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# Tag Info

### Digital Distortion effect algorithm

Thanks to the plot in Olli Niemitalo's answer I got convinced that the formula given in the book has a sign error. The non-linearity used for fuzz or distortion is always some type of smoothed ...

### Precise 5th and 7th harmonics of a sampled sine wave

This answer discusses the harmonic spectra of the quantized sequence in five cases: limit $f/f_s \to 0$, synchronous sampling of a cosine with rational $f/f_s$, synchronous sampling of a sinusoid of ...

### Digital modelling of circuits with diode (i.e. guitar distortion)

One possible tool is Wave Digital Filter analysis which is a type of physical modeling that represents signals as travelling waves. It can also be extended to non-linear elements such as diodes. ...

### Can someone explain waveshaping to me?

In the audio domain, waveshaping is simply applying a memoryless nonlinear function to an input signal. $$y(t) = g\big( x(t) \big)$$ The waveshaping function, $g(x)$, is most often a continuous ...
Accepted

### Looking for pratical quantitative comparison metrics for scaled, delayed and warped Signals

I'm answering the question the way I understood it - How can one find a similarity measure which isn't sensitive to scaling and shifting. An approach could be borrowed from the Computer Vision world ...
Accepted

### Redistributing Color in a RGB Image According to a Gaussian Distribution

After you equalize the histogram you can think of your data as a stream of variables ${X}_{i}$ where $X \sim U \left[ 0, 1 \right]$. Now all you need is to transform samples of Uniform Random ...
Accepted

### Identify the Type of Image Distortion (On Lena Image)

Blur If you want to reverse Blur applied on an image (Using Convolution, namely Linear Spatial Invariant Blur) you should use Deconvolution which, as name suggests, the inverse operation of ...
Accepted

### Digital Distortion effect algorithm

You can write the body of the function directly into Wolfram Alpha and it plots it: It looks like a waveshaper to me, and those can be used as you describe. But there was an error in the formula, see ...

### Algorithm(s) to mix audio signals without clipping

Lower the global volume. Impulse tracker classically outputs channels at about 33% volume max by default. That seems to be both loud enough for music with few channels (4 channel Amiga MODs) and soft ...

### Camera Calibration using Single Input Image

Take a look at this paper here: "Straight lines have to be straight" by Faugeras et al. http://link.springer.com/article/10.1007/PL00013269#page-1 It is straight forward to implement, but essentially ...

### What is done to minimize distortion due to the hold operation?

I agree with Jim Clay's answer, but I think it is important to point out two things. First of all, there are no phase distortions due to the hold operation, just a simple delay of half a sampling ...

### What is done to minimize distortion due to the hold operation?

What you are describing is the distortion introduced by an ideal digital-to-analog converter (DAC) in the analog domain. Two things are typically done to reduce this distortion: Analog filtering ...
Accepted

### Total Harmonic Distortion calculation and its origins

You can create non-linear digital systems (an example would be a system that finds the absolute value of the input). You can also simulate an analog non-linear system using DSP. The easiest way is to ...

### Distances In a Single Image With Some Real References

Well, you can have an approximation. Due to the forms in the image are non regular, completely plain, its hard if not impossible to know the camera distortion. But if you know the size of the wheels ...

### How to estimate radial distortion from lens characteristics?

There is a lot of variability because distortion can be compensated for optically and lens designs differ. Some lenses are marketed as rectilinear, most not. You would be making the distortion worse ...
Accepted

### How to analyze image quality?

You are apparently in the context of no-reference, reference-free or blind image quality assessment. The topic is quite active, and I am not sure people have already a completely accepted framework ...