JPEG Image Compression

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JPEG Image Compression presentation given as part of my Undergrad project.

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JPEG Image Compression

  1. 1. JPEG Image Compression BITS GC 331 Computer Projets HemanthKumar Mantri 2004S3P7549
  2. 2. JPEG Image CompressionJPEG: Joint Photographic Experts Group.JPEG: compression algorithm, NOT a file format. The original JPEG format was JFIF and later SPIFF. Current popular choices include C-Cube JFIF; Adobe TIFF/JPEG.4-step process:1. Transforming RGB to YCbCr, separating intensity from color2. Identifying redundant data using a Discrete Cosine Transformation (DCT)3. Quantizing remaining data4. Encoding the result to minimize storage requirements
  3. 3. RGB YCbCr
  4. 4. After DCT After Quantisation
  5. 5. Regenerated from Bits
  6. 6. Inverse Quant. IDCT
  7. 7. YCbCr New RGB New
  8. 8. Original 37.7 KB Regenerated 29.3 KB Difference
  9. 9. Compression performance JPEG: } 10:1 to 20:1 compression without visible loss (effective storage requirement drops to 1-2 bits/pixel) } 30:1 to 50:1 compression with small to moderate visual deterioration } 100:1 compression for low quality applications
  10. 10. That’s all AndThank You

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