opencv/opencv_contrib

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Repository for OpenCV's extra modules

Stars: 10.2k
Forks: 5.9k
Open beginner issues: 5
Indexed issues: 579
Avg merge: 1d 23h
Merged PRs (30d): 1

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

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579 open issues indexed

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
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
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
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
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
Incorrect documentation for WeChatQRCode module Open

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

opencv/opencv_contrib#4186 · Opened Aug 3, 2026
Add detector-agnostic ANMS keypoint redistribution utility to opencv_contrib (xfeatures2d) Open

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

opencv/opencv_contrib#4185 · Opened Aug 2, 2026
xfeatures2d: matchLOGOS crashes with out-of-bounds iterator access when fewer than N candidate points exist Open

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

opencv/opencv_contrib#4174 · 1 comment · Opened Jul 11, 2026
Proposal: High-Throughput SIMD Edge Detection Module (ximgproc)⁠ Open

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

opencv/opencv_contrib#4162 · 2 reactions · Opened Jun 26, 2026
CUDA SeparableLinearFilter might fail because of too large grid dimensions Open

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

opencv/opencv_contrib#4153 · 4 comments · Opened Jun 19, 2026
[feature] Add fast geodesic binary/gray-scale morphology operations Open

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

opencv/opencv_contrib#4149 · Opened Jun 17, 2026
[Bug] Blocking waitForCompletion call in stereosgm.cu Open

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

opencv/opencv_contrib#4145 · Opened Jun 9, 2026
Julia bindings fail to build after `RotatedRect` became a wrapped type Open

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

opencv/opencv_contrib#4142 · Opened Jun 7, 2026
[feature] Chan Vese Segmentation algorithm Open

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

opencv/opencv_contrib#4141 · 2 comments · Opened Jun 5, 2026
Cannot build opencv_contrib with CUDA Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

opencv/opencv_contrib#4120 · 4 comments · Opened May 13, 2026
StereoSGM assert bug on large images with large disparity Open

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

opencv/opencv_contrib#4112 · Opened Apr 21, 2026
opencv_img_hash prevent from building App Store dynamic framework Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

opencv/opencv_contrib#4110 · Opened Apr 16, 2026
[aruco] Restore write access to objPoints and ids(or provide setters) for custom 3D reconstruction, curved markers, and projection-based calibration Open

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

opencv/opencv_contrib#4087 · 2 comments · Opened Feb 26, 2026
cuda module warnings Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

opencv/opencv_contrib#4082 · 1 comment · Opened Feb 18, 2026
[feature] CV_16F support in HDF5 Open

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

opencv/opencv_contrib#4075 · 1 comment · Opened Feb 6, 2026
WeChatQR detection causes the program to crash Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

opencv/opencv_contrib#4058 · 3 comments · Opened Dec 26, 2025
New optional parameter for cv::cuda::gemm Open

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

opencv/opencv_contrib#4056 · Opened Dec 24, 2025
Build error in bgsegm::BackgroundSubtractors Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

opencv/opencv_contrib#4030 · 2 comments · Opened Oct 25, 2025
cv::cuda::demosaicing interprets color code differently to cv::cuda::cvtColor Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

opencv/opencv_contrib#4024 · Opened Oct 15, 2025
TrackerCSRT not included in the wasm bundle Open

category: build/install js bindings

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

opencv/opencv_contrib#4021 · 2 comments · Opened Oct 12, 2025
Incorrect types 16S for ximgproc::DisparityFilter in documentation Open

category: documentation category: ximgproc

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

opencv/opencv_contrib#4003 · 7 comments · Opened Sep 23, 2025
createGaussianFilter and createSeparableLinearFilter do not support ksize > 32 Open

category: cuda feature

Difficulty 5/5 Over a week Newbie friendliness 32/100

opencv/opencv_contrib#3997 · 6 comments · Opened Sep 2, 2025
cv.ppf_match_3d_PPF3DDetector.trainModel() fails with valid float32 input in Python bindings Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

opencv/opencv_contrib#3981 · Opened Jul 30, 2025
[Feature Suggestion] cv2::stream, a live stream module for real time media feed Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

opencv/opencv_contrib#3977 · 4 comments · 10 reactions · Opened Jul 25, 2025
FastCV_Extension/WarpPerspective.accuracy test fails with BORDER_TRANSPARENT Open

category: fastcv

Difficulty 3/5 1-2 days Newbie friendliness 40/100

opencv/opencv_contrib#3959 · Opened Jun 17, 2025
FastCV_Extension/TrackingTest.accuracy test fails in 5.x Open

category: fastcv

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

opencv/opencv_contrib#3958 · Opened Jun 17, 2025
FastCV_Extension/MSERTest.accuracy crashes with sigsegv in 5.x Open

category: fastcv

Difficulty 3/5 1-2 days Newbie friendliness 35/100

opencv/opencv_contrib#3957 · Opened Jun 17, 2025
fast_line_detector do not merge segments oriented in the opposite direction Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

opencv/opencv_contrib#3956 · Opened Jun 16, 2025
Subpixel cuda StereoSGM Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

opencv/opencv_contrib#3955 · Opened Jun 16, 2025
Add k3 support for onmidir Open

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

opencv/opencv_contrib#3952 · Opened Jun 11, 2025
Julia bindings have createCLAHE but not apply Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

opencv/opencv_contrib#3950 · Opened Jun 11, 2025
How can I cross compile OpenCV with freetype ? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

opencv/opencv_contrib#3948 · 1 comment · Opened Jun 5, 2025
Move from glog to ng-log Open

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

opencv/opencv_contrib#3946 · Opened May 24, 2025
QR code scanning error - using wechat_qrcode module Open

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

opencv/opencv_contrib#3941 · Opened May 22, 2025
modules/img_hash/src/marr_hildreth_hash.cpp: error in kernel computation ? Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

opencv/opencv_contrib#3940 · 3 comments · Opened May 21, 2025
about how to use cv2:: codacodec:: VdieoReader::set() Open

category: cuda question (invalid tracker)

Difficulty 5/5 Over a week Newbie friendliness 20/100

opencv/opencv_contrib#3944 · 6 comments · Opened May 21, 2025
Segmentation Fault in ArUco Detection on Raspberry Pi (ARM) with OpenCV 4.6.0 Open

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

opencv/opencv_contrib#3938 · Opened May 19, 2025
MCC module: Add support for Datacolor SpyderCheckr Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

opencv/opencv_contrib#3935 · Opened May 14, 2025
[BUG] [tracking] Tracking/DistanceAndOverlap.MedianFlow/1 fails on Windows on ARM64 Open

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

opencv/opencv_contrib#3933 · Opened May 12, 2025
GSOC: Adding computational photography algorithms for better image quality Open

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

opencv/opencv_contrib#3921 · Opened Apr 8, 2025

opencv/opencv_contrib

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