unit 22 carries out the reverse scramble processing on the individual high frequency components supplied from the separation processing unit 21 the reverse scramble processing is processing of restoring a position of a replaced pixel to its original position based on the random number table as described above by the reverse scramble processing the reverse scramble processing unit 22 supplies the high frequency components in which the pixel positions have been restored to the original positions to the frequency reverse decomposition unit 23 the frequency reverse decomposition unit 23 reversely frequency decomposes the low frequency component supplied from the separation processing unit 21 and the individual high frequency components supplied from the reverse scramble processing unit 22 using a frequency reverse decomposition algorithm used in the wavelet conversion and the like and synthesizes the image data the frequency reverse decomposition unit 23 supplies the synthesized image data to the image output unit 24 the image output unit 24 outputs the image data supplied from the frequency reverse decomposition unit 23 to a display apparatus such as a monitor next a flow of decoding processing in the decoding apparatus 200 will be described fig1 is a flowchart showing the flow of the decoding processing in the decoding apparatus 200 first the reception processing unit 20 receives compressed data transmitted from the encoding apparatus 100 or the switch apparatus step s 20 the received compressed data is supplied to the separation processing unit 21 next the separation processing unit 21 separates the compressed data supplied from the reception processing unit 20 into a low.