How do I create a halftoning effect in MATLAB?

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harjan 2011-8-26

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回答： DGM 2022-10-27

How to make an image with halftoning effect that uses 75 lpi?

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Chaowei Chen 2011-8-27

http://www.mathworks.com/matlabcentral/fileexchange/25303-image-halftoning-by-jarvis-method

harjan 2011-8-28

I want AM halftoning metod But Jarvis method is a FM halftoning method

Can u say abt AM method

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Saneem Ahmed 2011-8-28

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check this link http://users.ece.utexas.edu/~bevans/projects/halftoning/toolbox/

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Walter Roberson 2011-8-31

fx and fy would be 400 for a screen or printer frequency of 400 dpi.

I did not attempt to locate a formula relating dpi and lpi with halftoning: it would depend upon what dot shape you were using and upon the cross-angle you were using. What I did is look at the table in that Wikipedia link and then did a linear interpolation between the 300 dpi and 600 dpi figures to estimate the minimum dpi that could handle 85 lpi (since the 600 dpi had 85 lpi as a lower bound, going up over 100 lpi, implying that you would be able to do 85 lpi with a lower dpi.)

harjan 2011-9-2

thx a lot sir...Can you know any reference for that AM halftoning technique......If it is possible kindly send to me...

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DGM 2022-10-27

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在 MATLAB Online 中打开

I'm going to completely ignore the issue of LPI and DPI. Something tells me that 20 people per month don't actually intend to feed this to a printer.

imgscale = 2; % scales the image
htmscale = 7; % scales the map WRT the image
% get an image and prepare it
inpict = imread('peppers.png');
inpict = im2double(rgb2gray(inpict));
inpict = imresize(inpict,imgscale);
% create constant-frequency map
s = size(inpict);
sc = imgscale*htmscale;
[xx yy] = meshgrid(1:s(2),1:s(1));
htm = 0.5*((cos(xx*2*pi./sc).*cos(yy*2*pi./sc))+1);
% perform thresholding
mask = inpict>htm;
% display it
imshow(mask)