Abstract: A method for codec-based recovery of a video, which includes recovering an image by combining image decoding information and non-overwritten image frames, is provided. The method includes: a cluster extraction step of extracting a pre-cluster region; a region extraction step of extracting, from the pre-cluster region extracted in the cluster extraction step, an M frame region encoded using an MPEG-4 visual codec and an M decoding region; a combining step of combining the M frame region and the M decoding region extracted in the region extraction step and listing the combination; and a recovering step of decoding the M frame region and the M decoding region, listed in the combining step, to be recovered as an image.

Abstract: A method for codec-based recovery of a video, which includes recovering an image by combining image decoding information and non-overwritten image frames, is provided. The method includes: a cluster extraction step of extracting a pre-cluster region; a region extraction step of extracting, from the pre-cluster region extracted in the cluster extraction step, an M frame region encoded using an MPEG-4 visual codec and an M decoding region; a combining step of combining the M frame region and the M decoding region extracted in the region extraction step and listing the combination; and a recovering step of decoding the M frame region and the M decoding region, listed in the combining step, to be recovered as an image.

Abstract: Disclosed herein is a forged seal imprint checking method which includes a step ST-101 of generating a reference seal imprint from a genuine seal (ST-110) and a step ST-121 of comparing a compared seal imprints with the reference seal imprint to calculate characteristic values of the compared seal imprint with respect to the reference seal imprint (ST-140). According to experimental results, forged seal imprints obtained by seals forged by etching a zinc plate or a resin plate can be recognized and forged seal imprints generated by seals forged through computer copy can be also recognized. Accordingly, an objective basis on which it can be determined whether seal imprints on documents are forged in civil and criminal cases can be provided to prevent errors which may be generated when seal imprints are inspected with the naked eyes or microscopes.

Abstract: Disclosed herein is a forged seal imprint checking method which includes a step ST-101 of generating a reference seal imprint from a genuine seal (ST-110) and a step ST-121 of comparing a compared seal imprints with the reference seal imprint to calculate characteristic values of the compared seal imprint with respect to the reference seal imprint (ST-140). According to experimental results, forged seal imprints obtained by seals forged by etching a zinc plate or a resin plate can be recognized and forged seal imprints generated by seals forged through computer copy can be also recognized. Accordingly, an objective basis on which it can be determined whether seal imprints on documents are forged in civil and criminal cases can be provided to prevent errors which may be generated when seal imprints are inspected with the naked eyes or microscopes.

Abstract: Disclosed herein are a method and apparatus for preparing metal nanoparticles using alternating current (AC) electrolysis, in which the yield of metal nanoparticles obtained can be greatly improved by maintaining the concentrations of a reducing agent and a dispersing agent at constant levels in proportion to the intensity of an electric current during the production of the metal nanoparticles.

Abstract: Disclosed is a method of composing images during video communications. The method includes receiving a first image, capturing a second image by an image capture device of a terminal, composing a third image using the first image and the second image, and storing the third image in the terminal.

Abstract: Disclosed is a method of composing images during video communications. The method includes receiving a first image, capturing a second image by an image capture device of a terminal, composing a third image using the first image and the second image, and storing the third image in the terminal.

Abstract: A variable length coding method is provided. The method comprises comparing corresponding portions of a present picture and a previous picture received by a video encoder; and performing coding by fixing a COD (coded macroblock indication) flag of the present picture at a certain value, if said corresponding portions are similar to each other.

Abstract: A method for processing video includes performing two error-detecting steps for a video bit stream. In the first step, the video bit stream is compared a code book. If no error is detected, the second step includes determining whether a discontinuity exists between adjacent macroblocks in the video bit stream. If a discontinuity is detected to exist, error compensation is performed prior to display of the video bit stream. A discontinuity between or among adjacent macroblocks is preferably detected by comparing one or more color values derived from the macroblocks. The color values may include a chrominance value and a luminance value. Difference values derived from the comparisons are measured against respective threshold values and the outcome determines whether a discontinuity exists. A system for processing video includes two detectors for respectively performing the error detecting steps and at least one compensation circuit for compensating the video bit stream for the detected errors.

Abstract: A variable length coding method is provided. The method comprises comparing corresponding portions of a present picture and a previous picture received by a video encoder; and performing coding by fixing a COD (coded macroblock indication) flag of the present picture at a certain value, if said corresponding portions are similar to each other.