How do I get the values of the surrounding pixels when I choose a particular pixel in an image?

5 次查看（过去 30 天）

The Imagician 2016-11-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310378-how-do-i-get-the-values-of-the-surrounding-pixels-when-i-choose-a-particular-pixel-in-an-image

评论： The Imagician 2016-11-3

I'm trying to estimate the possible points of intersection between two lines (arrays) in an image. Is there any function to return the values of the surrounding pixels for a particular value of the array?

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。

采纳的回答

Image Analyst 2016-11-2

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310378-how-do-i-get-the-values-of-the-surrounding-pixels-when-i-choose-a-particular-pixel-in-an-image#answer_241768

在 MATLAB Online 中打开

Assuming it's a gray scale image, and that the row and column is not on the edge of the image:

surroundingWindow = grayImage(row-1:row+1, col-1:col+1);

If it's color:

surroundingWindow = rgbImage(row-1:row+1, col-1:col+1, :);

6 个评论
显示 4更早的评论隐藏 4更早的评论

Image Analyst 2016-11-2

When you said "for a particular value of the array" I assume you had the row and column and when you said "values of the surrounding pixels" I assume you meant the pixel values in a 3-by-3 square around that particular row and column.

For the case you gave now (which you should have posted in the beginning to save time), you must have the coordinates of the yellow and green lines, or else you could not have plotted them. If you have the Statistics and Machine Learning Toolbox, you can use pdist2() to get the distance of every yellow point to every green point. Then you can threshold that to find out which are closer than a certain threshold. You need to do this because there's a good chance that there are no points which have the exact values out to dozens of decimal points. So using pdist2() you can find out which yellow and green points (the indexes) are very close to each other.

Give it a try yourself first. If you can't do it, post some data and I'll see what I can do.

Image Analyst 2016-11-3

在 MATLAB Online 中打开

You'd need to do this:

[rows, columns] = find(abs(Pdist) > 50);

The Imagician 2016-11-3

Thank you! The logic is great and helped me a lot :-)

请先登录，再进行评论。

类别

Image Processing and Computer Vision Image Processing Toolbox Image Segmentation and Analysis

在 Help Center 和 File Exchange 中查找有关 Image Segmentation and Analysis 的更多信息

产品

Statistics and Machine Learning Toolbox

Community Treasure Hunt

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

Start Hunting!

Translated by

How do I get the values of the surrounding pixels when I choose a particular pixel in an image?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

6 个评论
显示 4更早的评论隐藏 4更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

Community Treasure Hunt

How do I get the values of the surrounding pixels when I choose a particular pixel in an image?

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

6 个评论 显示 4更早的评论隐藏 4更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

6 个评论
显示 4更早的评论隐藏 4更早的评论