Abstract:
PURPOSE: An effective mode determining method using an adaptive Lagrange multiplier is provided to visually and rapidly encoding due to not adding a Rd-cost by determining a mode using a Mcost. CONSTITUTION: Firstly, a critical value about a 16X16 mode and a 4X4 mode is made. The critical value of 16X16 mode is defined as α and the critical value of 4X4 mode is defined as β. A block is selected as a 16X16 mode and the block is processed such as figure 2 if the block is smaller than a predicted α value. A block is selected as a 4X4 mode and the block is processed such as figure 3 if the block is smaller than a predicted β value.
Abstract:
PURPOSE: An image improvement algorithm device and method thereof are provided not to reduce image quality improvement effect by reducing and removing a side effect which occurs when establishing a picture quality improvement algorithm of an image. CONSTITUTION: A boundary is found by comparing a 2D differential signal characteristic which is obtained through a 2D differential Laplacian of Gaussian classifier and a real space coordination signal characteristic. A slope of a boundary part is optimized. An image signal brightness value of a boundary part through a random parameter delta blocks all kinds of side effects.
Abstract:
An apparatus and a method for determining scan pattern, and an apparatus and a method for encoding image data using the same, and a method for decoding image data using the same are provided to achieve high compression rate by differentiating scan pattern depending on the screen estimation mode. A storage unit(510) stores appearance frequency data. A calculated value counter(520) increases the value corresponding to the target pixel location among the value of prevalence data. An update unit(530) renews the scan pattern corresponding to the estimation mode to be able to scan in the order of the appearance value increases.
Abstract:
A high-speed decoding apparatus for a multi-channel DVR(Digital Video Recorder) system and a method therefor are provided to conduct resolution conversion in a DCT(Discrete Cosine Transform) area without performing the resolution conversion in a pixel area, thereby remarkably reducing complexity of the system. A variable length decoding unit(310) decodes inputted quantized DCT coefficients to output decoded bit streams. An inverse quantization unit(320) inversely quantizes the variable length decoded bit streams to output the inversely quantized bit streams. An IDCT(Inverse DCT) scaler(330) selects a block of the second size from a low-frequency area, which corresponds to a predetermined resolution conversion ratio in a neighboring DCT area of a block of the first size, and conducts IDCT for the selected block of the second size to convert resolution.