accuracy of calcDistance(self, boxes) function about vehicle-cv-adas HOT 4 CLOSED

Due to the absence of depth-sensing sensors, distance is roughly estimated through image analysis. Based on the known dimensions of the target object prior to actual driving, distance is calculated using pixel size.

Of course, referring to the actual height and width of the target object is an average.

from vehicle-cv-adas.

Got it. Thanks for explanation.

from vehicle-cv-adas.

Thanks for your explanation. However, The distance detection in my data set doesn't look very accurate. What is the unit of f (focal length)?
And I don't understand the decision condition "ymax <= 650" in the code.

if label in self.object_list and ymax <= 650:
point_x = (xmax + xmin) // 2
point_y = ymax

				try :
					distance = (self.RefSizeDict[label][0] * self.f)/ (ymax - ymin)
					distance = distance/12*0.3048 # 1ft = 0.3048 m
					self.distance_points.append([point_x, point_y, distance])

Looking forward to your reply!

from vehicle-cv-adas.

'ymax <= 650' is just because I use a frame size of (1280, 720), and sometimes it detects the vehicle's own body, leading to a false detection of a vehicle ahead. The focal length is filled in based on the camera's focal length.

from vehicle-cv-adas.