Add small useful nodes

[imagejan]

As long as knip-scripting isn't released yet, these nodes would be nice to have:

• Pad image (with optional {top,center,bottom} alignment for each axis), see Gitter
• Flip images on a given axis (the current Flip horizontally fails with 1D images and ignores two pixel rows on 2D images), see Gitter
• Single pixel labeling: convert each white pixel in a binary image to a unique label in a Labeling (i.e. a "zero-connected" CCA), see Gitter

I found workarounds for each of those, but it would be handy to have them anyways.

[imagejan]

• Single pixel labeling

I implemented this as an IJ2 Command here: PixelLabeler.java
Feel free to port it if you like, then I don't need to install my jar files manually in each KNIME installation where I need it.

[imagejan]

• Flip images on a given axis (the current Flip horizontally fails with 1D images and ignores two pixel rows on 2D images)

See imagej/imagej-plugins-commands#2, thanks @tibuch!

[tibuch]

I created two wrapped meta nodes which fixes the two pixel row ignore bug. The 1D case is not working with the wrapped meta nodes.

Just copy the nodes out of this workflow:
Flip_Horizontally_Vertically_TempFix.zip

[imagejan]

Thanks @tibuch!
Here's how I had worked around it for 1D (x=n, y=1) images in November last year:

• Resize Y by 2
• Rotate by 180 degree
• Max project Y
• Dimension extend Y to be able to view it in Image Viewer ;-)