怎么利用Matlab一键生成工地海报特效

怎么利用Matlab一键生成工地海报特效

本篇内容介绍了“怎么利用Matlab一键生成工地海报特效”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

1.使用效果

2.图片准备和导入

首先m文件所在文件夹内应该有如下两张图：

此外还需要一张近似方形的图片也要一起放在文件夹中，之后通过以下代码导入和初步处理图片(选择幕布部分和去色代码，可左右滑动)：

bkgPic=imread('bkg.jpg');                 % 背景图  screenPic=bkgPic(190:555,(190:555)+160,:);% 幕布区域图片  grayscreenPic=rgb2gray(screenPic);        % 灰度化幕布区域图片    screenRange=imread('screenRange.jpg');    % 幕布范围图(用来扣幕布边缘细节)  screenRange=rgb2gray(screenRange);    forePic=imread('2048.jpg');               % 要做成海报的图片

3.图像倾斜

我们可以看出幕布是有些倾斜的，我们为了让图片和幕布更加贴近，我们将图片进行倾斜处理并将其调整至与幕布区域相似的大小：

% 前景图片变形=============================================================  tform=affine2d([1 -0.02 0;-0.02 1 0; 0 0 1]);  forePic=imwarp(forePic,tform);  exforePic=imresize(forePic,size(grayscreenPic)+26);

4.扭曲置换

这部分参考之前布料贴图的部分呀：

% 扭曲置换=================================================================  for i=1:size(grayscreenPic,1)      for j=1:size(grayscreenPic,2)          goffset=(double(grayscreenPic(i,j))-128)/10;          offsetLim1=floor(goffset)+13;          offsetLim2=ceil(goffset)+13;          sep1=goffset-floor(goffset);          sep2=ceil(goffset)-goffset;          c1=double(exforePic(i+offsetLim1,j+offsetLim1,:));          c2=double(exforePic(i+offsetLim2,j+offsetLim2,:));          if sep1==0              c=double(exforePic(i+offsetLim1,j+offsetLim1,:));          else              c=c2.*sep1+c1.*sep2;          end          newforePic(i,j,:)=c;      end  end

5.正交叠底

% 正交叠底=================================================================  newforePic=uint8((double(newforePic).*double(grayscreenPic))./220);  % imshow(newforePic)  % 旧版本的用下面这段代码  % newforePicR=double(newforePic(:,:,1)).*double(grayscreenPic)./220;  % newforePicG=double(newforePic(:,:,2)).*double(grayscreenPic)./220;  % newforePicB=double(newforePic(:,:,3)).*double(grayscreenPic)./220;  % newforePic(:,:,1)=newforePicR;  % newforePic(:,:,2)=newforePicG;  % newforePic(:,:,3)=newforePicB;  % newforePic=uint8(newforePic);

6.缘修整(抠图)

上方正交叠底后，幕布外面还是灰色，而且幕布内容部分超出幕布范围，我们可以用幕布范围图修整幕布：

% 边缘修整=================================================================  screenPicR=screenPic(:,:,1);newforePicR=newforePic(:,:,1);  screenPicG=screenPic(:,:,2);newforePicG=newforePic(:,:,2);  screenPicB=screenPic(:,:,3);newforePicB=newforePic(:,:,3);  screenPicR(screenRange>20)=newforePicR(screenRange>20);  screenPicG(screenRange>20)=newforePicG(screenRange>20);  screenPicB(screenRange>20)=newforePicB(screenRange>20);  screenPic(:,:,1)=screenPicR;  screenPic(:,:,2)=screenPicG;  screenPic(:,:,3)=screenPicB;  screenPic=uint8(screenPic);

7.背景图像替换

% 将背景图幕布区域换为新图=================================================  bkgPic(190:555,(190:555)+160,:)=screenPic;  imshow(bkgPic)

8.完整代码

function consPoster  bkgPic=imread('bkg.jpg');                 % 背景图  screenPic=bkgPic(190:555,(190:555)+160,:);% 幕布区域图片  grayscreenPic=rgb2gray(screenPic);        % 灰度化幕布区域图片    screenRange=imread('screenRange.jpg');    % 幕布范围图(用来扣幕布边缘细节)  screenRange=rgb2gray(screenRange);    forePic=imread('2048.jpg');               % 要做成海报的图片    % 前景图片变形=============================================================  tform=affine2d([1 -0.02 0;-0.02 1 0; 0 0 1]);  forePic=imwarp(forePic,tform);  exforePic=imresize(forePic,size(grayscreenPic)+26);    % 扭曲置换=================================================================  for i=1:size(grayscreenPic,1)      for j=1:size(grayscreenPic,2)          goffset=(double(grayscreenPic(i,j))-128)/10;          offsetLim1=floor(goffset)+13;          offsetLim2=ceil(goffset)+13;          sep1=goffset-floor(goffset);          sep2=ceil(goffset)-goffset;          c1=double(exforePic(i+offsetLim1,j+offsetLim1,:));          c2=double(exforePic(i+offsetLim2,j+offsetLim2,:));          if sep1==0              c=double(exforePic(i+offsetLim1,j+offsetLim1,:));          else              c=c2.*sep1+c1.*sep2;          end          newforePic(i,j,:)=c;      end  end    % 正交叠底=================================================================  newforePic=uint8((double(newforePic).*double(grayscreenPic))./220);  % imshow(newforePic)  % 旧版本的用下面这段代码  % newforePicR=double(newforePic(:,:,1)).*double(grayscreenPic)./220;  % newforePicG=double(newforePic(:,:,2)).*double(grayscreenPic)./220;  % newforePicB=double(newforePic(:,:,3)).*double(grayscreenPic)./220;  % newforePic(:,:,1)=newforePicR;  % newforePic(:,:,2)=newforePicG;  % newforePic(:,:,3)=newforePicB;  % newforePic=uint8(newforePic);    % 边缘修整=================================================================  screenPicR=screenPic(:,:,1);newforePicR=newforePic(:,:,1);  screenPicG=screenPic(:,:,2);newforePicG=newforePic(:,:,2);  screenPicB=screenPic(:,:,3);newforePicB=newforePic(:,:,3);  screenPicR(screenRange>20)=newforePicR(screenRange>20);  screenPicG(screenRange>20)=newforePicG(screenRange>20);  screenPicB(screenRange>20)=newforePicB(screenRange>20);  screenPic(:,:,1)=screenPicR;  screenPic(:,:,2)=screenPicG;  screenPic(:,:,3)=screenPicB;  screenPic=uint8(screenPic);  % imshow(screenPic)    % 将背景图幕布区域换为新图=================================================  bkgPic(190:555,(190:555)+160,:)=screenPic;  imshow(bkgPic)  end

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