Nasir Ahmed (engineer)

Nasir AhmedN. Ahmed
Nasir Ahmed (born 1940 in Bangalore, India) is an Indian-American electrical engineer and computer scientist.wikipedia
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Discrete cosine transform

DCTiDCTinverse discrete cosine transform
He is best known for inventing the discrete cosine transform (DCT) in the early 1970s.
The DCT, first proposed by Nasir Ahmed in 1972, is the most widely used transformation technique in signal processing and data compression.

Lossy compression

lossylossy data compressioncompressed
The discrete cosine transform (DCT) is a lossy compression algorithm that was first conceived by Ahmed while working at the Kansas State University, and he proposed the technique to the National Science Foundation in 1972.
The most widely used lossy compression algorithm is the discrete cosine transform (DCT), first published by Nasir Ahmed, T. Natarajan and K. R. Rao in 1974.

Image compression

compressionimagecompressed
The DCT is the most widely used data compression transformation, the basis for most digital media standards (image, video and audio) and commonly used in digital signal processing.
An important development in image data compression was the discrete cosine transform (DCT), a lossy compression technique first proposed by Nasir Ahmed in 1972.

Data compression

compressionvideo compressioncompressed
The DCT is the most widely used data compression transformation, the basis for most digital media standards (image, video and audio) and commonly used in digital signal processing. A DCT variant, the modified discrete cosine transform (MDCT), is used in modern audio compression formats such as MP3, Advanced Audio Coding (AAC), and Vorbis (OGG).
It was first proposed in 1972 by Nasir Ahmed, who then developed a working algorithm with T. Natarajan and K. R. Rao in 1973, before introducing it in January 1974.

JPEG

JPG.jpgJPG/JPEG
It is a core component of the 1992 JPEG image compression technology developed by the JPEG Experts Group working group and standardized jointly by the ITU, ISO and IEC.
The basis for JPEG is the discrete cosine transform (DCT), a lossy image compression technique that was first proposed by Nasir Ahmed in 1972.

Video coding format

video coding standardsvideo codingvideo coding standard
The DCT is the most widely used data compression transformation, the basis for most digital media standards (image, video and audio) and commonly used in digital signal processing.
DCT coding is a lossy block compression transform coding technique that was first proposed by Nasir Ahmed, who initially intended it for image compression, while he was working at Kansas State University in 1972.

Discrete sine transform

DSTsinesine transform(s)
He also described the discrete sine transform (DST), which is related to the DCT.
Both the DCT and the DST were described by Nasir Ahmed T. Natarajan and K.R. Rao in 1974.

Digital media

digital editingdigitalonline media
The DCT is the most widely used data compression transformation, the basis for most digital media standards (image, video and audio) and commonly used in digital signal processing.
The most important compression technique is the discrete cosine transform (DCT), a lossy compression algorithm that was first proposed as an image compression technique by Nasir Ahmed at the University of Texas in 1972.

K. R. Rao

K.R. Rao
Ahmed developed a working DCT algorithm with his PhD student T. Natarajan and friend K. R. Rao in 1973, and they presented their results in a January 1974 paper.
He is credited with the co-invention of discrete cosine transform (DCT), along with Nasir Ahmed and T. Natarajan due to their landmark publication, N. Ahmed, T. Natarajan, and K. R. Rao, "Discrete Cosine Transform", IEEE Transactions on Computers, 90–93, Jan 1974.

MP3

.mp3MP3 downloadMP3 files
A DCT variant, the modified discrete cosine transform (MDCT), is used in modern audio compression formats such as MP3, Advanced Audio Coding (AAC), and Vorbis (OGG).
The discrete cosine transform (DCT), a type of transform coding for lossy compression, was proposed by Nasir Ahmed in 1972, and developed by Ahmed with T. Natarajan and K. R. Rao in 1973, publishing their results in 1974.

Advanced Audio Coding

AACAAC-LCMPEG-4 AAC
A DCT variant, the modified discrete cosine transform (MDCT), is used in modern audio compression formats such as MP3, Advanced Audio Coding (AAC), and Vorbis (OGG).
The discrete cosine transform (DCT), a type of transform coding for lossy compression, was proposed by Nasir Ahmed in 1972, and developed by Ahmed with T. Natarajan and K. R. Rao in 1973, publishing their results in 1974.

Modified discrete cosine transform

MDCTModulated Lapped Transformtime-domain aliasing cancellation
A DCT variant, the modified discrete cosine transform (MDCT), is used in modern audio compression formats such as MP3, Advanced Audio Coding (AAC), and Vorbis (OGG).
The discrete cosine transform (DCT) was first proposed by Nasir Ahmed in 1972, and demonstrated by Ahmed with T. Natarajan and K. R. Rao in 1974.

Digital signal processing

DSPsignal processingdigital
The DCT is the most widely used data compression transformation, the basis for most digital media standards (image, video and audio) and commonly used in digital signal processing.

H.261

The discrete cosine transform (DCT), a form of lossy compression, was first proposed by Nasir Ahmed in 1972.

Moving Picture Experts Group

MPEGMotion Picture Experts GroupMPEG encoding
A tutorial discussion of how it is used to achieve digital video compression in various international standards defined by ITU and MPEG (Moving Picture Experts Group) is available in a paper by K. R. Rao and J. J. Hwang which was published in 1996, and an overview was presented in two 2006 publications by Yao Wang.

Bangalore

BengaluruBangalore, IndiaBangalore, Karnataka
Nasir Ahmed (born 1940 in Bangalore, India) is an Indian-American electrical engineer and computer scientist.

Indian Americans

Indian AmericanIndian-AmericanIndian
Nasir Ahmed (born 1940 in Bangalore, India) is an Indian-American electrical engineer and computer scientist.

Emeritus

professor emeritusEmeritus Professorprofessor emerita
He is Professor Emeritus of Electrical and Computer and Engineering at University of New Mexico (UNM).

University of New Mexico

New MexicoUniversity of New Mexico, AlbuquerqueUNM
He is Professor Emeritus of Electrical and Computer and Engineering at University of New Mexico (UNM).

Kansas State University

Kansas StateKansas State Agricultural CollegeKansas State College
The discrete cosine transform (DCT) is a lossy compression algorithm that was first conceived by Ahmed while working at the Kansas State University, and he proposed the technique to the National Science Foundation in 1972.

National Science Foundation

NSFNational Science Foundation (NSF)U.S. National Science Foundation
The discrete cosine transform (DCT) is a lossy compression algorithm that was first conceived by Ahmed while working at the Kansas State University, and he proposed the technique to the National Science Foundation in 1972.

Joint Photographic Experts Group

JPEGJoint Photography Experts GroupJPEG Experts Group
It is a core component of the 1992 JPEG image compression technology developed by the JPEG Experts Group working group and standardized jointly by the ITU, ISO and IEC.

International Telecommunication Union

ITUInternational Telecommunications UnionInternational Telecommunication Union´s
It is a core component of the 1992 JPEG image compression technology developed by the JPEG Experts Group working group and standardized jointly by the ITU, ISO and IEC. A tutorial discussion of how it is used to achieve digital video compression in various international standards defined by ITU and MPEG (Moving Picture Experts Group) is available in a paper by K. R. Rao and J. J. Hwang which was published in 1996, and an overview was presented in two 2006 publications by Yao Wang.

International Organization for Standardization

ISOISO standardInternational Organisation for Standardisation
It is a core component of the 1992 JPEG image compression technology developed by the JPEG Experts Group working group and standardized jointly by the ITU, ISO and IEC.

International Electrotechnical Commission

IECInternational Electrotechnical Commission (IEC)(IEC)
It is a core component of the 1992 JPEG image compression technology developed by the JPEG Experts Group working group and standardized jointly by the ITU, ISO and IEC.