摘要:
A method, medium, and apparatus controlling a bit rate in image data encoding. The method for controlling a bit rate in image data encoding includes setting a reference bit amount for encoding a block group composed of a predetermined number of blocks created by dividing image data of a frame, encoding pixel values of the blocks according to a bit depth used to quantize the pixel values of the blocks, checking whether encoding of the frame is completed, and comparing a group bit amount indicating the amount of encoded bits of the block group with the set reference bit amount to adjust the bit depth if encoding of the unit frame is not completed and accordingly repeating the setting of the reference bit amount, encoding pixel values of the blocks, and checking whether encoding of the frame is completed.
摘要:
A display driving apparatus and method using a display device, such as a liquid crystal display device, and a medium for implementing a method of display driving method are provided. The display driving apparatus includes: an encoding unit which compresses and encodes image data to be displayed by the display device; a memory which stores the encoded image data; a memory control unit which stores the encoded image data in the memory and reads the encoded image data from the memory; and a decoding unit which decodes the encoded image data read out from the memory to restore the image data. Input image data is compressed and encoded in units of blocks, and the encoded image data is stored in a memory. Thereafter, the encoded image data stored in the memory is decoded, and the decoded result is output to a display device. Thus, it is possible to reduce the size of a memory included in a display driving apparatus without deteriorating the quality of an image displayed.
摘要:
A method and apparatus for encoding and/or decoding image data. The encoding method includes: if the color space of an image is a single color space, correcting pixel values by applying identical correction pixel values to all color components of a previous image, and if the color space of the image is not a single color space, correcting pixel values by applying different correction pixel values to the color components of the previous image; performing temporal prediction encoding of a current image by using the corrected pixel values of the previous image; quantizing the prediction encoded data; and generating a bitstream by entropy encoding the quantized data. According to the method and apparatus, when the pixel values of a previous image are desired to be corrected in order to perform temporal prediction encoding, different pixel value correction methods are applied according to whether or not the characteristics of color components included in the color space of the image desired to be encoded. By doing so, when image data is encoded, the encoding can be performed adaptively to a variety of color spaces and higher compression efficiency can be maintained.
摘要:
A method, medium, and system encoding/decoding video data using a binary arithmetic coding adaptive to a compression bit rate of the video data. The system may include a bitrate adaptation unit determining a maximum length of a prefix using a compression bitrate of the video data, a binarization unit dividing the video data into a prefix and a suffix according to the determined maximum length of the prefix and binarizing the video data, and an arithmetic encoding unit performing an arithmetic encoding on the binarized video data. The video data may be encoded/decoded using binary arithmetic encoding/decoding by determining the maximum length of the prefix, an order of an exponential Golomb code, and the number of contexts based on the compression bitrate. Accordingly, it is possible to obtain high encoding efficiency regardless of a range of the desired compression bitrate.
摘要:
A display image encoding and/or displaying apparatus, medium, and method. The image encoding apparatus may include a transform unit, a quantizer, a clipper, and an entropy encoder. The transform unit converts image data to generate a transform block and the quantizer quantizes the transform block from the transform unit. The clipper clips some of coefficients contained in the transform block from the quantizer, and the entropy encoder performs dual entropy coding using VLC or FLC on the transform block from the clipper.
摘要:
A color image encoding and/or decoding system, medium, and method using inter-color-component prediction in a frequency domain. To encode an original image, including at least two or more image components, frequency domain transform may be performed with of each component of a color image, color component transform of the frequency domain transform coefficients, in frequency domain, may be performed based on the relationship between transform coefficients of the color image components in order to remove redundant information between color components, performing, and entropy encoding the removed redundant information data. According to the method, medium, and system, a color image or video data can be directly compressed effectively without a conventional color transform process. Furthermore, by using the relationship between image components, redundant information between color components varying with respect to the encoding mode may be removed so that the encoding efficiency can be enhanced.
摘要:
A moving picture coding/decoding method and apparatus with improved coding efficiency. A moving picture coding method includes selecting a color space from among a plurality of color spaces, selecting a prediction mode to be commonly applied to all the color components constituting the selected color space, generating first residual data corresponding to differences between a current picture and a predicted picture for each of the color components according to the selected prediction mode, generating second residual data corresponding to differences between the first residual data, and coding the second residual data.
摘要:
A color image and video encoding and/or decoding apparatus, method, and medium using inter-color-component prediction in accordance with an encoding mode are provided. The encoding apparatus for encoding an original image including at least two color image components, includes: a residue generation unit, if the encoding mode is inter mode, generating a temporal residue by obtaining the difference of a current image and a prediction image obtained by estimating a motion in units of blocks between the current image and a previous image of each color component; a residue color prediction unit encoding the temporal residue of the residue generation unit, by performing residue inter-color-component prediction; an intra color prediction unit, if the encoding mode is intra mode, encoding the original image by performing inter-color-component prediction of the original image; and an entropy encoding unit generating a bitstream by entropy encoding the result value of the residue color prediction unit or the intra color prediction unit. According to the apparatus, method, and medium, a color image or video data can be directly compressed effectively without a conventional color transform process. Furthermore, by using the correlation of image components, redundant information between color components varying with respect to the encoding mode is removed so that the encoding efficiency can be enhanced.
摘要:
A method and apparatus for encoding and decoding image data. The method of encoding image data includes spatially predicting pixel values of a one-dimensional block of an image using blocks spatially adjacent to the one-dimensional block or temporally predicting the pixel values of the one-dimensional block using a temporally previous frame; transforming and quantizing the pixel values of the one-dimensional block; and generating bit streams for a one-dimensional conversion block when the transformed and quantized one-dimensional block is defined as the one-dimensional conversion block. Therefore, since the method and apparatus encode and decode image data in one-dimensional block units, real-time encoding and decoding can be achieved. In addition, compression efficiency can be enhanced while minimizing visual degradation of image quality.
摘要:
An apparatus and a method generate a coded block pattern (CBP) of an alpha channel image. An apparatus and a method encode or decode the alpha channel image using the method. The alpha channel image encoding apparatus includes a CBP generator generating a CBP of a first block corresponding to an encoding unit in the alpha channel image by allocating CBPs to a plurality of second blocks that includes the first block; and a bitstream generator generating a bitstream by encoding the CBP or the CBP and pixel values of the second blocks based on the CBP of each of second blocks.