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DFT to DCT???
Hi
assume that your signal is u(n) for n=0,1,...,N-1
& that DCT{u(n)}=v(k) for k=0,1,...,N-1
now define s(n) such that:
s(n)=u(2n) ]
] for n=0,1,...,N/2 -1
s(N-n-1)=u(2n+1) ]
now it is shown that...
Local peak in Matlab
Hi Nab
I will appreciate if you upload a file containing your data.
(you can use this code to generate it):
%--------------------------------
D=[..];% your data
fid=fopenf('file_name','wt') %open file if not
%available make it...
LZW technique
Hi
i refer you to "digital image processing with MATLAB"
by Gonzalez & Woods
i cant recall # of related chapter ,but its the chapter which discusses IMAGE COMPRESSION.
well i think uploading the book is illegal here.
but you may find it via web for free.(not really legally!!)...
Hi
thanks to Tzushky for his/her deep insight about the problem
I think I have to clarify my last post.
I used the following well known procedure:
1)multipled both numerator & denominator by z^8
2)ordered new numerator & new denominator
3)used only first 2 coefficients of numerator & first...
Hi
I agree with tzushky, original signal contains Low frequency content which caused the drift.
this is the usual case when processing Biomedical signals & low freq. content is due to "MOTION ARTIFACT".
first of all use a LP filter to omit DC of your signal.
the result will have zero...
Local peak in Matlab
Hi
I dont know any simple orders in MATLAB for to find local maxima
but maybe :
FIRST LP YOUR DATA,say D
then:
D=[...] %array of your data
C=der(D) % first derivative of your data
C(C<Th & C>-1*Th)=0 % set zero small values
find(C==0)
the latest order will give you...
Hi
well;there is a simple way,BUT result is different(!)
as you know :
N(z)/D(z)=sum(ai*z-i,i=-infinite:infinite)
i.e. dividing numerator to denominator will give you the coefficients.
Z^8 x (2Z^-8+...)/[Z^7 * (Z^-8+...)]=
(4Z^8 - 2Z^5 +...)/(-4Z^5 + 2Z^3)
4 Z^8 - 2 Z^5 +... |__ -4...
zeros
Hi
well here are some few things I can still remeber(!)
I hope it helps.
in control engineering ,most of times ,
zeros are added to a system to stabilize it;
& to improve transient response of a system.
zeros do not have a simple interpretation just like poles.
also zeros delays the...
Matlab help
hi Ali
passing arguments from function F1 to F2 in MATLAB:
assume that you want to pass variable V1 from F1 to F2
you can declare V1 as a global variable at all places that you use V1:
%-------------------
function ..=F1(...)
..
global V1
V1=5;
...
end
%------------------
and use...
Hi
"Digital Image Processing" by Gonzalez & Woods
is an easy one.
"Fundamentals of Digital Image Processing" by
Anil Jain
is very impressive but a little old. 1989(?)
besides there are many useful links on web
e.g. https://ee.sharif.edu/~miap/
contains good survey papers,which you may...
Hadamard Transform
Hi
WHT : Walsh Hadamard Transform
I have uploaded basis images of WHT for case N=4;
we have 16 ,4x4 basis Hadamard images.
our original 4x4 image is projected on basis images & corresponding WHT coefficient are obtained.
Properties of WHT:
1)WHT is a vary fast transform...
PULSE INTEGRATION
Hi
assume that your deterministic signal say X(t) has a period of T.
and assume that each time you repeat X(t) ,an additive noise is added to X(t) ,say Ni(t) and you will have Yi(t); where i is the index of the corresponding interval and
Yi(t)=X(t)+Ni(t)...
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