Abstract: Embodiments for performing an indoor navigation are disclosed. The location based service system includes: a plurality of access points installed in an indoor environment and configured to send Wi-Fi signals including access point identification information; a mobile terminal configured to receive a Wi-Fi signal from at least one of the access points and form a first Wi-Fi fingerprint based on the received Wi-Fi signal; and a navigation service server configured to construct a plurality of Wi-Fi radio maps based on a plurality of second Wi-Fi fingerprints acquired at locations of the indoor environment, select a Wi-Fi radio map for estimating a location of the mobile terminal among the plurality of Wi-Fi radio maps, estimate the location the mobile terminal by using a second Wi-Fi fingerprint corresponding to the first Wi-Fi fingerprint based on the selected Wi-Fi radio map, and form location information including the estimated location.

Abstract: A method for motion compensation adaptive image processing, which processes an image data received from an external source, stores the processed image data and restores the stored data to the received image data, the method comprising the steps of analyzing the received image data into image data having relatively high frequency component and relatively low frequency component, compressing/coding the image data having relatively high frequency component and relatively low frequency component by allocating predetermined bits, dividing the compressed/coded image data into a value corresponding to relatively high frequency component and a value corresponding to relatively low frequency component, and decoding the values and restoring the received image data based on the decoded image data.

Abstract: A deinterlacing method based on an edge-directional interpolation in a conversion of video signals of an interlaced scanning format into those of a progressive scanning format, in which the unit of interpolation is extended from the unit of one pixel to the unit of one pixel group. An intermediate frame video is formed from an original interlaced field video. Mismatch values associated Keith edge directions are compared, thereby determining four edge directions exhibiting mismatch values less than those of other edge directions. An interpolation pixel value is calculated, using the intermediate video frame, indices of the four edge directions, and indices of the edge directions. A determination is made based on similarities of the four edge directions, differences among the less mismatch values associated with the four edge directions, and differences of the less mismatch values from mismatch values associated with the remaining edge directions.

Abstract: Disclosed is a motion-compensated interpolation (MCI)-based deinterlacing method for converting video signals of an interlaced scanning format into those of a progressive scanning format. The deinterlacing method involves a motion vector estimation step, a video signal deinterlacing step, a deinterlacing side-effect check step, and a deinterlaced result select step. The motion vector estimation step includes the steps of estimating a motion vector by the unit of a ½ pixel, using the previous frame, the current field, and the future field, and estimating a motion vector by the unit of a ¼ pixel, using the previous frame and the future field. Based oh a motion vector estimated at the motion vector estimation step, the video signal is deinterlaced.

Abstract: Disclosed are a deinterlacing method and apparatus based on a motion-compensated interpolation (MCI) and an edge-directional interpolation (EDI). The disclosed deinterlacing method and apparatus are characterized in that the deinterlacing of a video is conducted using both the MCI and EDI schemes in a single deinterlacing system. An input video signal of an interlaced scan format passes through an MCI block, an EDI block, and a line averaging interpolation (LAI) block, respectively. Respective resultant video signals outputted from the MCI and EDI blocks then pass through MCI and EDI side-effect checking blocks. Based on the checking results outputted from the side-effect checking blocks, a decision and combination block selects a desired one of the MCI, EDI, LAI pixel indices. The decision and combination block selects an output from the MCI block when MCI is superior whereas it selects an output from the EDI block when EDI is superior.

Abstract: A method for storing video frame data in a memory includes the steps of: sequentially receiving the video frame data; dividing the video frame data into a first part and a second part; storing the first part in the memory; storing the second part in the memory while the stored first part is read from the memory for a certain purpose; and reading the second part stored in the memory for the certain purpose.

Abstract: A video decoding device for a TV receiver, e.g., SDTV, decodes a compressed video signal transmitted from a transmitting side and displays the decoded signal. The device includes a first downsampling part for downsampling input data in a unit of block at a predetermined ratio; a display size converting part for dividing the downsampled result into a first group of data and a second group of data and after downsampling the first group of data, for performing screen format conversion for the downsampled first group of data into a display size; a memory for storing each of the converted first group of data and the second group of data; and an output part for downsampling the second group of data to correspond with the first group of data to thereby perform screen format conversion for the downsampled second group of data, when the second group of data is reproduced, and for outputting the first and second groups of data.

Abstract: A method and apparatus for an adaptive quantization control is disclosed. The present invention decomposes one picture into a plurality of blocks, encodes the picture in the block unit and controls quantization by obtaining a first activity from a comparison of the activity of the current block to be encoded and that of the entire blocks; obtaining a second activity from a comparison of motions of neighboring blocks; and controlling the quantization using the first activity if the first activity is below a reference value and using the second activity if the first activity exceeds the reference value.

Abstract: The method and apparatus for eliminating noise in a video signal encoder according to the present invention divides an input video signal into a noise component and a pure video signal component and performs filtering gain control taking account of a rate of energy of the noise and pure signal, thereby performing the exact filtering with respect to an actual noise component and improving picture quality. The present invention also extracts a noise filtered signal component in advance, performs filtering of the remaining signal through gain control, and combines the extracted pure signal component and the filtered remaining signal, thereby eliminating the noise while keeping the resolution of the signal. If the video signal is processed in the unit of blocks, the noise filtering is performed considering this fact, thereby reducing blocking effect and improving picture quality.

Abstract: A decoder for a digital TV receiver is disclosed. The present decoder improves the picture quality of a video signal down converted when an SD class TV receiver receives an HD class video signal. Generally, the decoder receives data in block units, converts a format of the data into a format for display, memorizes the data, processes the memorized data, and displays the processed data by converting the format to include more horizontal color signals than vertical color signals, memorizing and reproducing the data in downsampling the data in block units in a given ratio, and storing the data.

Abstract: A digital image decoding apparatus wherein image coded in accordance with an image coding method adopting the discrete cosine transform (DCT) are decoded without generating blocking picture components. In the apparatus, a data decoder performs the inverted discrete cosine transform (IDCT) for the image data coded in accordance with the coding method adopting the DCT to decode original image data. A selective filter selectively filters the decoded image data from the data decoder, thereby eliminating the blocking picture components.

Abstract: A method for motion compensation adaptive image processing, which processes an image data received from an external source, stores the processed image data and restores the stored data to the received image data, the method comprising the steps of analyzing the received image data into image data having relatively high frequency component and relatively low frequency component, compressing/coding the image data having relatively high frequency component and relatively low frequency component by allocating predetermined bits, dividing the compressed/coded image data into a value corresponding to relatively high frequency component and a value corresponding to relatively low frequency component, and decoding the values and restoring the received image data based on the decoded image data

Abstract: A method for decoding MPEG standard I (Intra-coded) and P (Predictive-coded) picture bit streams using a memory smaller than one video frame of data.