Abstract: Disclosed is a discrete wavelet transform (DWT) unit for encoding and decoding still images based on the energy of each block. The DWT unit includes an energy calculating section for calculating energy of an input image in unit of a block having a predetermined number of pixels, an image decomposing section for performing three-level decomposition of the image of the block by decomposing a band at which a low frequency component is distributed three times, and a coefficient substituting section for substituting 0 (zero) for bands at which a high frequency component is distributed among the three-level decomposed bands.

Abstract: Provided is a method and apparatus for photographing an object to produce a still image while recording a moving picture.

Abstract: An MPEG-4 encoder utilizing an H.263 multimedia chip. The MPEG-4 encoder includes a DC (Direct Current) predictor for predicting a DC component of the image frame encoded by an H.263 standard upon receiving a prescribed MPEG-4 quantization value, and an MPEG-4 reconstruction image memory for converting the H.263 reconstruction image into an MPEG-4 reconstruction image, and storing the MPEG-4 reconstruction image. The MPEG-4 encoder removes spatial redundancy from source image data entered in frame units using a prescribed H.263 quantization value, predicts a DC component of an image frame having no spatial redundancy using a prescribed MPEG-4 quantization value, performs a VLC (Variable Length Coding) process on the image frame using the predicted DC component, and outputs the VLC-processed image frame in the form of an MPEG-4 bit stream.

Abstract: An apparatus and method are provided for simultaneously photographing a still image and a motion image in a wireless terminal with at least two cameras. A first camera photographs motion images in motion-image photography mode. A second camera photographs still images in the motion-image photography mode. A controller of the first camera controls the first camera to photograph the motion images in the motion-image photography mode. A controller of the second camera controls the second camera to photograph the still images in the motion-image photography mode. A control unit controls an operation for photographing the motion images through the controller of the first camera in the motion-image photography mode, and controls photographing the still images through the controller of the second camera, and controls an operation for storing the motion/still images photographed in the motion-image photography mode.

Abstract: In a method and an apparatus for bit rate control for image encoding, an entire screen is divided into a high screen quality region and a low screen quality region, a larger number of bits are allocated to the high screen quality region than to the low screen quality region, and the bit rated is controlled according to such allocation. Therefore, the method and the apparatus can provide a screen having areas with different qualities according to a user's setup.

Abstract: Provided is a device and method for taking a still picture and recording a moving picture. The device includes a user interface unit for generating a user input instruction to record the moving picture, and a user input instruction to take the still picture while recording the moving picture; a moving picture recorder for compressing the still pictures into the moving picture, and recording the compressed picture; a camera picture capturing unit for, when there is the user input instruction to take the still picture while recording the moving picture, capturing the still picture; a camera controller for controlling an operation of a camera, and an operation of the camera picture capturing unit; a take-while-record setting unit for storing information on picture-taking; and a controller for generating a signal for controlling to detect the user input instruction to take the still picture while recording the moving picture, and take the still picture while recording the moving picture.

Abstract: A method and apparatus for requesting and providing stored data is provided. The method includes determining whether a data request message is received, searching in stored data for user desired information according to a search condition included in the data request message upon receipt of the data request message, and transmitting the user desired information satisfying the search condition according to a destination included in the data request message.

Abstract: Disclosed is a pipeline-type operation method which can reduce idle operations of hardware modules.

Abstract: An H.263/MPEG video encoder using DCT in a mobile communication terminal. The H.263/MPEG video encoder controls a quantization value using granularity analysis by motion estimation and efficiently controls bit rates. The H.263/MPEG video encoder performs DCT for an input image (N?1), quantizes the input image to output the input image as a video stream, decodes the quantized signal by means of inverse quantization (IQ) and inverse discrete cosine transform (IDCT), and performs motion estimation in comparison with a next input image (N). The H.263/MPEG video encoder includes a granularity analyzing section for analyzing granularity using a result of performing the motion estimation, a granularity control section for controlling a quantization value for the quantization according to an analysis result of the granularity analyzing section, and a frame rate control section for controlling a frame speed of an output of the video stream.

Abstract: An MPEG-4 encoder utilizing an H.263 multimedia chip. The MPEG-4 encoder includes a DC (Direct Current) predictor for predicting a DC component of the image frame encoded by an H.263 standard upon receiving a prescribed MPEG-4 quantization value, and an MPEG-4 reconstruction image memory for converting the H.263 reconstruction image into an MPEG-4 reconstruction image, and storing the MPEG-4 reconstruction image. The MPEG-4 encoder removes spatial redundancy from source image data entered in frame units using a prescribed H.263 quantization value, predicts a DC component of an image frame having no spatial redundancy using a prescribed MPEG-4 quantization value, performs a VLC (Variable Length Coding) process on the image frame using the predicted DC component, and outputs the VLC-processed image frame in the form of an MPEG-4 bit stream.

Abstract: A video encoder differentially encodes an image of a speaker during a visual call. The video encoder comprises a motion estimator for estimating motion of an individual from an input video signal, and calculating a motion vector of the individual; a speaker region detector for detecting a speaker region representing an contour of a speaker from the motion vector; a DCT section for calculating DCT coefficients by DCT-transforming a video signal outputted from the motion estimator; a face region detector for detecting a face region of the speaker from the speaker region based on the DCT coefficients, and generating a differential quantization table by distinguishing the detected face region from non-face regions; an adaptive bit rate controller for differential setting a quantization step size for quantization based on the speaker region; and a quantizer for quantizing the DCT coefficients according to the quantization step size and the differential quantization table.