TAILIEUCHUNG - Lecture BSc Multimedia - Chapter 10: Discrete cosine transform

Chapter 10: Discrete cosine transform. This chapter presents the following content: Moving into the frequency domain, fourier transform, what do frequencies mean in an image? The road to compression, low pass image compression example, the discrete cosine transform,. | CM3106 Chapter 10 Discrete Cosine Transform Prof David Marshall and Dr Kirill Sidorov CARDIFF UNIVERSITY PRIFYSCOL CAERDV School of Computer Science Informatics Cardiff University UK Moving into the Frequency Domain Frequency domains can be obtained through the transformation from one time or spatial domain to the other frequency via Fourier Transform FT see Chapter 2 and recall from CM2202 MPEG Audio . Discrete Cosine Transform DCT new Heart of JPEG and MPEG Video MPEG Audio. Note We mention some image and video examples in this section with DCT in particular but also the FT is commonly applied to filter multimedia data. External Link MIT OCW Lecture 11 Fourier Analysis Video CM3106 Chapter 10 DCT Frequency Domain 1 Recap Fourier Transform The tool which converts a spatial real space description of audio image data into one in terms of its frequency components is called the Fourier transform. The new version is usually referred to as the Fourier space description of the data. We then essentially process the data . for filtering basically this means attenuating or setting certain frequencies to zero We then need to convert data back to real audio imagery to use in our applications. The corresponding inverse transformation which turns a Fourier space description back into a real space one is called the inverse Fourier transform. CM3106 Chapter 10 DCT Frequency Domain

• Điện - Điện tử
• BSc Multimedia
• Multimedia applications
• Multimedia data
• Discrete cosine transform
• Fourier transform
• Frequency domain
• Multimedia systems
• Format text
• Multimedia data compression
• Multimedia data basics
• Continuous media
• Digital signals
• Digital audio synthesis
• Digital audio signal processing
• Multimedia data acquisition
• Basic compression algorithms
• Modeling multimedia data
• Information theory
• Digital signal processing
• Digital audio
• Digitising sound
• Digital sampling
• Subtractive synthesis
• Wavetable synthesis
• MPEG 4 audio compression
• MIDI system
• MIDI messages
• Digital audio effects
• Effects types
• Digital audio filtering effects
• Joint Photographic Expert Group
• Quantisation tables
• Differential Pulse Code Modulation
• MPEG video
• Video compression
• Decoding motion of blocks
• MPEG 4 video
• MPEG 4 video compression
• Object based coding
• MPEG audio
• Adaptive predictive coding
• Audio compression
• Content based retrieval
• Image retrieval
• Audio fingerprints