Add reader initialization support for Data Matrix and PDF417 (#2069)

2026-04-30T23:28:58+00:00

Add Code 128 reader initialization support (#2068)

2026-04-30T21:56:28+00:00

Add Aztec reader initialization support (#2066)

2026-04-30T20:57:43+00:00

Fix QR decode failure for small/native-size images (#2061)

2026-04-08T03:40:49+00:00

* Fix QR decode failure for small/native-size images (#1976) QRCodeWriter.encode(..., 0, 0) produces a 33x33 native-size QR that ZXing cannot decode. The CENTER_QUORUM filter in selectBestPatterns() (added in 110ef9e to fix #1567) removes finder patterns with count < 2. For small images, the row-skip interval (iSkip=3, MIN_SKIP) means the scanner only crosses the top two finder pattern centers on a single row each, giving them count=1. The bottom-left pattern gets count=2 because it's scanned after iSkip drops to 2. The filter then removes the two count=1 patterns, leaving 1 of the 3 needed, and throws NotFoundException. The fix: only apply the CENTER_QUORUM filter when either (a) at least 3 confirmed patterns would survive, or (b) the total candidate list exceeds a size threshold. This preserves #1567 protection while allowing small images through. Why a size threshold: the filter was added to prevent O(n^3) blowup in the triangle-selection loop when noisy images produce thousands of spurious candidates. When the candidate list is small (<= 25 entries, yielding <= ~2300 loop iterations), the cubic cost is negligible regardless of whether the patterns are real or spurious. A clean single-QR image produces ~3 candidates; even a noisy image below the threshold is computationally trivial. Above the threshold, the filter applies unconditionally, matching today's behavior. Alternatives considered: - Removing the filter entirely: all 561 existing tests pass, but re-opens #1567 for pathological images with thousands of spurious count=1 candidates. - Reducing MIN_SKIP from 3 to 1 for small images: addresses the symptom (more scan rows = higher counts) but doesn't fix the fundamental interaction between iSkip and the quorum filter, and changes scan behavior for all small images. - Fallback (try with filter, retry without on failure): re-opens #1567 whenever fewer than 3 confirmed patterns exist, which is exactly the scenario that produces thousands of unconfirmed candidates in noisy images. * Increase noisy-image test timeout from 5s to 30s GitHub shared runners timed out at 5s. Local measurement shows ~1.2s, implying at least 4x slowdown on CI. 30s gives a comfortable margin while still catching the O(n^3) regression from #1567.

Loosen ITF max variance for 3x module widths (#2014)

2025-11-11T13:27:13+00:00

Avoid decoding stacked row 1 of N independently (#1693)

2023-09-16T13:15:21+00:00

* Avoid decoding stacked row 1 of N independently * Avoid decoding stacked row 1 of N independently

Avoid 2 more RSS Expanded finder pattern false positive scenarios (#1692)

2023-09-15T15:55:54+00:00

Detect RSS Expanded finder pattern false positives by checking sequences (#1680)

2023-09-03T21:16:39+00:00

Fix MaxiCode handling of vertical quiet zone (#1671)

2023-07-30T17:58:44+00:00

Add ResultMetadataType.ERRORS_CORRECTED and ERASURES_CORRECTED (#1657)

2023-06-25T22:30:21+00:00

* Add ResultMetadataType.ERRORS_CORRECTED and ERASURES_CORRECTED (2D barcodes) * Maintain existing constructor on AztecDetectorResult * Maintain existing ReedSolomonDecoder.decode method

ZXing/zxing.git/core/src/test/resources, branch master