IntroductionCapturing 360 degree photos with the MiSphere 360 is very easy to do - the camera is just point-and-shoot, and the software on your mobile phone does all the rest. However, if you wish to do some more clever things, such as generate high dynamic range images, the software is lacking.
This note shows how to take bracketted photos with the camera, and merge them together into a single image and convert to a rectilinear photograph.
Take three photos using the Exposure Compensation set to +0, +1.5 and -1.5
|MiSphere Camera Exposure Compensation Settings|
|Three Bracketted Images|
Use Luminance HDR to generate a HDR image.
Load the three images into Luminance HDR.The exposure compensation should be automatically detected, but if not, assign the +1.5 to the brightest, and -1.5 to the darkest of the three images.
|Luminance HDR Load Images|
You will then be presented with the Luminance HDR main window.
- There are several different Tonemap operators you can select.
- The Result size by default is tiny (256 x 128 in this example).
Then, pick an image on the right that you think may be close to what you want.
- Manituk 08
Play around with the sliders, and click on Tonemap to update
When you've got something you like, hit Save As, and your image will be saved as a jpg. Pick 100% (i.e. no compression) when you save.
|Luminance HDR Drago Output|
Use Hugin to convert the fisheye images to a rectilinear oneYou may think that at this point, you can run the Mi Sphere Camera Windows program under Wine (it does work, by the way). Unfortunately, it refuses to process images that have been tampered with since they left the camera.
For this, you can make use of a project file. There are several available - I used the one available from: http://ez-team.com/xiaomi.html.
Copy the pto file into a directory, and open it with Hugin. It will prompt you for the file, so navigate to the jpg/tif file that was output from Luminance HDR.
|Hugin Panorama Stitching|
Then, in the Panorama Stitcher, you can Calculate the Optimal size, and stitch - this will give you a rectilinear output image.
|Example High Dynamic Range Output Image|