Presenter：梁正勳 Number:97662003 SoC Design of An Auto-Focus Driving Image Signal Processor for Mobile Camera Applications Presenter：梁正勳 Number:97662003 VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Outline Introduction Auto Focus Camera System SoC Implementation Experimental Results Conclusions VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Index Terms Image Signal Processor (ISP) Auto Focus(AF) Camera system Voice Coil Motor (VCM) AF lens driver VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

AF mobile phone camera system (b) The proposed AF camera configuration (a) A conventional AF camera configuration VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Auto Focus (AF) Theory (a) The focusing mechanism (b) The focusing algorithm VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C AF lens driver and Lens Lens type Driver type Factors Power consumption AF speed Module Size Cost Stepping motor H-bridge High Slow Big VCM DAC Medium Small Low Piezo motor Fast VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

AF Control Block (AF filter & MCU) AF block diagram AF control flow VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

A detailed VCM lens module (a) AF camera module (b) Focus values (c) AF lens driver outputs VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C AF lens driver Architecture of AF lens driver VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

Shows the architecture Buffer Amplifier VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Chip Design (a) The AF camera module using the AF_ISP (b) The die photo of the AF_ISP VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Experimental Results VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

The results of comparison against other VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Experimental Results (a) defocused image (b) focused image VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

(d) The measured output voltage (c) the measured focus values Experimental Results (d) The measured output voltage of the AF (VCM) driver (c) the measured focus values VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C Conclusions This paper describes an auto-focus driving image signal processor and the AF solution with it. Phone manufacturers are becoming more cost effective and low power consumption. We developed the SoC of an AF driving ISP which has all-in-one AF solution, such as AF statistics, AF control and AF lens driver. In addition, this SoC solution also allows for fast and optimal AF performance of mobile camera applications. VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C

Thank you for your attentions ! The End Thank you for your attentions ! VLSI.Lab.,National Changhua University of Education,Taiwan,R.O.C