tag:www.mathworks.com,2005:/matlabcentral/fileexchange/feedMATLAB Central File Exchangeicon.pnglogo.pngMATLAB Central - File ExchangeUser-contributed code library2014-12-24T23:57:21-05:00226531100tag:www.mathworks.com,2005:FileInfo/488302014-12-21T08:22:51Z2014-12-25T04:33:33ZHelical Ince Gaussian HologramsProduces computer generated Helical Ince Gaussian holograms for spatial light modulators<p>This is a GUI so you'll need both the .fig and .m files together in the same folder. Open the .m file and run to access the GUI. Have fun.
<br />This code was created in 2004 by Dr James Strohaber and is based upon his work in holography. The work also appears in his dissertation If you use this code, cite the author! This code produces computer generated holograms of helical Ince Gaussian modes of the paraxial wave equation. The holograms can be used on spatial light modulators (SLMs). This code requires the subroutines: cart2ellip.m, Cee.m. Ceu.m, See.m, Seu.m, Oeig.m, Eeig.m. Instructions: (1) goto "LCD Specifications" and enter the number of pixels and LCDsize of your SLM. This code assumes the pixel density in both the x and y direction are the same. (2) goto "Input Parameters" and enter the location you wish to same the holograms. (3) Enter the mode numbers, grating constant, modulation depth and waist of the IG beam you wish to create. To use this code as a function, comment all of the Input parameters and uncomment the function command.</p>James Strohaberhttp://www.mathworks.com/matlabcentral/fileexchange/authors/537472MATLAB 8.4 (R2014b)MATLABfalsetag:www.mathworks.com,2005:FileInfo/488442014-12-22T13:04:31Z2014-12-25T04:04:58ZBit-Plane SlicingThis code is used for demonstration of bit-plane slicing<p>This code is used for demonstration of bit-plane slicing. The image given as input is sliced into 8 bit planes and each plane is displayed. Also the original image is reconstructed from these bit planes.</p>Akshay Bhosalehttp://www.mathworks.com/matlabcentral/fileexchange/authors/222499MATLAB 7.6 (R2008a)falsetag:www.mathworks.com,2005:FileInfo/488452014-12-22T13:14:16Z2014-12-25T04:04:22ZContrast StretchingThis code is used for demonstration of Contrast Stretching<p>This code is used for demonstration of Contrast Stretching. In the code the minimum intensity value of pixel of input image is mapped to 0, whereas the maximum intensity value of pixel of input image is mapped to 255. The intermediate values of pixels of input image are proportionally (linearly).</p>Akshay Bhosalehttp://www.mathworks.com/matlabcentral/fileexchange/authors/222499MATLAB 7.14 (R2012a)falsetag:www.mathworks.com,2005:FileInfo/488462014-12-22T13:22:27Z2014-12-25T04:03:32ZIntensity Level Slicing (2-level)This code is used for demonstration of Intensity Level Slicing (2-level)<p>This code is used for demonstration of Intensity Level Slicing (2-level). In this code, the pixels in a particular intensity range, specified by user, are highlighted (255-white) and the pixels out of range are made 0.</p>Akshay Bhosalehttp://www.mathworks.com/matlabcentral/fileexchange/authors/222499MATLAB 7.8 (R2009a)falsetag:www.mathworks.com,2005:FileInfo/488472014-12-22T13:27:05Z2014-12-25T04:02:56ZIntensity Level SlicingThis code is used for demonstration of Intensity Level Slicing<p>This code is used for demonstration of Intensity Level Slicing. In this code, the pixels in a particular intensity range, specified by user, are highlighted (255-white) and the pixels out of range are left unchanged.</p>Akshay Bhosalehttp://www.mathworks.com/matlabcentral/fileexchange/authors/222499MATLAB 7.6 (R2008a)falsetag:www.mathworks.com,2005:FileInfo/488692014-12-24T14:54:53Z2014-12-25T04:01:58ZHistogram EquilizationThis code is used for demonstration of Histogram Equilization<p>In this code an image is read and the histogram of this image is plotted. Then the process of histogram equalization is applied on original image and then transformed image and its histogram are plotted.</p>Akshay Bhosalehttp://www.mathworks.com/matlabcentral/fileexchange/authors/222499MATLAB 7.12 (R2011a)falsetag:www.mathworks.com,2005:FileInfo/488512014-12-22T20:41:28Z2014-12-25T02:57:17ZBessel Beam HologramsProduces computer generated Bessel Beam holograms for spatial light modulators<p>This is a GUI so you'll need both the .fig and .m files together in the same folder. Open the .m file and run to access the GUI. Have fun.
<br />This code was created in 2004 by Dr James Strohaber and is based upon his work in holography. The work also appears in his dissertation If you use this code, cite the author! This code produces computer generated holograms of Bessel beams of the Helmholtz equation . The holograms can be used on spatial light modulators (SLMs). The equation for the scalar amplitude of a Besssel beam with mode number n, and beam waist w0 is of the form BB(n)~J_n(ar)*exp(i*n*theta) Instructions: (1) goto "LCD Specifications" and enter the number of pixels and LCDsize of your SLM. This code assumes the pixel density in both the x and y direction are the same. (2) goto "Input Parameters" and enter the location you wish to same the holograms. (3) Enter the mode numbers, grating constant, modulation depth and waist of bessel beam you wish to create. To use this code as a function, comment all of the Input parameters and uncomment the function command.</p>James Strohaberhttp://www.mathworks.com/matlabcentral/fileexchange/authors/537472MATLAB 8.4 (R2014b)MATLABfalsetag:www.mathworks.com,2005:FileInfo/488262014-12-21T06:31:49Z2014-12-25T01:58:32ZHelical Laguerre Gaussian HologramsProduces computer generated Helical Laguerre Gaussian holograms for spatial light modulators<p>This is a GUI so you'll need both the .fig and .m files together in the same folder. Open the .m file and run to access the GUI. Have fun.
<br />This code was created in 2004 by Dr James Strohaber and is based upon his work in holography. The work also appears in his dissertation. If you use this code, cite the author! This code produces computer generated holograms of helical Laguerre Gaussian modes of the paraxial wave equation. The holograms can be used on spatial light modulators (SLMs). The equation for the scalar amplitude of a Laguerre Gaussian beam at z=0 with angular mode number L, radial mode number p, and beam waist w0 is LG(L,p)~L(L,p)*(sqrt(2)*r/w0)^(abs(L))*exp(-(r/w0)^2) *exp(iL*theta) . Instructions: (1) goto "LCD Specifications" and enter the number of pixels and LCDsize of your SLM. This code assumes the pixel density in both the x and y direction are the same. (2) goto "Input Parameters" and enter the location you wish to same the holograms. (3) Enter the mode numbers, grating constant, modulation depth and waist of the LG beam you wish to create. To use this code as a function, comment all of the Input parameters and uncomment the function command.</p>James Strohaberhttp://www.mathworks.com/matlabcentral/fileexchange/authors/537472MATLAB 8.4 (R2014b)MATLABfalsetag:www.mathworks.com,2005:FileInfo/488292014-12-21T07:05:23Z2014-12-25T01:01:42ZHermite Gaussian HologramsProduces computer generated Hermite Gaussian holograms for spatial light modulators<p>This is a GUI so you'll need both the .fig and .m files together in the same folder. Open the .m file and run to access the GUI. Have fun.
<br />This code was created in 2004 by Dr James Strohaber and is based upon his work in holography. The work also appears in his dissertation If you use this code, cite the author! This code produces computer generated holograms of the Hermite Gaussian modes of the paraxial wave equation. The holograms can be used on spatial light modulators (SLMs). The equation for the scalar amplitude of a Hermite Gaussian beam at z=0 with mode number n and m and beam waist w0 is HG(n,m)=(N_nm)*H_n(sqrt(2)x/w0)H_m(sqrt(2)y/w0)exp(-(r/w0)^2), where N_nm is a normalization constant Instructions: (1) goto "LCD Specifications" and enter the number of pixels and LCDsize of your SLM. This code assumes the pixel density in both the x and y direction are the same. (2) goto "Input Parameters" and enter the location you wish to same the holograms. (3) Enter the mode numbers, grating constant, modulation depth and waist of the HG beam you wish to create. To use this code as a function, comment all of the Input parameters and uncomment the function command.</p>James Strohaberhttp://www.mathworks.com/matlabcentral/fileexchange/authors/537472MATLAB 8.4 (R2014b)MATLABfalsetag:www.mathworks.com,2005:FileInfo/488652014-12-24T02:58:21Z2014-12-24T20:17:31ZReversible Watermarking Algorithm Using Sorting and PredictionReversible Watermarking Algorithm Using Sorting and Prediction<p>This paper presents a reversible or lossless watermarking
<br />algorithm for images without using a location map in
<br />most cases. This algorithm employs prediction errors to embed
<br />data into an image. A sorting technique is used to record the
<br />prediction errors based on magnitude of its local variance. Using
<br />sorted prediction errors and, if needed, though rarely, a reduced
<br />size location map allows us to embed more data into the image
<br />with less distortion. The performance of the proposed reversible
<br />watermarking scheme is evaluated using different images and
<br />compared with four methods: those of Kamstra and Heijmans,
<br />Thodi and Rodriguez, and Lee et al. The results clearly indicate
<br />that the proposed scheme can embed more data with less
<br />distortion.</p>mongkolhttp://www.mathworks.com/matlabcentral/fileexchange/authors/461293MATLAB 7.9 (R2009b)MATLABCommunications System ToolboxMATLABCommunications System Toolboxfalse