# SoftBank Robotics documentation What's new in NAOqi 2.8?

# ALBacklightingDetection API

NAOqi Vision - Overview | API

Namespace : AL

    #include <alproxies/albacklightingdetectionproxy.h>

## Method list

class `ALBacklightingDetectionProxy`

- As any module, this module inherits methods from ALModule API.
- It also inherits methods from ALExtractor API and ALVisionExtractor API.

## Events lists

- `BacklightingDetection/BacklightingDetected()`

## ALMemory Keys list

- `BacklightingDetection/BacklightingValue`

## Events

Event: `"BacklightingDetection/BacklightingDetected"`
callback(std::string eventName, std::string subscriberIdentifier)

  Raised when a backlighting situation was just detected (the backlighting value just turned to 2). This event is raised only once for each backlighting situation : as long as the backlighting value equals 2, the event is not raised another time.

## ALMemory Keys

int `BacklightingDetection/BacklightingValue`

  Value of the backlighting measured for each frame (0, 1 or 2, see the explanation in the overview).

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