matlab基础

>> f=imread('cat9.jpg');
>> whos f
  Name        Size                Bytes  Class    Attributes

  f         204x204x3            124848  uint8              

>> 
>> imshow(f)
>> imshow(f),figure ,imshow('car.jpg') %同时显示两幅图像,用到figure
>> imwrite(f,'result.jpg'); 

亮度变换：

g1=imadjust(f,[0.5 0.75],[1 0],2);%将f中0.5~0.75的灰度级扩展到0~1,gamma》1变亮，反之变暗

>> x=0:pi/10:2*pi; %构造向量，以pi/10为单位
>> y1=sin(x);
>> y2=cos(x);
>> plot(x,y1,x,y2)
>>