How to plot Hog features in the image

7 次查看（过去 30 天）
Elf
Elf 2017-5-3
回答： Birju Patel 2017-5-8
Hey
I am trying to feature extraction from an image for some certain points. First time I am using HogFeatureextraction. When I plot the features and valid points, I am getting result not on the certain points. I will use these features for training later on. For example, I have points on the straight line. Should not my features on where my certain points on the line. I am a little bit confused about concept of it. I used [features,validPoints] = extractHOGFeatures(I,points). x and y are my 10 positions in the image. In this case how is feature extraction working?
[features,validPoints] = extractHOGFeatures(I,[x,y]); figure; imshow(I); hold on; plot(features, 'ro'); plot(validPoints,'go');
Thank you

请先登录，再回答此问题。

回答（1 个）

Birju Patel
Birju Patel 2017-5-8
Hi,
The following example, will visualize the HOG features at a set of points:
I2 = imread('gantrycrane.png');
corners = detectFASTFeatures(rgb2gray(I2));
strongest = selectStrongest(corners, 3);
[hog2, validPoints, ptVis] = extractHOGFeatures(I2, strongest);
figure;
imshow(I2); hold on;
plot(ptVis, 'Color','green');
HTH

类别

在 Help Center 和 File Exchange 中查找有关 Computer Vision with Simulink 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