Dipan Mehta
  • Member for 10 years, 3 months
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How to Filter Human Speech from an Audio clip?
4 votes

This is not a complete answer, but detection of words from the speech itself is almost always dictionary based - hence one needs to know what words would sound like. If you don't know language, you ...

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How do I compare two resultant images from different binarization algorithms?
4 votes

Thresholding can be treated as one of the basic methods segmentation. In general, to evaluate the segmentation method, one needs to compare it with a ground truth image and identify number of pixels ...

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How do I evaluate the performance of a segmentation algorithm?
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4 votes

Given that you are working only on Tanimoto Coefficient, i am trying to be more specific rather than giving generic answer with various different approaches. The basic notation of Tanimoto ...

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Optimized Ansi C libraries for DSP
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4 votes

Part #1: Regarding the comparison: There is no great general answer to what is a faster alternative to Matlab. It all depends on the platform you use. @Hilmar asnwer indicating features like SIMD ...

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is it possible to matching b / w images without feature extraction steps? if possible which algorithm may be more suitable?
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4 votes

Yes, it is possible! For example, you can take pixel by pixel comparison and apply MSE (mean square error). If the error is close to zero, it is the same picture. However, you will be able to ...

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Simple, streaming, lossless image compression
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4 votes

You can consider using Huffyuv : http://neuron2.net/www.math.berkeley.edu/benrg/huffyuv.html This is no great better than simple zip, but still slightly optimized for images. Any Image related ...

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Checking the "cleanliness" of an image for Optical Character Recognition
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4 votes

Your images are gray-scaled. In order to perform the OCR you might want to first threshold it to apply OCR on the binary image. The effectiveness of the thresholding will definitely affect the ...

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monochrome (1-bit black-and-white) image conversion
4 votes

What you are looking at is called and un-dithering. Theoretically, the problems is ill-posed if you want to reconstruct exact images prior to dithering and printing. However, some linear filtering ...

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How can I compare two pictures from the camera and tell if there are enough differences to detect movement?
4 votes

The "matrix factorization" technique will NOT help you do your job! The paper referred by @mirror2image is about the background subtraction but NOT based on "matrix factorization". Using running ...

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MP3 Filterbank + MDCT: Why?
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3 votes

MP3 is a lossy compression which exploits -psychoacoustic masking. Basically, the human ear has a perception limitations in identifying sounds due to active processing as well as due to non-linear ...

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Video Compression - When would an average of the previous and next I or P frame be useful
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3 votes

Before elaborating anything, i would urge you to go through my answer here that simplifies some of the common confusions prevailing about motion vectors and estimations. Your essential question is - ...

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Counting the number of objects intersected by the image border in MATLAB
3 votes

In my opinion, dilation erosion are very basic tools. You have a very strong information base and quite a decent input image to make such decisions. Here is my view: Given a reasonable success you ...

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Fast approximate optical flow / image shift
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3 votes

Probably if you are looking for a simple method, it is to apply the standard Motion Estimation algorithms which are very much matured in MPEG class of compression codecs. They are easy to understand ...

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Best way of segmenting veins in leaves?
3 votes

Instead of thresholding, i have applied simple edge detection. Used GIMP with Difference of Gaussian - Radious Outer:3.0 and Inner:1.0. Here it is how it looks like. You can further apply a ...

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What would be the best solution to synchronize data from two inputs. (Camera and Acceleration sensors)
3 votes

This is a common problem that most Multimedia systems faces and solves. Basically, closest to the source, there should be one entity (call it originator) that must collect both the data ...

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image feature extraction
3 votes

I may be wrong if i have not understood the question! I am trying to give a rather elementary introduction here. I can refine things and be more rigorous as suited. What you are looking for is that ...

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Get histogram of edge lengths/orientations in an image using OpenCV
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3 votes

I don't know if OpenCV has some implementation - but i can provide you with a pointer of algorithm for this. MPEG 7 provides a fairly well defined (and well thought out) edge histogram descriptor [...

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How do I reconstruct text from an image using only morphological operations?
3 votes

This is quite an interesting problem to solve! Try a median filter. See the reference here and here for more details. Though I haven't put my hands to simulate your problem, this is a suggestion. My ...

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Texture Classification via DCT
3 votes

One of the biggest attraction why one would want to do DCT based texture segmentation/classification (or any other activity) is the fact that most JPEG images and MPEG videos are already in DCT. On ...

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Using the Inverse Filter to Correct a Spatially Convolved Image (Deconvolution)
3 votes

I hope you have not made mistake in the way computation is done for - I convolve the image in the spatial domain with a 5x5 box filter. I FFT the filter, FFT the degraded image, then divide the ...

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Recognizing object of interest in object tracking using Lucas-Kanade method
2 votes

Tracking objects can be simple to complex depending on what type of background you have, whether the background is static or moving, whether the object is clearly distinguishable or can share similar ...

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Fast method to decompress huffman and arithmetic encoded data
2 votes

For actual implementations take a look at (C) programming codes for decoders. Basically the process is simple, you create an abstraction such as bits = get_bits(n) Where, n is the n bits you want ...

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What are characteristics of shadows in an image given an outdoor setting from an image processing point of view?
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2 votes

Shadow has very specific properties that makes it very clear way of making it distinguishable from the regular object. A lot of work in the area of background subtraction and surveillance has been ...

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How to decide whether to use AR or MA for smoothing data?
2 votes

MA (Moving Average) filter is a FIR filter. In general it is given in this form - $$ Y(n) = \sum { w_i * X(n-i) } $$ In inherently it is always stable. AR (Auto regressive) filter is an IIR ...

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Exam Question - end-to-end delay from video capture to video playout
2 votes

The total delay is directly related to minimum delay that needs processing at encoder and decoder before which the first frame is ready to render at the receiver. The process of the transmission and ...

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How to do prediction using frequency domain data?
2 votes

An important NOTE: Since you are talking about frequency domain, it is implied that entire DFT spectrum is available and hence estimation is used for smoothing rather than future prediction. If ...

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Low MIPS Video Encoder
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2 votes

1. Classify whether you need low MIPS or low complexity overall Let me take a small liberty to split this problem in two parts. Low complexity encoding - which allows lower resources (specially in ...

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Good metric for qualitatively comparing image patches
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2 votes

The essential idea is: There is nothing wrong with color information- it is just insufficient. So best thing is to combine multiple feature sets. You can try multiple features to resolve this ...

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How to measure the quality (or difference in quality) of different images?
2 votes

There are very specific metrics for Quality measurement that are used for Image/Video compression. However, i don't think you are looking for that here. Quality here is concerned with ability to ...

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Skip corrupt part of jpeg
2 votes

VLC encoding in any compressed format makes it almost impossible to recover and it is even theoretical impossible to recover. However, most file formats take due care about this. So if you are ...

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