Re: 'rgb2gray' undefined

[Nathan Armer]

Yes, that worked, but now I'm getting "imfilter: first input argument must be 
an image":

octave:1> im1=imread('01.jpg');
warning: your version of GraphicsMagick limits images to 16 bits per pixel
octave:2> im2=imread('02.jpg');
octave:3> uv=estimate_flow_interface(im1,im2);
error: imfilter: first input argument must be an image
error: called from:
error:   C:\Octave3.6.1_gcc4.6.2\share\octave\3.6.1\m\image\imfilter.m at line 6
7, column 5
error:   C:\Octave3.6.1_gcc4.6.2\share\octave\3.6.1\m\flow_code\utils\compute_im
age_pyramid.m at line 46, column 5
error:   C:address@hidden
cal_flow\compute_flow.m at line 93, column 21
error:   C:\Octave3.6.1_gcc4.6.2\share\octave\3.6.1\m\flow_code\estimate_flow_in
terface.m at line 90, column 5
octave:3>

The images are the first and second frames from the MIT test sequence "table": 
http://people.csail.mit.edu/celiu/motionAnnotation/database/table.zip

--- On Wed, 5/16/12, marco atzeri <address@hidden> wrote:

> From: marco atzeri <address@hidden>
> Subject: Re: 'rgb2gray' undefined
> To: address@hidden
> Date: Wednesday, May 16, 2012, 3:28 PM
> On 5/16/2012 10:23 PM, 4evrplan
> wrote:
> > I'm completely new to Octive (and MATLAB, FREEMAT,
> etc.).  Everything seems
> > to work, except that I get an error when I try to use
> rgb2gray:
> >
> > octave:1>  im1=imread('test.jpg');
> > warning: your version of GraphicsMagick limits images
> to 16 bits per pixel
> > octave:2>  tmp1 = uint8(im1);
> > octave:3>  tmp2 = rgb2gray(tmp1);
> > error: `rgb2gray' undefined near line 3 column 8
> > octave:3>
> >
> > So, I tried FreeMat and got a similar error.  I'm
> using Octave3.6.1_gcc4.6.2
> > in Windows 7 64 bit.  I tried running it as an
> Admin, and it made no
> > difference.
> >
> 
> 
> rgb2gray is part of the image package
>    http://octave.sourceforge.net/image/function/rgb2gray.html
> not of octave core
> 
> try "pkg list" and "pkg load image"
> 
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