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Design of Large ICs (5kk53)

Design of Large ICs (5kk53). The application: Image compression G. de Haan. 400 pixels/line. 40 pixels/line. 300 lines. 30 lines. Image = matrix of brightness values. More pixels per image  better resolution  more storage capacity. JPEG principle.

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Design of Large ICs (5kk53)

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  1. Design of Large ICs (5kk53) The application: Image compression G. de Haan GdH

  2. 400 pixels/line 40 pixels/line 300 lines 30 lines Image = matrix of brightness values • More pixels per image  better resolution  more storage capacity GdH

  3. JPEG principle • Multiply pixel matrix with invertible matrix • Result matrix has properties that some entries are more important for image quality than others • Quantize entries that are less important more coarsely Divide image into blocks GdH

  4. 400 pixels/line 400 pixels/line 300 lines 300 lines JPEG compression Data reduced to 20% Data reduced to 10% GdH

  5. 400 pixels/line 40 pixels/line 300 lines 30 lines But if you drive it too far…. Quality with compression factor 100, worse than 100 times less pixels GdH

  6. 2 2 Video compression .bmp .jpg .bmp JPEG encoder JPEG decoder quality GdH

  7. Different qualities of up-scaling Simple bi-linear Advanced content adaptive GdH

  8. Design issues • What is the cost of the various coding options? • Which option gives the best performance? • Define a good price performance point and identify what the choices depend upon GdH

  9. Tools • PaintshopPro • for bmp to jpg with variable compression • Jpgdrc • to convert jpg to bmp • To down-scale images • To linearly up-scale • To up-scale with content adaptive filter (DRC) GdH

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