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A 4x3 dense matrix where values run down each column rather than across each row, which is the Matrix Market array convention and the opposite of what most readers assume. Getting it wrong rearranges every element rather than raising an error.
A matrix whose banner declares an integer field, so the values are integers and must not be widened to floats on the way in. The stored range deliberately reaches the signed 16-bit limits, so a narrow integer type overflows visibly.
An 8x8 sparse matrix in Matrix Market coordinate form with twelve stored entries and 1-based indices, the convention that catches every reader written against 0-based arrays. Comment lines beginning with a percent sign appear before the size line, where the format requires them.
A symmetric pattern matrix carrying only positions and only the lower triangle, so nine stored lines describe sixteen non-zeros. Both halves of that (no value column and an implied mirror) are places a reader can silently disagree with the file.
A valid Matrix Market file describing a 6x6 matrix with no stored entries, which is an all-zero matrix rather than an error. It separates readers that model an empty result from readers that treat a missing entry block as truncation.
The one-member server-delegation document that lets example.com host its Matrix homeserver at matrix.example.com:8448 without changing user IDs. For testing federation discovery and explicit-port handling.
The exact per-frame alpha used to composite every clip in this group, as an 8-bit greyscale clip: white is opaque subject, black is background, and edges carry genuine intermediate values because the matte is anti-aliased rather than binary. This is what makes matting output measurable. Compare a predicted alpha against this frame by frame instead of inspecting a composite and forming an opinion.
The same subject and the same alpha, composited over busy patterned: no chroma screen, which is the case a general background-removal model actually has to handle. Score the predicted alpha against the ground-truth matte in this group.
The canonical keying setup: the subject over a chroma-green field carrying a deliberate vertical lighting falloff, because a perfectly flat key is unrealistically easy. Pull a key, then score the resulting alpha against the ground-truth matte in this group.
The same subject and the same alpha, composited over colour close to subject: no chroma screen, which is the case a general background-removal model actually has to handle. The background colour deliberately sits close to the subject's own, so colour alone cannot separate them and the model must use shape and motion. Score the predicted alpha against the ground-truth matte in this group.
The same subject and the same alpha, composited over dark studio: no chroma screen, which is the case a general background-removal model actually has to handle. Score the predicted alpha against the ground-truth matte in this group.
The same subject and the same alpha, composited over office interior: no chroma screen, which is the case a general background-removal model actually has to handle. Score the predicted alpha against the ground-truth matte in this group.
The same subject and the same alpha, composited over outdoor daylight: no chroma screen, which is the case a general background-removal model actually has to handle. Score the predicted alpha against the ground-truth matte in this group.
Clean RGB composite of the fine-fringe soft-alpha subject on a neutral grey, paired input for matte extractors.
Soft-alpha cut-out (hair edges: fine-fringe) for alpha-matting / background-removal quality tests.
Clean RGB composite of the fur-edge soft-alpha subject on a neutral grey, paired input for matte extractors.
Soft-alpha cut-out (hair edges: fur-edge) for alpha-matting / background-removal quality tests.
Clean RGB composite of the glass-rim soft-alpha subject on a neutral grey, paired input for matte extractors.
Soft-alpha cut-out (soft edges: glass-rim) for alpha-matting / background-removal quality tests.
Clean RGB composite of the hair-strands soft-alpha subject on a neutral grey, paired input for matte extractors.
Soft-alpha cut-out (hair edges: hair-strands) for alpha-matting / background-removal quality tests.
Clean RGB composite of the plant-edge soft-alpha subject on a neutral grey, paired input for matte extractors.
Soft-alpha cut-out (soft edges: plant-edge) for alpha-matting / background-removal quality tests.
Clean RGB composite of the soft-edge-blob soft-alpha subject on a neutral grey, paired input for matte extractors.
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