Is it possible to change numLabels manually when using labelvolshow?

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Wu Yu-Wei
Wu Yu-Wei 2021-8-22
评论： Wu Yu-Wei 2021-9-7
Hi,
I adopted labelvolshow into custom function to show 3D time series data, but encountered a problem about colormap.
My data are these size
V = 483x496x5 double;
multiple same size and class Ln = 483x496x5 uint16;
the values in a L are given according to appearance time,
this makes my total numLabels is more than 2000 but only some of them in the same L.
(e.g: L346 is 483x496x5 uint16, the values for (x= 163:224, y= 120:189, z= 2:3) is 1966 )
The documentation said LabelColor accept numLabels-by-3, where numLabels represents the number of labels in the labeled volume
but I still give it a try
cmap = colormap(jet(numLabels));
hImage=labelvolshow(L, V,'Parent',P1, ...
'BackgroundColor',backgroundcolor, 'ScaleFactors', scalefact,...
'VolumeOpacity', volopacity, 'VolumeThreshold', volthreshold, 'LabelColor',cmap);
as expected, I got error message:
Error using labelvolshow
Expected LabelColor to be of size 8x3, but it is of size 2806x3.
So I want to know is there any suggestion/solution for my purpose?
  1 个评论
Wu Yu-Wei
Wu Yu-Wei 2021-9-6
编辑：Wu Yu-Wei 2021-9-6
I found myself not so clear in the original post that
I forgot to mention the shape of one label might change but the ID remains the same before disappearing.
So I don't want the colour for same labels change and I want different IDs with different colours in a short time period.
e.g: the orange, red and purple labels exist around t18 -> t19 -> tn
The biggest problem is the ID easily exceed the limit of colours for labelvolshow (recently I found it is 128) after t30.
All the labels become same colour.
I guess reusing colours is ok as long as these different labels can be distinguished by time
But I'm not sure how to do it.
Thanks

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回答（1 个）

Walter Roberson
Walter Roberson 2021-8-22
编辑：Walter Roberson 2021-8-22
background_label = 0;
cmap = colormap(jet(numLabels));
%then for any particular L, V:
usedL = setdiff(unique(L), background_label);
hImage=labelvolshow(L, V,'Parent',P1, ...
'BackgroundColor',backgroundcolor, 'ScaleFactors', scalefact,...
'VolumeOpacity', volopacity, 'VolumeThreshold', volthreshold, 'LabelColor',cmap(usedL,:));
This assumes that there is a background label 0 that is to be ignored.
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Wu Yu-Wei
Wu Yu-Wei 2021-9-7
Dear Walter,
Thanks for your answer,
It seems the labelvolshow uses the real value in the L array.
e.g, 36th L array (which is also t36), there are 10 labels and their IDs are in the pic.
Although the cmap is set for 10 elements.
cmap = colormap(jet(numel(usedL)))
But the real value in L array exceed the limit of colours for labelvolshow (recently I found it is 128) and all labels become same colour.
Wu Yu-Wei
Wu Yu-Wei 2021-9-7
By the way,
The volumeViewer cannot set different colours.
Even when I want to manually set colour for individual label, they change together.
I'll suggest MATHWORKS to improve 3D view

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