Why do number of features are different for same person's retinal image

1 次查看（过去 30 天）
Sidra Aleem
Sidra Aleem 2017-4-7
编辑： Sidra Aleem 2017-4-10
I am doing a project "Personal Identification on the basis of Retina". I have made feature matrix that comprise of distance and angles between a candidate a feature point and its 4 nearest neighbors. In my data set I have two images per person. When I calculate my feature matrix then for both the images of same person the number of extracted features is different. Will this difference effect the results in matching step between test data and training data?? Or there is some way through which I can correct this? Below are two images of same person.

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2017-4-7
It depends on what you call a feature. For a simple example, let's say that your features were the optic disc diameter, and the number of vessel bifurcations. So that's just two features and it will be two features for all possible images, even though the values of those features may be different.
Or lets say the features were the optic disc diameter, the number of vessel bifurcations, and the (x,y) locations of vessel bifurcations. If you consider the list of locations as a single feature, since they can be stored in an N by 2 array, then you just have 3 features. However if you consider the list to be N features, then you have N+2 features total and that will vary from image to image because the number of bifurcations, N, will vary from image to image.
  7 个评论
显示 5更早的评论
Sidra Aleem
Sidra Aleem 2017-4-10
编辑：Sidra Aleem 2017-4-10
@Image Analyst I have Implemented CN technique on my own. Because bwmorph(binaryImage, 'branchpoints'); gives 1 to only crossing number points. Whereas my feature points are "end points, bifurcation and crossing")
I am also able to get end points with bwmorph(binaryImage, 'endpoints');
However I need bifurcation points as well. Below is the example of bifurcation point.
[1 0 1
0 1 0
0 1 0]
it should become
[0 0 0
0 1 0
0 0 0]
is there anyway to get this by bwmorph as well?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Image Segmentation and Analysis 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