1、第一步首先百度文库：magnify matlab源程序；找到对应的代码。
2、找到代码之后，我们将里面的源程序代码，复制到matlab新建的m文件。注意文件名为：magnify备注：本经验的最后也给出了matlab m文件代码。直接复制即可。
3、自己用matlab画一个图像，然后在matlab命令窗口输入：magnify
4、点击鼠标左键，在图片上移动你会发现，鼠标所指的地方，会放大！
5、ctrl+左键固化，也可右键固化选择合适的放大区域。 如果选择错了暂时不用管它，等会可以删除！
6、点击图片左上的箭头，图片进入编辑模式。这样你可以修改，移动，甚至删除放大的区域。
7、通过移动和删除，即保持了图像的完整性，又能凸出我们需要强调的部分。
8、% start of programfunction magnify(f1)婊剧琏兄% magnify(f1)% Figure creates a magnification bo旌忭檀挢x when under the mouse position when a button is pressed. Press '+'/'-' while% button pressed to increase/decrease magnification. Press '>'/'<' while button pressed to increase/decrease box size.% Hold 'Ctrl' while clicking to leave magnification on figure.%% Example:% plot(1:100,randn(1,100),(1:300)/3,rand(1,300)), grid on,% magnify;if (nargin == 0), f1 = gcf; end;figure(f1);set(f1, ... 'WindowButtonDownFcn', @ButtonDownCallback, ... 'WindowButtonUpFcn', @ButtonUpCallback, ... 'WindowButtonMotionFcn', @ButtonMotionCallback, ... 'KeyPressFcn', @KeyPressCallback);return;function ButtonDownCallback(src,eventdata) f1 = src; a1 = get(f1,'CurrentAxes'); a2 = copyobj(a1,f1); set(f1, ... 'UserData',[f1,a1,a2], ... 'Pointer','fullcrosshair', ... 'CurrentAxes',a2); set(a2, ... 'UserData',[2,0.2], ... %magnification, frame size 'Color',get(a1,'Color'), ... 'Box','on'); xlabel(''); ylabel(''); zlabel(''); title(''); set(get(a2,'Children'), ... 'LineWidth', 2); set(a1, ... 'Color',get(a1,'Color')*0.95); set(f1, ... 'CurrentAxes',a1); ButtonMotionCallback(src);return;function ButtonUpCallback(src,eventdata) H = get(src,'UserData'); f1 = H(1); a1 = H(2); a2 = H(3); set(a1, ... 'Color',get(a2,'Color')); set(f1, ... 'UserData',[], ... 'Pointer','arrow', ... 'CurrentAxes',a1); if ~strcmp(get(f1,'SelectionType'),'alt'), delete(a2); end;return;function ButtonMotionCallback(src,eventdata) H = get(src,'UserData'); if ~isempty(H) f1 = H(1); a1 = H(2); a2 = H(3); a2_param = get(a2,'UserData'); f_pos = get(f1,'Position'); a1_pos = get(a1,'Position'); [f_cp, a1_cp] = pointer2d(f1,a1); set(a2,'Position',[(f_cp./f_pos(3:4)) 0 0]+a2_param(2)*a1_pos(3)*[-1 -1 2 2]); a2_pos = get(a2,'Position'); set(a2,'XLim',a1_cp(1)+(1/a2_param(1))*(a2_pos(3)/a1_pos(3))*diff(get(a1,'XLim'))*[-0.5 0.5]); set(a2,'YLim',a1_cp(2)+(1/a2_param(1))*(a2_pos(4)/a1_pos(4))*diff(get(a1,'YLim'))*[-0.5 0.5]); end;return;function KeyPressCallback(src,eventdata) H = get(gcf,'UserData'); if ~isempty(H) f1 = H(1); a1 = H(2); a2 = H(3); a2_param = get(a2,'UserData'); if (strcmp(get(f1,'CurrentCharacter'),'+') | strcmp(get(f1,'CurrentCharacter'),'=')) a2_param(1) = a2_param(1)*1.2; elseif (strcmp(get(f1,'CurrentCharacter'),'-') | strcmp(get(f1,'CurrentCharacter'),'_')) a2_param(1) = a2_param(1)/1.2; elseif (strcmp(get(f1,'CurrentCharacter'),'<') | strcmp(get(f1,'CurrentCharacter'),',')) a2_param(2) = a2_param(2)/1.2; elseif (strcmp(get(f1,'CurrentCharacter'),'>') | strcmp(get(f1,'CurrentCharacter'),'.')) a2_param(2) = a2_param(2)*1.2; end; set(a2,'UserData',a2_param); ButtonMotionCallback(src); end;return;% Included for completeness (usually in own file)function [fig_pointer_pos, axes_pointer_val] = pointer2d(fig_hndl,axes_hndl)%%pointer2d(fig_hndl,axes_hndl)%%Returns the coordinates of the pointer (in pixels)%in the desired figure (fig_hndl) and the coordinates% in the desired axis (axes coordinates)%% Example:% figure(1),% hold on,% for i = 1:1000,% [figp,axp]=pointer2d;% plot(axp(1),axp(2),'.','EraseMode','none');% drawnow;% end;% hold off% Rick Hindman - 4/18/01if (nargin == 0), fig_hndl = gcf; axes_hndl = gca; end;if (nargin == 1), axes_hndl = get(fig_hndl,'CurrentAxes'); end;set(fig_hndl,'Units','pixels');pointer_pos = get(0,'PointerLocation');%pixels {0,0} lower leftfig_pos = get(fig_hndl,'Position');%pixels {l,b,w,h}fig_pointer_pos = pointer_pos - fig_pos([1,2]);set(fig_hndl,'CurrentPoint',fig_pointer_pos);if (isempty(axes_hndl)),axes_pointer_val = [];elseif (nargout == 2),axes_pointer_line = get(axes_hndl,'CurrentPoint');axes_pointer_val = sum(axes_pointer_line)/2;end;% end of program