是否可以在MATLAB中使用插值而不调整图像大小？

Question

我有一个图像，其中一些像素被有意地改为零。现在我想做一个双线性插值来找出使用邻域的新像素值，如双线性插值一样。但是，我不想调整图像大小（MATLAB只能使用调整大小功能进行双线性插值）。

是否有可能在MATLAB中进行双线性插值而不调整大小？我读到与双线性内核的卷积可以解决这个问题。你知道这是哪个内核吗？有可能做我想做的事吗？

Answer 1

你可以尝试使用由griddata支持的选项之一：

griddata(..., METHOD) where METHOD is one of 
    'nearest' - Nearest neighbor interpolation 
    'linear' - Linear interpolation (default) 
    'natural' - Natural neighbor interpolation 
    'cubic'  - Cubic interpolation (2D only) 
    'v4'  - MATLAB 4 griddata method (2D only) 
defines the interpolation method. The 'nearest' and 'linear' methods 
have discontinuities in the zero-th and first derivatives respectively, 
while the 'cubic' and 'v4' methods produce smooth surfaces. All the 
methods except 'v4' are based on a Delaunay triangulation of the data. 

例

% create sample data 
[X, Y] = meshgrid(1:10, 1:10); 
Z_original = X.*Y; 

% remove a data point 
Z_distorted = Z_original; 
Z_distorted(5, 5) = nan; 

% reconstruct 
valid = ~isnan(Z_distorted); 
Z_reconstructed = Z_distorted; 
Z_reconstructed(~valid) = griddata(X(valid),Y(valid),Z_distorted(valid),X(~valid),Y(~valid)); 

% plot the result 
figure 
surface(Z_original); 

figure 
surface(Z_distorted); 

figure 
surface(Z_reconstructed);