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Re: significance of 'j'
Hi,
To put it more clear, any signal has two thing associated with it 1) it frequency or Time value i.e the characteristic of the signal how it varies it general pattern etc.. 2) the initial value or phase which describes the exact signal. Two represent both in a...
hi abishek_elec,
I had mentioned it in my previous post itself that the periodicity is 0 - 2*pi/T were T the time interval between sampling and since it is constant it is left out.
Regards,
KJN
Hi,
Skipped macroBLock occurs when ever there is no Block coefficients to be encoded in the block. This may occur when there is a perfect prediction from the reference frame or after quantisation there are no block coefficients.
They are skipped since they need not send any extra...
Hi,
It must be seen from fourier transform that when ever you sample a signal (multiplication by a periodic pulse train of period 'T' ) it results in periodic repetition in the frequency domain (convolution of the signal by a periodic pulse train of period '1/T').
Since it is periodic...
Hi,
There are different types of predictions in MPEG standard. One kind is Predicting a frame MB from a Frame picture in which case a single MV is enogh for a MB. But there are cases like Field MB predictions in Frame pictures and Dual Motion Vectors. These prediction cause another type of...
Hi,
In MPEG2 the Picture is divided into slices which inturn into MacroBlocks which inturn into Blocks.
For a 4:2:0 (yuv) format encoding, each macroblock contains 4 blocks of Y (luminance) 1 block of Cr and 1 block of Cb(Chrominance) thus 6 Blocks.
The Coded Block pattern specifies...
Re: interesting on DCT..
HI,
I can try to give some insights. Since this is the maximum variation that can occur it would have peaks at x[0][8] and x[8][0] (if x is the DCT matrix).
Further if the value of white and black are some thing like (+1 and -1) then the DC would be zero. (x[0][0] =...
Hi,
MPEG uses forward pediction and Bi-Prediction to encode picture.
I - No prediction and involves only 8x8 DCT
P - Uses the encoded I frame as its reference frame.( the succesive P i.e in seq. like IP1P2P3...P1 refers I, P2 refers P2 and so on..)
B - requires two reference frames for it -...
octave dsp
Hi,
There are quiet a few books on DSP but u need to know the basics to start of any book. I would recommend "Signals and Systems " by Alan V. Oppenheim . This gives a good start to understand signal processing.
Then if you start DSP by Proakis gives he would go into the depths...
Hi,
Actually DCT is another transform like Fourier transform.In images since it gives good compression it is used. DCT can have any dimension but as I said earlier 8x8 seems to give the maximum for most images (better energy compaction) compared to all dimensions and so it has been used in...
Discrete Cosine transform is used for compression of images (in Jpeg).
there are functions in Matlab which find 1D, 2D dct of input. Since yours is an image u need to use 2D DCT ( dct2()) .
The 2D DCT can be taken on the entire image to get the DCT coefficients of the entire image but since...
Re: Pls recom'd a good DigitalImageProcessing Book for begin
I think one other book was missed out..
Image processing by Castleman. This book was simple and very descriptive on algorithms.
I recommend Anil K Jain, since he is very short and covers more..all you have to do is spend time with it...
It can be as simple as declaring all your variables as int instead of float but many other things need to be taken into account before you proceed doing this.
Like If your program contains multiplications involving decimals less than one then you need to scale them up by some constant factor...
matlab code for gabor filter for edge detection
Hi,
Gabor filters are localised filters i.e they are localised both in time and in frequency. Due to this they are useful in extracting sub-band features in images. But the disadvantage of this filters is that they are not orthogonal implies that...
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