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0answers
82 views

Motion and Distortion Estimation using multiple still images?

TL/DR: I'd like to take the median of lots of images to make a single "better" image. The problem is, the camera is slowly moving, and there is significant lens distortion. On the plus side the ...
3
votes
1answer
164 views

Digital Distortion effect algorithm

I read the DAFX book by Udo Zoler about the distortion effect at pages 124-125 and it says that suitable simulation of the distortion is given by the function: ...
0
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0answers
28 views

Power in the image component of an analog IQ demodulator?

For an analog IQ demodulator, is there a closed-form equation that translates gain and phase imbalance to the power in the resulting image?
0
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3answers
142 views

importance of symmetric windows for STFT for practical applications

I am wondering why is the linear phase property of filters with symmetric coefficients important for some practical applications of short time fourier transform, such as image processing? I have read ...
1
vote
1answer
185 views

How to calculate Noise and distortion of an image?

I need to make an application in iphone which needs to calculate noise, geometric deformation other distortions in an image. How to do this? I have done some image processing stuff with opencv + ...
8
votes
2answers
1k views

Add odd/even harmonics to signal?

How do I add odd or even harmonics to a floating point signal? Do I have to use tanh or sin? What I'm trying to do is achieve some very simple distortion effects, but I'm having a hard time finding ...
12
votes
7answers
4k views

Algorithm(s) to mix audio signals without clipping

I'd like to mix two or more PCM audio channels (eg recorded samples) digitally in an acoustically-faithful manner, preferably in near-real-time (meaning little or no peek-ahead). The physically ...
8
votes
2answers
374 views

Is there such a thing as band-limited non-linear distortion?

So if you generate a square wave by just switching a signal between two values, at sample boundaries, it produces an infinite series of harmonics, which alias and produce tones below your fundamental, ...