Abstract: A method and an apparatus adaptively encode a motion image based on temporal and/or spatial complexity. In the method, encoding is performed with different temporal and spatial resolutions at frame rates based on the temporal and/or spatial complexity of an input image so that image data is stored with high efficiency. The method includes calculating a spatial complexity of input image data, determining a resolution by comparing the calculated spatial complexity with a predetermined threshold, and converting the resolution of the input image data based on the resolution.

Abstract: Methods of encoding and decoding moving images are provided in which noise from an input image is simultaneously encoded and removed. The method of encoding moving images includes selecting a modified multiplication factor table in block units in consideration of noise information of the input image, integer-transforming the input image, and quantizing the input image using the selected modified multiplication factor table. Consequently, the efficiency and performance of compressing moving images can be enhanced.

Abstract: An audio-visual (AV) system and timing method senses the location of a user and provides optimum sound quality. The tuning method for the AV system includes: sensing the location of an electronic apparatus located within a predetermined close distance from a user and calculating the direction and distance from the electronic apparatus to at least one speaker; and by regarding the sensed location of the electronic apparatus as the location of the user and based on the calculated direction and distance information calculated, adjusting the direction and volume of each speaker in order to provide optimum sound quality to the location of the user. Accordingly, with respect to the changing location of the user, optimum sound quality can be provided.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: An inverse transform apparatus included in a moving-image codec, and more particularly, an inverse transform method, apparatus, and medium unrestricted by a size or a type of input data is provided. The inverse transform apparatus included in the moving-image codec may include a plurality of ROM tables separately included according to a format or a size of input data to be referred to in the case of an inverse transform and an inverse transform processor selecting one of the ROM tables according to the format or the size of the input data and performing an inverse transform on the input data. Accordingly, an inverse transform method and apparatus unrestricted by the size or the type of input data is provided. In addition, a multi-format decoder supporting various sizes, such as 8×8, 8×4, 4×8, and 4×4, and various formats, such as VC9 and MPEG-2, can be embodied.

Abstract: There is provided a segment-based pixel processing apparatus and method for effective use of memory. The method includes dividing pixel data within a frame into a plurality of segments in the vertical direction; sequentially pre-processing or post-processing pixel data in a segment among the plurality of segments in line units, and then, sequentially pre-processing or post-processing pixel data in a next segment in line units; and repeating pre-processing or post-processing on pixel data in the other segments in line units until reaching a segment of a predetermined number.

Abstract: A motion estimation method in a hierarchical frame structure, applied to motion picture encoding, the method including, calculating, an initial motion vector of a predetermined block of a current frame at a low resolution with reference to an adjacent frame of the current frame, calculating a reference motion vector using the calculated initial motion vector for motion estimation between the current frame and a reference frame, adjusting a resolution of the calculated reference motion vector to a high resolution, determining a search area within the reference frame based on the adjusted reference motion vector and calculating a final motion vector by performing motion estimation within the determined search area.

Abstract: A method and apparatus to estimate a motion using searched motion vectors, and an image encoding system adopting the method and apparatus are provided. The motion between lower level frame data is estimated to obtain search points with minimum Sum of Absolute Differences (SADs). The search points are used as a based motion vector. Searches are performed on both upper level frame data and upper level field data using the based motion vector and search points are obtained with minimum SADs. The search points obtained from the searches on the upper level frame data and upper level field data are used as frame and field motion vectors.

Abstract: An apparatus and method for variable length coding are provided. The apparatus for variable length coding includes a central processing unit which has a software module programmed in advance for variable length coding in a predetermined method, performs variable length coding of input symbol data by using the software module, and generates variable length code information. The apparatus further includes a bitstream processor which is a separate processor receiving the variable length code information from the central processing unit and generating a bitstream. According to the apparatus and method, modification or addition of a VLC table can be more easily performed through downloading software such that new video data coding standards can be easily supported. Also, by implementing the bitstream processor as a separate dedicated processor and thus implementing variable length coding as a software module, load to the central processing unit is reduced and high speed processing is enabled.

Abstract: A method and apparatus remove noise from video or still image signals by rebuilding video or still image signals received via a communication channel in blocks and converting the blocks into data in the frequency domain. The noise reduction method includes: classifying a received original signal into predetermined size blocks; decomposing a received signal into a predetermined number of equal sized blocks; generating at least one rebuilt signal by removing first predetermined numbers of pixels from the beginning of the decomposed signal and second predetermined numbers of pixels from the end of the decomposed signal; and removing noise in the frequency domain by converting the original signal and the rebuilt signals into signals in the frequency domain. As a result, noise in still image and video signals is effectively removed.

Abstract: A method of and apparatus for adaptively encoding a motion image by using characteristics of the motion image are provided. The method involves (a) calculating temporal complexity of a predetermined section of input image data; (b) determining a frame rate for the predetermined section based on a result of comparing the calculated temporal complexity with a predetermined threshold value; and (c) virtually adjusting a frame rate of the predetermined section based on the determined frame rate.

Abstract: A digital broadcasting signal transmitting apparatus receives a digital broadcasting signal containing a video signal, an audio signal and data of additional information, encodes the digital broadcasting signal, converts into a predetermined transmission type, and transmits the converted signal, and includes a video analyzing portion that determines a bit rate allocated to the video signal and to the data of the additional information in accordance with the input video signal, and then outputs the determined bit rates, a video encoder that encodes the input video signal in accordance with the bit rate allocated to the video signal, and a data formatting portion that receives the data of the additional information as much as the bit rate allocated to the additional information, and then converts the received data into a predetermined data broadcasting format. Accordingly, a considerably increased amount of data of additional information can be transmitted.

Abstract: A method of encoding moving pictures using a plurality of quantization matrices. The method involves selecting one of the plurality of quantization matrices in consideration of an at least one characteristics of an input image; transforming the input image; and quantizing the transformed input image using the selected quantization matrix.

Abstract: A method and apparatus for encoding a video signal with a variable bit rate are provided. The method for encoding the video signal with the variable bit rate includes: (a) calculating a complexity for each of a plurality of pictures on the basis of a bit amount and a quantization parameter of a previous frame; (b) calculating a remaining bit amount for each picture in proportion to the complexity for each picture calculated in (a); (c) calculating a quantization parameter of a current frame on the basis of the complexity for each picture and the remaining bit amount for each picture calculated in (b); and (d) comparing the quantization parameter of the current frame calculated in (c) with a predetermined minimum quantization parameter and determining a final quantization parameter.

Abstract: There is provided a segment-based pixel processing apparatus and method for effective use of memory. The method includes dividing pixel data within a frame into a plurality of segments in the vertical direction; sequentially pre-processing or post-processing pixel data in a segment among the plurality of segments in line units, and then, sequentially pre-processing or post-processing pixel data in a next segment in line units; and repeating pre-processing or post-processing on pixel data in the other segments in line units until reaching a segment of a predetermined number.