Redesign the codebase

[johnnychen94]

• fixes #7

We don't need to create another Image* metric to implement the codes, multiple dispatches on AbstractArray{<:AbstractArray} is sufficient.

• fixes #13

The current colwise function doesn't take much advantage of existing codes from Distances.jl, so I almost rewrite it following the same pattern in Distances.jl

TODO:

• [x] colwise
  • [x] Vecotr{IMG}-Vector{IMG}
  • [x] Matrix{IMG}-Matrix{IMG}
• [x] common metrics from Distances.jl
• [x] pairwise (partially finished)
• [x] Hausdorff and ModifiedHausdorff
• [x] CIEDE2000

Won't do in this PR:

• RGB support
• weighted metrics from Distances.jl
• acceleration by calling _pairwise! from pairwise!
• cross-type support of colwise and pairwise
• broadcast in colwise and pairwise
• use view in colwise! and pairwise!

[codecov[bot]]

Codecov Report

Merging #14 into master will decrease coverage by 69.93%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           master      #14       +/-   ##
===========================================
- Coverage   97.46%   27.53%   -69.94%     
===========================================
  Files           4        4               
  Lines          79       69       -10     
===========================================
- Hits           77       19       -58     
- Misses          2       50       +48

Impacted Files	Coverage Δ
src/ImageDistances.jl	100% <ø> (ø)	:arrow_up:
src/generic.jl	100% <100%> (+4.34%)	:arrow_up:
src/hausdorff.jl	0% <0%> (-100%)	:arrow_down:
src/ciede2000.jl	0% <0%> (-75%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e6bb1cf...7584cbd. Read the comment docs.

[codecov[bot]]

Codecov Report

Merging #14 into master will decrease coverage by 32.13%. The diff coverage is 79.62%.

@@             Coverage Diff             @@
##           master      #14       +/-   ##
===========================================
- Coverage    97.4%   65.26%   -32.14%     
===========================================
  Files           4        5        +1     
  Lines          77       95       +18     
===========================================
- Hits           75       62       -13     
- Misses          2       33       +31

Impacted Files	Coverage Δ
src/metrics.jl	100% <100%> (ø)
src/ImageDistances.jl	50% <33.33%> (-50%)	:arrow_down:
src/ciede2000.jl	71.42% <50%> (-3.58%)	:arrow_down:
src/hausdorff.jl	37.2% <64.28%> (-62.8%)	:arrow_down:
src/generic.jl	94.73% <93.33%> (-0.92%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 487fc44...98280aa. Read the comment docs.

[johnnychen94]

@juliohm There's only one last TODO(CIEDE2000) for this PR to be ready, do you have time to have a look at recently? I believe a large part of the code is justified by the test cases.

[johnnychen94]

I'd like to merge this PR ASAP so that I can do other enhancements based on this PR. @juliohm