waitcondition/camera/docs/usecase1.md

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# Copyright (c) 2019-2020, NVIDIA CORPORATION.  All rights reserved.

@page waitcondition_usecase1 Wait Conditions Classification Workflow for Traffic Lights

@note SW Release Applicability: This tutorial is applicable to modules in **NVIDIA DRIVE Software** releases.

The following code snippet shows the general structure of a program that uses waitconditions classifier to classify detected traffic lights from a single camera. Note that error handling is left out for clarity.

Initialize LightNet default parameters and then the module:
```{.cpp}
dwLightNetParams lightNetParams{};
dwLightNet_initDefaultParams(&lightNetParams);
dwLightNet_initialize(&lightNetHandle,&lightNetParams, sdkHandle);
```

Initialize Waitcondition classifier module from initialized LightNet handle:
```{.cpp}
dwTrafficLightSignClassifier_initializeFromLightNet(&lightClassifierHandle,
                                          lightNetHandle,
                                          sdkHandle);
```

Classify detected traffic lights 'trafficLightList' from a frame:
```{.cpp}
dwTrafficLightSignClassifier_inferDeviceAsync(frame, &trafficLightList, numTrafficLights, dwObjectClassTrafficLight, &objectClassifierHandle);
dwTrafficLightSignClassifier_interpretHost(numTrafficLights, dwObjectClassTrafficLight, &objectClassifierHandle);
dwTrafficLightSignClassifier_getClassifiedObjects(&trafficLightList, numTrafficLights, &objectClassifierHandle);

```

When finished, release the module handles:
```{.cpp}
dwTrafficLightSignClassifier_release(objectClassifierHandle);
dwLightNet_release(lightNetHandle);
```

For more detailed workflow, please refer to the ligthClassifier sample: @ref dwx_light_classification_sample