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ENEE408G: Capstone Design Project: Multimedia Signal Processing Design Project 1:

ENEE408G: Capstone Design Project: Multimedia Signal Processing Design Project 1: Image Processing and Digital Photography. Outline. JPEC-like Codec Matlab Assignment – Common Mistakes Matlab Programming Tasks Announcement. JPEC-like Codec - Encoder. At beginning of the encoder:

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ENEE408G: Capstone Design Project: Multimedia Signal Processing Design Project 1:

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  1. ENEE408G: Capstone Design Project: Multimedia Signal Processing Design Project 1: Image Processing and Digital Photography ENEE408G Spring 2005 Multimedia Signal Processing

  2. Outline • JPEC-like Codec • Matlab Assignment – Common Mistakes • Matlab Programming Tasks • Announcement ENEE408G Spring 2005 Multimedia Signal Processing

  3. JPEC-like Codec - Encoder • At beginning of the encoder: • !del JPEG_Y.jpg JPEG_Cb.jpg JPEG_Cr.jpg • Apply: JPEG_entropy_encode.m three times • After each use: !rename JPEG.jpg JPEG_x.jpg ENEE408G Spring 2005 Multimedia Signal Processing

  4. JPEC-like Codec - Decoder • Apply: JPEG_entropy_decode.m three times • Before each use: !rename JPEG_x.jpg JPEG.jpg • JPEC-like Codec - Demo ENEE408G Spring 2005 Multimedia Signal Processing

  5. Matlab Assignment – Common Mistakes • Wrong Names: • ENEE408G-Assign1, 408G-Assign1 • Problem 1: • Use 8 bits to quantize the hidden message Z • Z = Z/power(2, 8-1) – 1; • sound(Z, fs, 8); • Initialize Z before using for loop • Z = zeros(1, N/8); or Z= zeros(N/8,1); ENEE408G Spring 2005 Multimedia Signal Processing

  6. Matlab Assignment – Common Mistakes • Problem 2 and 3: • Convert uint8 (unsigned 8-bit integers) to double (double-precision) • Im = imread(‘Girl.bmp’); Im = double(Im); • Im = double(imread(‘Girl.bmp’)); • Initialize before using for loop for summation • [H,W] = size(Im); Im_new = zeros(H,W); • Im_new = zeros(size(Im)); • Work on the whole array (vectors, matrices,…) instead of on the individuals (elements). ENEE408G Spring 2005 Multimedia Signal Processing

  7. Matlab Programming Tasks • Two types of Matlab programs: function or script • Scripts do not accept input arguments or return output arguments. They operate on data in the workspace. • Functions can accept input arguments and return output arguments. Internal variables are local to the function. • Example: Im = imread(‘Girl.bmp’); • Should write functions for Matlab programming tasks • JPEC_encoder(filename, blk_size, comp_factor) ENEE408G Spring 2005 Multimedia Signal Processing

  8. Matlab Programming Tasks • A clear program structure with components: • Show the understanding about the implemented system • Easy to integrate the components together between group members • Example: In JPEC_encoder.m • Member1: ImY_DCT = DCT_transformer(ImY, N); • Member1: ImY_Q = quantizer(ImY_DCT, N, comp_factor); ENEE408G Spring 2005 Multimedia Signal Processing

  9. Announcement • Office Hours: • Time: 5pm – 7pm on Thursdays • Place : Jasmine Lab • Design project 1 [I] Report: • Submit to your group’s folder in ECELABS File server • Deadline: 02/18 (next Friday). • 8:45am for section 0102 and • 12:45pm for section 0101 ENEE408G Spring 2005 Multimedia Signal Processing

  10. Announcement • Next Friday (02/18/2005) • Check in : Digital Camera, Pocket PC • Bring your own microphone, earphone, and converter. • Today: Test your Pocket PC programs for the current projects. • Useful Link • VcDemo: Image and Video Compression Tool http://www-ict.its.tudelft.nl/~inald/vcdemo/ • Wotsit’s Multimedia Format Resource http://www.wotsit.org/ ENEE408G Spring 2005 Multimedia Signal Processing

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