* Auto-Blend Stack Images: a depth map by depth from focus, for Lens Blur
`edit.autoBlendLayers` with `method: stack` and `depthMap: true` adds a hidden gray Depth layer, the layer each pixel is sharpest in (black = the bottom layer, white = the top), from `photocraft_algo::dff`: the ring difference filter as focus measure, guided-filter aggregation with the merged picture as guide, a streaming peak search with Gaussian interpolation and a confidence, edge-aware weighted least squares solved by multigrid-preconditioned conjugate gradients, and guided upsampling. Once on a layer mask it drives Lens Blur's depth map.
Closes#2067.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
* Depth from focus: a guide or plane of the wrong length is the empty map
Review follow-up on #2073: `depth_from_focus` is public and indexed
`guide[i]` without checking that `guide` and every `luma` plane are
`w × h` long. It now returns the empty map (depth 0, confidence 0) for a
mismatch, before anything is read, and the test covers a short guide, a
short plane and a size that matches neither.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
---------
Co-authored-by: Claude Fable 5.1 <[email protected]>
* Auto-Align Layers: register focus and exposure brackets by intensity when there is nothing to match
Feature matching fails outright on layers that nearly coincide (a focus bracket: sub-pixel shifts, up to a few percent of scale from focus breathing, much of every frame defocused). `photocraft_algo::direct` registers the target to the reference coarse-to-fine on a Gaussian pyramid of the luminance, the cost the mean-removed RMS of the warped difference over the pixels both cover, by a bounded Nelder-Mead search with a per-level schedule; the pose is a similarity about the centre, affine or projective per the projection, and resolution independent, so the search stops short of full resolution. `edit.autoAlignLayers` gets `registration`: auto (features, then intensity when nothing matches), features, intensity; layers register outward from the reference, each to the previous one aligned.
Closes#2064.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
* Intensity registration: reject a no-fit, search on coarsened planes
Review follow-up on #2065:
- `direct::cost` also returns the correlation of the reference with the
warped target over the overlap; `Registration.correlation` carries it.
Unlike the mean-removed RMS it is exposure independent, so it tells a
bracket (near 1) from unrelated pictures (near 0).
- `register_direct` fails with the existing "couldn't find enough matching
detail" error when a layer's best pose overlaps its neighbour by less than
a quarter of the plane or correlates below 0.5, instead of placing it at
whatever pose the search box ended at.
- The luminance planes are built at the search scale (`luma_alpha` with the
reduction factor, ≤ 2048 px across) and the warp of each registered layer
runs there too; the pose is resolution independent and its matrix at full
resolution places the layer. Nothing full-resolution is held.
- The reference index is checked once with `get`; no unclamped indexing.
- Tests: correlation at an exposure step, for unrelated textures and a flat
plane; the engine rejects unrelated layers and a mostly empty one.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
* Auto-Blend Stack Images: fuse the merged layer per pyramid level by region energy, with halo control
The merged layer of Edit › Auto-Blend Layers › Stack Images was the per-pixel masks blended with a multiresolution spline, so a wrong pick in the mask reached every scale. `pyramid::fuse_stack` fuses the layers on the Laplacian pyramid instead: per coefficient the layer with the largest region energy of its luminance band wins (Adelson et al. 1984's multifocus composite with Wang & Chang 2011's rules), the residual follows local deviation + entropy, and with halo control the levels coarser than the guide are weighed by the guide's energy so a bright object's defocused glow stays out. `haloControl` (0..8, default 2) on `edit.autoBlendLayers`; the masks and the panorama method are unchanged.
Closes#2043.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
---------
Co-authored-by: Claude Fable 5.1 <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>
* Auto-Align Layers: register focus and exposure brackets by intensity when there is nothing to match
Feature matching fails outright on layers that nearly coincide (a focus bracket: sub-pixel shifts, up to a few percent of scale from focus breathing, much of every frame defocused). `photocraft_algo::direct` registers the target to the reference coarse-to-fine on a Gaussian pyramid of the luminance, the cost the mean-removed RMS of the warped difference over the pixels both cover, by a bounded Nelder-Mead search with a per-level schedule; the pose is a similarity about the centre, affine or projective per the projection, and resolution independent, so the search stops short of full resolution. `edit.autoAlignLayers` gets `registration`: auto (features, then intensity when nothing matches), features, intensity; layers register outward from the reference, each to the previous one aligned.
Closes#2064.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
* Intensity registration: reject a no-fit, search on coarsened planes
Review follow-up on #2065:
- `direct::cost` also returns the correlation of the reference with the
warped target over the overlap; `Registration.correlation` carries it.
Unlike the mean-removed RMS it is exposure independent, so it tells a
bracket (near 1) from unrelated pictures (near 0).
- `register_direct` fails with the existing "couldn't find enough matching
detail" error when a layer's best pose overlaps its neighbour by less than
a quarter of the plane or correlates below 0.5, instead of placing it at
whatever pose the search box ended at.
- The luminance planes are built at the search scale (`luma_alpha` with the
reduction factor, ≤ 2048 px across) and the warp of each registered layer
runs there too; the pose is resolution independent and its matrix at full
resolution places the layer. Nothing full-resolution is held.
- The reference index is checked once with `get`; no unclamped indexing.
- Tests: correlation at an exposure step, for unrelated textures and a flat
plane; the engine rejects unrelated layers and a mostly empty one.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
---------
Co-authored-by: Claude Fable 5.1 <[email protected]>
The capability matrix and the "Lossy WebP" note still said there was no
pure-Rust lossy encoder and that webp_lossless: false was refused. The
VP8 key-frame encoder landed in #880, and the book already documents it;
say the same here: lossless by default, lossy with webp_lossless off and
webp_quality, alpha in ALPH, metadata in VP8X chunks, 16383 px per side.
Co-authored-by: Claude Fable 5.1 <[email protected]>
