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Task #12059 (new)

Opened 6 years ago

Last modified 4 years ago

C++ Image rescaling/resampling

Reported by: rleigh Owned by: rleigh
Priority: minor Milestone: Unscheduled
Component: Bio-Formats Version: 5.0.0
Keywords: cpp Cc:
Resources: n.a. Referenced By: n.a.
References: n.a. Remaining Time: n.a.
Sprint: n.a.

Description

In order to implement FormatReader::openThumbBytes, a solution is needed to downscale/downsample the image. The java implementation uses java.awt.image.BufferedImage? which is obviously not an option in C++.

Options include:

  • OpenGL (render to offscreen framebuffer object at desired scale, with mipmaps handling smooth resampling)
  • OpenCL (as for GL, but do it by hand with GPU and CPU variants)
  • Hand-rolled bilinear filtering for each supported pixel type (can be templated).
  • [future for NDIM: trilinear filter to give a 3D thumbnail]

The by hand bilinear filter would be the most flexible (but slow) solution.

A more fundamental question here is whether thumbnail generation really belongs in the base reader API? It might be better as a higher-level function/class which takes a reader/series and gives you a thumbnail.

Change History (4)

comment:1 Changed 6 years ago by rleigh

  • Keywords cpp added

comment:2 Changed 5 years ago by rleigh

  • Milestone changed from 5.1.0 to 5.1.2

comment:3 Changed 4 years ago by jamoore

  • Milestone changed from 5.1.4 to B-F-5.1.4

Splitting 5.1.4 due to milestone decoupling

comment:4 Changed 4 years ago by sbesson

  • Milestone changed from B-F-5.2.0 to Unscheduled
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