imresize error. "Expected input method to be a string or a character vector. Allowed values are: 'cubic' or 'bicubic'."

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Daigo 2021 年 12 月 27 日
コメント済み: Daigo 2021 年 12 月 30 日
I get the error message:
Expected input method to be a string or a character vector. Allowed values are:
'cubic' or 'bicubic'.
when running the following code:
scale = delta1/delta2;
Image_scaled = imresize(Image, scale, 'bilinear');
Strangely, this error happens only when I run the code on a GPU server, but not on a CPU. Do you have any idea what is causing this error? I do not want to use cubic or bicubic interpolation in my code.
Note that the variable 'Image' is a gpuArray, and I also get the warning message:
Warning: The CUDA driver must recompile the GPU libraries because your device is more recent than the libraries. Recompiling can take several minutes.
In parallel_function>make_general_channel/channel_general (line 837)
In remoteParallelFunction (line 46)


Daigo 2021 年 12 月 28 日
I could solve this problem by retrieving the array from the GPU by gather function.
grayImage = gather(gpu_grayImage);
grayImage_scaled = imresize(grayImage, scale, 'bilinear');

その他の回答 (2 件)

Alex Taylor
Alex Taylor 2021 年 12 月 30 日
If you look at the documentation for previous versions of MATLAB, under the Extended Capabilities section for gpuArray in the imresize doc, there is a note that only bicubic interpolation was supported for gpuArray/imresize in R2020b and previous versions:
In R2021a and later the full set of interpolants work for gpuArray inputs.
  1 件のコメント
Daigo 2021 年 12 月 30 日
Thank you for your follow-up, Alex! I was missing the note in the documentation. This section will be helpful when I need to check the limitations of other functions as well. Thank you for pointing out!


Image Analyst
Image Analyst 2021 年 12 月 27 日
First of all, it's probably not a good idea to call your variable Image since image() is a built-in function. I know one is capital and one is not, but still, I would not recommend it.
What is delta1 and delta2? Take the semicolon off and see what the value is. Might scale be an array?
Does the code below work for you?
grayImage = imread('moon.tif');
whos grayImage
Name Size Bytes Class Attributes grayImage 537x358 192246 uint8
subplot(1, 2, 1);
axis('on', 'image')
delta1 = 3
delta1 = 3
delta2 = 50
delta2 = 50
scale = delta1/delta2
scale = 0.0600
whos scale
Name Size Bytes Class Attributes scale 1x1 8 double
smallImage = imresize(grayImage, scale, 'bilinear');
subplot(1, 2, 2);
axis('on', 'image')
  1 件のコメント
Daigo 2021 年 12 月 28 日
Hi, thank you for your answer! Actually your code worked but not for my input image. The problem was due to the gpuArray. It seems like the imresize function does not work properly for the gpuArray input.






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