警告：将非浮点数据转换为单个数据

Question

我一直在使用特征提取和对极几何。然而，我不断横跨以下错误来：

Warning: Converting non-floating point data to single. In pdist2 (line 219) In extractFeaturesU (line 93)

被返回警告消息的代码行是：

[distance, position] = sort(pdist2(double(repmat(featuresA, size(xPoints, 1))), featuresB), 2, 'ascend'); 

含有上述线的代码的一部分被显示在下面。 double类型之一，单类型之一：

%% extract features 
corresponding = []; 
rightBound = size(sharpImageB, 2); 
xPoints = 3 : 3 : rightBound - 3; 
for index = 1 : size(realWantedPoints, 2) 
    %extract features from wanted points 
    disp('extracting features from wanted points...'); 
    if strcmp(desc, 'hog') 
     [featuresA, pointsA] = extractHOGFeatures(sharpImageA, realWantedPoints(:, index)', ... 
     'CellSize', [8 8], 'BlockSize', [2 2], 'NumBins', 9, 'UseSignedOrientation', true); 
    elseif strcmp(desc, 'block') 
     [featuresA, pointsA] = extractFeatures(sharpImageA, realWantedPoints(:, index)', ... 
     'Method', 'Block', 'BlockSize', 21, 'Upright', true); 
    elseif strcmp(desc, 'surf') 
     [featuresA, pointsA] = extractFeatures(sharpImageA, realWantedPoints(:, index)', ... 
     'Method', 'SURF', 'SURFSize', 64, 'Upright', true); 
    end 

    % generate epipolar line points 
    liner = star([1 0 0]) * [realWantedPoints(:, index); 1]; 
    yPoints = -(liner(3) + (liner(1) * xPoints))/liner(2); 
    matrixB = [xPoints', yPoints']; 

    % extract features from epipolar line points 
    disp('extracting features from epipolar line points...'); 
    if strcmp('hog', desc) 
     [featuresB, pointsB] = extractHOGFeatures(sharpImageB, matrixB, ... 
     'CellSize', [8 8], 'BlockSize', [2 2], 'NumBins', 9, 'UseSignedOrientation', true); 
    elseif strcmp('block', desc) 
     [featuresB, pointsB] = extractFeatures(sharpImageB, matrixB, ... 
     'Method', 'Block', 'BlockSize', 21, 'Upright', true); 
    elseif strcmp('surf', desc) 
     [featuresB, pointsB] = extractFeatures(greyB, matrixB, ... 
     'Method', 'SURF', 'SURFSize', 64, 'Upright', true); 
    end 

    % calculate similarity 
    [distance, position] = sort(pdist2(double(repmat(featuresA, size(xPoints, 1))), featuresB), 2, 'ascend'); 
    corresponding = [corresponding; pointsB(position(1), :)]; 
end 

xB = corresponding(:, 1); 
yB = corresponding(:, 2); 

Answer 1

我可以用两个变量调用pdist2产生错误。例如。

x = ones(5,1,'single'); 
y = ones(5,1,'double'); 
pdist2(x,y); 

我的猜测是，你featuresB变量是单精度浮点，因此不符合您的第一个pdist2（这是双重因为你明确地将其转换）参数的类型。