Effacer les filtres
Effacer les filtres

Can I use blob detection to detect my hand?

4 vues (au cours des 30 derniers jours)
Anjana Rao
Anjana Rao le 14 Fév 2014
Réponse apportée : zhang le 25 Avr 2014
I want to detect my hand from a video, and I've used the blob detection code from ImageAnalyst's file exchange to try and do it, but it won't work. Can someone tell me where I'm going wrong? Or suggest some other method for hand detection? Here's the code I've used:
clear all;
close all;
vid = videoinput('winvideo', 1, 'YUY2_640x480'); %specify the video adaptor
src = getselectedsource(vid);
vid.ReturnedColorspace = 'grayscale'; %define the color format to GRAYSCALE
vid.FramesPerTrigger = 5;
preview(vid); %preview the video object
preview(vid); %preview the video object
currentimg=getsnapshot(vid); %capture the image of interest
grayImage = currentimg;
% Get the dimensions of the image. numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage);
% Binarize the image.
binaryImage = im2bw(grayImage,0.58);
binaryImage = imfill(binaryImage, 'holes');
binaryImage = bwareaopen(binaryImage, 8000);
[labeledImage numberOfBlobs] = bwlabel(binaryImage, 8);
% Get all the blob properties.
blobMeasurements = regionprops(labeledImage, 'BoundingBox','Area');
allBlobAreas = [blobMeasurements.Area];
% Display the original gray scale image.
imshow(grayImage, []);
% Loop through all blobs, putting up Bounding Box.
hold on; % Prevent boxes from blowing away the image and prior boxes.
for k = 1 : numberOfBlobs
boundingBox = blobMeasurements(k).BoundingBox; % Get box.
x1 = boundingBox(1);
y1 = boundingBox(2);
x2 = x1 + boundingBox(3) - 1;
y2 = y1 + boundingBox(4) - 1;
verticesX = [x1 x2 x2 x1 x1];
verticesY = [y1 y1 y2 y2 y1];
plot(verticesX, verticesY);
Thank you!

Réponse acceptée

Image Analyst
Image Analyst le 14 Fév 2014
"it won't work" is not very descriptive. Can you attach an image/snapshot that it did not work for. You may need to adjust your threshold.
  9 commentaires
Image Analyst
Image Analyst le 16 Fév 2014
No one can say without looking at code. Put a stop in your catch statement and then investigate variables.
Anjana Rao
Anjana Rao le 17 Fév 2014
Okay! Thank you again!

Connectez-vous pour commenter.

Plus de réponses (1)

zhang le 25 Avr 2014


En savoir plus sur Image Processing and Computer Vision dans Help Center et File Exchange

Community Treasure Hunt

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

Start Hunting!

Translated by