About generating the binary image from mathematical coordinates
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi there,
I get a set of points in two dimensional Cartesian system, that is (x, y). My purpose is to generate a two-dimensional binary image with that coordinates. But the range for y and x are different and the step is not fixed. Actually, the pair of values are generated by random number in [0, 1] and mapping to a range with some formula
y: [-2pi, 2pi]
x: [0, 4pi]
if I plot each "point" on the figure it will show some shape actually. But my problem I don't want to plot it to a figure and then save it as image. So is that any way to convert that directly to a binary image of size N x N?
Actually, I try something like this
img = zeros(N, N);
xp = int32(x*N/(4*pi));
yp = int32((y+2*pi)*N/(4*pi));
img(xp, yp) = 1;
but it takes forever to run the program.
any better way to do that? Thanks.
0 commentaires
Réponses (1)
Walter Roberson
le 29 Fév 2012
Use vectors of xp and yp, and use subsref() to do the assignment.
fix() or round() might be more efficient than int32()
Voir également
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!