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opencv

4 indexed repositories · View on GitHub

opencv
Open Source Computer Vision Library

C++ · 90890 stars
opencv_contrib
Repository for OpenCV's extra modules

C++ · 10199 stars
opencv-python
Automated CI toolchain to produce precompiled opencv-python, opencv-python-headless, opencv-contrib-python and opencv-contrib-python-head...

Python · 5398 stars
ci-gha-workflow
GitHub Actions workflows for OpenCV project

Python · 24 stars

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Why is the operation S0 >> 4 performed when the resize function takes u8 input and a scalar for the V-direction? Since int32 would not overflow in the scalar case, why is this operation still necessary? Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

opencv/opencv#29990 · 1 comment · Opened Sep 19, 2026
resize: INTER_LINEAR gives different results on OpenCL vs CPU-with-HAL when dsize is derived from fx/fy Open

bug category: imgproc

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opencv/opencv#29985 · 1 comment · Opened Sep 18, 2026
5.x: convertTo() drops saturation for CV_64U/CV_64S/CV_32U sources once the array reaches the vector width Open

bug category: core priority: high

Difficulty 4/5 3-5 days Newbie friendliness 64/100

opencv/opencv#29964 · 3 comments · Opened Sep 16, 2026
Python cv2.calcBackProject fails for 3D RGB histogram, ignores the 3rd channel(OpenCV 5.0.0) Open

bug category: imgproc

Difficulty 3/5 1-2 days Newbie friendliness 65/100

opencv/opencv#29938 · Opened Sep 13, 2026
[RFC] Plan-V4D — a type-safe dataflow eDSL and graphics runtime as an OpenCV extra module Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

opencv/opencv#29935 · 2 comments · Opened Sep 12, 2026
cudaarithm: cuda::multiply / sqr compute the 16U product in int and do not saturate (65535*65535 = 0); a 32S product with dtype=CV_32F is wrapped too Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

opencv/opencv_contrib#4213 · Opened Sep 8, 2026
cudaarithm: cuda::abs does not saturate the most negative 8S/16S/32S value (abs(-128) = -128), and cuda::norm(NORM_INF) can return 0 or a negative value for such inputs Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

opencv/opencv_contrib#4212 · Opened Sep 8, 2026
cudaarithm: bitwise_and/or/xor/not on a GpuMat ROI whose data pointer is not 4-byte (2-byte) aligned fail with a sticky "misaligned address" CUDA error Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

opencv/opencv_contrib#4211 · Opened Sep 8, 2026
cudaimgproc: calcHist / histEven / equalizeHist on a GpuMat ROI with x offset > 4 count pixels outside the ROI (the offsetX handling from #3475 only works for offsets 0..4) Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

opencv/opencv_contrib#4210 · Opened Sep 8, 2026
cudaimgproc: cuda::demosaicing (and cuda::cvtColor with Bayer codes) on a GpuMat ROI whose x offset is not a multiple of 4 (8U) / 2 (16U) pixels fails with a sticky "misaligned address" CUDA error Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

opencv/opencv_contrib#4209 · Opened Sep 8, 2026
5.x: cv::multiply / cv::pow on 16U give 0 instead of the saturated 65535 for short arrays and for the tail of in-place calls; #28557 is back and its regression test is DISABLED_ Open

bug category: core priority: high test

opencv/opencv#29893 · 1 comment · 1 assignee · Opened Sep 8, 2026
OpenCV 5.x build is broken with -DOPENCV_FORCE_3RDPARTY_BUILD=ON option on Linux Open

bug category: build/install

Difficulty 3/5 1-2 days Newbie friendliness 55/100

opencv/opencv#29888 · 1 comment · Opened Sep 7, 2026
dnn: vendored MLAS cannot be built on Windows/x86 — CMakeLists assumes a GCC driver (OpenCV 5.0.0) Open

bug category: 3rdparty category: build/install platform: win32

Difficulty 3/5 1-2 days Newbie friendliness 70/100

opencv/opencv#29885 · Opened Sep 7, 2026
Minor change to the documentation of cv.add() in Python Tutorial Open

bug category: python bindings

Difficulty 1/5 1-3 hours Newbie friendliness 90/100

opencv/opencv#29870 · 7 comments · Opened Sep 4, 2026
Feature Request: General λ-connected (lambda-connected) segmentation Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

opencv/opencv#29869 · 2 comments · Opened Sep 4, 2026
Feature Request: General λ-connected (lambda-connected) segmentation (beyond flood_fill()) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

opencv/opencv-python#1273 · 1 comment · Opened Sep 3, 2026
connectedComponents / connectedComponentsWithStats segfault on zero-size input instead of raising Open

category: imgproc category: python bindings

opencv/opencv#29854 · 2 comments · 1 assignee · Opened Sep 2, 2026
FFMPEG v8.1.1 vulnerabilities Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opencv/opencv-python#1272 · 1 comment · Opened Sep 2, 2026
EdgeDrawing::ValidateCircles() reads an uninitialised ellipse point for odd perimeters Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

opencv/opencv_contrib#4207 · Opened Sep 2, 2026
EdgeDrawing::detectEllipses() modifies the caller's input image when Params::Sigma < 1.0 Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

opencv/opencv_contrib#4203 · Opened Sep 2, 2026
phaseCorrelateIterative can return `(-N/2, -N/2)` for valid float32 inputs Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

opencv/opencv#29849 · Opened Sep 2, 2026
Feature Request: General λ-connected (lambda-connected) segmentation (beyond flood()) Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

opencv/opencv#29845 · 2 comments · Opened Sep 1, 2026
dnn: build fails with `Error: unsupported instruction 'vpdpbusd'` on GCC 11 + binutils < 2.36 (AVX-VNNI gate ignores assembler) Open

bug category: build/install category: dnn

opencv/opencv#29840 · 1 comment · 1 assignee · Opened Sep 1, 2026
cv2 import appends a trailing ":" to LD_LIBRARY_PATH — empty entry resolves to CWD and breaks child processes Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

opencv/opencv-python#1268 · 1 comment · Opened Aug 31, 2026
findTransformECCMultiScale ignores sampleMask with INTER_LINEAR 🤖🤖🤖 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

opencv/opencv#29821 · Opened Aug 28, 2026
Make harfbuzz optional in imgproc Open

category: imgproc feature

opencv/opencv#29819 · 18 comments · 1 assignee · Opened Aug 28, 2026
OpenCV.Js link is broken Open

category: documentation

Difficulty 1/5 Under an hour Newbie friendliness 84/100

opencv/opencv#29818 · 1 comment · Opened Aug 28, 2026
Packaging documentation: source and notice mapping for six bundled libraries in 4.11.0.86 Linux contrib wheel Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opencv/opencv-python#1267 · Opened Aug 28, 2026
Provide PEP 770 SBOM files in generated wheels Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

opencv/opencv-python#1266 · Opened Aug 28, 2026
warpPerspective with BORDER_REPLICATE is not accurate on ARM with KleidiCV Open

bug category: 3rdparty category: imgproc platform: arm

Difficulty 4/5 3-5 days Newbie friendliness 52/100

opencv/opencv#29816 · 4 comments · Opened Aug 28, 2026
cv::dilate asserts on input mask of type CV_Bool Open

category: imgproc feature

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

opencv/opencv#29798 · Opened Aug 25, 2026
resize(): SIGSEGV for CV_8UC3 with INTER_LINEAR on arm64 macOS at scale factors just below 1.0 (works in 4.12, crashes in 4.14 and 5.0) Open

bug category: 3rdparty category: imgproc platform: android platform: arm platform: ios/osx

opencv/opencv#29794 · 5 comments · 1 reaction · 1 assignee · Opened Aug 25, 2026
findTransformECCMultiScale systematically under-estimates scale (same root cause as #29774) 🤖🤖🤖 Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

opencv/opencv#29781 · Opened Aug 23, 2026
test_ecc: the accuracy criterion averages warp-matrix entries of different units, so it cannot detect accuracy regressions 🤖🤖🤖 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

opencv/opencv#29776 · Opened Aug 22, 2026
findTransformECC systematically under-estimates scale (affine/homography) 🤖🤖🤖 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

opencv/opencv#29774 · 1 comment · Opened Aug 22, 2026
cv2.applyColorMap got different result shape between 4.x and 5.x Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

opencv/opencv-python#1263 · 3 comments · Opened Aug 21, 2026
optflow: calcOpticalFlowSparseToDense segfaults when k exceeds the number of sparse matches Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

opencv/opencv_contrib#4195 · 3 comments · Opened Aug 21, 2026
希望支持中文路径 Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 55/100

opencv/opencv#29769 · Opened Aug 21, 2026
Add a 3D remap primitive for volumetric data 🤖🤖🤖 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

opencv/opencv#29768 · 1 comment · Opened Aug 21, 2026
image watch Open

question (invalid tracker)

Difficulty 5/5 Over a week Newbie friendliness 25/100

opencv/opencv#29733 · 1 comment · Opened Aug 18, 2026
VideoCapture reports a frame count it cannot deliver when the decoder fails on first read Open

category: 3rdparty category: videoio

Difficulty 4/5 3-5 days Newbie friendliness 45/100

opencv/opencv#29722 · 2 comments · Opened Aug 15, 2026
Feature request: n-dimensional marker-controlled watershed 🤖🤖🤖 Open

category: 3d module category: imgproc feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

opencv/opencv#29721 · Opened Aug 14, 2026
wechat_qrcode no longer accepts Caffe models as arguments in OpenCV >= 5.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

opencv/opencv#29712 · 3 comments · Opened Aug 13, 2026
CI: PR-5.x workflow fails for all PRs - references deleted geometry_module branch Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

opencv/opencv_contrib#4191 · Opened Aug 13, 2026
compareHist(HISTCMP_CORREL) returns -1.0 for self-comparison due to catastrophic cancellation Open

bug category: imgproc

Difficulty 3/5 1-2 days Newbie friendliness 72/100

opencv/opencv#29706 · 1 comment · 1 reaction · Opened Aug 13, 2026
Breaking changes in mcc modules API not documented in OpenCV 5.0 migration guide Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

opencv/opencv#29705 · 2 comments · Opened Aug 13, 2026
Face Landmark Detector with LBF fails on 5.0.0 but works on 4.14.0 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

opencv/opencv#29703 · 1 comment · Opened Aug 12, 2026
macOS ARM64 wheel 5.0.0.93 bundles GPL-configured FFmpeg (libx264/libx265) — conflicts with README LGPLv2.1 statement Open

bug

opencv/opencv-python#1260 · 2 comments · 1 assignee · Opened Aug 12, 2026
Proposal: CUDA-accelerated implementation of TrackerCSRT Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

opencv/opencv_contrib#4189 · Opened Aug 11, 2026
cv2.fisheye.calibrate() fails with (N, 1, C) point arrays in OpenCV 5.0.0 Open

bug category: calib3d

Difficulty 4/5 3-5 days Newbie friendliness 55/100

opencv/opencv#29692 · 4 comments · Opened Aug 11, 2026

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