* Homomorphic filtering

Homomorphic filtering is a generalized technique for signal and image processing, involving a nonlinear mapping to a different domain in which linear filter techniques are applied, followed by mapping back to the original domain.

Homomorphic filter is sometimes used for image enhancement.

Homomorphic images and subgroups of Noetherian groups are Noetherian, and an extension of a Noetherian group by a Noetherian group is Noetherian.

* Homomorphic Signatures for Network Coding

* The Homomorphic Encryption Project implements the Paillier cryptosystem along with its homomorphic operations.

Unless you want to make your wife a pool widow and to spend a great many of your leisure hours nursing your pool's pristine purity, its care and feeding -- from pH content to filtering and vacuuming -- is best left to a weekly or bi-monthly professional service.

Below this level, the amplifier gain Af is proportional and is of small value, in order to provide adequate noise filtering.

Anisotropic filtering ( AF ) is a method of enhancing the image quality of textures on surfaces that are far away and steeply angled with respect to the point of view.

Older techniques, such as bilinear and trilinear filtering, do not take into account the angle a surface is viewed from, which can result in aliasing or blurring of textures.

* filtering-Equalization is a form of filtering.

It is located outside the cell membrane and provides these cells with structural support and protection, in addition to acting as a filtering mechanism.

If a naive rendering algorithm is used without any filtering, high frequencies in the image function will cause ugly aliasing to be present in the final image.

Content-control software, content filtering software, secure web gateways, censorware, and web filtering software are terms for software designed and optimized for controlling what content is permitted to a reader, especially when it is used to restrict material delivered over the Internet via the Web, e-mail, or other means.

The use of the term censorware in editorials criticizing makers of such software is widespread and covers many different varieties and applications: Xeni Jardin used the term in a 9 March 2006 editorial in the New York Times when discussing the use of American-made filtering software to suppress content in China ; in the same month a high school student used the term to discuss the deployment of such software in his school district.

Browser based filters: Browser based content filtering solution is the most lightweight solution to do the content filtering, and is implemented via a third party browser extension.

Client-side filters: This type of filter is installed as software on each computer where filtering is required.

Network-based filtering: This type of filter is implemented at the transport layer as a transparent proxy, or at the application layer as a web proxy.

Content filtering software can also be used to block malware and other content that is or contains hostile, intrusive, or annoying material including adware, spam, computer viruses, worms, trojan horses, and spyware.

Overblocking: A filter that is overly zealous at filtering content can be described as over blocking.

Underblocking: Whenever new information is uploaded to the Internet, filters can under block content if the parties responsible for maintaining the filters do not update them quickly and accurately, and a blacklisting rather than a whitelisting filtering policy is in place.

A small file is generated that contains a condensed, computer readable digest of this description that can then be used by content filtering software to block or allow that site.

The alpha component may be used to blend to red, green and blue components equally, as in 32-bit RGBA, or, alternatively, there may be three alpha values specified corresponding to each of the primary colors for spectral color filtering.

However, two other terms, censorware and web filtering, while more controversial, are often used.

The two techniques can be used together with the packet filter monitoring a link until it sees an HTTP connection starting to an IP address that has content that needs filtering.

However the general concept of linear filtering is broader, also used in statistics, data analysis, and mechanical engineering among other fields and technologies.

Neodymium and didymium glass are used in color-enhancing filters in indoor photography, particularly in filtering out the yellow hues from incandescent lighting.

Additional filtering and pulse integration modifies the radar equation slightly for pulse-Doppler radar performance, which can be used to increase detection range and reduce transmit power.

These effects were used, in conjunction with other filtering techniques, during World War II as a simple method for speech encryption.

Osmotic pressure is the basis of filtering (" reverse osmosis "), a process commonly used to purify water.

Magic packets are sent via the data link or OSI-2 layer, which can be used or abused by anyone on the same LAN, unless the L2 LAN equipment is capable of ( and configured for ) filtering such traffic to match site-wide security requirements.

Clay is also used in many industrial processes, such as paper making, cement production, and chemical filtering.

For example, a switched analog connection in the telephone network has energy below 300 Hz and above 3400 Hz removed by bandpass filtering ; since the signal has no energy very close to zero frequency, it may not be considered a baseband signal, but in the telephone systems frequency-division multiplexing hierarchy, it is usually treated as a baseband signal, by comparison with the modulated signals used for long-distance transmission.

In some high performance applications, an FPGA or ASIC is used instead of a general purpose microprocessor, or a specialized DSP with specific paralleled architecture for expediting operations such as filtering.

However, some ozone escapes the filtering process in commercial printers, and ozone filters are not used in many smaller consumer printers.

In the workplace, they are used in industrial and scientific processes such as filtering.

One amplifier, the professional audio model DC300 made by Crown International beginning in the 1960s, did not have high-pass filtering at all, and could be used to amplify the DC signal of a common 9-volt battery at the input to supply 18 volts DC in an emergency for mixing console power.

* 1898 — Martinus Beijerinck used filtering experiments to show that tobacco mosaic disease is caused by something smaller than a bacterium, which he names a virus.

Attributes or Metadata can be added to these elements and used for single source publishing or for filtering elements during the output processes ( such as publishing for print or for web-based display ).

The optical filtering devices used have conventionally been etalons, stable solid-state single-frequency Fabry – Pérot interferometers in the form of thin-film-coated optical glass.

The most common processing approach in the time or space domain is enhancement of the input signal through a method called filtering.

The cepstrum is useful in these applications because the low-frequency periodic excitation from the vocal cords and the formant filtering of the vocal tract, which convolve in the time domain and multiply in the frequency domain, are additive and in different regions in the quefrency domain.

Blocking of *. blogspot. com domains by keyword-based Internet filtering systems is also encountered due to the domain containing the substring " gspot.

This form of content filtering is much harder to disguise as the URLs must resolve to a valid domain name.

" The court also wrote that it was five years since the district court had considered the effectiveness of filtering software and that two less-restrictive laws had been passed since COPA, one prohibiting misleading domain names and another creating a child-safe. kids domain, and that given the rapid pace of internet development those might be sufficient to restrict access by minors to specific material.

* that the redirection broke various RFCs and disrupts existing Internet services, such as e-mail relay and filtering ( spam filters were not able to detect the validity of domain names );

Illumination variations can be thought of as a multiplicative noise, and can be reduced by filtering in the log domain.

That is, high-pass filtering is used to suppress low frequencies and amplify high frequencies, in the log-intensity domain.

Such areas of concern to PFIR include spam security, freedom of speech, domain name policy, filtering, and other topics.

This relationship is fundamental to the formulation of other time – frequency distributions which are obtained by a 2-dimensional filtering in the ambiguity domain ( that is, the ambiguity function of the signal ), leading to the definition of a class of TFDs that are better adapted to the signals considered.

It supports simple and domain ( multidrop ) mailboxes, mail filtering via any arbitrary program, and supports a wide variety of mail destination types, including mboxrd, maildir, and external arbitrary mail delivery agents.

All operations that can be performed on an analogue signal such as amplification, filtering, limiting, and others, can also be duplicated in the digital domain.

Terminology concerning the filtering problem may refer to the time domain ( state space ) showing of the signal or to the frequency domain representation of the signal.

When moving in the time domain and mostly under the state space representation of a system, one can have the most general formulation of the nonlinear filtering problem, see also " filtering problem ( stochastic processes )".

The website for the " real " SpamCop is SpamCop. net ; other purported spam filtering providers are using SpamCop. com and other domain names, but do not be confused, these are NOT the original SpamCop.