home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
swCHIP 1991 January
/
swCHIP_95-1.bin
/
demo
/
wit4711
/
lib
/
help
/
xform
/
dct.
/
dct.bin
Wrap
Text File
|
1995-12-09
|
814b
|
17 lines
OPERATOR
dct --- compute discrete cosine transform of an image
DESCRIPTION
The dct operator computes the discrete cosine transform of the input image. A
forward or inverse cosine is specified by the dir parameter. 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.