File ImageUtils.h

namespace lsst

Class for a simple mapping implementing a generic AstrometryTransform.

Remove all non-astronomical counts from the Chunk Exposure’s pixels.

Forward declarations for lsst::utils::Cache

For details on the Cache class, see the Cache.h file.

It uses a template rather than a pointer so that the derived classes can use the specifics of the transform. The class simplePolyMapping overloads a few routines.

A base class for image defects

Numeric constants used by the Integrate.h integrator routines.

Compute Image Statistics

Note

Gauss-Kronrod-Patterson quadrature coefficients for use in quadpack routine qng. These coefficients were calculated with 101 decimal digit arithmetic by L. W. Fullerton, Bell Labs, Nov 1981.

Note

The Statistics class itself can only handle lsst::afw::image::MaskedImage() types. The philosophy has been to handle other types by making them look like lsst::afw::image::MaskedImage() and reusing that code. Users should have no need to instantiate a Statistics object directly, but should use the overloaded makeStatistics() factory functions.

namespace afw
namespace image

Enums

enum xOrY

Values:

X
Y

Functions

double indexToPosition(double ind)

Parameters

  • ind: image index

Convert image index to image position

The LSST indexing convention is:

  • the index of the bottom left pixel is 0,0

  • the position of the center of the bottom left pixel is PixelZeroPos, PixelZeroPos

Return

image position

int positionToIndex(double pos)

Parameters

  • pos: image position

Convert image position to nearest integer index

The LSST indexing convention is:

  • the index of the bottom left pixel is 0,0

  • the position of the center of the bottom left pixel is PixelZeroPos, PixelZeroPos

Return

nearest integer index

int positionToIndex(double &residual, double pos)

Parameters

  • residual: fractional part of index

  • pos: image position

Convert image position to index (nearest integer and fractional parts)

The LSST indexing convention is:

  • the index of the bottom left pixel is 0,0

  • the position of the center of the bottom left pixel is PixelZeroPos, PixelZeroPos

Note: in python this is called positionToIndexAndResidual

Return

nearest integer index

std::pair<int, double> positionToIndex(double const pos, bool)

Parameters

  • pos: image position

Convert image position to index (nearest integer and fractional parts)

Return

std::pair(nearest integer index, fractional part)

Variables

const double PixelZeroPos = 0.0

position of center of pixel 0

FITS uses 1.0, SDSS uses 0.5, LSST uses 0.0 (http://dev.lsstcorp.org/trac/wiki/BottomLeftPixelProposalII%3A)