摘要:
What is disclosed is a method that includes determining the direction of most probable correlation of a transformed set of image data, and error encoding transformed data, the error determined between a transformed data value and a predicted neighbor data value in the determined direction. In an imaging apparatus that employs a DWT, or Discrete Wavelet Transform to compress an image, the direction of edges in the compressed data in used to generate a more highly correlated error image than typically provided for.
摘要:
What is disclosed is an image scaling technique and apparatus. The technique and apparatus utilizes a discrete wavelet transform (DWT). The DWT is applied row-wise to an image, which results in a low frequency sub-band and a high frequency sub-band. The DWT is again applied column-wise to the result of the row-wise DWT. The end result is a 2:1 scaled image. The process may be modified easily to obtain a 4:1 scaled image. Further, the architecture for computing the DWT provides high throughput and is composed, due to the nature of the DWT of address multipliers, registers and delay elements.
摘要:
The invention provides an integrated systolic architecture which can perform both forward and inverse Discrete Wavelet Transforms with a minimum of complexity. A plurality of processing cells, each having an adder and a multiplier, are coupled to a set of multiplexers and delay elements to selectively receive a single input datastream in the forward DWT mode and two datastreams in the inverse DWT mode. In the forward DWT mode, the integrated architecture decomposes the input datastream into two output sequences—a high frequency sub-band output and a low frequency sub-band output. In the inverse DWT mode, the integrated architecture reconstructs the original input sequence by outputting even terms and odd terms on alternating clock cycles. As a result, the architecture can achieve 100% utilization and is suitable to be implemented in VLSI circuitry.
摘要:
What is disclosed is a method that allows a fixed length (L) codeword and flag to serve as a structure for encoding large run of identical values, a single bit capable of representing 2.sup.L such values. The zero non coding method may be utilized to efficiently encode data sets, such as images or other data files with large consecutive runs of a particular value such as zero. In an entropy encoding scheme, such enhanced zero run coding may be combined with variable length coding for non-zero values.
摘要:
Disclosed is a method and apparatus to provide for fingerprint minutiae matching using scoring techniques. A plurality of minutiae in a fingerprint image is defined. A score associated with each minutia corresponding to the validity of each minutia is estimated. The fingerprint image is then matched against one or more sample fingerprint images utilizing a partial point set pattern matching (PSPM) algorithm.
摘要:
A method of converting from a sub-sampled color image in a first color space format to a full color image in a second color space format includes the following. A sub-sampled color image in a first color space format is transformed to a second color space format. At least one color plane of the transformed image is upscaled, the one color plane corresponding to one of the color space dimensions of the second color space format, to provide the full color image in the second color space format. Of course, many other embodiments other than the preceding embodiment are also within the scope of the present invention.
摘要:
Embodiments of a color video coding and decoding scheme are disclosed. In one embodiment, an efficient color coding scheme for color video using three dimensional (3-D) discrete wavelet transforms (DWT) employing correlation among different color components is described. At least one of the color components is coded, and an adjustment to at least some of the remaining color components relative to the coded color component are then coded. This adjustment comprises a partial error adjustment based at least in part on a ratio of color components intensities. Other embodiments, for instance for decoding, are described and claimed.
摘要:
The present disclosure relates to the compression of data and, more particularly, to the compression of video data based at least upon a variable bit rate compression scheme.
摘要:
A computer system includes a memory and a processor. The memory stores a program to cause the processor to provide wavelet coefficients that indicate an image. The processor represent each wavelet coefficient as a collection of ordered bits, and the processor codes the bits of each order to indicate zerotree roots that are associated with the order.
摘要:
A method of locating a half-pixel resolution motion vector. The method first determines a sum of absolute difference for a predetermined number of neighbors to a current pixel. The gradient of these sums of absolute differences is then calculated. A motion vector is then selected based upon the gradient that indicates which vector lies in a direction of steepest descent. This motion vector is then used in motion compensation for video compression.