how to obtain the gray level values of the image pixels??

1 次查看（过去 30 天）

Meghashree G 2015-12-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260966-how-to-obtain-the-gray-level-values-of-the-image-pixels

评论： Meghashree G 2016-1-8

I'm doing handwriting analysis,for that one feature is to identify the pressure.For the analysis of pen pressure, Mean gray level value is computed using the gray level values of the image pixels.But how to take these gray level values?? For reference i have attached the image.Please do help me.Thank you

if i use

meanIntensityValue = mean(grayImage(:));

is it that mean of both white and black pixels ? i want only mean of black pixels.

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。

回答（1 个）

Image Analyst 2015-12-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260966-how-to-obtain-the-gray-level-values-of-the-image-pixels#answer_203775

在 MATLAB Online 中打开

You can get a mask of the letters using my attached demo.

Then do

meanGrayLevel = grayImage(mask);

9 个评论
显示 7更早的评论隐藏 7更早的评论

Image Analyst 2015-12-22

mask in that line of code is called binaryImage in the document_threshold.m file.

You can put the line of code to compute the mean gray level wherever you need it, perhaps right after you compute the binary image mask.

Meghashree G 2016-1-8

Thank you sir.And very sorry for asking after a long gap! I am now calculating meanGrayLevel,but its not displaying anything in the terminal.How do i get the value?please help me

请先登录，再进行评论。

请先登录，再回答此问题。