Holoscan Operators
Holoscan operators are the building blocks of Holoscan applications — reusable processing units in HoloHub for data ingestion, transformation, visualization, AI inference, and output. Browse this Holoscan ecosystem collection to accelerate development of real-time sensor processing pipelines.
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OnlineVideoReasonerOp
PythonSamples live RGB frames, submits either a JPEG or one bounded MP4 clip to an OpenAI-compatible multimodal reasoner, and emits incremental or completed text.
FoxglovePublisherOp
C++, PythonPublishes Holoscan sensor and inference messages to Foxglove over WebSocket with optional MCAP recording.
Atracsys Camera Operators
C++Optional live-camera operators for Atracsys hardware, including the master source and structured-light point-cloud conversion path.
AtracsysModeSwitcherOp
C++Replay and visualization operator that switches between visible, infrared, structured-light, and tracking modes while projecting tracked fiducials into Holoviz overlays.
DocaRoceReceiverOp
C++GPU-resident Holoscan SDK Operator for receiving video frames over RoCE using DOCA GPUNetIO for GPU-side CQ polling, eliminating CPU from the critical path.
TapNextInferenceOp
C++, PythonThe operator runs TensorRT inference for TapNext-style architectures, where an initialization model processes the fir...
PVARadarPipelineOp
C++The PVA Radar Operator demonstrates RADAR signal processing offload using NVIDIA's PVA (Programmable Vision Accelerat...
PVARadarGraphicsOp
C++The PVA Radar Operator demonstrates RADAR signal processing offload using NVIDIA's PVA (Programmable Vision Accelerat...
RawRadarCubeSourceOp
C++The PVA Radar Operator demonstrates RADAR signal processing offload using NVIDIA's PVA (Programmable Vision Accelerat...
RoceReceiverOpNmd
C++Operator for receiving video frames over RoCE (RDMA over Converged Ethernet) directly to GPU memory. In addition to the Holoscan Sensor Bridge (v2.5) implementation, this operator provides an option to skip copying metadata from the device memory to the host memory. This is useful for GPU-resident processing pipelines.
CsiToBayerGpuResidentOp
C++GPU-resident operator that converts CSI (Camera Serial Interface) packed data to Bayer format for image processing pipelines.
ImageProcessorGpuResidentOp
C++GPU-resident operator for image processing including optical black correction, histogram calculation, and white balance.
DisplayGpuResidentOp
C++GPU-resident operator for displaying processed image frames using cuDisp for direct GPU-to-display rendering with gamma correction.
ST2110SourceOp
C++, PythonThe ST 2110 Source operator receives SMPTE ST 2110-20 uncompressed video streams over IP networks.
UCXX Send/Receive Operators
C++Operators for sending and receiving messages through a UCXX endpoint.
GStreamer Bridge Operators
C++, PythonGStreamer bridge operators for video recording and streaming in Holoscan applications
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StreamingServerOps
C++, PythonThe operator provides a modular streaming server implementation with separate upstream, downstream, and resource comp...
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VideoStreamingClientOp
C++, PythonThe VideoStreamingClientOp class implements a Holoscan operator that provides bidirectional video streaming capabilit...
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VideoStreamingOps
C++A unified package containing both streaming client and server operators for real-time video communication in Holoscan...
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Holoscan ROS2 Bridge
C++, PythonThe Holoscan ROS2 Bridge extension provides interoperability between NVIDIA Holoscan and ROS2 (Robot Operating System...
IIO Controller Operators
C++, PythonThe IIO Controller provides a comprehensive set of operators for interfacing with Industrial I/O (IIO) devices in Hol...
streaming_server
C++Holoscan operator for receiving and serving video data streams using NVIDIA Streaming SDK. Provides server-side streaming capabilities with support for multiple client connections and real-time video processing.
streaming_client
C++, PythonHoloscan operator for streaming video data to remote servers using NVIDIA Streaming SDK. Provides real-time video streaming capabilities with support for various video formats and configurable streaming parameters.
Orsi Academy Operators
C++, PythonA collection of specialized operators for medical imaging and surgical visualization applications, providing comprehe...
DDS Operators
C++Data Distribution Service (DDS) operators for RTI Connext, enabling real-time, scalable, and reliable data exchange in distributed systems using the DDS middleware standard.
NVIDIA Video Codec SDK: Video File Reader
C++, PythonThis operator reads H.264/H.265 video files and emits raw encoded frames one at a time. The frames remain in their compressed format for processing by downstream operators like nv_video_decoder.
NVIDIA Video Codec SDK: Encoder
C++, PythonThis operator encodes a video stream into a compressed format using the NVIDIA Video Codec SDK.
NVIDIA Video Codec SDK: Decoder
C++, PythonThis operator decodes a video stream from a compressed format using the NVIDIA Video Codec SDK.
ZeroMQSubscriberOp
PythonA Holoscan operator that subscribes to messages from a ZeroMQ message queue using the PUB/SUB pattern.
ZeroMQPublisherOp
PythonA Holoscan operator that publishes messages to a ZeroMQ message queue using the PUB/SUB pattern.
FhirClientOperator
PythonA Holoscan operator that enables seamless interaction with FHIR (Fast Healthcare Interoperability Resources) services...
FhirResourceSanitizerOp
PythonA Holoscan operator that processes and sanitizes FHIR medical records into a standardized, AI-friendly format while m...
DICOMDataLoaderOperator
PythonThis operator loads DICOM studies into memory from a folder of DICOM instance files.
STLConversionOperator
PythonThis operator converts medical imaging data to STL format for 3D visualization and printing.
DICOMSeriesToVolumeOperator
PythonThis operator converts a DICOM series into a volumetric image for downstream analysis in medical imaging workflows.
MonaiBundleInferenceOperator
PythonThis operator performs inference using MONAI Bundles for medical imaging tasks.
DICOMSeriesSelectorOperator
PythonThis operator selects specific DICOM series from a set of studies for further processing in medical imaging workflows.
DICOMSegmentationWriterOperator
PythonThis operator writes segmentation results into DICOM Segmentation objects for medical imaging workflows.
DICOMEncapsulatedPDFWriterOperator
PythonThis operator writes encapsulated PDF documents into DICOM format for medical imaging workflows.
ClaraVizOperator
PythonThis operator integrates Clara Viz visualization into medical imaging pipelines.
PNGConverterOperator
PythonThis operator converts medical images to PNG format for visualization or storage.
MonaiSegInferenceOperator
PythonThis segmentation operator uses MONAI transforms and Sliding Window Inference to segment medical images.
DICOMTextSRWriterOperator
PythonThis operator writes DICOM Structured Report (SR) objects containing text results for medical imaging workflows.
InferenceOperator
PythonThis operator provides a base class for running inference in medical imaging pipelines.
PublisherOperator
PythonThis operator publishes medical imaging data to downstream consumers or external systems.
NiftiDataLoader
PythonThis operator loads NIfTI (nii/nii.gz) medical images for use in Holoscan pipelines.
PixelatorOp
PythonA Pixelation-based Deidentification Operator In medical and sensitive imaging workflows, pixelation is a common metho...
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XR Operators
C++, PythonA collection of Holoscan operators for XR (Extended Reality) integration, enabling real-time XR applications with Vul...
AJASourceOp
C++, PythonThe AJA Source operator provides functionality to capture high-quality video streams from AJA capture cards and devices.
FFT
C++The FFT operator takes in a tensor of complex float data, performs an FFT, and emits the resultant tensor.
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EHR Query LLM Operators
PythonThe EHR Query LLM Operators are a Holoscan operator that provides a robust interface for querying and processing Elec...
ApriltagDetectorOp
C++, PythonThe extension provides real-time detection of April tags from different tag families.
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GRPC Operators
C++, PythonThis directory contains the Holohub gRPC plugins for Holoscan SDK, including: Please refer to the gRPC h.264 Endoscop...
RealsenseCameraOp
C++The RealSense Camera Operator captures synchronized color and depth frames from Intel RealSense cameras using the Rea...
DDSShapesSubscriberOp
C++This operator subscribes to DDS topics published by the RTI Connext shapes demo.
VelodyneLidarOp
C++A Holoscan operator to convert packets from the Velodyne VLP-16 Lidar sensor to a point cloud tensor format.
VtkRendererOp
C++, PythonThe extension takes the output of the source video player and the output of the operator and renders the video stream...
Holoscan CvCuda Interop Ops
C++This directory contains two operators to enable interoperability between the CVCUDA and Holoscan tensors: and .
SendMeshToUSDOp
PythonThe operator converts 3D meshes in STL format to USD (Universal Scene Description) mesh format for integration into O...
OpenIGTLink Tx/Rx
C++The operator provides a way to send and receive imaging data using the OpenIGTLink library.
FormatConverterOp
C++, PythonA collection of specialized operators for medical imaging and surgical visualization applications, providing comprehe...
SegmentationPreprocessorOp
C++, PythonA collection of specialized operators for medical imaging and surgical visualization applications, providing comprehe...
OrsiVisualizationOp
C++, PythonA collection of specialized operators for medical imaging and surgical visualization applications, providing comprehe...
SegmentationPostprocessorOp
C++, PythonA collection of specialized operators for medical imaging and surgical visualization applications, providing comprehe...
QCAPSourceOp
C++, PythonThe operator provides video stream capture from YUAN High-Tech capture cards, supporting various video formats and co...
ProhawkOp
C++The Prohawk Video Processing Operator is a Holoscan SDK operator that integrates Prohawk Technology Group's video res...
VolumeRendererOp
C++The operator renders a volume using ClaraViz (https://github.com/NVIDIA/clara-viz).
LSTMTensorRTInferenceOp
C++, PythonThe extension provides LSTM (Long-Short Term Memory) stateful inference module using TensorRT.
ToolTrackingPostprocessorOp
C++, PythonThe extension provides a codelet that converts inference output of used in the endoscopy tool tracking pipeline to be...
EmergentSourceOp
C++, PythonThis operator provides support for Emergent Vision Technologies cameras as video sources.