[26cac0]: / doc / generatekeys.txt  Maximize  Restore  History

Download this file

56 lines (41 with data), 2.4 kB

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
GENERATEKEYS(1) User Manual GENERATEKEYS(1)
NAME
generatekeys - Generate SIFT keypoints from an image file
SYNOPSIS
generatekeys.exe imagefile keyfile[.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
SIFT descriptors to the keyfile. The image is internally doubled in
size, as this increases the number of keypoints found. If you do not
want this behaviour or want to downscale the picture, see the down-
scaleResolution option. The resulting keyfiles can be processed by the
other utilities in the autopano-sift package.
OPTIONS
imagefile
The image file name that will be read in and processed. It can
be in any format readable by the GDK pixbuf loaders. Usually
that includes JPEG, PNG and TIFF.
keyfile
The name of the keypoint XML file to generate. When ".gz" is
used at the end of the filename, the file is transparently com-
pressed using the gzip compression. See gzip(1)
downscaleResolution
An optional integer width and height limitation. If given, the
input image is downscaled so its larger dimension matches the
given size in pixels. The smaller the downscale resolution, the
smaller the memory requirements, but also less keypoints are
found. In case no downscale resolution is given, the image is
doubled in size prior to processing, which leads to substantly
more keypoints. If you use 0 as downscaleResolution you can
switch this behaviour off and the original image is used without
applying any scaling.
BUGS
The memory requirements are quite big. If you have 256Mb of ram, you
should go with 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>
SEE ALSO
autopano-complete(1), autopano(1), autopanog(1), showone(1), showtwo(1)
autopano-sift MAY 2004 GENERATEKEYS(1)