Reference no: EM132164753

1. Description

In this assignment, you are going to integrate all your previous assignments. To do so, you should follow the following steps.

1. Read command line arguments
a. -c indicates compression and -d indicates decompression
b. input filename
c. output filename
d. quality (0 - 100); no quality argument for decompression

./compress -c girl.pgm output.dat 50
./compress -d output.dat output.pgm

2. If compression
a. Open and Read the PGM file
b. Divide the data into 8x8 blocks
c. Compute DCT coefficients for each block
d. Write header to the output file (image-width, image-height, quality, channel, and tag)
e. For each block
i. Append the DCT average (round to integer) to the output file
ii. Encode the DCT coefficients (a 8x8 block) using 10 bits (K=10) runlength encoding (Assignment 3)
iii. Append the encoded data to the output file.
f. Repeat step (e) for all 8x8 blocks
g. Close the files and release memory
3. If decompression
a. Open and Read the compressed file
b. Read the header information and return the file position using
ftell(fp)
c. For each block
i. Read the DCT average
ii. Decode the file and restore the data into a 8x8 block
iii. Inverse the DCT coefficient and add the average back to data
d. Convert the 8x8 blocks to a single buffer
e. Write the buffer back to a PGM file.
f. Close the files and release memory

Attachment:- Assignment.rar