Correcting Distortion in an image sequence in realtime
- Slides: 7
Correcting Distortion in an image sequence in real-time IQeye 3 Network Camera • 1. 8 M pixels/sec JPEG • 1/2" 1288 x 968 progressive scan CMOS digital imager • 50 fps (frames per second) at 160 by 120 • 19 fps at 320 by 240 • 5. 4 fps at 640 by 480 • 3. 6 fps at 800 by 600 • 1. 3 fps at 1288 by 968 www. oksolar. com YV 2. 2 x 1. 4 A-SA 2 Lens • Fish-eye vari-focal lens with the horizontal field angle of 185 -94 degrees (when used on 1/3 cameras) www. fujinon. de 9/29/2020 Slide 1/29
Image Sequence Correction Diagram 9/29/2020 Slide 2/29
Wide Angle Camera Calibration • • Image size 312 x 312 Frame rate from camera: 14 fps. Frame rate with distortion correction: 6 fps. Smallest angle-of-view setting (about 80 deg. ) 9/29/2020 Slide 3/29
Wide Angle Camera Calibration • • Image size 312 x 312 Frame rate from camera: 14 fps. Frame rate with distortion correction: 6 fps. Widest angle-of-view setting (185 deg. ) 9/29/2020 Slide 4/29
Wide Angle Camera Calibration • • • Image size 312 x 312 Frame rate from camera: 14 fps. Frame rate with distortion correction: 11 fps. Smallest angle-of-view setting (about 80 deg. ) Black and white image. 9/29/2020 Slide 5/29
Wide Angle Camera Calibration • • • Original Image size 312 x 312 Resotred Image size 428 x 428 Frame rate: 14 fps. Distortion corrected not in real time Smallest angle-of-view setting (about 80 deg. ) 9/29/2020 Slide 6/29
Processing Time Comparison Implementation Clock speed Time (ms) 312 x 312 pixels Pentium 4 with lookup table (color image) 1. 4 GHz 104 434 Pentium 4 with lookup table (black and white image) 1. 4 GHz 36 162 Clock speed Time (ms) 600 x 600 pixels Pentium 4 with lookup table 1. 7 GHz 760 Pentium 4 with real time calculation 1. 7 GHz 780 Various FPGA implementations 10 MHz – 34 MHz 360 -11 Implementation 1* 1* 1* Time (ms) 620 x 620 pixels 1* D. Eadie, F. Shevlin, A, Nisbet “Correction of Geometric Image Distortion Using FPGA’s” SPIE Proceding Opto-Ireland, Vol. 4877, pp. 28 -37, March 2003. 9/29/2020 Slide 7/29
