augmentation op• Data kinds: image → image
• Call: fullseye.apply(img, "aug_jpeg_blocks", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
*The figure is the real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*
JPEG blocking / ringing artefacts. The image (scaled to 0..255) is cut into 8x8 blocks, each transformed with an orthonormal 2-D DCT-II (`scipy.fft.dctn), quantised with the STANDARD JPEG Annex-K luminance table scaled by (1 + 40*a)/16 (a=0 -> near-lossless, a=1 -> heavy quantisation), then reconstructed with the inverse DCT. b shifts the 8x8 block grid phase by int(7*b)` px in both axes, i.e. moves where the block seams fall. Images that are not a multiple of 8 are edge-replicate padded and cropped back to HxW (so 4x4 inputs are handled).
• gallery2d_color_artistic family guide
• 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.
The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.
aug_jpeg_blocks 0.50 0.50
▸ Load this pipeline · Load & run
• gallery2d_color_artistic — py -3.11 examples/gallery2d_color_artistic.py
• sim2real_and_alife — py -3.11 examples/sim2real_and_alife.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
augmentation)aug_shot_noise · aug_read_noise · aug_fixed_pattern · aug_motion_blur · aug_vignette · aug_chromatic · aug_rolling_shutter · aug_cutout
*Provenance: ops.py — 2D 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.