Package skyview.process.deedger
Class BoundaryAverage
- java.lang.Object
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- skyview.process.deedger.BoundaryAverage
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- All Implemented Interfaces:
Serializable
,Component
,Processor
public class BoundaryAverage extends Object implements Processor
This class adjusts the 0 point for data taken from multiple images to try to minize edge effects. The alogithm used in this version is as follows:- Find all of the 'edge' pixels in the image
and compute the jump over the edge.
- We determine the edge pixels by looking at the source images of pixels which differ by one in the x or y dimension. We sweep in both directions
- The jump is simply the change in value between the two pixels.
- Add the jump at each edge pixel to the any previous jumps for these two source images. When we finish we have a matrix of the total deltas along the edges shared by each pair of images. We compute the delta's in both directions, so that deltas[a][b] = - deltas[b][a] Also keep track of the number of edge pixels for each pair of images. [Note that many of the candidate images will not have been used in any pixels in the output image. This will simply correspond to empty rows and columsn in the deltas and counts matrices.]
- Create an offset array with a NaN offset for each input image.
- Find the source image which has the maximum number of pixels in the output image. Make this the base image with an offset of 0.
- Consider the source images in two sets: the set for which an offset has been defined, and a set for which it has not. Initially only the base image is in the first set and all others are in the undefined set.
- Find the largest entry in the counts matrix where the row corresponds to an image with a defined offset, and the column corresponds to an image with an undefined offset.
- Assign an offset to the image associcated with the column such that the total delta along the edge should become 0. Remember that the defined image will change too.
- Iterate until all images have an offset defined.
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description BoundaryAverage()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description String
getDescription()
Get a description of this objectString
getName()
Get a name for this objectvoid
process(Image[] inputs, Image output, int[] source, Sampler samp, DepthSampler dsamp)
Initialized the de-edger.void
updateHeader(nom.tam.fits.Header h)
Update a FITS header with the processing done here.
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Method Detail
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getName
public String getName()
Get a name for this object
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getDescription
public String getDescription()
Get a description of this object- Specified by:
getDescription
in interfaceComponent
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process
public void process(Image[] inputs, Image output, int[] source, Sampler samp, DepthSampler dsamp)
Initialized the de-edger.
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updateHeader
public void updateHeader(nom.tam.fits.Header h)
Update a FITS header with the processing done here.- Specified by:
updateHeader
in interfaceProcessor
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