Are you able to count the number of pixels in a 3D plot?
조회 수: 2 (최근 30일)
이전 댓글 표시
I am trying to find a way to count the number of red pixels in my moving plot and I was only able to find the number of white pixels in only at an angle. Would it be possible to count the total number of red pixels in a 3D plot?
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
xlabel('My x label') % Axis Labels
ylabel('My y label')
zlabel('My z label')
view([-37.5 30]) % standard 3D View
scale = 0.5;
y = 1; % white percentage
%% range of results
d = 10; % Distance Between each point
nmesh = 3; % range
MagR = 0; % Magnetic Radius (MagR>nmesh = Strong, MagR<nmesh = weak, MagR = 0 = no Mag)
niter = 200; % no. of jumps
[X,Y,Z] = meshgrid((-nmesh+1):nmesh-1); % create mesh
X = X * d;
Y = Y * d;
Z = Z * d;
%% random direction for X,Y,Z directions
dx = normrnd(0,1,[(size(X,1))^3 niter]);
dy = normrnd(0,1,[(size(X,1))^3 niter]);
dz = normrnd(0,1,[(size(X,1))^3 niter]);
%% Magnetised particles
c0 = nmesh; % center of magnetic field
for i = 1:size(dx,1)
[ii,jj,kk] = ind2sub(size(X),i); % row and column of force
n = pdist2([ii jj kk],[c0 c0 c0]); % distance to point
if n < MagR % radius of magnetic force
dx(i,:) = -cumsum(dx(i,:)*0+(jj-c0)/n); % cosinus
dy(i,:) = -cumsum(dy(i,:)*0+(ii-c0)/n); % sinus
dz(i,:) = -cumsum(dz(i,:)*0+(kk-c0)/n);
end
end
cla
hold on
%% For Loop to plot
for i = 1:niter-1
X1 = X(:) + dx(:,i);
Y1 = Y(:) + dy(:,i);
Z1 = Z(:) + dz(:,i);
plot3([X(:) X(:)]'+[dx(:,i+1) dx(:,i)]', ...
[Y(:) Y(:)]'+[dy(:,i+1) dy(:,i)]',...
[Z(:) Z(:)]'+[dz(:,i+1) dz(:,i)]','.-r','MarkerSize',5,'LineWidth',1)
%p.MarkerSize = 10; % 6 is the default
%p.LineWidth = 1; % 0.5 is the default
pause(0.01)
%% percentage readings
Image = getframe();
K = sum(sum(rgb2gray(Image.cdata)==255));
percentageofwhite(y) = K/numel(rgb2gray(Image.cdata))*100;
delete(findall(gcf,'type','text'))
txt=text(0.0,0.95,sprintf('White Space = %0.3f%%',percentageofwhite(y)),'Units','normalized');
y=y+1;
%%
xlim([-2*d 2*d]) % Axis limitsg
ylim([-2*d 2*d])
zlim([-2*d 2*d])
end
hold off
rotate3d on
댓글 수: 5
Mrutyunjaya Hiremath
2020년 5월 5일
plot3([X(:) X(:)]'+[dx(:,i+1) dx(:,i)]', ...
[Y(:) Y(:)]'+[dy(:,i+1) dy(:,i)]',...
[Z(:) Z(:)]'+[dz(:,i+1) dz(:,i)]','.-r','MarkerSize',5,'LineWidth',1)
According to this, you are drawing 125 pair red points in each iteration
답변 (2개)
darova
2020년 5월 5일
Can you calculate the volume manually?
dv = [dx(:,i+1)-dx(:,i) dy(:,i+1)-dy(:,i) dz(:,i+1)-dz(:,i)];
V = V + pi*R*sqrt(sum(dv.^2,2)); % volume of all lines
Mrutyunjaya Hiremath
2020년 5월 6일
@ sui zhi lau,
Outside Loop
totalData = 0;
whitePixData = 40*40*40;
Inside Loop
redPixData(y) = sum(sqrt(((dx(:,i+1) - dx(:,i)).^2) + ((dy(:,i+1) - dy(:,i)).^2) + ((dz(:,i+1) - dz(:,i)).^2)));
totalData = totalData + redPixData(y);
percentageofred(y) = (totalData/whitePixData)*100;
txt=text(0.0,0.95,sprintf('White Space = %0.3f%%',percentageofred(y)),'Units','normalized');
댓글 수: 3
Mrutyunjaya Hiremath
2020년 5월 7일
because, we are not considering the elimination of overlapping area.
참고 항목
제품
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!