Thread Subject: Image pixel placement

Hi there,

Quoting the image help page:
IMAGE(X,Y,C), where X and Y are vectors, specifies the
locations of the pixel centers of C(1,1) and C(M,N). Element
C(1,1) is centered over (X(1), Y(1)), element C(M,N) is
centered over (X(end), Y(end)), and the pixel centers of the
remaining elements of C are spread out evenly between those
two points, so that the rectilinear patches are all of equal
width and height.

Is it possible to *not* have rectilinear patches? Ie, I
want the placement of the pixel centers of C(i,j) to be
given by Y(i), X(j), rather than being spaced *linearly*
between the axis limits. This is basically to display an
image with a variable resolution over its Y-axis.

Is this at all possible? Is there a simple method?

Cheers,
Sven.

In article <fodqfd$bok$1@fred.mathworks.com>,
Sven <sven.holcombe@removethis.gmail.com> wrote:

>IMAGE(X,Y,C), where X and Y are vectors, specifies the
>locations of the pixel centers of C(1,1) and C(M,N).
[as rectilinear patches]

>Is it possible to *not* have rectilinear patches? Ie, I
>want the placement of the pixel centers of C(i,j) to be
>given by Y(i), X(j), rather than being spaced *linearly*
>between the axis limits. This is basically to display an
>image with a variable resolution over its Y-axis.

>Is this at all possible? Is there a simple method?

Not with image(). What you can do is use patch() for each
pixel, drawing the box yourself.
--
   "I was very young in those days, but I was also rather dim."
   -- Christopher Priest

> >IMAGE(X,Y,C), where X and Y are vectors, specifies the
> >locations of the pixel centers of C(1,1) and C(M,N).
> [as rectilinear patches]
>
> >Is it possible to *not* have rectilinear patches? Ie, I
> >want the placement of the pixel centers of C(i,j) to be
> >given by Y(i), X(j), rather than being spaced *linearly*
> >between the axis limits. This is basically to display an
> >image with a variable resolution over its Y-axis.
>
> >Is this at all possible? Is there a simple method?
>
> Not with image(). What you can do is use patch() for each
> pixel, drawing the box yourself.

Thanks for the input Walter.

Just for anyone with a similar problem, the uimage()
function on the file exchange solved my problem quite
elegantly. It actually resamples non-rectilinear pixels in
an image() call so that the resulting image comes out *as
if* the pixel locations were correct.

Cheers,
Sven.