Class lsst::afw::cameraGeom::Amplifier

class Amplifier

Geometry and electronic information about raw amplifier images

The Amplifier class itself is an abstract base class that provides no mutation or copy interfaces. Typically Amplifiers are constructed via the Builder subclass, which can produce a shared_ptr to an immutable Amplifier instance.

Here is a pictorial example showing the meaning of flipX and flipY:

    CCD with 4 amps        Desired assembled output      Use these parameters

    --x         x--            y
   |  amp1    amp2 |           |                               flipX       flipY
   y               y           |                       amp1    False       True
                               | CCD image             amp2    True        True
   y               y           |                       amp3    False       False
   |  amp3    amp4 |           |                       amp4    True        False
    --x         x--             ----------- x

Note

• All bounding boxes are parent boxes with respect to the raw image.

• The overscan and prescan bounding boxes represent the full regions; unusable regions are set via ISR configuration parameters.

• xyOffset is not used for instrument signature removal (ISR); it is intended for use by display utilities. It supports construction of a raw CCD image in the case that raw data is provided as individual amplifier images (which is uncommon):

  • Use 0,0 for cameras that supply raw data as a raw CCD image (most cameras)

  • Use nonzero for cameras that supply raw data as separate amplifier images with xy0=0,0 (LSST)

• This design assumes assembled X is always +/- raw X, which we require for CCDs (so that bleed trails are always along the Y axis).

Subclassed by lsst::afw::cameraGeom::Amplifier::Builder