Count pixels for a particular sensor (quarterinch, halfinch)

Count pixel density for different sensor sizes and different pixel sizes.

See also: s_sensorPixelCounting

Copyright ImagEval Consultants, LLC, 2005.

Contents

ieInit

Here are all the known sensor formats

% Either the pixel count or the size in meters is printed out
sensorFormats
ans = 

            qqcif: [72 88]
             qcif: [144 176]
            qqvga: [120 160]
             qvga: [240 320]
              cif: [288 352]
              vga: [480 640]
             svga: [600 800]
             xvga: [768 1024]
             uvga: [1024 1280]
            uxvga: [1200 1600]
         halfinch: [0.0048 0.0064]
      quarterinch: [0.0024 0.0032]
    sixteenthinch: [0.0012 0.0016]

Calculate the pixels for a half inch

sSize = sensorFormats('half inch');    % Returns sensor size in meters
pSize = (0.8:0.2:3)*1e-6;             % Pixel size in meters

r = zeros(size(pSize));
c = zeros(size(pSize));
m = zeros(size(pSize));

for ii=1:length(pSize)
    r(ii) =  sSize(1) / pSize(ii);
    c(ii) =  sSize(2) / pSize(ii);
    m(ii) = ieN2MegaPixel(r(ii)*c(ii));
end

Plot for half inch

vcNewGraphWin;
plot(pSize*1e6,m,'-o')
grid on
xlabel('Pixel size (um)')
ylabel('Megapixel')

Quarter inch

sSize = sensorFormats('quarter inch');    % Returns sensor size in meters
pSize = (0.8:0.2:3)*1e-6;             % Pixel size in meters

r = zeros(size(pSize));
c = zeros(size(pSize));
m = zeros(size(pSize));

for ii=1:length(pSize)
    r(ii) =  sSize(1) / pSize(ii);
    c(ii) =  sSize(2) / pSize(ii);
    m(ii) = ieN2MegaPixel(r(ii)*c(ii));
end

Add the quarter inch curve

hold on
plot(pSize*1e6,m,'-o')
legend({'Half inch','Quarter inch'})