删除切片中的小值 [英] Removing small values in slice

问题描述

如何删除切片图中的小值?在我的情节中，基本上蓝色太多，我看不到里面的红点.

How can I delete the small values in a slice plot? In my plot, there is basically too much blue and I cannot see the red points inside.

或者，稍微不同:

*是否可以用 matlab 删除切片图中的一些点?

*Is it possible delete some points in a slice plot with matlab?

slice(X,Y,Z,V,sx,sy,sz) 表示由 sx,sy 和 sz 定义的整个平面上体积 V 的值.但是我可以选择只保留这些计划中的一些点吗?

slice(X,Y,Z,V,sx,sy,sz) represents the value of the volume V on the whole plans defined by sx,sy and sz. But can I choose to keep some points of these plans only?

• 我们是否必须在整个计划中表示 V 的值?

• Do we have to represent the values of V on the whole plan?

我可以让小价值"透明吗?

Can I make "small values" transparent?

编辑新代码:

h =slice(x,y,z,V,sx,sy,sz);
for n=1:length(h)
    set(h(n), 'alphadata',get(h(n),'cdata'), 'facealpha','flat');   
end
a = alphamap('rampup',256);
a(a<(threshold)) = 0;
a(a>(threshold)) = 0.07;
alphamap(a);

我尝试了上面的代码.然而，这是我得到的情节:我认为 cdata(颜色)有问题，但我不知道这是什么...

I tried with the code above. However, this is the plot I am getting: I think there is a problem with cdata (the colors) but I can't figure out what this is...

推荐答案

您可以调整透明度，使较低的值更加透明.首先，您需要切片的句柄:

You can adjust the transparency so lower values are more transparent. First, you need the handles to your slices:

h = slice(X,Y,Z,V,sx,sy,sz);

h 不是单个句柄，而是不同切片的一系列句柄.对于任何一个手柄，您都可以更改透明度(或循环所有 n 以更改它们):

h is not a single handle but a series of handles to the different slices. For any one handle you can change the transparency (or loop around for all n to change them all):

set(h(n),'alphadata',get(h(n),'cdata'),'facealpha','flat');

alphadata 是透明度的数据 - 默认情况下这是1"(不透明)，因此对于每个句柄，您可以将其设置为 cdata 的内容.AlphaDataMapping 应该已经默认设置为 scaled - 所以 alphadata 中的值被映射到一个 alphamap，就像 cdata 值映射到您的颜色图(稍后会详细介绍).

alphadata is the data for transparency - by default this is "1" (opaque), so instead for each handle you can set it to the contents of cdata. AlphaDataMapping should already be set to scaled by default - so the values in alphadata are mapped to an alphamap, just as cdata values are mapped to your colormap (more on that later).

facealpha 是如何将 alphadata 应用于对象面部的设置 - 需要更改以便实际使用 alphadata 中的值.

facealpha is a setting for how the alphadata is applied to the faces of an object - needs to be changed so that the values in alphadata are actually used.

如果您想调整透明值的透明度或透明值，您可以更改 alphamap.默认地图只是线性的，可以通过 plot(get(gcf,'Alphamap')) 看到，其中 0 = 不可见，1 = 不透明.地图的长度可能会有所不同，因此您有很大的调整自由度 - 例如，如果您对这些值不感兴趣，您可以将下部完全归零:

If you want to adjust how transparent values are or which are transparent, you can change the alphamap. The default map is just linear and can be seen by plot(get(gcf,'Alphamap')), where is 0 = invisible and 1 = opaque. The length of the map can vary so you have a lot of freedom in adjusting it - for example you can completely zero out the lower part if you're not interested in those values:

a = alphamap('rampup',256);
a(1:80)=0;
alphamap(a); % only changes alphamap of current figure

在 此处.

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