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Digital Image Processing HW 1

Explore the work flow of opening a bitmap file, converting RGB to YUV, and analyzing histograms. Learn about color components and grading criteria. Includes demo schedule and reference links for practice images.

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Digital Image Processing HW 1

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  1. Digital Image Processing HW1 Yi-Cin DongVisual CommunicationsLaboratoryDepartment of Communication EngineeringNational Central UniversityJhongli, Taiwan Sep. 24, 2009

  2. Outline • Work Flow • Introduction to Bitmap File • Histogram • RGB to YUV Conversion • Grading • Demo Schedule

  3. Work Flow Open bmp file Output I RGB histogram RGB/YUV conversion Output II YUV histogram

  4. Introduction to Bitmap File (1/2)

  5. Introduction to Bitmap File (2/2) 24-bit lena 8-bit lena Header + Color palette 54 bytes Header 54 bytes+ 1024 bytes 512 Image content 512 Image content 512 512

  6. Histogram • R,G,B component • Represent by histogram model Pixel value Frequency Figure1: beatles.bmp Figure2: RGB histogram

  7. RGB to YUV Conversion • Color space • RGB • YUV • Y: luminance • U,V: chrominance • YCbCr • HSI • …

  8. Grading • Demo code: 80% • Open file: 20% • RGB histogram: 30% • YUV histogram: 30% • Report: 20%

  9. Demo Schedule • Thursday night, Oct. 08, 2009 • The detail of demo order will be listed on course website

  10. Reference • Test image • 24-bit color image, 512 512 • lena.bmp • Source website • http://www.indinf.pub.ro/catalinp/proiect/lena512.bmp • Demo images • 24-bit color images, 640 640 • cNebula.bmp and cGolf.bmp • Source website • http://www.ianrichard.com/bpcs/

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