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# Gianni Schena

### Univ. Trieste (I)

44 total contributions since 2001

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Submitted

Direct Fourier Reconstruction of a Tomographic Slice
Experiments of reconstruction using Fourier Slice Theorem (rather than filtered back projection).

1 month ago | 17 downloads |

Posted

GPU : existsOnGPU(.)
check if a variable is a gpu variable or not : flag = Undefined function 'existsOnGPU' for input arguments of type 'double...

9 months ago | 741 views

Question

central slice theorem experiments : comparing fft1 of the sinogram to the correspondent section of the fft2 of the phantom image
%This simple script was written to compare the fft1 of one column of the sinogram of one phantom to the %correspondent (ac...

12 months ago | 0 answers | 0

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answers

Posted

pre-allocation of a large structure
anything faster than this ? it seems to take ages size(FV.faces,1)=100000; FaceSFM=cell(size(FV.faces,1),1); [FaceSFM{1:end,1}...

1 year ago | 843 views

Responded

Re: struct2array in 2014 b
MATLAB Version: 8.4.0.150421 (R2014b) MATLAB License Number: 86823 Operating System: Microsoft Windows 7 Enterprise Version 6.1...

3 years ago | 6800 views

Posted

struct2array in 2014 b
Sorry , … where is struct2array gone with the 2014b version ? In earlier versions :

3 years ago | 6800 views

Posted

binary programming - binary lsq
A have a heavily under-determined problem like Ax=b ; x is constrained to be a binary (i.e, 0 or 1) vector and b is experimental...

3 years ago | 1505 views

Posted

Watershed – catchment basin clustering / merging
Watershed – catchment basin clustering-merging Given L=watershed(V); where V is a grey level how to get the neighbour ( i....

4 years ago | 1791 views

Posted

problem saving very large images in matlab
Hi, I experience problems saving large 3d images in matlab ( with radeon HD 7800 graphic card). I use Save-as from File menu....

5 years ago | 2434 views

Posted

graydist bwdist regionprops
Is there any trick to do (say): D=bwdist(~Label3D) Without getting involved in a long time consuming loop : for iobj=1:max_n...

6 years ago | 2739 views

Responded

Re: 3d CT reconstruction
Have a look to iconebeam.m: http://www.mathworks.com/matlabcentral/fileexchange/6032-iconebeam and also to the matlab code feld...

6 years ago | 6197 views

Responded

Re: getframe , addframe
I do something like for k = 1:1000 my_avi=close(...)

6 years ago | 7242 views

Posted

getframe , addframe
this is an old question on newsgroup getframe + addframe used to save an avi file in a long loop slow down the code ... afte...

6 years ago | 7242 views

Posted

C mex and matlab linear indices
I re-edited a section of my matlab code that uses 4D matrices and column vectors of linear indices (sometime referred to as abs...

6 years ago | 1951 views

Responded

Re: subplot - hold on possible conflict ?
close all %temp workaround, genuine fix is needed % long_xb=[]; long_yb=[]; figure(1) for i=1:10 end set(get(AX(1),'YLabel'),'...

6 years ago | 4125 views

Responded

Re: subplot - hold on possible conflict ?
also plotyy has the same strange behaviour %%%%%%%%%%% close all figure(1) for i=1:10 set(H1,'marker','o','color','red') set(...

6 years ago | 4125 views

Responded

Re: subplot - hold on possible conflict ?
Hi , thank you ImAnalyst . your code works fine , but try this statement I think that in order to be more general the subplot ...

6 years ago | 4125 views

Posted

subplot - hold on possible conflict ?
Hi, anyone out there that can tell me how to use properly > hold on< in order to keep both red and blue points in this very basi...

6 years ago | 4125 views

Posted

Matlab 2011a &#8230; Using Built-in Functions on GPUArray
Is there anyone aware of an updated list of MATLAB built-in functions supported by the MATLAB 2011a version for use with GPUArr...

6 years ago | 13527 views

Posted

cornermetrics image pro tbx function
Hi , Is the (gray level) image-curvature transform (often related to corner extraction) calculable with any of the new functio...

7 years ago | 1763 views

Posted

vectorization of recursive 1 line loop
for i = 2 : n end % any way to avoid this loop ? thanks you in advance g

7 years ago | 1236 views

Submitted

immiscible LB
Implements Immiscible Lattice Boltzmann (ILB, D2Q9) method for two phase flows

7 years ago | 6 downloads |

Responded

Re: Volume Mesh from Surface Vertex Data
have a look to the iso2mesh package : iso2mesh: a 3D surface and volumetric mesh generator for matlab/octave iso2mesh in t...

7 years ago | 6734 views

Responded

Re: about CUDA-GPU restriction again
CUDA - GPU On matlab 2010b : restrictions also the impossibility to use array-element indexing ( either natural indeces i,j or ...

7 years ago | 21438 views

Posted

repeat array
what about ... ans =

7 years ago | 4550 views

Responded

Re: memcpy from within matlab
Bruno, Thank you for the advise, No , they are NOT consecutive arrays of integers. Any alternative suggestion ? regards, gianni...

7 years ago | 6100 views

Responded

Re: memcpy from within matlab
Bruno, Thank you for the advise, No , they are NOT consecutive arrays of integers. Any alternative suggestion ? regards, gianni...

7 years ago | 6100 views

Posted

memcpy from within matlab
bottleneck statement : idx1=... idx2=.... A(idx1)=B(idx2); where A and B are predefined 3D arrays, idx1 and idx2 are vectors ...

7 years ago | 6100 views

Submitted

alternative solution to the maze problem with LBMs
An alternative solution to the MAZE problem that uses Lattice Boltzman Methods

7 years ago | 1 download |

Responded

Re: 3D skeleton of a binary image volume
Matthew, it is easy to extract the medial path (rather than the 3d skeleton) have a look to the pictures in : Pore space netwo...

8 years ago | 9103 views

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