A method of selecting an accident based on speed profile analysis, by detecting, by a blackbox installed in a vehicle, an impact applied to the vehicle, storing an image before and after impact detection timing (T0) as an impact detection image, and then determining whether the impact detection image is an accident image, the method comprising steps of:
- (a) determining whether a driving speed of the vehicle maintains a reference speed (VTH) or less for a given time in a section between first timing (T1) before the impact detection timing (T0) and second timing (T2) after the impact detection timing (T0);
- (b) determining the impact detection image as an image having a low accident possibility when the driving speed is determined to be greater than the reference speed (VTH) in the step (a);
- (c) determining the impact detection image as an image having a high accident possibility when the driving speed is determined to be equal to or smaller than the reference speed (VTH) in the step (a);
- (d) detecting a deceleration ratio of the vehicle in the section between the first timing (T1) and the second timing (T2) and determining whether i) the deceleration ratio is less than a predetermined safe deceleration ratio (SDR), ii) the deceleration ratio is equal to or greater than the SDR and is equal to or smaller than an accident deceleration ratio (ADR) predetermined as a value greater than the SDR, iii) the deceleration ratio is greater than the ADR;
- (e) re-determining the impact detection image as an image having a low accident possibility again when the determination result of the step (d) indicates that i) the deceleration ratio is less than the SDR or ii) the deceleration ratio is equal to or greater than the SDR and is equal to or smaller than the ADR;
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- (f) determining the impact detection image as an accident image when the determination result of the step (d) indicates that iii) the deceleration ratio is greater than the ADR;
- (g) selecting a sudden deceleration section, in which the vehicle is decelerated most suddenly, among a plurality of division sections obtained by equally dividing the section between the first timing (T1) and the second timing (T2), and determining whether the sudden deceleration section is located i) before the impact detection timing (T0), ii) before and after the impact detection timing (T0) while overlapping the impact detection timing (T0), or iii) after the impact detection timing (T0);
- (h) determining the impact detection image as a first-grade accident image indicative of the highest accident possibility when the determination result of the step (g) indicates that the sudden deceleration section is located i) before the impact detection timing (T0);
- (i) determining the impact detection image as a second-grade accident image indicative of a lower accident possibility than the first-grade accident image when the determination result of the step (g) indicates that the sudden deceleration section is located ii) before and after the impact detection timing (T0) while overlapping the impact detection timing (T0);
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- (j) determining the impact detection image as a third-grade accident image indicative of a lower accident possibility than the second-grade accident image when the determination result of the step (g) indicates that the sudden deceleration section is located iii) after the impact detection timing (T0);
- wherein when determining the impact detection image as the first-grade accident image, the second-grade accident image, or the third-grade accident image, tag information of a corresponding accident grade image is included in the impact detection image, and the impact detection image including the tag information is preserved in a storage medium within the blackbox or moved to a region incapable of being overwritten.