MeteringPoint is used to specify a region which can then be converted to sensor
coordinate system for focus and metering purpose.
MeteringPoint is a opaque handle to a metering point created by a
MeteringPointFactory, for use when building a
coordinates of the point are specified by the application when creating points from the
factory, and then the coordinates are converted into an internal representation stored by this
class. Because of the nature of internal representation, the X and Y of the
MeteringPoint is not publicly visible. These are for internal use only.
FocusMeteringAction is submitted via
converted to a point in the sensor coordinate system where it defines the center of a metering
rectangle. If zoom is applied via
CameraControl , it will set a crop region calculated
by the zoom and the final coordinates will be mapped into the crop region. If not set, it is
mapped to the sensor active array.
Besides defining the center point of the metering rectangle, there is also the size of the
MeteringPoint. The size of the
MeteringPoint ranges from 0 to 1.0.
The size are the percentage of sensor width and height (or crop region width/height if
crop region is set). See formula below:
Metering rectangle width = size * sensorSizeOrCropRegion.width Metering rectangle height = size * sensorSizeOrCropRegion.heightThe metering rectangle defined by the
MeteringPointhas the same shape as the sensor array.
Size of the MeteringPoint width and height (ranging from 0 to 1).
public float getSize ()
Size of the MeteringPoint width and height (ranging from 0 to 1). It is the percentage of the sensor width/height (or crop region width/height if crop region is set).
Crop region is set when zoom is set in
CameraControl and it is the region
inside the sensor active array and it defines the output region of the sensor. See
Metering rectangle width = size * sensorSizeOrCropRegion.width Metering rectangle height = size * sensorSizeOrCropRegion.height