利用Matlab一键生成工地海报特效

第利用Matlab一键生成工地海报特效目录1.使用效果2.图片准备和导入3.图像倾斜4.扭曲置换5.正交叠底6.缘修整(抠图)7.背景图像替换8.完整代码

1.使用效果

这篇的本质还是扭曲置换，其实看过前面几篇文章的应该都能猜出是怎样做到的，下面开始讲解：

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([1-0.020;-0.0210;001]);

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=================================================================

fori=1:size(grayscreenPic,1)

forj=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,:));

ifsep1==0

c=double(exforePic(i+offsetLim1,j+offsetLim1,:));

else

c=c2.*sep1+c1.*sep2;

newforePic(i,j,:)=c;

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(screenRange20)=newforePicR(screenRange

screenPicG(screenRange20)=newforePicG(screenRange

screenPicB(screenRange20)=newforePicB(screenRange

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

functionconsPoster

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([1-0.020;-0.0210;001]);

forePic=imwarp(forePic,tform);

exforePic=imresize(forePic,size(grayscreenPic)+26);

%扭曲置换=================================================================

fori=1:size(grayscreenPic,1)

forj=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,:));

ifsep1==0

c=double(exforePic(i+offsetLim1,j+offsetLim1,:));

else

c=c2.*sep1+c1.*sep2;

newforePic(i,j,:)=c;

%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(screenRange20)=newforePicR(screenRange

screenPicG(screenRange20)=newforePicG(screenRange

screenPicB(screenRange20)=newforePicB(screenRange

screenPic(:,:,1)=screenPicR;

screenPic(:,:,2)=screenPicG;

screenPic(:,:,3)=screenPicB;