www.gusucode.com > matlab人类视觉系统(HVS)的工具箱 > matlab人类视觉系统(HVS)的工具箱/matlab人类视觉系统(HVS)的工具箱/func_CSF.m
function func_GrayCSF % Show Contrast Sensitive Function (CSF) via gray Sinwave stimulus % This function is part of the toolbox "Basic introduction to HVS" % % Command line % ---------------------- % func_GrayCSF % input: None % % output: CSF figure % % More information can be found in % S. E. Palmer, "Vision Science: From Photons to Phenomenology," MIT Press, % Cambridge, MA, 1999. % % % Jing Tian Apr.24 2004 % Contact me : scuteejtian@hotmail.com % Homepage : http://ikanchi.yeah.net % This program is written in Apr.2003 during my postgraduate in % NTU, Singapore. % ---------------------- % parameter of Sinwave stimulus % freq : frequency % C : Contrast % low : step : high freq = logspace(0.1, 0.9, 100)'; C = logspace(-2, 0, 100); L = 100; x = linspace(-1.5 * pi, 0.5 * pi, 100); y = linspace(1, 100, 100); [xx,yy] = meshgrid(x, y); [newfreq , newC] = meshgrid(freq, C); z = L .* (newC .* sin(2 .* pi .* newfreq .* xx) + 1); imshow(z, []); shading interp; axis('off')