home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
swCHIP 1991 January
/
swCHIP_95-1.bin
/
demo
/
wit4711
/
lib
/
help
/
xform
/
fht.
/
fht.bin
Wrap
Text File
|
1995-12-09
|
904b
|
18 lines
OPERATOR
fht --- fast Hadamard transform an image
DESCRIPTION
The fht operator computes the Fast Hadamard transform of the input image. A
forward or inverse FHT is specified by the dir parameter. A forward FHT
expects either an integer or float input image. The inverse output is always
a float image. During a forward transform, this operator generates two
outputs. The top output is the result image. This image will be adjusted in
size to be a power of 2. The bottom output is a Graphic object describing a
rectangle used to recover the original image after a reverse transform. During
a reverse transform, only the top output is generated. The output will be
the original image changed by the be power of 2 size. The original size is
restored by using the extract operator in conjunction with the Graphic object
produced during the forward transform.