文档介绍：,图片转换clearall,clc%%[x,map]=imread('');figure(1)imshow(x)x1=rgb2gray(x);figure(2)imshow(x1)x2=flipud(x1);figure(3)imshow(x2)=xlsread('');>>d=xlsread('');>>c=xlsread('','L15:M19')c=>>>>d=X020619;>>d图形的绘制1、一般二维图像的绘制【plot(X,Y)】例一:plot(X,Y)x=[02157];y=[1-];figure(1)plot(x,y,'ro')holdonaxis([-28-612])【定义区间】plot(x,y)例二:plot(x1,y1,x2,y2,………)x=linspace(0,2*pi,50);plot(x,cos(x),'bo',x,sin(x),'r*')例三:(参数方程绘图)t=0:pi/500:2*pi;x=10*cos(t);y=2*sin(t);plot(x,y);gridon【显示网格线】例四:(隐函数的绘图)ezplot(f(x),[Xmin,Xmax],[Ymin,max])(默认区间为:-2*pi<x<2*pi,-2*pi<y<2*pi)ezplot('x^3+y^3-5*x*y',[-1010],[-1010])2、三维曲线绘制Plot(x1,y1,z1,选项,X2,y2,Z2,选项,………)Plot3(x,y,z)例一:(三维绘点)x=[02157];y=[1-];z=[23457]figure(2)plot3(x,y,z,'r*')axis([-28-61208])gridon例二:(三维曲线绘制)t=(0::2)*pi;x=sin(t);y=cos(t);z=cos(t*2);plot3(x,y,z,'b-',x,y,z,'rd')gridon3、三维曲面绘制[xx,yy]=meshgrid(x,y)【生成网格数据】mesh(x,y,z)【绘制表面图】surf(x,y,z)【绘制网格图】例一:>>x=[012];>>y=[234];>>[xx,yy]=meshgrid(x,y)【生成网格数据】xx=012012012yy=222333444例二:(mesh()和surf()的绘图比较)[x,y]=meshgrid(0:31);z=1./(1+(sqrt((x-16).^2+(y-16).^2)).^4./200);mesh(x,y,z);axis([0,31,031,0,1])[x,y]=meshgrid(0:31);z=1./(1+(sqrt((x-16).^2+(y-16).^2)).^4./200);surf(x,y,z);axis([0,31,031,0,1])