What is image decimation?

Image decimation (or subsampling) is reducing an image's resolution by skipping pixels in rows, columns, or both, to decrease data size and increase frame rates, while keeping the original view, often used in machine vision for faster processing. It's like taking every second pixel (2x decimation) or every fourth pixel (4x decimation) to create a smaller, faster-to-transmit image without changing the scene captured, unlike Region of Interest (ROI).

What is decimation in image processing?

Description of decimation. Decimation is used primarily for the reduction in the number of pixels and the amount of data while retaining the original image area angle and image brightness. Cameras support horizontal, vertical and H+V decimation modes.

What is the purpose of decimation?

Decimation is useful in applications in which the Nyquist frequency of a signal is much higher than the highest frequency of the signal. Decimation filters help you remove the excess bandwidth and reduce the sampling frequency of the signal.

What is an example of a decimation?

For example, a 1x2 decimation would halve the resolution by skipping every second pixel in a row. Other factor combinations are possible, such as 2x2, 2x1, 1x4, ... With color cameras, decimation is possible too and usually applied when the image still is in RAW Bayer format.

What is the concept of decimation?

Decimation is the near-total destruction of a group, like the decimation of the candy bars that your brother was selling for school. Sorry, little brother! Decimation implies that nearly all of a population has been destroyed or killed.

2D Image Downsampling and Upsampling Explained with Examples

What is decimation in 3D modelling?

Decimation is the process of reducing the polygon count of a 3D model while preserving its overall shape and appearance. This can be useful for optimizing models for use in real-time applications such as video games, where a higher polygon count can lead to decreased performance.

What are the disadvantages of decimation?

Using decimation though, does not come without some cost. Some of the disadvantages are more digital logic is required. Using more digital logic will cost more power, and the overall signal bandwidth capability will be reduced.

What is another word for decimation?

Synonyms. STRONGEST. demolition destruction elimination eradication extermination extinction liquidation.

Is decimation still used today?

There is evidence of the punishment's revival in the post-classical world, such as during the Thirty Years' War and World War I. In modern English, the word is used most commonly not to mean a destruction of a tenth but rather annihilation.

What are the effects of decimation?

Decimation is a method of observing only a periodic portion of the ADC samples, while ignoring the rest. The result is to reduce the sample rate of the ADC. For example, a decimate-by-4 mode would mean (total samples)/4, while all other samples are effectively discarded.

Why do people use decimate wrong?

The issue that many people have with the decline and fall of the word decimate is that once upon a time it had a very singular meaning, a meaning that is in danger of being lost forever to the vandals and barbarian hordes who are manhandling the English language through using this word to mean “to destroy a large ...

What is the difference between downsampling and decimation?

The two are similar in spirit. Downsampling for digital signal processing (also known as decimation) is the process of decrementing the bandwidth and sampling rate of the sampler, thus removing some of the original data from the original signal.

How to do decimation?

Decimation consists of the processes of lowpass filtering, followed by downsampling. To implement the filtering part, you can use either FIR or IIR filters. To implement the downsampling part (by a downsampling factor of “M”) simply keep every Mth sample, and throw away the M-1 samples in between.

What are the 4 types of image resolution?

There are four types of resolution to consider for any dataset—radiometric, spatial, spectral, and temporal.

What is the difference between decimation and interpolation?

Decimation is the process of reducing the sample rate Fs in a signal processing system, and interpolation is the opposite, increasing the sample rate Fs in a signal processing system.

Does decimate mean 10%?

The verb decimate originally referred to a form of capital punishment for Roman troops. If there was a rebellion, one out of every ten men (thus the dec in decimate) was put to death. So the word's first expanded usage was to mean a ten percent reduction or a ten percent tax.

What is decimation in 3D modeling?

Decimating a model means reducing its size by reducing the number of polygons in its mesh. This makes the 3D model file size smaller as well as reducing the amount of work that your GPU needs to do to render the model, improving performance.

How does decimation work?

Roman decimation was a brutal punishment for severe military offenses like mutiny or mass desertion, where a unit was divided into groups of ten, and each group drew lots, with the unlucky soldier (the tenth man) being clubbed or stoned to death by his nine comrades, often followed by further harsh penalties like exile and reduced rations, all designed to instill terror and discipline. 

What alternatives to decimation were used?

noun

• destruction.
• devastation.
• extinction.
• havoc.
• loss.
• demolition.
• extermination.
• annihilation.

What is a word for something that has been destroyed?

broken demolished devastated lost ravaged ruined shattered smashed wrecked.

What are 5 strong synonyms?

Some synonyms for strong are:

• Powerful.
• Muscular.
• Mighty.
• Sturdy.
• Durable.
• Tough.
• Rugged.
• Resilient.

What is the difference between decimation and downsampling?

Decimation is the process of reducing the sampling rate of a signal. It involves lowpass filtering to remove frequencies above the Nyquist rate of the new sampling rate, followed by downsampling which throws away some samples. The decimation factor is the ratio of the input rate to output rate.

Is it better to oversample or undersample?

In extreme cases where the number of observations in the rare class(es) is really small, oversampling is better, as you will not lose important information on the distribution of the other classes in the dataset.

What is the difference between real and complex decimation?

In the real decimation modes, you use the process described in “ADC Decimation: Addressing High Data-Throughput Challenges” to simply filter the signals to within the first Nyquist region. In complex decimation modes, you use an NCO for downconversion of the incoming RF signal to baseband before the decimation process.