JuliaImages / JuliaImages/ImageFiltering.jl
Linear extrapolation for boundary values?
Nobody has claimed this yet.
- Dominant language
- Julia
- Stars
- 104
- Forks
- 52
- PR merge metrics
- No merged PRs in 30d
Description
The image padding machinery doesn't allow for extrapolation. This causes significant errors in the calculation of the derivative at the border, as noted in the documentation:
Ignore the values at the border since we expect them to be erroneous.
I took a look at the source to see whether I could bang out a fix in an hour, but was stymied by how heavily the current padding framework relies on indexing. Any suggestions on how one would implement this boundary condition?
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the imgradients documentation and the current image padding framework, especially how indexing handles boundary values. Determine how a linear extrapolation boundary condition should interact with derivative calculation, then verify that border derivatives no longer require ignoring the boundary.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- computer-vision
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100