Thresholding an Image in MATLAB?

1 次查看（过去 30 天）

Anand 2014-3-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121919-thresholding-an-image-in-matlab

评论： Anand 2014-3-18

if the distance is less it would output a smiling expression and if the distance is more it would output a neutral expression.

A = smile expression B = Neutral expression

    A = 129; 
    B = 188; 
    Threshold = 155;
if A > B
error('threshold_grayscale_image : min_threshold is greater then max_threshold');
end
end
selected = (min_threshold >= A) & (B <= max_threshold);
  
  thresholded_image(selected) = A;
  return;

3 个评论
显示 1更早的评论隐藏 1更早的评论

sumi 2014-3-18

how to assign a threshold value...

Anand 2014-3-18

yes thats correct, any ideas?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst 2014-3-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121919-thresholding-an-image-in-matlab#answer_128796

I don't know what you mean. Do you mean you want to display an image of someone smiling or neutral depending on the condition? Do you have images for those two cases?

And how are you determining the "distance"?

10 个评论
显示 8更早的评论隐藏 8更早的评论

Image Analyst 2014-3-18

在 MATLAB Online 中打开

You defined T to be 155. You can call it T or Threshold, it doesn't matter, but they must be the same. A and B are just sample values from two of your images and are not really used. D is the actual value that your algorithm will calculate for whatever the current image is. You should add comments, right?

% D is the value for this face image.
% A typical value for a smiling face might be 129.
% A typical value for a neutral face might be 188.
% The threshold, or borderline, between smiling and not smiling
% is set to 155.