try_use_gpu); |
|
Stitcher::Status status = stitcher->stitch(imgs, pano); |
|
|
|
if (status != Stitcher::OK) |
|
{ |
|
cout << "Can't stitch images, error code = " << int(status) << endl; |
|
return -1; |
|
} |
|
@endcode |
|
|
|
A new instance of stitcher is created and the @ref cv::Stitcher::stitch will |
|
do all the hard work. |
|
|
|
@ref cv::Stitcher::create can create stitcher in one of the predefined |
|
configurations (argument `mode`). See @ref cv::Stitcher::Mode for details. These |
|
configurations will setup multiple stitcher properties to operate in one of |
|
predefined scenarios. After you create stitcher in one of predefined |
|
configurations you can adjust stitching by setting any of the stitcher |
|
properties. |
|
|
|
If you have cuda device @ref cv::Stitcher can be configured to offload certain |
|
operations to GPU. If you prefer this configuration set `try_use_gpu` to true. |
|
OpenCL acceleration will be used transparently based on global OpenCV settings |
|
regardless of this flag. |
|
|
|
Stitching might fail for several reasons, you should always check if |
|
everything went good and resulting pano is stored in `pano`. See |
|
@ref cv::Stitcher::Status documentation for possible error codes. |
|
|
|
Camera models |
|
------------- |
|
|
|
There are currently 2 camera models implemented in stitching pipeline. |
|
|
|
- _Homography model_ expecting perspective transformations between images |
|
implemented in @ref cv::detail::BestOf2NearestMatcher cv::detail::HomographyBasedEstimator |
|
cv::detail::BundleAdjusterReproj cv::detail::BundleAdjusterRay |
|
- _Affine model_ expecting affine transformation with 6 DOF or 4 DOF implemented in |
|
@ref cv::detail::AffineBestOf2NearestMatcher cv::detail::AffineBasedEstimator |
|
cv::detail::BundleAdjusterAffine cv::detail::BundleAdjusterAffinePartial cv::AffineWarper |
|
|
|
Homography model is useful for creating photo panoramas captured by camera, |
|
while affine-based model can be used to stitch scans and object captured by |
|
specialized devices. |
|
|
|
@note |
|
Certain detailed settings of @ref cv::Stitcher might not make sense. Especially |
|
you should not mix classes implementing affine model and classes implementing |
|
Homography model, as they work with different transformations. |
|
|
|
Try it out |
|
---------- |
|
|
|
If you enabled building samples you can found binary under |
|
`build/bin/cpp-example-stitching`. This example is a console application, run it without |
|
arguments to see help. `opencv_extra` provides some sample data for testing all available |
|
configurations. |
|
|
|
to try panorama mode run: |
|
``` |
|
./cpp-example-stitching --mode panorama <path to opencv_extra>/testdata/stitching/boat* |
|
``` |
|
 |
|
|
|
to try scans mode run (dataset from home-grade scanner): |
|
``` |
|
./cpp-example-stitching --mode scans <path to opencv_extra>/testdata/stitching/newspaper* |
|
``` |
|
 |
|
|
|
or (dataset from professional book scanner): |
|
``` |
|
./cpp-example-stitching --mode scans <path to opencv_extra>/testdata/stitching/budapest* |
|
``` |
|
 |
|
|
|
@note |
|
Examples above expects POSIX platform, on windows you have to provide all files names explicitly |
|
(e.g. `boat1.jpg` `boat2.jpg`...) as windows command line does not support `*` expansion. |
|
|
|
See also |
|
-------- |
|
|
|
If you want to study internals of the stitching pipeline or you want to experiment with detailed |
|
configuration see |
|
[stitching_detailed.cpp](https://github.com/opencv/opencv/tree/master/samples/cpp/stitching_detailed.cpp) |
|
in `opencv/samples/cpp` folder.
|
|
|