opencv

July, 2026

• Core module:

  • Fixed copyTo on empty fixed-type matrices #28371
  • Improved precision of RotatedRect::points #28381
  • Fixed UB in cv::error when breakOnError set to true #28446
  • Fixed cv::mul overflow for U16 type #28579
  • Revert "Disable IPP with AVX512 in cv::compare because of performance regression" #28587
  • Fixed UBSan function pointer type mismatch in countNonZero #28581
  • Fixed heap-buffer-overflow in YAML parseKey for empty keys #28620
  • Optimized flip Horizontal #28614
  • Added AVX VNNI support #28684
  • Fixed meanStdDev on Windows for ARM #28739
  • Added NEON implementation for rotate function #28609
  • Fixed inplace transpose race by enforcing LLSS ordering via local barrier in OpenCL #28686
  • Fixed incorrect results for in-place flip on strict OpenCL implementations #28813
  • Added platform-specific SIMD for cv::reduce REDUCE_SUM #28782
  • Implemented safe handling of compressed file level extension (.gz[0-9]) #28923
  • Extended AutoBuffer to mimic std::vector #28909 and use it more #28907
  • Fixed signed overflow UB in Point/Point3i::dot() #28959
  • Added SIMD intrinsics support for norm_mask function #28610
  • Add ARMPL support for DFT Function #28664
  • Implemented OpenCL kernel for UMat::diag to avoid aliasing races #28897
  • Optimized norm with RVV HAL #29057
  • Deprecateed MatCommaInitializer_ #29060
  • Fixed v_matmul/v_matmuladd scalable semantics and expand lane-group test coverage #29080
  • Siwtched to better Durand-Kerner initialization in solvePoly #29109
  • Fixed numerical instability and out-of-bounds store in VBLAS SIMD #29141
  • Added convertScale data type conversions to RVV HAL #29174
  • Fixed inverted continuity check in cvReshapeMatND() #29132
  • Fixed memory leak in OpenCL extensions gathering #28981
  • Added check to reject nd-matrix dim count above CV_MAX_DIM in FileStorage read #29301
  • Moved IPP math functions from core module to HAL #29306
  • parallelize sort_ using parallel_for_ #29192
  • Fixed potential stack overflow in FileStorage #29348
  • Vectorizeed meanStdDev #29339
  • FileStorage reads integers above INT_MAX into float/double without truncation #29368
  • Optimized minMaxIdx/minMaxLoc #29340
  • Added fast-path transposeND for identity and 2D transpose orders #29172
  • Migrateed MomentsInTile_SIMD to universal:scalable intrinsics #28881
  • Fixed Unicode temp path handling on Windows #28935
  • Vectorized cv::reduce #27510
  • Enabled ipp calls for sort and sortIdx #29477
  • Fixed use-after-scope when Mat::mul() is given a scalar #29447
  • Optimized countNonZero #29390
  • Enabled AVX-512 dispatch for sum #29400
  • SIMD optimizations for norm, distance and Hamming APIs #29335
  • Optimized gemm implementation with Universal SIMD #29242

• Imgproc module:

  • Added findTRUContours - lock-free parallel contour extraction #28773, #29167, #29461

  • Fixed race condition in GaussianBlur #28372

  • BilateralFilter optimization for AVX512 #28401

  • MedianBlur improvement with AVX512 #28394

  • Fixed integer overflow in medianBlur #28386

  • Fixed Laplacian kernel precision for double inputs #28489

  • Fixed minEnclosingCircle O(n^3) worst case by adding Welzl shuffle #28548

  • Added SIMD support for distance transform function #28636

  • Fixed fitEllipseDirect/AMS determinant threshold for near-circular data #28628

  • Optimized tiled parallel box filter with TLS buffers and custom border fill #28830

  • Fixed ROI handling in 2D-tiled parallel execution in FilterEngine #29159

  • Fixed Apple conversions build without AVFoundation #29138

  • Fixed floodFill simple path #29187

  • Speed up first BGR2Lab and BGR2Luv call by building the color LUT faster #29253

  • Fixed missing tipLength validation in arrowedLine #29191

  • Optimized EMD (Earth Mover's Distance) solver performance #29194

  • Improved Parallelism and Memory Access Efficiency for Hough Transform Accumulator #29059

  • Fixed remap nearest rounding #29145

  • Fixed matchTemplate TM_SQDIFF precision loss for CV_8U images #29096

  • Improved color convert and AVX512 dispatch added #28992

  • Optimized LUT and equalizeHist with SIMD #29250

  • Optimized remap interpolation #29507

  • Optimized PyrDown #28650

  • Fixed IPP warpAffine #28562

  • Disabled ipp path for 32FC1 in ipp_hal_warpPerspective

  • Disabled IPP implementation for warpPerspective F32C4 as it triggers exception on Windows #29490

  • Restored IPP integration for Sobel and Schaar #29328

  • Extracted following IPP integrations as HAL: resize #29374, cvtColor #29397, calcHist #29511, distanceTransform #29463, threshold #29491, Canny #29434

  • Filter2D IPP migration to HAL for 4.x #29427

  • Extracted IPP integration as HAL function for box_filter #29420

  • Moved IPP-based Sobel and Scharr to HAL #29417

  • Made RVV HAL resize bit-exact for 8U INTER_LINEAR #29473

  • Added Laplacian hal for riscv-rvv: #28887

  • Added RVV HAL for spatialGradient #29062

  • Re-enabled RVV integral for safe cases #29163

  • hal/riscv-rvv: Fix test failures on hardware that implements tail-agnostic as all 1s #28375

• Imgcodecs module:

  • Allow TIFF compression schemes for 32F #28785
  • imgcodecs: fix integer overflow in BMP and SunRaster decoders #28379
  • imgcodecs(webp): improve IMWRITE_WEBP_LOSSLESS_MODE to support exact lossless compression #28519
  • Fix invalid PAM decoding #28753, oss-fuzz 497290557
  • Added support for cICP metadata in imreadWithMetadata() #28615
  • Fixed JPEG chroma configuration & Standardize component settings #28667
  • Fixed UBSan load-invalid-value in SunRasterDecoder::readHeader #29151
  • Improved EXIF profile handling #29295, #29322
  • Fixed out-of-bounds write when reading 2-channel PAM #29296

• Flann module:

  • Helped compiler vectorize loops in meanSplit #28545
  • Fixed Index::radiusSearch output size mismatch #28990
  • Used per-thread storage for heap pool to remove lock contention #29346
  • Bound kd-tree node indices when loading a saved flann index #29503

• Features2d module:

  • Added missing KAZE DIFF_CHARBONNIER support #28324
  • Added OpenCL acceleration for BFMatcher cross-check #28735
  • OpenCL BFMatcher optimization for crosscheck case #28828
  • Added OpenCL support for AKAZE features #28879
  • Optimized FAST for RISC-V RVV #28938, #29197 …

June, 2026

OpenCV 5.0 has been released: https://opencv.org/opencv-5/!

ChangeLog is TBD

Here is the summary and the migration guide

December, 2025

New Year update for OpenCV 4.x has been released.

• CVBenchmark

  • An unbiased CPU benchmark by OpenCV (https://github.com/opencv/cvbenchmark) that provides an evaluation of different CPUs in real-world computer vision and AI workloads is released.

• Core module:

  • Modified Input/OutputArray methods to handle 'std::vector' or 'std::vector<std::vector>' in more accurate way #28242
  • Made cuda::GpuMatND compatible with InputArray/OutputArray #23913
  • Forced output type for empty matrices where it's defined in API #27972
  • Added std::vector length check Input/OutputArray #27817
  • Added 16-bit LUT and corresponding HAL entrypoint #27890, #27911
  • Add cv::Mat::copyAt for for ROI operation #27318
  • Extended JSON support in cv::FileStorage: null parsing #27579 and
  • Added support parsing null in JSON parser in cv::FileStorage #27579 and back slash "" support #27587
  • Fixed cv::solveCubic numerical instability via coefficient normalization #28117
  • Fixed tempfile race condition on Windows #28087
  • Restore parallel framework name on failure attempt #27802
  • Dropped OPENCV_FOR_OPENMP_DYNAMIC_DISABLE environment variable in favor of standard OMP_DYNAMIC #28122
  • Enabled fp16 conversions, but disabled NEON FP16 arithmetics on Windows for ARM #27897
  • Fixed dot product accumulation causing NORM test failures on Windows ARM64 #28211
  • Added several performance optimizations for Windows on ARM: #27575, #27596
  • Fixed missing vec_cvfo on IBM POWER9 due to unavailable VSX float64 conversion #27990
  • Fix in-place flip in HAL for RISC-V RVV #28180
  • Added inRange HAL entry point #27854
  • Disabled IPP with AVX512 in cv::compare because of performance regression #28311

• Imgproc module:

  • Added Iterative Phase Correlation #28146, paper
  • Added cv::minEnclosingConvexPolygon #27369
  • Improved near-zero convexity handling in cv::convexHull #28043
  • Kept cv::convexHull output indices monotone if possible #28163
  • Fixed overflow in connected components #27582
  • Corrected cv::minAreaRect to follow documentation (force angle to range [-90, 0)) #28051. Versions of OpenCV with different angle range are 4.5.1-4.12.0. Expected angle range documented first time in 4.12.0 release.
  • Increased minAreaRect accuracy with doubles #28149
  • Added cv::CLAHE::BitShift option #28014
  • Fixed cv::minEnclosingCircle #27904, #27914
  • Fixed standard cv::HoughLines output shift for rho. #27992
  • Fixed LINE_4/LINE_8 swap in cv::drawContours #28088
  • Fixed bug in approxPolyDP: calculate distance to a segment, not to a line #28119
  • Various performance optimizations for Gaussian Blur, including AVX512 #27795 and blur #27822, bilateralFilter #27433.
  • Added CV_SIMD_SCALABLE branch to pointSetBoundingRect #27479
  • Added Canny, Scharr and Sobel for riscv-rvv hal #27378
  • Optimized ThickLine() for distant points #27366
  • Fixed heap-buffer-overflow in stackBlur #28233 #28250
  • Fixed the out-of-bounds read in cv::bilateralFilter for 32f images #28259
  • Fixed memory leak in ipp_warp function #27532
  • Set limitation to IPP Bilateral Filter tiles number to avoid too small tiles #27720
  • Fixed incorrect implementation of multi-threaded call for warp perspective in IPP HAL #27903
  • Added stateless HAL for filters and morphology #28208

• Imgcodecs module:

  • Extended metadata support in Jpeg (ICCP and XMP) #27583, PNG and WebP #27503, cICP field in PNG #27741, AVIF (XMP) #27506, #28072.
  • Added OpenEXR multispectral read/write support #27485
  • Added strict validation for encoding parameters #27621, #27769
  • Relaxed decoding size limit to over 1 GiB for several formats #27811, #27976
  • Added IMWRITE_PNG_ZLIBBUFFER_SIZE option support for PNG #27551, #27615
  • Fixed memory leak in WebP backend #27849
  • Added workaround for image flipping bug in older GDAL FITS drivers #27919
  • Added support for 32bpp BMP with BI_BITFIELDS #27559
  • Fixed several overflow and out-of-bound access issues in BMP #28040, #27847
  • Fixed potential crashes in PNG found by fuzzer. Namely 429429085, 429645379, 430091585 #27529
  • Fixed several potential overflows and error handling mistakes in PNG #28249, #28196, 27750
  • Fixed alpha handling for blending in PNG format #27981
  • Set matrixCoefficients to UNSPECIFIED for monochrome images in AVIF #28065
  • Added safety checks for AVIF decoder and encoder #28200

• VideoIO module:

  • Added option to open camera device by index through FFmpeg #27841, Added FFmpeg 8.0 support #27691, #27746
  • Extended Orbbec SDK support: added timestamps #27610, options for custom fps and resolution #27629, camera distortion coefficients as API #27663
  • Extended Aravis SDK support: allowed system-wide installation of SDK #28090, set default pixel format for cameras with unsupported format #28086
  • Added macOS support for Orbbec Gemini330 camera #27930
  • Fixed frame seeking with negative DTS values in FFMPEG backend #27878
  • Fixed CvCapture_FFMPEG::setProperty(CAP_PROP_POS_*) followed by getProperty #27523
  • Added Raspberry Pi 4 and 5 V4L2 Stateless HEVC Hardware Acceleration with FFmpeg #27453
  • Optimized FFmpeg VideoCapture with swscale threads option #27755
  • Fix return code from CvVideoWriter_FFMPEG::writeFrame() when encapsulating ##27737
  • Added OPENCV_FFMPEG_SKIP_LOG_CALLBACK to preserve custom FFmpeg logging #27864
  • Get code to compile without FFMPEG's libavdevice #27948
  • catch _com_error exceptions to suppress debugger flooding #28073
  • Fixed picture_sw object leak in ffmpeg backend with hardware codecs. #28283
  • videoio(dshow): Fix incorrect mapping for White Balance Temperature (CAP_PROP_WB_TEMPERATURE) property #28202
  • Fixes a crash on iOS when calling VideoWriter::release() in OpenCV 4.12.0 #28173.

• Features2D module:

  • Fixed ORB inconsistency for masks with values differs from 255 #26366
  • Fixed pointer arithmetic in BRISK corner traversal #28091
  • Added heuristic to allocate buffer for FAST features depending on input image resolution #27657
  • Optimized AGAST for Windows on ARM #27776
  • Added FAST to RISC-V RVV HAL #27391

• Objdetect module:

  • Added pixel-based confidence in ArUco marker detection #23190
  • Improved multiple QR codes detection with QRCodeDetector::detectAndDecodeMulti #27787
  • Fixed to prevent QR code decoding from throwing on degenerate source points #27837
  • Fix QRCodeDetector::detectAndDecode crash in case of inconsistent detection #27877
  • Remove floating point arithmetic from angle computation in QR codes #28157
  • Speedup ChArUco by avoiding temporary copies #27820 …

July, 2025

Summer update for OpenCV 4.x

• Core Module:

  • Added user-defined logger callback #27154
  • Added reinterpret() method to cv::Mat #25394
  • Fixed empty ND-array construction #27362
  • Fixed bug with int64 support for FileStorage #26846
  • Fixed cv::meanStdDev overflow for large images #26867
  • Useed HAL for cv::mean function too #26895
  • Vectorized cv::normalize / cv::norm #26885
  • Enabled SIMD_SCALABLE for exp and sqrt #26886
  • vectorized normDiff with universal intrinsics #27042
  • Refactored normDiff in hal_rvv and extended with support of more data types #27115
  • Further vectorized copyTo with mask #27145
  • Fix POWN OpenCL implementation #27274
  • Restored legacy universal intrinsics operators in a separate header #27327
  • Improved solveCubuc accuracy: #27331, #27347
  • Deprecated copyData Parameter in cv::UMat construction from std::vector and always copy data #27408

• Imgproc Module:

  • Optimized and reduced memory consumption in cv::findContours #26690, #26834
  • Fixed integer overflow in cv::HoughLinesProbabilistic with very large input images #26744
  • Fixed several potential overflows in image warping #26765, #26776
  • Improved robustness for ellipse fitting #26773
  • Added cv::THRESH_DRYRUN flag to get adaptive threshold values without input thresholding #26836
  • Fixed cv::getPerspectiveTransform for singular case #26926
  • Optimized bayer2Gray with universal intrinsics #26868
  • Added optional mask to cv::threshold #26842
  • Accelerated cv::remap calculation with multi-threading, when cv::WARP_INVERSE_MAP is used #27108
  • Reworked HSV color conversion tables initialization in OpenCL branch to fix possible data raise #27287
  • Fixed bilateral filter's sigma color and sigma space issue #27309
  • Impoved performance of medianblur #27299
  • Added cv::getClosestEllipsePoints function to get the closest point on an ellipse #26299
  • Corrected IPP implementation for cv::distanceTransform results with single thread #27432
  • Fixed cv::matchTemplate with mask crash #26703
  • Added diamond structuring element to morphology operations #27441, #27492
  • Improved cv::intersectConvexConvex accuracy in corner cases #26974

• Calib3d module:

  • Fixed inliers updating in homography estimation #26742
  • Added cv::solvePnPRansac implementation for the fisheye camera model #26669
  • Fixed different marker ordering with cv::findChessboardCornersSBWithMeta and cv::CALIB_CB_LARGER flag.
  • Fixed logical mistake in FilterSpecklesImpl #26996
  • Optimized undistort points for the fisheye camera model #26988
  • Optimized new camera matrix estimation and some related functions #27001
  • Added warning if projected axes are out of camera frame in cv::drawAxes function #27311
  • Added image dimension check to avoid StereoSGBM non-determinism #27305
  • Fixed bugs in SQPNP orthogonalization and simplified column vectors copying #27437

• DNN Module:

  • Added TFLite StridedSllice (without strides but just Slice) and enable strides for TF importers #27273
  • Added fusion handler of conv+eltwise in case of multi-output node (i.e. Split) #27326
  • Added new ops import in TFLite parser: SUB, SQRT, DIV, NEG, SQUARED_DIFFERENCE, SUM #27307
  • Fxied scalars and 1d tensors support in TFLite parser #27307
  • Reduced number of NHWC<->NCHW conversions in TFLite parser #27307
  • Added checks before getting latest pin in Net::Impl::getLatestLayerPin #27353
  • Added OpenVINO NPU support #27363
  • Added more operations to CANN backend #24756

• Objdetect module:

  • Extend ArUcoDetector to run multiple dictionaries in an efficient manner #26934.
  • Fixed rotated aruco marker board generation #26753
  • Fixed incorrect Aruco marker detection near image edge #26968
  • Fixed invalid vector access in QR de/encoder #26532
  • Fix QR code encoder with auto version #27244
  • Aded QRCode ECI encoding support #24426, #27486
  • Made ChAruco board consistency check optional #26824

• Photo Module:

  • Added 16-bit support to cv::fastNlMeansDenoising and updated tests #26831
  • Local decolor pipeline optimization #27041
  • Fixed Triangle Weights used by Debevec algorithm being non zero at extremes #27270
  • Fixed NaNs in HDR Triangle Weights and Tonemapping and Update LDR Ground Truth in tutorial #27396

• VideoIO Module:

  • Fixed invalid custom FFmpeg options handling provided with environment variable #26793
  • Fixed default cv::CAP_PROP_ORIENTATION_ATUO behaviour #26800
  • Improved camera opening performance when with DShow backed, if custom options are provided #26601
  • Added zoom support into Android native camera capture #26837
  • Fixed V4L frame size for non-BGR output #27193
  • Added Orbbec Gemini 330 camera support #27230
  • Fixed cv::VideoWriter failure on writing colorless images #27153
  • Fixed Android setCameraIndex issue #27419

• Imgcodecs:

  • Extended image I/O API with metadata support #27499
  • Added in-memory animation encoding and decoding #27013
  • Added hidden frame support for Animated PNG #27127
  • Added GIF decode and encode for imgcodecs #25691, #26971, #26859, #26738, #26930, #27081, #27138, #27296
  • Added animated WebP Support #25608, #27457
  • Added GDAL multi-channel support #27458
  • Fixed AVIF linkage on Windows #26762
  • Significantly improved PNG and Animated PNG files handing #26849, #26739, #26748, #26782, #26832, #26835, #26848, #26851, #26854, #26915, #27040, #27087, #27297
  • Added several fixes for libspng integration #27314
  • Fixed memory leak in JpegXL decoder #26787
  • Added support for cv::IMREAD_UNCHANGED and other ImreadFlags into JpegXL implementation #26788
  • Implemented imdecode() for JpegXL to directly read from memory #26844
  • Added lossless compression support for JpegXL #27384
  • Fixed cv::imread() implementation for 16-bit png with libspng back-end #27113

• Highgui Module:

  • displayOverlay doesn't disappear after timeout #27082
  • Fix closing of windows when using the Qt backend #27170
  • Fixed QT window resize regression #27282

• G-API module:

  • Workaround for successfull append of OpenVINO Execution Provider: Moved creation of 'Ort::Env' before it #26983
  • Adding AddRgbFeature(), and improving robustness in ComputeRgbDistance #26682
  • Added MS Media Foundation availability check in G-API too #27355

• Video Module: …

OpenCV 4.11.0 has been released.

:hammer_and_wrench: Change log is here.

fab645f6b42e4f02ed43e57191cab37b00b861d13191afa34d68fc9f3d8ff763  opencv-4.11.0-android-sdk.zip
165f43c51ea2710f94307fea10c86b6376b63d5162182ba5f040d7a835fb4451  opencv-4.11.0-docs.zip
1e83edcd3e482228f5c2348a7ceafd72efd614b6578e68f610cd0898c6df95d1  opencv-4.11.0-ios-framework.zip
7c9d1c0b70db1b1952cc815252fced9a07f51267563cf3eaa1674d734c49b8e4  opencv-4.11.0-windows.exe

OpenCV 5.0.0-alpha has been released.

The alpha release for the new OpenCV generation. The release is designed as technology preview and not ready for production usage yet. :hammer_and_wrench: Chnagelog: https://github.com/opencv/opencv/wiki/OpenCV-Change-Logs#version50-alpha

c450cd4340de2109a5c7036e6495e3d6  opencv-5.0.0-alpha-android-sdk.zip
218351f5f5c4e424ab8b3e7116c66678  opencv-5.0.0-alpha-docs.zip
fbf55f5cf2bd9c70c9439b9653bd3a10  opencv-5.0.0-alpha-ios-framework.zip
ea3bc24a8c5e2ce0f771f5c209ef5098  opencv-5.0.0-alpha-windows.exe

OpenCV 4.10.0 has been released.

:hammer_and_wrench: Change log is here.

464d55abe64b53af3aeb73197cf4620535abd909916d06e6a8b7c32712013966  opencv-4.10.0-android-sdk.zip
0ff1b7246fec72a0f5243cbac5ae663b04c6773fbb11f6b69e86ac20239d0ade  opencv-4.10.0-docs.zip
cbd21c62a4cfdd4cfe7e69c8601d23976e2d2bd05a912d0759debb3052c257db  opencv-4.10.0-ios-framework.zip
bff38466091c313dac21a0b73eea8278316a89c1d434c6f0b10697e087670168  opencv-4.10.0-windows.exe

OpenCV 4.9.0 has been released.

:hammer_and_wrench: Change log is here. Since 4.9.0 OpenCV package for Android is also available as AAR on Maven Central: https://central.sonatype.com/artifact/org.opencv/opencv

d181481fdabf6c02b1b45a3b382a583c531bb4d6b0582d0fbbb686487f071218  opencv-4.9.0-android-sdk.zip
0fce577941eea0db27d2c37b7c46785db23de6520b725b8f0dca7c46b368b18c  opencv-4.9.0-ios-framework.zip
fefddff0623fbd5a6fa0cecb9bccd4b822478354e6c587ebb6e40ab09dacba51  opencv-4.9.0-windows.exe
1e71ceb6220c94bd917ee48b29284e43883e066a3c7129e27f5c2a4ffbab8275  opencv-4.9.0-docs.zip

OpenCV 4.8.1 has been released.

:hammer_and_wrench: Change log is here.

SHA256 sum for packages:

a8bfe53cf9d7fa94ed5d85d61cf028348a6a1268b8027c9bc95ca96edd90ba13  opencv-4.8.1-android-sdk.zip
0689312a9de439757618a412b266dc5ee75d2e32aefa9eac32c3f808ade06331  opencv-4.8.1-ios-framework.zip
037dd1c5c172237b0a00ee822684e5ac453028e1933111a2c547b62061f8b7e4  opencv-4.8.1-windows.exe

OpenCV 4.8.0 has been released.

:hammer_and_wrench: Change log is here.

SHA256 sum for packages:

e415d976549be7aa56a909cedb7d9b5b7fd24dbdd0eabee94de0f004c52ddc7c  opencv-4.8.0-android-sdk.zip
89c33d2b0a66b287ffc7a7643bfed4ae4a0728a76a5c4c852854efdb300693b3  opencv-4.8.0-ios-framework.zip
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8e7ea70b52ce28b521367368cdadfc8457b36046dcbc5c3ed83d094edb6e35d9  opencv-4.8.0-docs.zip