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; endend
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 consPosterbkgPic=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; endend% 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“怎么利用Matlab一键生成工地海报特效”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注编程网网站，小编将为大家输出更多高质量的实用文章！
