How to recover the background image of a sequence

30 outubro 2017, 17:00 • João Paulo Salgado Arriscado Costeira

Given a sequence taken from a static camera, how to compute the background image using the median (explained in class). Check with twocams_books dataset.

imgmed=zeros(480,640,45);

for i=1:45,

    load(['depth1_' int2str(i) '.mat']);

    imagesc(depth_array);

    imgmed(:,:,i)=double(depth_array)/1000;

    pause(.1)

    drawnow;

end

bg=median(imgmed,3);

d=dir('depth1*.mat');

for i=1:length(d),

    load(d(i).name);

    imagesc(abs(double(depth_array)/1000-bg)>.25);

    colormap(gray);

    pause(1);

end

IV - Image Features

30 outubro 2017, 15:30 • José Santos-Victor

IV - Image Features 
Grouping edge points in more complex shapes.
The Hough transform. Examples with the line and circles.

IV - Image Features

27 outubro 2017, 15:30 • José Santos-Victor

IV - Image Features 
Motivation. Keypoints and edges. The role of edge information for human visual perception.
Image gradient, non maximum suppression.  The Canny edge detector. Ransac

3D point cloud registration and feature matching

27 outubro 2017, 09:30 • João Paulo Salgado Arriscado Costeira

Continuaçao

3D point cloud registration and feature matching

26 outubro 2017, 14:00 • João Paulo Salgado Arriscado Costeira

Continuaçao