MergePhotos

Android application for merging photos. Internaly it uses OpenCL.

• Panorama
• Aligned
• HDR
• Long Exposure
• Interpolation

Ideas:

• Inpaint
• Long exposure improuvements
• Focus stacking

Panorama

Needs minimum 2 photos.

Input Image 1	Input Image 2

Panorama: Plane	Panorama: Cylindrical	Panorama: Spherical

Aligned

Images are aligned based on the first image. Aligned images will fill with black missing pixels.

Input Image 1	Input Image 2	Input Image 3

Output Image 1 (same as Input Image 1)	Output Image 2	Output Image 3

HDR

Images are aligned before merging.

Input Image 1	Input Image 2	Input Image 3

Output

Long Exposure

Images are aligned before merging. Modes:

• Average: will make changes looks like ghosts.
• Nearest to Average (minimum 3 images): will make changes disapear.
• Light: keep lightest pixels
• Dark: keep darkest pixels

Input Image 1	Input Image 2	Input Image 3

Average	Nearest to Average

Interpolation

Linear (default)	Cubic	Area	Lanczos4

Lanczos4 looks to be the sharpest so I will switch from default to this one.

Ideas

Inpaint

When creating panoramas the result images have black borders.

Panorama	Mask

I tested opencv / opencv_contrib to fill this areas (the time it took is on my laptop not on adroid device):

NS	TELEA	SHIFTMAP	FSR FAST	FSR BEST
4.57 seconds	4.04 seconds	22.68 seconds	190.09 seconds	3086.39 seconds

From my point of view:

• SHIFTMAP: looks the best (at leat for my test images) but seems a little too slow for a android (to be tested)
• NS: looks OK and the time is decent
• TELEA: doesn't look great
• FSR (FAST & BEST): are too slow

Long exposure improuvements

If you capture 2-3 images of a waterfall the water don't look blurry enought. Try to add some blur / motion blur on areas that are different. (I need so take some interesting shots first.)