Abstract: Method and system for adaptive image compression using block characteristics are provided. For adaptive image compression, blocks in an image are quantized and compressed using a quantization table that was used in quantization of the blocks. An image compression system checks a block-characteristics quantization table corresponding to a specific block in the image to be compressed in order to quantize the specific block, and performs calculation using a value of a first element of the quantization table corresponding to a specific element of the specific block and a value of a second element of the checked block-characteristics quantization table corresponding to the specific element in order to quantize the specific element.

Abstract: A method and system for memory management is disclosed. The disclosed method and system can prevent performance degradation due to automatic garbage collection associated with memory allocation for image processing. An image processing program includes two program modules. The first program modules is composed with a first language supporting a garbage collection feature but does not have a direct memory access which may trigger the garbage collection feature. The second program module is composed with a second language lacking the garbage collection feature. The image processing program delegates memory allocation for image processing to the second program module to prevent unnecessary activation of the garbage collection feature.

Abstract: A method and system for image processing is disclosed. An image processing system disposed on a data processing system generates a first thumbnail corresponding to an original image in response to an image display request. The image processing system decodes a first thumbnail in order to display the first thumbnail. The image processing displays the decoded first thumbnail on the data processing system. Region information corresponding to the first thumbnail is generated in the operation of decoding the first thumbnail. The region information indicates locations of a plurality of regions forming the original image.

Abstract: An image processing system and a method thereof is disclosed. A palette including an N number of index pixel values of a processing target image and corresponding index values is created. N is an integer equal to or smaller than 2. An image indexing process is performed on each processing target pixel. When a pixel value of the processing target pixel is a pixel value of one of the N number of index pixel values, a pixel data on a converted image corresponding to the processing target pixel is set as an index value on the palette corresponding to the pixel value of the processing target pixel. Otherwise, the pixel data on the converted image corresponding to the processing target pixel is set as an exceptional value, and the pixel value of the processing target pixel is stored in an exception buffer.

Abstract: Provided are an adaptive image compression system and method. The adaptive image compression method includes a step of determining, at an adaptive image compression system, characteristics of an image that is to be compressed, a step of determining, at the adaptive image compression system, a quantization scale factor based on the characteristics of the image that is to be compressed, a step of generating an adaptive quantization table corresponding to the image that is to be compressed based on the determined quantization scale factor, and a step of encoding the image that is to be compressed using the generated adaptive quantization table.

Abstract: Provided are an apparatus and method for displaying an image in a portable terminal. The apparatus includes a display unit for displaying an image; a display buffer that stores the image to be displayed; a zoom buffer that temporarily stores an enlarged thumbnail to provide a better image quality; a memory that stores an original image of the thumbnail as a compressed image file; an interface unit that upon receiving an image enlargement request while the thumbnail is being displayed on the display unit, enlarges and stores the thumbnail, stored in the display buffer, in the zoom buffer, and sends an image quality improvement request to a decoder that continuously improves the image quality of the enlarged thumbnail stored in the zoom buffer by a predetermined amount.

Abstract: Provided are an adaptive image compression system and method. The adaptive image compression method includes a step of determining, at an adaptive image compression system, characteristics of an image that is to be compressed, a step of determining, at the adaptive image compression system, a quantization scale factor based on the characteristics of the image that is to be compressed, a step of generating an adaptive quantization table corresponding to the image that is to be compressed based on the determined quantization scale factor, and a step of encoding the image that is to be compressed using the generated adaptive quantization table.

Abstract: Provided are an apparatus and a method for saving a memory in a portable terminal, the method includes receiving a request for basic data and an address indicating a storage position of the basic data; determining whether the requested basic data has been stored in a paging buffer; if it is determined that the requested basic data has not been stored in the paging buffer, transforming the address of the requested basic data into an address of a corresponding compressed block using a block address table; searching the compressed basic data for the compressed block corresponding to the address of the compressed block; decompressing the searched compressed block; storing data of the decompressed block in the paging buffer; and returning the requested basic data stored in the paging buffer.

Abstract: A data compression apparatus and method for improving data compression efficiency are provided. The data compression apparatus includes a searcher for calculating costs, by searching domain blocks arranged in forward direction in a search range, between a range block and the domain blocks and for generating distance and difference information, by searching the costs in backward direction, between the range block and the domain block that incurs the lowest cost and a coder for encoding the distance and difference information into compressed data of the range block.

Abstract: Provided are an apparatus and a method for saving a memory in a portable terminal, the method includes receiving a request for basic data and an address indicating a storage position of the basic data; determining whether the requested basic data has been stored in a paging buffer; if it is determined that the requested basic data has not been stored in the paging buffer, transforming the address of the requested basic data into an address of a corresponding compressed block using a block address table; searching the compressed basic data for the compressed block corresponding to the address of the compressed block; decompressing the searched compressed block; storing data of the decompressed block in the paging buffer; and returning the requested basic data stored in the paging buffer.

Abstract: Provided are an apparatus and method for displaying an image in a portable terminal. The apparatus includes a display unit for displaying an image; a display buffer that stores the image to be displayed; a zoom buffer that temporarily stores an enlarged thumbnail to provide a better image quality; a memory that stores an original image of the thumbnail as a compressed image file; an interface unit that upon receiving an image enlargement request while the thumbnail is being displayed on the display unit, enlarges and stores the thumbnail, stored in the display buffer, in the zoom buffer, and sends an image quality improvement request to a decoder that continuously improves the image quality of the enlarged thumbnail stored in the zoom buffer by a predetermined amount.