Abstract: A method and apparatus for performing selective quantization by manipulation of refinement bits is described. In one embodiment, the method comprises performing a refinement coding pass to bit-planes of a code block to create refinement bits and setting refinement bits to the more probable symbol (MPS).

Abstract: A method and apparatus for outputting a codestream as multiple tile-part outputs with packets from tiles being output in each tile-part is described. In one embodiment, the method comprises coding of each tile of an input codestream, outputting packets of each tile as part of an output codestream as a first complete tile-part, storing remaining layers of each tile in a buffer, and outputting additional packets of each tile from the remaining layers as a second complete tile-part.

Abstract: A method and apparatus for eliminating flicker by quantizing values based on previous quantization is described. In one embodiment, the method comprises encoding a first coefficient value in a first frame of a motion sequence and subsequently setting a second coefficient in a second frame of the motion sequence and in the same position as the first coefficient to be within a predetermined closeness with the value of the first coefficient.

Abstract: A system comprising a memory and wavelet processing logic is described. The memory is sized to include lines to store a band of an image and additional lines. The wavelet processing logic comprises a wavelet transform and access logic. The wavelet transform generates coefficients when applied to data in the memory. The access logic reads data from the memory into the line buffers to supply data stored in the memory to the wavelet transform and to store coefficients in the memory, such that after data stored at a first pair of lines is read from memory into the buffers of the access logic. The access logic reuses the first pair of lines to store coefficients generated by the wavelet transform that are associated with a second pair of lines different from the first pair of lines.

Abstract: A method and apparatus for clipping coefficient values after application of each wavelet transform is described. In one embodiment, the method comprises applying an inverse wavelet transform to data repeatedly for a plurality of decomposition levels, and clipping, after each application of the inverse wavelet transform, any value generated as a result of application of the inverse wavelet transform that exceeds a predetermined range associated with that decomposition level subband of the inverse wavelet transform.

Abstract: A wavelet transform filter is disclosed having a pair of line buffers, three pairs of high and low pass filter pairs, two pairs of cascaded delays, and first and second delays, where the second pair of cascade delays is coupled to the first output and has fourth and fifth delay outputs, and a third high pass filter element having inputs coupled to the first output and the fourth and fifth delay output, where the third high pass filter element generates a fifth output of coefficients in the HH subband. A second delay coupled to the fifth output and has a sixth delay output. A third low pass filter element has inputs coupled to the fifth output, the sixth delay output and the fifth delay output and generates a sixth output corresponding to the coefficients in the HL subband.

Abstract: A compression and decompression system in which a reversible wavelet filter are used to generates coefficients from input data, such as image data. The reversible wavelet filter is an efficient transform implemented with integer arithmetic that has exact reconstruction. The present invention uses the reversible wavelet filter in a lossless system (or lossy system) in which an embedded codestream is generated from the coefficients produced by the filter. An entropy coder performs entropy coding on the embedded codestream to produce the compressed data stream.

Abstract: A method and apparatus for decoding information using late contexts is described.

Abstract: A method and apparatus for reformatting electronic documents is disclosed. In one embodiment, the method comprises performing layout analysis on an electronic version of a document to locate text zones, assigning attributes for scale and importance to text zones in the electronic version of the document, and reformatting text in the electronic version of the document based on the attributes to create an image.

Abstract: A compression and decompression system in which a reversible wavelet filter are used to generates coefficients from input data, such as image data. The reversible wavelet filter is an efficient transform implemented with integer arithmetic that has exact reconstruction. The present invention uses the reversible wavelet filter in a lossless system (or lossy system) in which an embedded codestream is generated from the coefficients produced by the filter. An entropy coder performs entropy coding on the embedded codestream to produce the compressed data stream.

Abstract: A method and apparatus for sending additional sideband information in a codestream is described. In one embodiment, the method comprises receiving a JPEG 2000 codestream of compressed image data having sideband information hidden therein and decompressing the codestream based on the sideband information.

Abstract: A method and apparatus for encoding and decoding data that includes generating transformed signals in response to input data. In one embodiment, the transformed signals are generated using a reversible wavelet transform. The present invention also includes a method and apparatus for compressing the transform signals into data representing a losslessly compressed version of the input data. In one embodiment, the present invention decomposes the input data using reversible wavelet transforms.

Abstract: A method and apparatus for encoding and decoding data that includes generating transformed signals in response to input data. In one embodiment, the transformed signals are generated using a reversible wavelet transform. The present invention also includes a method and apparatus for compressing the transform signals into data representing a losslessly compressed version of the input data. In one embodiment, the present invention decomposes the input data using reversible wavelet transforms.

Abstract: A method and apparatus for concealing errors using lower resolution images for compressed images is described. In one embodiment, the method comprises receiving a codestream data of an image and determining a location of an error region in coefficients using an icon.

Abstract: A method and apparatus for selecting layers for quantization based on sideband information is described. In one embodiment, the method comprises receiving a codestream of compressed image data organized in multiple layers. Each of the layers comprises coded data that adds visual value to the image. The method also includes selecting one or more of the layers for quantization based on sideband information accompanying the codestream and decompressing non-quantized layers of the codestream.

Abstract: A method and apparatus for eliminating flicker by quantizing values based on previous quantization is described. In one embodiment, the method comprises encoding a first coefficient value in a first frame of a motion sequence and subsequently setting a second coefficient in a second frame of the motion sequence and in the same position as the first coefficient to be within a predetermined closeness with the value of the first coefficient.

Abstract: A 5,3 wavelet filter is disclosed.

Abstract: A method and apparatus for specifying quantization based upon the human visual system is described. In one embodiment, the method comprises specifying scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting and quantizing bit planes of the luminance information in the image data based on specified scalar quantization.

Abstract: A method and apparatus for performing progressive order conversion is described. In one embodiment, a system comprises a memory and a progressive order conversion parser. The memory stores a compressed image as a codestream in a first progression order and the progression order conversion parser converts the codestream from the first progression order to a second progression order different than the first progression order.

Abstract: A method and apparatus for editing an image while maintaining codestream size is described. In one embodiment, the method comprises determining a portion of a codestream to edit, decoding the portion of the codestream, performing an edit to the decoded portion of the codestream, recompressing edited data into coded data, and generating a replacement portion for the portion of the codestream by making size of the replacement portion equal to size of the portion of the codestream by adding padding to the replacement tile if the replacement tile is smaller than the portion of the codesteam or quantizing the replacement tile if the replacement tile is larger than the portion of the codestream.