Android: Real time image processing using OpenCV 3.0

Publicado em: 23 Julho 2015
no canal de: Matthias Buschmann

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OpenCV 3.0 comes with some new interesting filters for non - photorealistic image rendering.

The app captures the android camera preview and offers a menu
for real time image processing. The menu points are:

(Plain Preview) shows the camera preview (the unprocessed image), 15 FPS at 480x320 pixels

(EPF) shows a result of the new EdgePreservingFilter,
the filter blurs the image but preserves the edges

(Canny) is the well known Canny-filter (edge finding filter, NOT new
in OpenCV 3.0), result is inverted (dark edges)

(EPF + Canny) shows a combination of the edge preserving filter and the Canny edges : this results in a nice cartoon-like effect

(Stylization) : A new filter in OpenCV 3.0, depending on the parameters you get from cartoon-like to water color effects

(Pencil Sketch) : This new filter produces an output that looks like a pencil sketch. Very dark parts of the image become white. The reason for that is unknown to me.

Depending on the filter type the framerate (FPS) drops significantly. Especially the Stylization-filter is quite slow.

App created with Eclipse (4.5) and OpenCV 3.0 (OpenCV4Java)
Device : Nexus 7 (2013), not rooted
filmed with Panasonic Lumix FS16

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