Rank: 149 based on 553 downloads (last 30 days) and 21 files submitted
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Santhana Raj

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Files Posted by Santhana Raj View all
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(last 30 days)
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11 Sep 2014 Motion Estimation and Steganography This program does the Motion Estimation analysis and data hiding Author: Santhana Raj video, motion extimation, data hiding, steganography, video compression, video analysis 30 0
10 Sep 2014 Video Reading Frame by frame Reads the video and saves each frames as a png file Author: Santhana Raj video processing, video, frame 19 0
  • 5.0
5.0 | 1 rating
10 Sep 2014 Intra Prediction Re-Construction of Image in a video frame To perform the Intra prediction reconstruction to get the image of a video frame Author: Santhana Raj h264, h264avc, video encoding, decoding, intraprediction, temporal 18 0
10 Sep 2014 Intra Prediction Construction of Image in a video frame To perform the Intra prediction when an image of a video frame is provided Author: Santhana Raj h264, h264avc, video iencoding, intra prediction 11 0
10 Sep 2014 Interprediction Re-Construction of Image in a video frame To perform the Inter prediction reconstruction to get the image of a video frame Author: Santhana Raj h264, h264avc, video decoding, inter prediction, temporal 10 0
Comments and Ratings by Santhana Raj View all
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12 Nov 2014 Approximate Entropy This function computes approximate entropy of a data series. Author: Avinash Parnandi

Hi,
It looks like you are computing the Sample Entropy rather than the Approximate entropy.

I am new to this area and this is what I feel in my first observation. Correct me if I am wrong.

I say it is algorithm of Sample Entropy because you take logarithm of the ratio at the end rather than at the counter itself before calculation Correlation.

10 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Haroldo
It seems that the length of the signal that you took is smaller than 4096. By default, I have taken a 4096 point FFT. So, unless you feed in a signal larger than 4096, the code will throw error.

Possible solutions are that you either pad zeros to your signal or reduce the No of points of the FFT(Variable N in the code)

30 Jul 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

The carrier must be present in the received signal for envelope detection to work. The formula is (1+m(t))*c(t)

Any specific doubts, you can drop me a mail.

30 Jul 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

Am not Fully Sure of the carrier frequency. But I have always assumed it to be the natural frequency of the system, either bearing or the motor itself. But whatever be the case, the carrier frequency is supposed to be very high and a generally a 0.1 cut off frequency would comfortably remove it here.

Hope this helps.

12 Jun 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj

@Chintan

Yep. U guessed right. The shaft speed is about 29Hz.

Thanks for Rating.

Comments and Ratings on Santhana Raj's Files View all
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07 Nov 2014 Discret Wavelet Transform got Daub2 Implements the Daubechies 2 DWT w/o using the inbuilt function Author: Santhana Raj Raed Ibrahim

Thanks

10 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj Santhana Raj

@Haroldo
It seems that the length of the signal that you took is smaller than 4096. By default, I have taken a 4096 point FFT. So, unless you feed in a signal larger than 4096, the code will throw error.

Possible solutions are that you either pad zeros to your signal or reduce the No of points of the FFT(Variable N in the code)

09 Oct 2014 Envelope Detction for Signal Analysis Computes the envelope of the signal by two methods: 1.LPF method 2.Hilbert Transform Author: Santhana Raj Haroldo

"Index exceeds matrix dimensions
Error in envelope (line 46)"

:(

11 Sep 2014 Segmentation of image Input black & white image is converted into segments. Author: Santhana Raj n chow

11 Sep 2014 Video Reading Frame by frame Reads the video and saves each frames as a png file Author: Santhana Raj n chow

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