vx_table_lookup — VX pixel op

• Data kinds: image2d × signal → image2d

• Call: import fullseye as fs; fs.ledger.vx_table_lookup(image, table, *, offset=0) (to call the implementation directly, import vxcore; vxcore.vx_table_lookup(image, table, *, offset=0); from the registry, opsvx.get("vx_table_lookup"))

Usage

Table lookup (Section 3.47): output = table[pixel value + offset] (REQ-0421). Accepts U8 and S16 (REQ-0422). The output dtype is the table's dtype.

*offset*: an S16 table puts 0 in the middle so that negative pixel values can be looked up (VX_LUT_OFFSET, typically 32768). 0 for U8. ★ If any pixel looks up outside the table, it stops (it does not silently clamp to the edge).

Raises ValueError: the image is not a 2-D U8/S16 / the table is not 1-D, or empty / some pixel looks up outside the table.

Detailed usage guide

• openvx_ports family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• (none yet)

Ops the type connects to (they accept image2d as input)

vx_sobel3x3 · vx_magnitude · vx_phase · vx_histogram · vx_nonmax_suppression · vx_warp_affine · vx_warp_perspective · vx_remap

Same category (pixel)

vx_histogram

*Provenance: vxcore.py — VX operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.