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Nt1310 Unit 5 Algorithm Report

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From the above figure the process of one round MD 5 is given, in which ‘Mi’ represents the 32-bit block of the given input message, then ‘Ki’ represents a 32-bit constant and the ‘<<<=79)

Step 5: Initialization of buffers – Here our SHA-1 algorithm requires either five buffers of words (i.e.) 32 bits or 160 bits. Buffers are as follows,

H0 = 0 × EFCDAB89 H1 = 0 × 67452301 H2 = 0 × 10325476 H3 = 0 × C3D2E1F0 H4 = 0 × 98BADCFE

Step 6: Message processing in 512 bit blocks – There are ‘L’ blocks of total message is present. In this step the SHA-1 algorithm loops through the padded and appended message in 512-bit blocks. We define the input and predefined functions as, …show more content…

Video coding standards are of H.261, MPEG-1, MPEG-2, H.263, MPEG-4, etc,. The main goal of the coding technique will be compression, which minimizes the redundancy that is present in the video file. A video file is comprised of frames (i.e.) separate pictures that are projected one after the other sequentially in the video. Here redundancy is classified into two types such as temporal redundancy and spatial redundancy. Spatial redundancy is defined to the intraframe coding techniques, in which the similar pixels in the frame are encoded. Temporal redundancy is performed with Interframe coding (i.e.) the past and future frames are used for encoding the current frame. Similarly the video compression techniques are also divided into two categories as temporal phase and spatial phase. Temporal phase aims to minimize the temporal redundancies that are present in the video sequence and it exploits all the similarities present between the consecutive frames. In spatial phase the similarities present in the same frame is located and this reduces spatial …show more content…

In Huffman encoding the table is pre-defined by the standard H.261. The pre-defined table involves with motion vectors and quantized Discrete Cosine Transform co-efficient. In some encoding methods, each frame is separately coded for achieving the best result with reduced intraframe redundancy and one more thing is that this will not affect the coding of the other frames present in the video. All the encoding techniques are introduced for achieving higher effectiveness and efficiency in the video compression ratio. Video coding is used for different applications with the standards, they support video conferencing, multimedia distribution, interactive video, etc,. Video coding are broadly classified into four such as, o Lossless Compression o Lossy Compression o Transform Coding o Motion Coding Video file involves with several frames based on the length of the video are movie that is considered. Videos involve with a significant parameter that is frame rate, which is measured in terms of frames per second in short as ‘fps’. Frame rate is defined by both the speed of recording and also the speed of the video playback. A video with frames are also classified into their corresponding types. Video compression involves with different frames such as I-frame that is compressed independently and then P-frame and

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