给我一个能运行的精配准MATLAB代码
时间: 2024-03-01 12:52:00 浏览: 55
实用matlab代码
以下是一个基于互相关的雷达干涉影像配准的MATLAB代码示例,你可以根据自己的数据进行修改:
```
% 读取两幅雷达干涉影像
I1 = imread('interferogram1.tif');
I2 = imread('interferogram2.tif');
% 对图像进行预处理
I1 = imadjust(I1);
I2 = imadjust(I2);
% 定义搜索范围和搜索步长
search_range = 32;
step_size = 4;
% 计算互相关函数
C = normxcorr2(I1,I2);
% 在互相关函数中寻找最大值
[max_c, imax] = max(abs(C(:)));
[ypeak, xpeak] = ind2sub(size(C),imax(1));
% 计算位移量
corr_offset = [(xpeak-size(I1,2)) (ypeak-size(I1,1))];
% 在搜索范围内进行亚像素级别的配准
if search_range > 0
x_range = max(1,xpeak-search_range):min(size(C,2),xpeak+search_range);
y_range = max(1,ypeak-search_range):min(size(C,1),ypeak+search_range);
C = C(y_range,x_range);
[x_offset,y_offset] = subpixel_offset(C,step_size);
corr_offset = corr_offset + [x_offset y_offset 0];
end
% 对第二幅影像进行平移
I2_registered = imtranslate(I2,corr_offset);
% 显示结果
figure;
subplot(1,2,1), imshow(I1), title('Reference Image');
subplot(1,2,2), imshow(I2_registered), title('Registered Image');
% 亚像素级别的偏移计算函数
function [x_offset,y_offset] = subpixel_offset(C,step_size)
[ysize,xsize] = size(C);
row_vals = -step_size:step_size;
col_vals = -step_size:step_size;
[cols,rows] = meshgrid(row_vals,col_vals);
cols = cols(:);
rows = rows(:);
offset_vals = zeros(length(rows),2);
for i=1:length(rows)
offset_vals(i,:) = [rows(i) cols(i)]*step_size;
end
C = abs(C);
c_max = max(C(:));
[x,y] = find(C==c_max,1);
x_offset = offset_vals(y,1);
y_offset = offset_vals(y,2);
if x > 1 && x < xsize && y > 1 && y < ysize
rows_interp = (y-1):(y+1);
cols_interp = (x-1):(x+1);
slice = C(rows_interp,cols_interp);
[x_interp,y_interp] = fit_parabola(slice);
x_offset = x_offset + x_interp - 2;
y_offset = y_offset + y_interp - 2;
end
end
% 拟合二次函数以计算亚像素级别的偏移
function [x,y] = fit_parabola(slice)
[ysize,xsize] = size(slice);
x = (xsize-1)/2;
y = (ysize-1)/2;
if xsize==3
a = slice(1);
b = slice(2);
c = slice(3);
denom = 2*(a-2*b+c);
if denom ~= 0
x = x + (c-a)/denom;
end
end
if ysize==3
a = slice(:,1);
b = slice(:,2);
c = slice(:,3);
denom = 2*(a-2*b+c);
if denom ~= 0
y = y + (c-a)./denom;
end
end
end
```
请注意,这只是一个示例代码,并且可能需要根据你的具体数据进行修改和调整。
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