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Create a Simulated Image of Diffraction Limited Spots with Noise 1.0

  Date Added: July 25, 2013  |  Visits: 261

Create a Simulated Image of Diffraction Limited Spots with Noise

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Create images with diffraction-limited spots of varying size and intensity, with noise.Tristan UrsellMarch 2012Create an image with randomly positioned, diffraction-limited spots with full data on actual spot positions and parameters. Useful for testing a spot finding algorithm.[Iout,Inoise,spot_data]=spotmaker([im_sz],num_spots);[Iout,Inoise,spot_data]=spotmaker([im_sz],num_spots,'field',value);im_sz = two column vector specifying the size (rows,columns) of the output image.num_spots = integer value number of spots to appear in the image.Iout = full output image, with spots and noise according to all specified parameters.Inoise = only the noise that appears in Iout.The output 'spot_data' is a structure array with fields: spot_data.Xcent(i) = x-center of the Gaussian spot i. spot_data.Ycent(i) = y-center of the Gaussian spot i. spot_data.ints(i) = peak height (intensity) of the Gaussian spot i. spot_data.stds(i) = peak width (STD) of the Gaussian spot i. length(spot_data.Xcent) = number of spotsThe possible field entries are:'spot_pos' is an optional specification of where the spots should occur in the image. The input should be a two column matrix of X and Y positions. Regardless of the value of 'num_spots', the script will use: num_spots = length(X).'noise_mu' (-Inf < noise_mu < Inf) is the mean intensity of Gaussian noise in the output image. The default value is 0.'noise_std' (0 < noise_std < Inf) is the standard deviation of the Gaussian noise in the output image. The default value is 0.'int_mu' (0 < int_mu < Inf) is the mean spot intensity. The default value is 1. 'int_std' (0 < int_std < Inf) is the standard deviation in spot intensity. The default value is 0.'wid_mu' (0 < wid_mu < Inf) is the mean width of the spot intensity distribution. The default value is 4.'wid_std' (0 < wid_std < Inf) is the standard deviation in the widths of the spot intensity distributions. The default value is 0. 'plot' with value 1 will produce an output plot of Iout with the spot centers marked by red circles.%Simple Example:[Iout,Inoise,spot_data]=spotmaker([400,500],200,'plot',1);%More Complex Example:[Iout,Inoise,spot_data]=spotmaker([400,500],200,'plot',1,'noise_mu',100,...'noise_std',20,'int_mu',100,'int_std',20,'wid_std',1);%Specified Position Example:Xin=linspace(10,400,10)';Yin=linspace(10,300,10)';[Iout,Inoise,spot_data]=spotmaker([320,420],200,'spot_pos',[Xin,Yin],'plot',1,...'noise_mu',100,'noise_std',20,'int_mu',100,'int_std',20,'wid_std',1);%write to 8 bit output image:imwrite(uint8(255*mat2gray(Iout)),'spot_test.tif','Compression','none')

Requirements: No special requirements
Platforms: Matlab
Keyword: Default Input Lengthx Matrix Noise Occur Script
Users rating: 0/10

License: Shareware Size: 10 KB
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CREATE A SIMULATED IMAGE OF DIFFRACTION LIMITED SPOTS WITH NOISE RELATED
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