rbg2gray problem when reading .png files
显示 更早的评论
I'm trying to run the PCA code downloaded from here . I have no problems running with the provided images that are in .jpg. However, when I try to run with my own images (greyscale, in .png format), I keep getting the error
Error using rgb2gray>parse_inputs (line 77)
MAP must be a m x 3 array.
Error in rgb2gray (line 52)
[X, threeD] = parse_inputs(X);
Error in CreateDatabase (line 43)
img = rgb2gray(img);
Error in example (line 26)
T = CreateDatabase(TrainDatabasePath);
I even tried to convert the .png files to .jpg, first using imread to read the file, then imwrite to convert, but I still get the same error.
What is wrong?
采纳的回答
Geoff Hayes
2015-11-1
0 个投票
Rayne - you say that you observe the above errors when you use your own greyscale images. Why would you call rgb2gray on an image that is already grayscale (and whose purpose is to Convert RGB image or colormap to grayscale)?
Look at the link to this method and check the input which is a three dimensional numeric array. Your grayscale images are most likely two dimensional only and so the above error message makes sense.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Dimensionality Reduction and Feature Extraction 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
