【问题标题】:To Assign a pixel value to a noninteger coordinate in an image in MATLAB在 MATLAB 中将像素值分配给图像中的非整数坐标
【发布时间】:2014-01-16 12:21:19
【问题描述】:

萨拉姆 我有一个关于在 MATLAB 中赋值的问题。我有一个 5x5 的图像,我想在 delaunay 三角剖分中使用表面近似将其大小增加 2 我使用二元多项式进行插值,对于每个三角形,现在计算 9 个常数我必须定义一个新网格并找到网格点的位置在三角测量中,然后使用这些常数来计算新坐标上的像素值,但是为非整数坐标计算的像素值不能分配给新图像

for R=2 and N1 and N2=5
%defining new grid
[X,Y] = meshgrid(1:1/R:N2,1:1/R:N1);

for triNum = 6 %i select a triangle
    pts = r(tri(triNum,:),:); %gives the three vertices of triangle (x,y,z) of each
    IN = inpolygon(X,Y,pts(:,1),pts(:,2));  % NxM%checks which point of X,Y are in that %triangle
    HRtriangles(ind2sub(size(IN),find(IN==1))) = triNum;  %assign the triangle number to a %new matrix, %hr triangls gives the HRgrid the num of triangle each grid point is

  points=[X(ind2sub(size(IN),find(IN==1))),Y(ind2sub(size(IN),find(IN==1)))] %find value Tof coordinates which ar in that triangle
    HRptC = c(HRtriangles(ind2sub(size(IN),find(IN==1))),: ); % a little error here because out of %32 triangles having 9 c values each i have to find the triangle containing points

% HRimage(points(:,1),points(:,2)) = sum(HRptC.*[1,points(:,1),points(:,2),points(:,1)^2,points(:,2)^2,points(:,1)^3,(x^2)*points(:,2),points(:,1)*(points(:,2)^2),points(:,2)^3]);
%main error here because HRimage is the image i have to form but for example for point %(1.5,1) i want to assign pixel value but due to non integer value of coordinate it cannot %be assigned



end

【问题讨论】:

  • 您应该使用插值来根据您在非整数坐标处的强度来查找整数值坐标的强度

标签: matlab grid delaunay spatial-interpolation


【解决方案1】:

我做了什么,我将整个网格乘以 2。因为我的网格从 1:0.5:5 开始,所以非整数网格点得到整数,我为它们分配了各自的值,作为所有列的第一行并且所有行的第一列都使用它为零,所以我使用这些命令行删除了额外的零行和列

对于我的矩阵 S

S( ~any(S,2), : ) = []; %行 S( :, ~any(S,1) ) = []; %列

【讨论】:

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