Convert Pixel Values Back to Matrix Indices?

Question

Andrew Poissant 2018-7-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/409016-convert-pixel-values-back-to-matrix-indices

评论： Andrew Poissant 2018-7-6

I am taking a matrix of 1s and 0s and turning it into a binary image so that I can measure properties of the image using matlab's 'regionprops' function. I am getting the centroid and Major/Minor axis values of the binary image but those are all in terms of number of pixels. Is there a way to convert those values back to indices/matrix notation?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Guillaume 2018-7-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/409016-convert-pixel-values-back-to-matrix-indices#answer_327659

Hum, a binary image is a matrix of 1s and 0s. There is nothing to do turn one into the other.

regionprops returns its output as (x, y) where x is the column index of your matrix, and y is the row index of your matrix. So all you have to do to convert regionprops output into matrix index is swap the two columns.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Andrew Poissant 2018-7-6

The output for regionprops centroid is (x, y) in pixels from my understanding because I am getting decimal values for the centroid. For example, one centroid calculated is (24.21, 32), which is not an integer value? I was just thrown off with decimal outputs, leading me to believe the centroid and Major/Minor AxisLength functions have values of pixels and not indices.

请先登录，再进行评论。