如何在Matlab上一起旋转图像和轴? [英] How to rotate image and axes together on Matlab?

问题描述

代码1，其中垂直和/或水平翻转不会影响axes()； 代码2中提出的解决方案未产生预期的输出

Code 1 where flipping vertically and/or horizontally does not affect axes(); Code 2 where proposed solution does not yield the expected output

close all; clear all; clc;
x = [5 8];
y = [3 6];
C = [0 2 4 6; 8 10 12 14; 16 18 20 22];
C2 = C(:,end:-1:1,:);           %# horizontal flip
C3 = C(end:-1:1,:,:);           %# vertical flip
C4 = C(end:-1:1,end:-1:1,:);    %# horizontal+vertical flip

% https://stackoverflow.com/a/4010203/54964
subplot(2,2,1), imagesc(x,y,C)
subplot(2,2,2), imagesc(x,y,C2)
subplot(2,2,3), imagesc(x,y,C3)
subplot(2,2,4), imagesc(x,y,C4)

%% Rotations of axes() unsuccessfully 
% https://stackoverflow.com/a/15071734/54964
figure
subplot(2,2,1), imagesc(x,y,C)
x = linspace(1, size(C, 2), numel(x)); % reverse only x
set(gca, 'XTick', x, 'XTickLabel', x)
subplot(2,2,2), imagesc(x,y,C2)

x = linspace(1, size(C, 2), numel(x)); % reverse back x
set(gca, 'XTick', x, 'XTickLabel', x)  % reverse y
y = linspace(1, size(C, 1), numel(y));
set(gca, 'YTick', y, 'YTickLabel', flipud(y(:)))
subplot(2,2,3), imagesc(x,y,C3)

x = linspace(1, size(C, 2), numel(x)); % now both x,y reversed
set(gca, 'XTick', x, 'XTickLabel', x)
subplot(2,2,4), imagesc(x,y,C4)

图. 1输出，其中轴保持不变，但图像正确翻转， 图2尝试移动xticks/yticks

Fig. 1 Output where axis stay untouched but images are flipped correctly, Fig. 2 Output from attempt with moving xticks/yticks

预期输出:

• 图1(左上)全部在带有图的轴上
• 图2(右上)的y轴正确，但x轴从8到5
• 图3(左下)的y轴从6变为3，但x轴正确
• 图4(右下)的y轴正确，但x轴从3到6.

代码

% 1 start of vector 2 end of vector 3 length of vector 
figure
subplot(2,2,1), imagesc(x,y,C)
x = linspace(size(C, 2), 1, numel(x)); % reverse only x
set(gca, 'XTick', x, 'XTickLabel', x)
subplot(2,2,2), imagesc(x,y,C2)

x = linspace(1, size(C, 2), numel(x)); % reverse back x
set(gca, 'XTick', x, 'XTickLabel', x)  
y = linspace(size(C, 1), 1, numel(y)); % reverse y
set(gca, 'YTick', y, 'YTickLabel', flipud(y(:)))
subplot(2,2,3), imagesc(x,y,C3)

x = linspace(size(C, 2), 1, numel(x)); % now both x,y reversed
set(gca, 'XTick', x, 'XTickLabel', x)
y = linspace(1, size(C, 1), numel(y)); % reverse y
set(gca, 'YTick', y, 'YTickLabel', flipud(y(:)))
subplot(2,2,4), imagesc(x,y,C4)

输出

Error using matlab.graphics.axis.Axes/set
While setting the 'XTick' property of 'Axes':
Value must be a vector of type single or double whose values increase

Error in test_imagesc_subplot_figure (line 26)
set(gca, 'XTick', x, 'XTickLabel', x)

Eskapp的提议

我未成功完成以下操作，但未对图2进行任何更改；第一行数字按xaxis的升序排列；我也尝试了reverse-normal

Eskapp's proposal

I do unsuccessfully the following but no change on Fig. 2; the first row of figures stay in the same increasing order of xaxis; I also tried instead of reverse - normal

figure
subplot(2,2,1), imagesc(x,y,C)
x = linspace(1, size(C, 2), numel(x)); % reverse only x
set(gca,'xdir','reverse')
subplot(2,2,2), imagesc(x,y,C2)

• 图1和图2 axis的输出保持不变

  • Output of Fig. 1 and Fig. 2 axis stay the same

    将set(gca,'XTick',x,'XTickLabel',x, 'YTick',y,'YTickLabel',fliplr(y))与变量y=linspace(0,180,181); x=0:0.5:10

    Matlab:2016a
    操作系统:Debian 8.5 64位
    硬件:华硕Zenbook UX303UA

    Matlab: 2016a
    OS: Debian 8.5 64 bit
    Hardware: Asus Zenbook UX303UA

    推荐答案

    如果我正确理解了您的问题，那么这段代码将满足您的要求:

    If I correctly understand your question, then this code does what you look for:

    x = 5:8;
    y = 3:6;
    C = reshape(0:2:22,4,3).';
    C2 = fliplr(C); % horizontal flip
    C3 = flipud(C); % vertical flip
    C4 = rot90(C,2); % horizontal+vertical flip
    
    % the answer starts here:
    subplot(2,2,1), imagesc(x,y,C)
    set(gca,'XTick',x,'XTickLabel',x,...
         'YTick',y,'YTickLabel',y)
    subplot(2,2,2), imagesc(x,y,C2)
    set(gca,'XTick',x,'XTickLabel',fliplr(x),...
         'YTick',y,'YTickLabel',y)
    subplot(2,2,3), imagesc(x,y,C3)
    set(gca,'XTick',x,'XTickLabel',x,...
         'YTick',y,'YTickLabel',fliplr(y))
    subplot(2,2,4), imagesc(x,y,C4)
    set(gca,'XTick',x,'XTickLabel',fliplr(x),...
         'YTick',y,'YTickLabel',fliplr(y))
    

    结果:

    我从2元素向量中更改了x和y，但在以下情况下也可以使用

    I changed you x and y from 2-element vectors, but it works also if:

    x = [5 8];
    y = [3 6];
    

    顺便说一句...

    代替操纵C并创建C2 ... C4，您只需编写:

    Instead of manipulating C and create C2...C4, you can just write:

    subplot 221, imagesc(x,y,C)
    subplot 222, imagesc(fliplr(x),y,C)
    subplot 223, imagesc(x,fliplr(y),C)
    subplot 224, imagesc(fliplr(x),fliplr(y),C)
    

    并像以前一样在每次调用subplot之后在轴上添加操作.

    and add the manipulation on the axis after each call to subplot like before.

    修改:

    使用向量的大小和限制:

    Using your sizes and limits of the vectors:

    x = linspace(0,10,6);
    y = linspace(0,180,19); % no need to plot each label
    N = 3613;
    C = diag(1:N)*ones(N)+rot90(diag(1:N)*ones(N)); % some arbitrary matrix 
    

    上面所有其余代码都相同的地方，我得到以下结果:

    where all the rest of the code above remains the same, I get the following result:

    这篇关于如何在Matlab上一起旋转图像和轴?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！