Re: Image Processing
- To: mathgroup at smc.vnet.net
- Subject: [mg66080] Re: [mg66055] Image Processing
- From: "Carl K. Woll" <carlw at wolfram.com>
- Date: Sat, 29 Apr 2006 03:40:09 -0400 (EDT)
- References: <200604281032.GAA03084@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Charlie Springer wrote: > Hi all. > > Old physicist, new Mathematica user. > > I want to perform 2D FFT's on images. I have used Import to get a JPEG into > apparently, a graphic object. I can not see how to get it into a "list of > lists" or any form acceptable to Fourier[]. > > Anybody have a snippet or some experience? I'm still learning the > terminology. If this works out I'll get the grid version for a Mac Quad. > > -- Charlie Springer Import of JPEG's yields graphics objects of the structure: Graphics[ Raster[data], opts ] If you import your jpeg using Import: jpeg = Import["picture", "JPEG"]; Then you can extract the raster data structure using raster = jpeg[[1]] Look up Raster in the help browser to see how a Raster object is structured. Basically, the first element of the raster is your 2D array of cells. Carl Woll Wolfram Research
- References:
- Image Processing
- From: Charlie Springer <RAM@regnirps.com>
- Image Processing