Multimedia Big Data Computing for IoT Applications by Sudeep Tanwar & Sudhanshu Tyagi & Neeraj Kumar

Author:Sudeep Tanwar & Sudhanshu Tyagi & Neeraj Kumar
Language: eng
Format: epub
ISBN: 9789811387593
Publisher: Springer Singapore

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There are 64 DCT coefficients of the 8 × 8 block: 1 DC coefficient and 63 AC coefficients. The DC coefficient of the entire image contains all available information in that 8 × 8 block image. The 63 AC coefficients are ordered in “zig-zag” form with zero coefficients. Then, all the resultant coefficients are transformed into a code via Huffman coding to reduce the number of bits that are required to represent the coefficients. In this stage, a sufficient amount of compression is realized with an acceptable loss of information, without affecting the quality of the image. Since the pixels that correspond to higher frequency coefficients are discarded in DCT, the quality of the resultant image does not affect the visual nature of the original image.

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