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detecting features on a big image object

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Miklós Förster
Miklós Förster 2020-11-15
评论： Ameer Hamza 2020-11-16
Hi,
I would like to ask some help for detecting SURF features on a big image object.
I use MATLAB2020b.
Code:
% Creat a big image object
bigIm = bigimage('my_geotiff_image');
% Convert it to grayscale
bigIm = getFullLevel(bigIm,bigIm.CoarsestResolutionLevel);
bigIm = rgb2gray(bigIm);
% Trying feature detection
refImPoints = apply(bigIm,1,@(block)detectSURFFeatures(block));
Error:
Undefined function 'apply' for input arguments of type 'function_handle'.
I would be greatful if we solve the problem:)

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-11-15
编辑：Ameer Hamza 2020-11-15
The input to apply() must also be a bigImage, and there are also some conditions on how to define the function handle as stated in the documentation: https://www.mathworks.com/help/images/ref/bigimage.apply.html#mw_4a662881-8964-426a-b268-1ad3b09e911d. Try following code
bigIm = bigimage('my_geotiff_image');
% Convert it to grayscale
bigIm = getFullLevel(bigIm,bigIm.CoarsestResolutionLevel);
bigIm = rgb2gray(bigIm);
bigIm = bigimage(bigIm);
% Trying feature detection
refImPoints = apply(bigIm,1,@(block){detectSURFFeatures(block)});

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