MATLAB 制作抖音同款突出效果海报

效果如下：

步骤 1.导入图片，获取每个区域的平均颜色，构造随机数矩阵

导入图片后我们首先将图片划分成很多个15x15(可自行调整大小)的小格子，并求取每个格子的颜色平均值，作为柱状图每个小柱子的颜色，构造随机数矩阵作为每个小柱子的高度

oriPic=imread('test.jpg'); pixLen=15; [H,W,~]=size(oriPic); XList=1:pixLen:W-pixLen; YList=1:pixLen:H-pixLen; samplePic=zeros(length(YList),length(XList),3); for x=XList for y=YList
        sampleSquareR=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,1)); sampleSquareG=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,2)); sampleSquareB=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,3)); samplePic(y==YList,x==XList,1)=mean(sampleSquareR(:)); samplePic(y==YList,x==XList,2)=mean(sampleSquareG(:)); samplePic(y==YList,x==XList,3)=mean(sampleSquareB(:)); end
end
randiMat=randi([0,250],[length(YList),length(XList)]); 

原始图片： 如果用方块颜色矩阵和方块高度矩阵直接去画图的话，会因为每个颜色只有一个点，而出现如下的效果， 为了画出一个一个小平台的效果，我们要将每个点扩充成15X15个颜色相同，高度相同的点集

2.点集扩充，曲面绘制

expCMat=zeros(length(YList)*pixLen,length(XList)*pixLen,3); expZMat=zeros(length(YList)*pixLen,length(XList)*pixLen); for x=XList for y=YList expCMat(y:y-1+pixLen,x:x-1+pixLen,1)=samplePic(y==YList,x==XList,1); expCMat(y:y-1+pixLen,x:x-1+pixLen,2)=samplePic(y==YList,x==XList,2); expCMat(y:y-1+pixLen,x:x-1+pixLen,3)=samplePic(y==YList,x==XList,3); expZMat(y:y-1+pixLen,x:x-1+pixLen)=randiMat(y==YList,x==XList); end
end [XMesh,YMesh]=meshgrid(1:length(XList)*pixLen,1:length(YList)*pixLen); surf(XMesh,expZMat,YMesh(end:-1:1,:),'CData',expCMat./255,... 'FaceColor','interp','edgeColor','none',... 'SpecularStrength',0,'AmbientStrength',1,'DiffuseStrength',1) 

效果： 我们会发现此时每个小方块界限并不明显，而且当正面看时，曲面几乎看不出任何突出效果，这两点可以通过设置前缩透视法，和增添光照来解决

3.坐标区属性设置及前缩透视法

以下大部分代码为了调整视角和颜色，ax.Projection=‘perspective’; 用来设置前缩透视

ax=gca; hold(ax,'on') ax.Projection='perspective'; ax.Color=[0.95 0.95 0.95]; ax.DataAspectRatioMode='manual'; ax.DataAspectRatio=[1,0.1,1]; ax.XLim=[0,W]; ax.ZLim=[0,H]; ax.View=[-0.4830 -0.0717]; ax.XTick=[]; ax.YTick=[]; ax.ZTick=[]; ax.XColor='none'; ax.YColor='none'; ax.ZColor='none'; 

效果：

4.光照设置

可以根据自己的喜好微调哦

h = light; h.Style='local'; h.Color=[1,1,1].*0.5; h.Position=[W/2,-1000,0]; 

效果：

5.完整代码

function pieceWisePic

oriPic=imread('test4.jpg'); pixLen=15; [H,W,~]=size(oriPic); XList=1:pixLen:W-pixLen; YList=1:pixLen:H-pixLen; samplePic=zeros(length(YList),length(XList),3); for x=XList for y=YList
        sampleSquareR=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,1)); sampleSquareG=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,2)); sampleSquareB=double(oriPic(y:y-1+pixLen,x:x-1+pixLen,3)); samplePic(y==YList,x==XList,1)=mean(sampleSquareR(:)); samplePic(y==YList,x==XList,2)=mean(sampleSquareG(:)); samplePic(y==YList,x==XList,3)=mean(sampleSquareB(:)); end
end
randiMat=randi([0,250],[length(YList),length(XList)]); expCMat=zeros(length(YList)*pixLen,length(XList)*pixLen,3); expZMat=zeros(length(YList)*pixLen,length(XList)*pixLen); for x=XList for y=YList expCMat(y:y-1+pixLen,x:x-1+pixLen,1)=samplePic(y==YList,x==XList,1); expCMat(y:y-1+pixLen,x:x-1+pixLen,2)=samplePic(y==YList,x==XList,2); expCMat(y:y-1+pixLen,x:x-1+pixLen,3)=samplePic(y==YList,x==XList,3); expZMat(y:y-1+pixLen,x:x-1+pixLen)=randiMat(y==YList,x==XList); end
end [XMesh,YMesh]=meshgrid(1:length(XList)*pixLen,1:length(YList)*pixLen); surf(XMesh,expZMat,YMesh(end:-1:1,:),'CData',expCMat./255,... 'FaceColor','interp','edgeColor','none',... 'SpecularStrength',0,'AmbientStrength',1,'DiffuseStrength',1) ax=gca; hold(ax,'on') ax.Projection='perspective'; ax.Color=[0.95 0.95 0.95]; ax.DataAspectRatioMode='manual'; ax.DataAspectRatio=[1,0.1,1]; ax.XLim=[0,W]; ax.ZLim=[0,H]; ax.View=[-0.4830 -0.0717]; ax.XTick=[]; ax.YTick=[]; ax.ZTick=[]; ax.XColor='none'; ax.YColor='none'; ax.ZColor='none'; h = light; h.Style='local'; h.Color=[1,1,1].*0.5; h.Position=[W/2,-1000,0]; end

尝试的其他几个图 当方块取的较小时(5x5)

另：