how to convert image to binary based on histogram

3 次查看（过去 30 天）
Jessica
Jessica 2011-12-18
I need help in converting an image to binary based on histogram. is there a function to do that in matlab? I know there is a function called im2bw(image, thresholdLevel) I could use that but how do I get the level? do I choose something from the histogram?
Thanks

请先登录，再回答此问题。

回答（2 个）

Image Analyst
Image Analyst 2011-12-18
Avishek
Avishek 2011-12-18
there are several means of automatic thresholding. kmeans, ostu are the most popular if you want to do the thresholding manually
1) plot the histrogram using imhist()
2) find the point in the x-axis of histrogram that seems to divide the histrogram into two parts
if u choose to do it automatically
1) graythresh() gives you ostu thresholding
2)kmeans(), for clustering, this function has various options. you can modify it a bit to get what type of threshold you want.

类别

在 Help Center 和 File Exchange 中查找有关 Histograms 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by