在3D圖像集中畫一條線

Question

換句話說，每條圖像上應該出現同一條線。我使用imshow3D函數預覽我的圖像。

Answer 1

這裏有一個方法可以不用imshow3D（只需用下面的函數創建一個新的.m文件）。我認爲你會更容易理解代碼背後發生了什麼。

訣竅是在回調中添加一個按鈕和功能imline以便以交互方式劃一條線。然後，當用戶滾動堆棧時，我們使用函數line實際繪製一條使用先前繪製線的位置的線。

我使用了隨Matlab一起提供的mri數據，但是這些數據應該適用於您的數據/ dicom圖像/無論如何。

代碼：

function ScrollMRI(~) 
clc 
clear 
close all 

%// Load demo data 
S = load('mri'); 

%// Get dimensions and number of slices. 
ImageHeight = S.siz(1); %// Not used here 
ImageWidth = S.siz(2); %// Not used here 
NumSlices = S.siz(3); 

S.D = squeeze(S.D); 

%// Create GUI 
hFig = figure('Position',[100 100 400 400],'Units','normalized'); 

%// create axes with handle 
handles.axes1 = axes('Position', [0.2 0.2 0.6 0.6]); 

%// create y slider with handle 
handles.y_slider = uicontrol('style', 'Slider', 'Min', 1, 'Max', NumSlices, 'Value',1, 'Units','normalized','position', [0.08 0.2 0.08 0.6], 'callback', @(s,e) UpdateY); 
handles.SlideryListener = addlistener(handles.y_slider,'Value','PostSet',@(s,e) YListenerCallBack); 

%// Create pusbutton to draw line 
handles.DrawLineButton= uicontrol('style', 'push','position', [40 40 100 30],'String','Draw line', 'callback', @(s,e) DrawLine); 

%// Flag to know whether pushbutton has been pushed 
handles.LineDrawn = false; 

%// Show 1st slice 
imshow(S.D(:,:,1)) 

guidata(hFig,handles); 

%// Listeners callbacks followed by sliders callbacks. Used to display each 
%// slice smoothly. 
    function YListenerCallBack 

     handles = guidata(hFig); 

     %// Get current slice 
     CurrentSlice = round(get(handles.y_slider,'value')); 

     hold on 
     imshow(S.D(:,:,CurrentSlice)); 

     %// If button was button, draw line 
     if handles.LineDrawn 
      line([handles.LinePos(1,1) handles.LinePos(2,1)],[handles.LinePos(1,2) handles.LinePos(2,2)],'LineWidth',2,'Color','y'); 
     end 
     drawnow 

     guidata(hFig,handles); 

    end 

    function UpdateY(~) 

     handles = guidata(hFig); %// Get handles. 
     CurrentSlice = round(get(handles.y_slider,'value')); 

     hold on 
     imshow(S.D(:,:,CurrentSlice)); 

     if handles.LineDrawn 
      line([handles.LinePos(1,1) handles.LinePos(2,1)],[handles.LinePos(1,2) handles.LinePos(2,2)],'LineWidth',2,'Color','y'); 
     end 
     drawnow 

     guidata(hFig,handles); 

    end 

%// Pushbutton callback to draw line. 
    function DrawLine(~) 
     handles = guidata(hFig); %// Get handles. 

     hLine = imline(gca); 

     %// Get position of line and store it in handles structure. 
     handles.LinePos = hLine.getPosition(); %// handles.LinePos is a 2-by-2 array [X1 Y1; X2 Y2] 

     %// Set tag to true. 
     handles.LineDrawn = true; 
     guidata(hFig,handles); 
    end 

end 

這裏是GUI的屏幕截圖按下按鈕之前：

，然後按下它和畫線之後：

T當你在堆棧中滾動時，他的線保持在相同的位置。

希望能幫助你開始！