AUTOREG

Description

The automatic registration function, given a reference image and a second input image (target image), applies a filtering and correlation process to determine the best affine transformation for registering the input image to the reference image.

Parameters

Name	Type	Length	Value range
InputRef: Input reference channel	Raster port	0 - 1	Default: 1
InputIma: Input image channel	Raster port	0 - 1	Default: 1
OutputGCP: Output GCP segment *	GCP port	1 -
Whitening Chunk Size	Integer	0 - 1	8 - 32 Default: 32
Correclation Grid X Offset	Integer	0 - 1	32 - Default: 128
Correlation Grid Y Offset	Integer	0 - 1	32 - Default: 128
Correlation Patch Size	Integer	0 - 1	0 - Default: 16
Correlation Search Window	Integer	0 - 1	0 - Default: 32
False Alarm Probability	Float	0 - 1	0 - Default: 0.10
Isolated Noise Factor	Float	0 - 1	0 - Default: 0.10
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

InputRef: Input reference channel

Specifies the image channel that contains the reference image.

InputIma: Input image channel

Specifies the image channel that contains the image to be registered.

OutputGCP: Output GCP segment

Specifies the output GCP segment to receive the registered image output.

Whitening Chunk Size

Specifies the size of the chunk of data used to whiten (edge enhance) the reference image and the image to be registered. This value must be a power of 2, and 32 or less. Normally a value 32 is best. A value of 16 will increase processing speed, but at the cost of accuracy.

Correclation Grid X Offset

Specifies the correlation grid X offset. This offset is used to ensure that no edge effects are included in the whitening or correlation of the data. The correlation grid X offset must be greater than or equal to half of the search size.

Correlation Grid Y Offset

Specifies the correlation grid Y offset. This offset is used to ensure that no edge effects are included in the whitening or the correlation of the data. The correlation grid Y offset must be greater than or equal to half of the search size.

Correlation Patch Size

Specifies the correlation patch size, that is, the size of the image chip for cross-correlation.

Correlation Search Window

Specifies extent of the correlation search range which is the expected mis-registration. The search size must be greater than or equal to the correlation patch size.

False Alarm Probability

Specifies the probability of false alarm. Decreasing this parameter removes control points that are not likely to be due to image structure.

Isolated Noise Factor

Specifies the isolated noise factor. This parameter is not normally set by the user.

Report

Specifies where to direct the generated report.

Available options are:

• LOG: generates a report on the terminal (default)
• <modulename.RPT>: appends a report to the module's RPT file
• DISK: generates a report on file "IMPRPT.LST"

Details