How to set title for matlab.gra​phics.prim​itive.Imag​e ?

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Wi Iy
Wi Iy 2019-12-1
回答： Steven Lord 2019-12-1
How do I set title for `matlab.graphics.primitive.Image`?
K>>h =
Image with properties:
CData: [1024×1530 double]
CDataMapping: 'scaled'
Show all properties
h =
Image with properties:
CData: [1024×1530 double]
CDataMapping: 'scaled'
Show all properties
AlphaData: 1
AlphaDataMapping: 'none'
BeingDeleted: 'off'
BusyAction: 'cancel'
ButtonDownFcn: ''
CData: [1024×1530 double]
CDataMapping: 'scaled'
Children: [0×0 GraphicsPlaceholder]
Clipping: 'on'
CreateFcn: ''
DeleteFcn: ''
HandleVisibility: 'on'
HitTest: 'on'
Interruptible: 'off'
Parent: [1×1 Axes]
PickableParts: 'visible'
Selected: 'off'
SelectionHighlight: 'on'
Tag: ''
Type: 'image'
UIContextMenu: [0×0 GraphicsPlaceholder]
UserData: []
Visible: 'on'
XData: [1 1530]
YData: [1 1024]
K>> gca
ans =
Axes (Why no name) with properties:
XLim: [0.5000 1.5305e+03]
YLim: [0.5000 1.0245e+03]
XScale: 'linear'
YScale: 'linear'
GridLineStyle: '-'
Position: [0 0 1.0000 1]
Units: 'normalized'
Show all properties
K>> set(gca, 'String', 'Why no title')
Error using matlab.graphics.axis.Axes/set
There is no String property on the Axes class.

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采纳的回答

Wi Iy
Wi Iy 2019-12-1
编辑：Wi Iy 2019-12-1
I solved it. It turns out that I create the figure with
h = imshow(newImg, 'Border', 'tight');
Trying to set the title won't work, so I need to remove the `Border` option.

更多回答（1 个）

Steven Lord
Steven Lord 2019-12-1
image objects don't have either a String or a Title property. The axes in which image objects are contained don't have a String property either, but you can give them a title using the title function.
To ensure you're adding the title on the correct axes use ancestor on the image handle.
h = image(magic(16));
ax = ancestor(h, 'axes');
title(ax, 'title for magic image')

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