Patent
Forward discrete cosine transform engine
TLDR
In this article, a fast discrete cosine transform (DCT) method was proposed to perform fast DCT by computing the DCT in five stages using three coefficients, and scaling the outputs using a plurality of scaling coefficients.Abstract:
Systems and methods are disclosed to perform fast discrete cosine transform (DCT) by computing the DCT in five stages using three coefficients, and scaling the outputs using a plurality of scaling coefficients.read more
Citations
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Patent
Efficient implementation of block-based transform on graphics processing unit
Bo Feng,Guobin Shen,Shipeng Li +2 more
TL;DR: In this article, a discrete cosine transform (DCT) and inverse DCT are implemented on a graphics processing unit (GPU) using direct matrix multiplication, such as parallel graphics pipelines, multi-channel capability, and multiple render targets.
Patent
Reduction of errors during computation of inverse discrete cosine transform
Harinath Garudadri,Yuriy Reznik +1 more
TL;DR: In this paper, the authors proposed techniques to reduce rounding errors during computation of discrete cosine transform using fixed-point calculations, where a matrix of scaled coefficients is calculated by multiplying coefficients in a matrix by scale factors.
Patent
Efficient fixed-point approximations of forward and inverse discrete cosine transforms
TL;DR: In this article, the authors describe techniques to approximate computation of an inverse discrete cosine transform using fixed-point calculations, where matrixes of scaled coefficients are generated by multiplying coefficients in matrix of encoded coefficients by scale factors.
Patent
Signalling of maximum dynamic range of inverse discrete cosine transform
TL;DR: In this article, a range indication element is used to indicate the maximum dynamic range of inverse discrete cosine transform (IDCT) output values that may be produced when a set of encoded media data is decoded.
Patent
Transform design with scaled and non-scaled interfaces
Yuriy Reznik,Albert Scott Ludwin,Hyukjune Chung,Harinath Garudadri,Naveen B. Srinivasamurthy,Phoom Sagetong +5 more
TL;DR: In this paper, the authors describe a technique for efficiently performing full and scaled transforms on data received via full-and scaled interfaces, respectively, in a 2D IDCT, which may be implemented in a separable manner with 1D DCTs.
References
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Patent
Discrete cosine transformer
TL;DR: In this article, an improved method and apparatus for calculating discrete cosine transform coefficients from a plurality of digitalized data is described, which utilizes two basic types of circuits arranged in five computational stages.
Patent
High speed cosine transform
TL;DR: In this paper, a discrete transform cosine circuit utilizing symmetries of the cosine matrix of coefficients was proposed to allow all multiplications to be done by "constant multipliers" comprising combinations of look-up tables and adders.
Patent
Jpeg/mpeg decoder-compatible optimized thresholding for image and video signal compression
TL;DR: In this article, a threshold selection for the DCT coefficients of an image or video frame is based on optimizing for minimum distortion for a specified maximum target coding bit rate or, equivalently, for minimized coding bits rate for the specified maximum allowable distortion constraint.
Patent
Image data processing method and apparatus
TL;DR: In this paper, an image data reconstructing appatatus for reconstructing an original image by dividing image data into a plurality of blocks each comprising NXN picture elements, performing two-dimensional orthogonal transform on each of said blocks, quantizing and encoding the result of said transform, decoding the encoded result, dequantizing and twodimensional inverse orthogonality transforming the above result.
Patent
VLSI circuit structure for implementing JPEG image compression standard
TL;DR: In this article, a fully pipelined VLSI image processing structure comprising a DCT module (24) for transforming input video signals to produce DCT output signals, an entropy processing module (26) for receiving the DCT outputs and processing them to produce compressed image data signals, and a timing control means (28) for providing timing control signals at predetermined timing interval to control the processing of the input.