# ALMovementDetection API¶

NAOqi Vision - Overview | API

Namespace : AL


#include <alproxies/almovementdetectionproxy.h>



## Method list ¶

class ALMovementDetectionProxy
• As any module, this module inherits methods from ALModule API.
• It also inherits methods from ALExtractor API and ALVisionExtractor API.
• It also has the following specific methods:
• And has the following specific methods if 3d camera available:
• Otherwise, on Aldebaran robots without 3d camera, this module has the following specific methods:

## Methods ¶

void ALMovementDetectionProxy::resetDetection()

Resets to zero the values of the previously seen depth images, which resets the detection of movement. For example, this function is automatically called when the robot just moved, in order to avoid false positives that could be induced by the robot’s movements.

float ALMovementDetectionProxy::getColorSensitivity()

2d sensor only

Gets the value of the color sensitivity (between 0 and 1) used for the detection of movement with the RGB camera.

void ALMovementDetectionProxy::setColorSensitivity(const float& sensitivity)

2d sensor only

Sets the value of the color sensitivity (between 0 and 1) used for the detection of movement with the RGB camera. The lower this sensivity is, the higher the variation of color value of a pixel, between two frames, must be to be detected as movement.

float ALMovementDetectionProxy::getDepthSensitivity()

3d sensor only

Gets the value of the depth sensitivity (in meters) used for the detection of movement with a depth camera.

void ALMovementDetectionProxy::setDepthSensitivity(const float& sensitivity)

3d sensor only

Sets the value of the depth sensitivity (in meters) used for the detection of movement with a depth camera. The variation of depth of a pixel, between two frames, must be higher than this sensitivity to be detected as movement.

## Events ¶

Event: "MovementDetection/MovementDetected"
callback(std::string eventName, std::string subscriberIdentifier)

Raised each time some movement has been detected in the current camera frame (RGB or depth).

Event: "MovementDetection/NoMovement"
callback(std::string eventName, std::string subscriberIdentifier)

Raised when no movement has been detected in the current camera frame (RGB or depth).

## ALMemory Keys ¶

AL::ALValue MovementDetection/MovementInfo

Contains the information about the latest detected movement. Please refer to ALMovementDetection for details.