摘要:
The disclosure herein relates to devices for compression, decompression or reconstruction of image data for still or moving pictures, such as image data detected with a digital camera. In some embodiments, data channels are compressed using a scalable compression algorithm. The compression algorithm may allow customization of compression parameters, such as a quantization factor, code block size, number of transform levels, reversible or irreversible compression, a desired compression ratio with a variable bit rate output, a desired fixed bit rate output with a variable compression rate, progression order, output format, or visual weighting. A lower quality image or an image with lower resolution may be reconstructed using only some of the compressed data. Use of offsets to various layers and color channels allow reconstruction of the image without requiring decompression of all of the full image data.
摘要:
A moving-image encoding method and a moving-image decoding method, which can realize a high resolution and a high image quality while suppressing the quantity of data necessary for the high resolution. A moving-image encoding device (100) comprises a first orthogonal transformation unit (102) for discrete cosine transformation of an input image signal (101), a low-pass filter (116) for low-pass filtering the input image signal (101), a down-sampling unit (108) for down-sampling the resolution of a low-pass image signal (117), an encoding unit (110) for compressing and encoding a reduced image signal (109), a local decoding unit (112) for decoding a code train (111), a second orthogonal transformation unit (114) for discrete cosine transformation of an decoded image signal (113), and a correction information generation unit (104) based on an input image DCT coefficient (103) and a decoded image DCT coefficient (115), for generating coefficient correction information (105) to correct the orthogonal transformation coefficient obtained by orthogonally transforming the decoded moving-image signal obtained from the code train.
摘要:
There are provided an image encoding method and an image decoding method capable of improving the image quality of the decoded image while significantly reducing the code Amount. The image encoding method includes an encoding step (S102) for encoding the input image so as to generate a code string including the encoded input image; a decoded image generation step (S104) for decoding the encoded input image so as to generate a decoded image; and a parameter generation step (S106, S108) for performing a processing based on the frequency for at least one of the input image and the decoded image so as to generate a parameter for approximating the decoded image to the input image according to the processing.
摘要:
An image processing apparatus is provided that has a smaller circuit size and flexibly copes with applications having various amounts of additional information. This image processing apparatus that produces data having the additional information added to the encoded data of an image includes: a data processing unit that produces data having a data write area for writing a desired amount of data of the additional information at a predetermined spot in the encoded data of the image; and a data correction unit that writes the data of the additional information in the data write area in the data produced by the data processing unit.
摘要:
In order to control the coding quantity depending on the processing situation at the terminal when decoding or synthesizing plural pictures or sounds simultaneously, the decoding apparatus of the invention comprises a reception control unit 11 for receiving the information, a separation unit 12 for analyzing and separating the received information, a priority decision unit 14 for determining the priority of processing of the pictures separated in the separation unit 12, a picture expanding unit 18 for expanding the pictures according to the determined priority, s picture synthesizing unit 19 for synthesizing the pictures on the basis of the expanded pictures, a synthesis result accumulating unit 22 for accumulating the synthesized pictures, a reproduction time control unit 23 for controlling the time for starting reproduction, and an output unit 24 for delivering the result of synthesis according to the information of the reproduction time control unit 23.
摘要:
Extrapolation judging equipments (1441, 1442) which deal with the head and the end of a data line notify filters for analyzation of returning modes (P, Q) sent from symmetry judging equipments (1431, 1432) and decide appropriate returning modes (P', Q') based on phase shift amounts (dP, dQ) sent from the symmetry judging equipments (1431, 1432) and send the decided returning mode (P', Q') to synthetic filters. In the case that the filters for analyzation are even functions, a zero shift even function returning mode is notified if the absolute value of the phase shift amount is zero and a half shift even function returning mode is notified to the synthetic filters as extrapolation for the synthetic filters if the absolute value of the phase shift amount is D/2. In the case that the filters for analyzation are odd functions, a zero shift odd function returning mode is notified if the absolute value of the phase shift amount is zero, and a half shift odd function returning mode is notified to the synthetic filters as extrapolation for the synthetic filters if the absolute value of the phase shift amount is D/2.
摘要:
A method and apparatus is disclosed for efficiently encoding data representing a video image, thereby reducing the amount of data that must be transferred to a decoder. The method includes transforming data sets utilizing a tensor product wavelet transform (32) which is capable of transmitting remainders from one subband to another. Collections of subbands, in macro-block form (36) are weighted (42), detected (46) and ranked (52) enabling prioritization of the transformed data. A motion compensation technique (56, 60) is performed on the subband data producing motion vectors (58) and prediction errors (68) which are positionally encoded into bit stream packets for transmittal to the decoder. Subband macro-blocks and subband blocks which are equal to zero are identified as such in the bit stream packets to further reduce the amount of data that must be transferred to the decoder.