Read a 2-D image into the workspace.

I = imread('cameraman.tif');

Create animref2dspatial referencing object associated with the image.

R = imref2d(size(I))

R = imref2d with properties: XWorldLimits: [0.5000 256.5000] YWorldLimits: [0.5000 256.5000] ImageSize: [256 256] PixelExtentInWorldX: 1 PixelExtentInWorldY: 1 ImageExtentInWorldX: 256 ImageExtentInWorldY: 256 XIntrinsicLimits: [0.5000 256.5000] YIntrinsicLimits: [0.5000 256.5000]

Check if certain world coordinates are in the image.

res = contains(R,[5 8 8],[5 10 257])

res =1x3 logical array1 1 0

This result indicates that the points (5,5) and (8,10) are within the image bounds, and that the point (8, 257) is outside the image bounds. This conclusion is consistent with theXWorldLimitsandYWorldLimitsproperties of the spatial referencing objectR。

Read a 3-D image into the workspace. This image consists of 27 frames of 128-by-128 pixel images.

loadmri; D = squeeze(D);

Create animref3dspatial referencing object associated with the image.

R = imref3d(size(D))

R = imref3d with properties: XWorldLimits: [0.5000 128.5000] YWorldLimits: [0.5000 128.5000] ZWorldLimits: [0.5000 27.5000] ImageSize: [128 128 27] PixelExtentInWorldX: 1 PixelExtentInWorldY: 1 PixelExtentInWorldZ: 1 ImageExtentInWorldX: 128 ImageExtentInWorldY: 128 ImageExtentInWorldZ: 27 XIntrinsicLimits: [0.5000 128.5000] YIntrinsicLimits: [0.5000 128.5000] ZIntrinsicLimits: [0.5000 27.5000]

Check if certain 3-D world coordinates are in the image.

res = contains(R,[5 6 6 8],[5 10 10 257],[1 27.5 28 1])

res =1x4 logical array1 1 0 0

This result indicates that the points (5,5,1) and (6,10,27.5) are within the image bounds. The points (6,10,28) and (8,257,1) are outside the image bounds. This conclusion is consistent with theXWorldLimits,YWorldLimits, andZWorldLimitsproperties of the spatial referencing objectR。