How to 'use' object detection result

Autonomous Machines Jetson & Embedded Systems Jetson Nano
#1

Hello everyone,
I am new to programming and the world of machine learning.
I understand there is a lot of fantastic open source dataset like ResNet, GoogleNet etc, that is capable to detect everyday object like cars, person etc.
My question is how can I make use of the result - let say if I want to start a video recording based on object detected on the frame. e.g only start recording if there is only car and people detected. In a high level senses, how I hook the software together to allow my jetson nano to have the capability.
As far as my research goes, I assume I can use a python script and ‘if, else’ statement?
Sorry for the noob question but I just hope someone can give me guidance on how and where I should look more into this

Thanks a lot!

#3

Hi,

It’s recommended to check our Deepstream SDK.

You can add the function like if a bbox is detected, then encoding the frame.

Thanks.

1 Like
#4

Thanks for the reply. After some reading up the documentation and course on DLI I am still confused as to how to get started about it. I understand there is a feature on testapp-5 with smart video recording. But how do I implement it, like as you described (add function like encoding the frame when bbox is detected). Can you elaborated more and describe the steps required. I cannot find any tutorial on this topic. Thank you very much

#5

Hi,

1.
First, it’s recommended to check our basic pipeline that can detect car and people with nvinfer.

/opt/nvidia/deepstream/deepstream-5.0/sources/apps/sample_apps/deepstream-test1

If an object is detected, the app will call osd_sink_pad_buffer_probe to draw the bounding box.
So you can add the smart record component into this (or in the same way).

2.
As you already know, deepstream-test5-app is a sample to demonstrate how to use SR component.
You can follow it to add the SR component into the deepstream-test1.

In general, SR can be initiated with NvDsSRCreate and starts with NvDsSRStart.
For more details, please check the below document for reference:
https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_Smart_video.html

Thanks.

#7