how can I create a circle band imaged from the 3 dots imaged?

1 次查看（过去 30 天）
Naomi Penelope
Naomi Penelope 2021-7-18
评论： Image Analyst 2021-7-18
how can I create a circle band imaged from the 3 dots imaged?

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2021-7-18
Not sure what you mean. Do you want a circle that bounds the 3 blobs? If so, do you want to bound the whole spot, or just the centroids? Please elaborate.
Basically, find the spots using thresholding,
mask = grayImage > someThresholdValue;
then find either
  1. the centroids with regionprops(mask, 'Centroid') or
  2. the farthest point from the center of the 3 spots using regionprops(mask, 'Centroid', 'PixelList')
Then use code from the FAQ
https://matlab.fandom.com/wiki/FAQ#How_can_I_fit_a_circle_to_a_set_of_XY_data.3F
to fit a circle through the 3 points. Then you can use viscircles() to put the circle into the overlay above the gray scale image.
  2 个评论
Image Analyst
Image Analyst 2021-7-18
Simply threshold a range of values. See my interactive thresholding app:
https://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image?s_tid=srchtitle
To get only 3 blobs, you can get the 3 largest blobs like this:
% Interactively threshold the gray scale image using Image Analyst's function.
[lowThreshold, highThreshold] = threshold(lowThreshold, highThreshold, grayImage);
% Create binary image mask from the thresholds.
mask = grayImage >= lowThreshold & grayImage <= highThreshold;
% Extract 3 largest blobs which will be the rings.
mask = bwareafilt(mask, 3);

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Read, Write, and Modify Image 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by