I am wondering if its possible to implement Imageprocessing tools in FME?
For instance: Lets say you have a LIDAR file and want to make presentable contours. You then take ur filltered LIDAR file, do some processing to it first, then you make contours, write the contourvector to a raster, and on the raster I would like to have to oportunity to do Image processing, with a convolution/kernel filter.
Can this be implemented i FME?
Best answer by kim
There's a possibility for small kernels: duplicating the raster onto different bands (say 8 times) and moving them all by 1 cell will allow you to make a fake 3x3 kernel, using a rasterexpressionevaluator and using different bands instead of different neighbours for the calculations. This gets cumbersome (and slow) fast.
I tried accessing the raster data from the python API to use it with a custom kernel processor, but I've not found a way to do this. Preferably you'd access the data as a 2D array, the rest is reasonably easy. If you do find a way, please let me know!
The ContourGenerator or the SurfaceModeller transformer can be used to generate contour from point cloud. And then, you can use the VectorOnRasterOverlayer to draw the contour onto a raster.
Try them.
Takashi
+17
You will have to introduce the image processing filter yourself, since no transformer exists for the job.
See the following page for some examples.
Itay
+5
There's a possibility for small kernels: duplicating the raster onto different bands (say 8 times) and moving them all by 1 cell will allow you to make a fake 3x3 kernel, using a rasterexpressionevaluator and using different bands instead of different neighbours for the calculations. This gets cumbersome (and slow) fast.
I tried accessing the raster data from the python API to use it with a custom kernel processor, but I've not found a way to do this. Preferably you'd access the data as a 2D array, the rest is reasonably easy. If you do find a way, please let me know!
Guess I have to output the raster then to the kernel filtering.
+8Hi, @paal, @kim, check this out! I tried to create a RasterConvoluter as an image processing tool on FME Hub. It only supports a single real*64 band type, however for starters sake... Anyway, FME has plenty of tools to translate any kind of raster to real*64 and back to colored images. Have fun with it.
+6Hi @paal @kim
I'm happy to report that we implemented support for raster lens processing in FME 2018.1 and 2019.0 with the new RasterConvolver transformer.
For more info see these articles:
https://blog.safe.com/2018/07/fme-and-convolution-evangelist176/
https://knowledge.safe.com/articles/74523/neighborhood-functions.html
https://knowledge.safe.com/articles/72616/edge-detection-with-the-rasterconvolver.html
https://knowledge.safe.com/articles/72505/raster-slope-calculations-as-a-rasterconvolver-exa.html
+8Hi @paal @kim
I'm happy to report that we implemented support for raster lens processing in FME 2018.1 and 2019.0 with the new RasterConvolver transformer.
For more info see these articles:
https://blog.safe.com/2018/07/fme-and-convolution-evangelist176/
https://knowledge.safe.com/articles/74523/neighborhood-functions.html
https://knowledge.safe.com/articles/72616/edge-detection-with-the-rasterconvolver.html
https://knowledge.safe.com/articles/72505/raster-slope-calculations-as-a-rasterconvolver-exa.html
Very happy (now find the time to play with it)!
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