Still image decompression method for mobile telephone, involves applying inverse discrete cosine transformation to frequency coefficients, and selecting spatial coefficients with final image pixel values

摘要

#CMT# #/CMT# The method involves assigning a zero value to de-quantized frequency coefficients of a matrix forming de-quantized frequency blocks, and applying an inverse discrete cosine transformation (IDCT) (309) to the coefficients by a wired electronic circuit to obtain de-quantized spatial coefficients. A set of de-quantized spatial coefficients with pixel values of a final image is selected in de-quantized spatial blocks (308-1 - 308-3) to form final spatial blocks (310-1 - 310-3). The final spatial blocks are disposed in the final image at a position relative to a position of initial spatial blocks. #CMT#USE : #/CMT# Used for decompressing a still image compressed according to JPEG format (claimed), to be displayed on a screen of a mobile telephone. #CMT#ADVANTAGE : #/CMT# The method downsizes the image during the decompression process despite a stage of application of the inverse discrete cosine transformation by the wired electronic circuits. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an image decompression method. 152-1 - 152-3 : Quantization tables 156 : Final decompressed image 304-306 : Final images 307-1 - 307-3 : De-quantized frequency blocks 308-1 - 308-3 : De-quantized spatial blocks 309 : Inversed discrete cosine transformation 310-1 - 310-3 : Final spatial blocks.