ALPR cannot detect trucks on the road

I’m creating ALPR system like this: Creating a Real-Time License Plate Detection and Recognition App | NVIDIA Developer Blog, forwarding successfully so far - Jetson TX2 recognizes car plates very good (ALPR with neuro-net trained with rus characters - YouTube) - but it is missing trucks, speaking about 'Dashcamnet’ i suppose.
Missed trucks:
Volvo - 45s
MAZ - 58s

Question: How to make it to find trucks, should i learn maybe ‘Dashcamnet’ with images of trucks, but then i have to add images of cars, and people, bicycles and road signs? But, here: (NVIDIA NGC) Nvidia says that used:

Object Distribution
Environment Images Cars Persons Road Signs Two-Wheelers
Dashcam (5ft height) 128,000 1.7M 720,000 354,127 54,000
Traffic signal content 50,000 1.1M 53500 184000 11000
Total 178,000 2.8M 773,500 538,127 65,000
A user cannot find so much images.
Also VehicleTypeNet Model Card says: "The model described in this card is a classification network, which aims to classify car images into 6 vehicle types:

  • coupe
  • sedan
  • SUV
  • van
  • large vehicle
  • truck

( NVIDIA NGC) and says: “VehicleTypeNet is generally cascaded with DashCamNet or TrafficCamNet for smart city applications. For example, DashCamNet or TrafficCamNet acts as a primary detector, detecting the objects of interest and for each detected car the VehicleTypeNet acts as a secondary classifier determining the type of the car.” - so it can get trucks from DashCamNet and classify - but it does not.
What will you advice?

PC configuration:
Driver Version: 465.19.01
CUDA Version: 11.3
TensorRT: 7.2.3
deepstream-app version 5.1.0
DeepStreamSDK 5.1.0

• TLT Version (Please run “tlt info --verbose” and share “docker_tag” here)
alex@jetson:~$ tlt info --verbose
Configuration of the TLT Instance

docker_tag: v3.0-dp-py3

  1. augment
  2. classification
  3. detectnet_v2
  4. dssd
  5. emotionnet
  6. faster_rcnn
  7. fpenet
  8. gazenet
  9. gesturenet
  10. heartratenet
  11. lprnet
  12. mask_rcnn
  13. retinanet
  14. ssd
  15. unet
  16. yolo_v3
  17. yolo_v4
  18. tlt-converter
    docker_tag: v3.0-dp-py3
  19. speech_to_text
  20. text_classification
  21. question_answering
  22. token_classification
  23. intent_slot_classification
  24. punctuation_and_capitalization
    format_version: 1.0
    tlt_version: 3.0
    published_date: 02/02/2021


random_seed: 42
lpr_config {
hidden_units: 512
max_label_length: 9
arch: “baseline”
nlayers: 18 #setting nlayers to be 10 to use baseline10 model
training_config {
batch_size_per_gpu: 32
num_epochs: 24
learning_rate {
soft_start_annealing_schedule {
min_learning_rate: 1e-6
max_learning_rate: 1e-5
soft_start: 0.001
annealing: 0.5
regularizer {
type: L2
weight: 5e-4
eval_config {
validation_period_during_training: 5
batch_size: 1
augmentation_config {
output_width: 96
output_height: 48
output_channel: 3
keep_original_prob: 0.3
transform_prob: 0.5
rotate_degree: 5
dataset_config {
data_sources: {
label_directory_path: “/workspace/tlt-experiments/data/openalpr/train/label”
image_directory_path: “/workspace/tlt-experiments/data/openalpr/train/image”
characters_list_file: “/workspace/tlt-experiments/lprnet/specs/ru_lp_characters.txt”
validation_data_sources: {
label_directory_path: “/workspace/tlt-experiments/data/openalpr/val/label”
image_directory_path: “/workspace/tlt-experiments/data/openalpr/val/image”

ru_lp_characters.txt contains:

Please note that the LPDR depends on the car detection. If car can not be detected, there is no further detection for LPD and LPR.
So, for missing trucks, please try to run below in deepstream. In order to use trafficcamnet or dashcamnet to check if the Volvo and MAZ truck can be detected.

$ cd /opt/nvidia/deepstream/deepstream-5.0/samples/configs/tlt_pretrained_models
$ deepstream-app -c deepstream_app_source1_trafficcamnet.txt
$ deepstream-app -c deepstream_app_source1_dashcamnet_vehiclemakenet_vehicletypenet.txt

I launched deepstream-app with resnet18_trafficcamnet_pruned.etlt_b1_gpu0_fp16.engine because i didn’t find resnet18_trafficcamnet_pruned.etlt_b1_gpu0_int8.engine as in config file and result: it sees buses in a state sample video from NVidia and cannot see trucks in youtube video. I have read once more about DashCamNet(NVIDIA NGC), they say in


Occluded Objects
“When objects are occluded or truncated such that less than 40% of the object is visible, they may not be detected by the DashcamNet model. For car class objects, the model will detect occluded cars as long as ~40% of the car is visible.”

I think object (Volvo) is going aside and small part of it is watchable by camera(less than 40%)
In case of ‘MAZ’ the object is taking a too much part of a view so that when camera sees its back board - the front board is already passed (i mean camera is too close to objects)

How do you think is it solvable or better place camera not so close?

The resnet18_trafficcamnet_pruned.etlt_b1_gpu0_int8.engine is configured in config_infer_primary_trafficcamnet.txt

When you run $ deepstream-app -c deepstream_app_source1_trafficcamnet.txt ,it will be generated.
But you are running in TX2, it does not support int8 , see
Support Matrix :: NVIDIA Deep Learning TensorRT Documentation .

So, please check the log and you should see there is an fp16 engine which is generated.
For example, resnet18_trafficcamnet_pruned.etlt_b1_gpu0_fp16.engine

You can also set to fp32 mode in config_infer_primary_trafficcamnet.txt. Then run again to check if the trucks can be detected.

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