NVIDIA Jetson TX2-Camera image capture latency measurement techniques.

For better understanding of this latest blog from RidgeRun, please read the RidgeRun blog on Diving deep into NVIDIA Jetson TX2 - Video Input system and camera image capture latency.

The techniques used to measure the Jetson TX2 image capture latency are outlined in this blog.

Two timestamps are used to measure the latency :

SOF : The first timestamp is taken when the pixels of a frame start to arrive at the VI (t0), this is the start-of-frame (SOF).
The second timestamp is usually obtained at the time when the frame is available on a userspace application (t1).

Techniques can be divided into two main categories, techniques that use the CHANSEL_PXL_SOF (referred to as SOF) and the techniques that do not use the SOF .

Outline of both the methods:

Techniques that use the SOF timestamp

CHANSEL_PXL_SOF can be used as t0 and then, t1 can be the timestamp obtained at the instant when the frame arrives to userspace using ideally the same clock used to set the CHANSEL_PXL_SOF, then the latency can be computed as follows:
Latency = t1 - t0

Techniques that do not use the SOF timestamp

LED test
This test involves the use of a led connected to the TX2 GPIO.
The camera must start capturing when the led is still off, and then a kernel module must turn the led on and then record the current CLOCK_MONOTONIC timestamp to be used as t0. Each image that arrives to userspace must be timestamped also with the CLOCK_MONOTONIC at the instant when it's available, this will be t1.

More technical details about the techniques, working with TSC (Time Stamping System Clock) for the latency measurements and rtcpu, v4l2 tracing details are explained in the RidgeRun developer wiki page : NVIDIA Jetson TX2 - VI Latency Measurement Techniques

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GStreamer Video Stabilizer for NVIDIA Jetson Boards

Many applications require the removal of undesired camera movement. Professional video stitching, medical imaging such as colonoscopy or endoscopy and localization of unmanned vehicles are a few examples of use cases that benefit from video stabilization. Unfortunately, this is a very resource consuming technique that may be unfeasible for real time operations on resource constrained systems such as embedded systems.

The following video provides a hands-on overview of GstNvStabilize on the works!

GstNvStabilize is GStreamer based video stabilizer for NVIDIA Jetson boards. It's based on VisionWorks and OpenVX hardware processing units to accelerate the stabilization for real time applications.

Latest v0.4.0 release include:

- Region-of-interest configuration via GStreamer caps - Smoothing level configuration via GStreamer property - Smart compensation limit to avoid black borders - GPU acceleration - Supported platforms: - NVIDIA Jetson Xavier - NVIDIA Jetson TX1/TX2 - NVIDIA Jetson Nano

Learn more in our developer's wiki:
https://developer.ridgerun.com/wiki/index.php?title=GStreamer_Video_Stabilizer_for_NVIDIA_Jetson_
Boards

Purchase directly from our website:
https://shop.ridgerun.com/products/gstnvstabilize?_pos=1&_sid=0951b9cf7&_ss=r 

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Please visit our Main Website for the RidgeRun online store or Contact Us for pricing information of 
the engineering support, product and services. 
You can also send an email to support@ridgerun.com for a technical support, more information about 
the features, evaluation version (if available) or for a details about how to sponsor a new feature.

GstCUDA: RidgeRun presentation at NVIDIA GTC 2019 on GStreamer and CUDA integration.

RidgeRun engineers presented a GstCUDA, a framework developed by RidgeRun that provides an easy, flexible and powerful integration between GStreamer audio/video streaming infrastructure and CUDA hardware-accelerated video processing at NVIDIA GTC 2019.

GstCUDA: Easy GStreamer and CUDA Integration

Please Watch the Video

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RidgeRun - GStreamer Deep Learning inference plugin: GstInference

GstInference is an open-source project from RidgeRun Engineering that provides a framework for integrating deep learning inference into GStreamer.

Check out the presentation from RidgeRun Engineering team about our latest development on GstInference at Edinburg GStreamer Conference 2018.

GstInference: A GStreamer Deep Learning Framework : https://gstconf.ubicast.tv/videos/gstinference-a-gstreamer-deep-learning-framework/

RidgeRun developer wiki: http://developer.ridgerun.com/wiki/index.php?title=GstInference

For more information please contact us at support@ridgerun.com

Object tracking in Jetson TX1/TX2 using GStPTZR

RidgeRun's new GStPTZR element allows to crop, zoom and rotate a video stream, simulating the behavior of a pan/tilt/zoom/rotate PTZR video camera.

These features, paired with information obtained from a jetson-inference pre-built model, can be used to provide a video stream focused on the detected object.

Captured video (left) is provided to a jetson-inferencce model. The model detects a person and provides the location. GstPTZR is used to crop the area of interest as a separate stream.

Using the GstPTZR element in an already-existing GStreamer pipeline is easy, and can provide a simple way to focus on the important parts of the video stream. 

Captured video (left) and the cropped version obtained with GStPTZR (right) that allow for detection of an object on a specific area of the video.

RidgeRun's GStPTZR is highly customizable and can be used for a wide variety of applications, both paired with detection models and other specific use cases.

For more information, visit www.ridgerun.com/gstptzr and contact us at support@ridgerun.com to request an evaluation version for your application.

The examples in the pictures above were created using models from the Jetson Inference guide.