decreased offset correction More...

#include <pixel_detectors.h>

Inheritance diagram for cass::pp241:

Collaboration diagram for cass::pp241:

Public Member Functions
	pp241 (const name_t &)
	constructor More...

virtual void	process (const CASSEvent &, result_t &)
	process event More...

virtual void	loadSettings (size_t)
	load the settings More...

Public Member Functions inherited from cass::Processor
	Processor (const name_t &name)
	constructor More...

virtual	~Processor ()
	virtual destructor More...

virtual void	processEvent (const CASSEvent &event)
	process the event More...

virtual const result_t &	result (const CASSEvent::id_t eventid=0)
	retrieve a result for a given id. More...

virtual void	releaseEvent (const CASSEvent &event)
	tell the list that the result for event can be overwritten More...

result_t::shared_pointer	resultCopy (const uint64_t eventid)
	retrieve histogram for id More...

virtual void	load ()
	load the general settings More...

virtual void	aboutToQuit ()
	function that will be called when the processor is about to be deleted More...

const names_t &	dependencies ()
	Define all processors keys a processor depends on. More...

void	clearDependencies ()
	clear the dependenies More...

void	clearHistograms ()
	clear the histograms More...

virtual void	processCommand (std::string command)
	process command in pp More...

const name_t	name () const
	retrieve the name of this processor More...

bool	hide () const
	retrieve the hide flag of this processor More...

const std::string &	comment () const
	retrieve the comment of this processor More...

Protected Attributes
shared_pointer	_hist
	pp containing 2d histogram to work on More...

float	_thresholdA
	threshold for quadrant A More...

float	_thresholdB
	threshold for quadrant A More...

float	_thresholdC
	threshold for quadrant A More...

float	_thresholdD
	threshold for quadrant A More...

float	_weightAdjectentRow
	the weight of the row next to the current one More...

float	_weightSecondRow
	the weight of the row next over to the current one More...

float	_weightSum
	the value by which one has to divide to get the right average value More...

size_t	_minRow
	the minimum row More...

size_t	_maxRow
	the maximum row More...

Protected Attributes inherited from cass::Processor
const name_t	_name
	the processors name More...

bool	_hide
	flag to tell whether this pp should be hidden in the dropdown list More...

std::string	_comment
	optional comment that one can add to a processor. More...

CachedList	_resultList
	the list of results More...

names_t	_dependencies
	the list of dependencies More...

shared_pointer	_condition
	pointer to the processor that will contain the condition More...

Additional Inherited Members
Public Types inherited from cass::Processor
typedef std::tr1::shared_ptr< Processor >	shared_pointer
	a shared pointer of this More...

typedef std::string	name_t
	define the name type More...

typedef std::list< name_t >	names_t
	define the list of names More...

typedef CachedList::item_type	result_t
	define the results More...

typedef CachedList::item_sp	resultsp_t
	define the shared pointer to the result More...

Protected Member Functions inherited from cass::Processor
virtual void	createHistList (result_t::shared_pointer result)
	create result list. More...

void	setupGeneral ()
	general setup of the processor More...

bool	setupCondition (bool defaultConditionType=true)
	setup the condition. More...

shared_pointer	setupDependency (const std::string &depVarName, const name_t &name="")
	setup the dependecy. More...

Detailed Description

decreased offset correction

Available PostProcessors:: "241" correct the distorted offset in a pnCCD image

modifies the incomming 2d histogram such that a wrong offset du to much charge on the pnCCD detector will be corrected.

The correction is different for each quadrant. Basically one corrects a line with a linear slope. Therefore one determines how much the nominal offset at the edge of the detector has been disturbed. It should not be disturbed at all since these parts are shielded from the light. A distortion will therefore indicate how much these lines have been distorted.

This processor will therefore first determine at the edge of the detector how much the offset has been distorted. Once this is know one can use a correction factor and substract this from the measured value. A pixels correction is therefore done like

determine the averageOffsetAtEdge value and from that determine the slope for the quadrant. Then pixel values are calculated like this:

cor_function_value = slope * column_number - averageOffsetAtEdge; final_corection = pix_raw_val - offset_from_darkcal - cor_function_value;

Because the average offset at the edge of the detector might contain statisics outliers. One can includes the line above and below with less (user selectable) weight. If one chooses 0 weight that line will not be included in the calculation of the determination of the average offset value at the edge.

The average offset at the edge of the first two and the last two rows will only be determined by the current row.

See also: Processor for a list of all commonly available cass.ini settings.

User definable Parameters:

Processor/%name%/{ImageName}
Name of Processor containing the distorted pnCCD image. Default is "".

Processor/%name%/{ThresholdQuadrantA}
Threshold for the rows of quadrant A. If the averaged value is below this value the whole row of this quadrant is changed. Default is 0.

Processor/%name%/{ThresholdQuadrantB}
Threshold for the rows of quadrant B. If the averaged value is below this value the whole row of this quadrant is changed. Default is 0.

Processor/%name%/{ThresholdQuadrantC}
Threshold for the rows of quadrant A. If the averaged value is below this value the whole row of this quadrant is changed. Default is 0.

Processor/%name%/{ThresholdQuadrantD}
Threshold for the rows of quadrant D. If the averaged value is below this value the whole row of this quadrant is changed. Default is 0.

Processor/%name%/{WeightAdjecentRow}
How much will the row that is adjecent to the current row be weightd when calculating the average offset at the edge of the detector. Default is 0.75.

Processor/%name%/{WeightSecondNextRow}
How much will the row that is the next over to the current row be weightd when calculating the average offset at the edge of the detector. Default is 0.5.

Processor/%name%/{MinimumRow}
Define from which row the correction should be applied. Default is 0.

Processor/%name%/{MaximumRow}
Define to which row the correction should be applied. Default is 1024.