Does nvdspreprocess supports inputs from detector for face alignment use case

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU) T4, RTX4000
• DeepStream Version DS 6.2
• JetPack Version (valid for Jetson only)
• TensorRT Version 8.2.x
• NVIDIA GPU Driver Version (valid for GPU only) 525.85.12
• Issue Type( questions, new requirements, bugs) Question
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)


I am working on face detection application and I would like to use nvdspreprocess for face alignment post face detection?

Will it possible to use nvdspreprocess with nvinferserver (Triton + grpc) deployment?

Do we get access to all output from face detector into nvdsprecess custom lib?

Do you have any example for such use case?

  1. what do you mean about “face alignment post face detection”? nvdspreprocess is used to do preprocess.
  2. Please refer to DeepStream6.2 SDK’s deepstream-3d-action-recognition sample, it is a nvpreprecss + nvinferserver sample.
  1. what do you mean about “face alignment post face detection”? nvdspreprocess is used to do preprocess.

Ans: Getting face co-ordinates from face detector, I want to crop face from input image and do some alignment, so can I use nvdspreprocess to do such operation.

Does nvdspreprocess element other inputs along with primary input?


pgie provides face co-ordinates and key points for face.

There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks

you mean accept? yes, from ds6.2, nvdspreprocess can work after pgie, the pipeline looks like pgie+ nvdspreprocess + sgie, please refer to sample \opt\nvidia\deepstream\deepstream\samples\configs\deepstream-app\source4_1080p_dec_preprocess_infer-resnet_preprocess_sgie_tiled_display_int8.txt

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