axes2pix (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

Interactive image contrast and brightness adjustment tool

Syntax

```
pixelx = axes2pix(DIM, XDATA, AXESX)
```

Description

pixelx = axes2pix(DIM, XDATA, AXESX) converts an axes coordinate into a pixel coordinate. For example if pt = get(gca,'CurrentPoint') then AXESX could be pt(1,1) or pt(1,2). AXESX must be in pixel coordinates. XDATA is a two-element vector returned by get(image_handle, 'XData') or get(image_handle,'YData'). DIM is the number of image columns for the x coordinate, or the number of image rows for the y coordinate.

Class Support

DIM, XDATA, and AXESX can be double. The output is double.

Note

axes2pix performs minimal checking on the validity of AXESX, DIM, or XDATA. For example, axes2pix returns a negative coordinate if AXESX is less than XDATA(1). The function calling axes2pix bears responsibility for error checking.

Examples

Example with default XData and YData.

h = imshow('pout.tif');
[nrows,ncols] = size(get(h,'CData'));
xdata = get(h,'XData')
ydata = get(h,'YData')
px = axes2pix(ncols,xdata,30)
py = axes2pix(nrows,ydata,30)

Example with non-default XData and YData.

xdata = [10 100]
ydata = [20 90]
px = axes2pix(ncols,xdata,30)
py = axes2pix(nrows,ydata,30)

See Also

impixelinfo, bwselect, imfill, impixel, improfile, pixval, roipoly

applylut bestblk