improfile() - Image Processing

improfile retrieves the intensity values
of pixels along a line or a multiline path in the grayscale, binary,
or RGB image in the current axes and displays a plot of the intensity
values. If the specified path consists of a single line segment, improfile creates
a two-dimensional plot of intensity values versus the distance along
the line segment. If the path consists of two or more line segments, improfile creates
a three-dimensional plot of the intensity values versus their x-
and y-coordinates.With this syntax, you specify the line or path using the mouse,
by clicking points in the image. Press Backspace or Delete to
remove the previously selected point. To finish selecting points,
adding a final point, press shift-click, right-click, or double-click.
To finish selecting points without adding a final point, press Return.improfile(n) retrieves the intensity values,
where n specifies the number of points to include.
If you do not provide this argument, improfile chooses
a value for n, roughly equal to the number of pixels
the path traverses.improfile(I,xi,yi) retrieves pixel intensity
values, where I specifies an image, and xi and yi are
equal-length vectors specifying the spatial coordinates of the endpoints
of the line segments.improfile(I,xi,yi,n) returns pixel intensity
values, where n specifies the number of points
to include.c = improfile(___) returns
the intensity values in c, an n-by-1
vector, if the input is a grayscale intensity image, or an n-by-1-by-3
array if the input is an RGB image.[cx,cy,c] = improfile(I,xi,yi,n) additionally
returns the spatial coordinates of the pixels, cx and cy,
of length n.[cx,cy,c,xi,yi] = improfile(I,xi,yi,n) additionally
returns two equal-length vectors specifying the spatial coordinates
of the endpoints of the line segments. xi and yi.[___] = improfile(x,y,I,xi,yi) enables
the definition of a nondefault spatial coordinate system by specifying
two, 2-element vector, x and y,
containing the image XData and YData.[___] = improfile(x,y,I,xi,yi,n) defines
a nondefault spatial coordinate system and specifies the number of
points to include, n.[___] = improfile(___,method) specifies
the interpolation method:'nearest' — Nearest-neighbor
interpolation (the default)'bilinear' — Bilinear interpolation'bicubic' — Bicubic interpolation

Syntax

improfileimprofile(n)improfile(I,xi,yi)improfile(I,xi,yi,n)c = improfile(___)[cx,cy,c] = improfile(I,xi,yi,n)[cx,cy,c,xi,yi] = improfile(I,xi,yi,n)[___] = improfile(x,y,I,xi,yi)[___] = improfile(x,y,I,xi,yi,n)[___] = improfile(___,method)

Example

Read image.

Output / Return Value

Limitations

Alternatives / See Also

Reference