1. Car speed estimation based on cross-ratio using video data of car-mounted camera (black box) 
Inhwan Han 
Forensic Science International 
Volume 269, Pages (December 2016)
DOI: /j.forsciint
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2. Fig. 1 Projective transformation and cross-ratio.
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3. Fig. 2
Application of cross-ratio method for estimation of a car speed.
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4. Fig. 3
Estimating a travel distance utilizing a portal site (Naver) map.
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5. Fig. 4 Estimating the speed of a car traveling along a straight path.
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6. Fig. 5
Cross ratio and existing method of speed estimation-straight path.
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7. Fig. 6
A chord and an arc.
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8. Fig. 7 A car traveling along a slightly curvilinear path.
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9. Fig. 8
Estimating the speed of a car traveling along a curvilinear path.
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10. Fig. 9
Cross ratio and existing method of speed estimation-curvilinear path.
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11. Fig. 10 A car’s ego-travel along a straight path.
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12. Fig. 11 Estimating a car ego-speed along a straight path.
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13. Fig. 12 Comparison of car ego-speeds along a straight path.
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14. Fig. 13 Estimating a car ego-speed along a curvilinear path.
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15. Fig. 14 Estimating other car speed while driving.
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