Class Gratings

Inheritance
Object
Gratings
Inherited Members
Namespace: TowseyLibrary
Assembly: TowseyLibrary.dll
Syntax
public class Gratings

Fields

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key_END_FRAME

Declaration
public const string key_END_FRAME = "endFrame"
Field Value
Type Description
String
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key_PERIODICITY

Declaration
public const string key_PERIODICITY = "periodicity"
Field Value
Type Description
String
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key_SCORE

Declaration
public const string key_SCORE = "score"
Field Value
Type Description
String
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key_START_FRAME

Declaration
public const string key_START_FRAME = "startFrame"
Field Value
Type Description
String

Methods

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DetectPeriod2Grating(Double[])

Declaration
public static double DetectPeriod2Grating(double[] v)
Parameters
Type Name Description
Double[] v
Returns
Type Description
Double
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ExtractPeriodicEvents(Double[], Double[], Double)

Declaration
public static List<Dictionary<string, double>> ExtractPeriodicEvents(double[] intensity, double[] periodicity, double intensityThreshold)
Parameters
Type Name Description
Double[] intensity
Double[] periodicity
Double intensityThreshold
Returns
Type Description
List<Dictionary<String, Double>>
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GetPeriodicSignal(Int32, Int32)

Declaration
public static double[] GetPeriodicSignal(int cyclePeriod, int numberOfCycles)
Parameters
Type Name Description
Int32 cyclePeriod
Int32 numberOfCycles
Returns
Type Description
Double[]
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MergePeriodicScoreArrays(Double[][], Int32, Int32)

Declaration
public static Tuple<double[], double[]> MergePeriodicScoreArrays(double[][] periodScores, int minPeriod, int maxPeriod)
Parameters
Type Name Description
Double[][] periodScores
Int32 minPeriod
Int32 maxPeriod
Returns
Type Description
Tuple<Double[], Double[]>
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ReduceArray(Double[], Int32, Int32)

Declaration
public static double[] ReduceArray(double[] array, int cyclePeriod, int numberOfCycles)
Parameters
Type Name Description
Double[] array
Int32 cyclePeriod
Int32 numberOfCycles
Returns
Type Description
Double[]
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ScanArrayForGratingPattern(Double[], Int32, Int32, Int32)

Steps through the passed array and and at each step cuts out a segment having length = numberOfCycles * cyclePeriod. Each segment is then reduced to length = numberOfCycles * 2. Then the reduced segment is passed to check for a grating pattern having period = 2 signal samples. Use this method when the array to be scanned will be reduced on the fly.

Declaration
public static double[] ScanArrayForGratingPattern(double[] array, int step, int numberOfCycles, int cyclePeriod)
Parameters
Type Name Description
Double[] array
Int32 step
Int32 numberOfCycles
Int32 cyclePeriod

NB! MUST BE AN EVEN NUMBER!!!.
Returns
Type Description
Double[]
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ScanArrayForGratingPattern(Double[], Int32, Int32, Int32, Int32)

returns the period scores for a range of periods to be found in the passed array.

Declaration
public static double[][] ScanArrayForGratingPattern(double[] array, int minPeriod, int maxPeriod, int numberOfCycles, int step)
Parameters
Type Name Description
Double[] array
Int32 minPeriod
Int32 maxPeriod
Int32 numberOfCycles
Int32 step
Returns
Type Description
Double[][]
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ScanArrayForGridPattern(Double[], Int32, Int32)

Steps through the passed array and checks each segment for a grating pattern having period = 2 signal samples. Use this method when the array to be scanned has already been reduced by some method.

Declaration
public static double[] ScanArrayForGridPattern(double[] array, int step, int segmentLength)
Parameters
Type Name Description
Double[] array
Int32 step
Int32 segmentLength
Returns
Type Description
Double[]
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Test_DetectPeriod2Grating()

Runs a simple test of the DetectPeriod2Grating() method First construct an appropriate vector with alternating high and low values.

Declaration
public static void Test_DetectPeriod2Grating()
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Test_ScanArrayForGridPattern1()

Runs a test of the ScanArrayForGratingPattern() method. First constructs a grating signal, then embeds it in longer noise signal The grating is defined by a period and the number of cycles. The search is repeated many iterations in order to get everage accuracy. Accuracy depends on relative levels of noise gain and signal gain i.e. the SNR.

Declaration
public static void Test_ScanArrayForGridPattern1()

Extension Methods