MAN page from PLD autopano-sift-C-2.5.1-1.i486.rpm

GENERATEKEYS

Section: User Manual (1)
Updated: MAY 2004
Index

NAME

generatekeys - Generate SIFT keypoints from an image file

SYNOPSIS

generatekeys.exeimagefilekeyfile[.gz][downscaleResolution]

DESCRIPTION

Generate SIFT key descriptors for an image. It reads in the image file,finds SIFT keypoints for descriptive image locations and outputs the SIFTdescriptors to the keyfile. The image is internally doubled in size, as thisincreases the number of keypoints found. If you do not want this behaviour orwant to downscale the picture, see the downscaleResolution option. Theresulting keyfiles can be processed by the other utilities in theautopano-sift package.

OPTIONS

imagefile: The image file name that will be read in and processed. It can be in anyformat readable by the GDK pixbuf loaders. Usually that includes JPEG, PNG andTIFF.
keyfile: The name of the keypoint XML file to generate. When ".gz" is used at the endof the filename, the file is transparently compressed using the gzipcompression. Seegzip(1)
downscaleResolution: An optional integer width and height limitation. If given, the input image isdownscaled so its larger dimension matches the given size in pixels.The smaller the downscale resolution, the smaller the memoryrequirements, but also less keypoints are found. In case no downscaleresolution is given, the image is doubled in size prior to processing, whichleads to substantly more keypoints. If you use 0 as downscaleResolution youcan switch this behaviour off and the original image is used without applyingany scaling.

BUGS

The memory requirements are quite big. If you have 256Mb of ram, you should gowith a 700 downscale resolution, if you have 512Mb 1300 is a good value.

AUTHOR

Sebastian Nowozin <nowozin at cs dot tu dash berlin dot de>

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