Topic summary
N. Ahmed
Extracted from the Wikipedia article Nasir Ahmed (engineer).
Discrete cosine transform (DCT)
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. He originally intended the DCT for image compression. 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. It described what is now called the type-II DCT (DCT-II), as well as its inverse, the type-III DCT (a.k.a. IDCT).