Front image taking device

Abstract

A front image taking device uses a laser scan device to scan an area in front of an automobile to detect an obstacle and a vector representing its displacement over a period of one frame of the scan is obtained by a signal processor. A camera controller predicts from this vector the position of the obstacle at the time of the next frame and sets an image-taking area. A camera obtains a preliminary image of the area and its brightness histogram is obtained by an image processor. The camera controller adjusts the camera according to the histogram such that an image of the area with optimum brightness and contrast is obtained.

Description

technical field [0001] The present invention relates to a front photographing device for photographing the front of a car, and more particularly to a front photographing device for setting photographing conditions according to the state of a subject. Background technique [0002] Conventionally, in order to ensure the safety of automobiles, lidar is used to detect the distance to the preceding vehicle. The laser radar is used to detect the distance to the preceding vehicle, and when the vehicle is abnormally close to the preceding vehicle, an alarm is issued to remind the driver to pay attention. [0003] Furthermore, in order to further ensure safety, it is preferable to detect not only the distance to the preceding vehicle but also the distance to other objects such as pedestrians. Although LiDAR can detect the distance and direction to an object in a short time, it is difficult to judge whether the object is a car or a pedestrian. [0004] In order to determine the type...

AI Technical Summary

Problems solved by technology

However, the moving speed of the pedestrian is extremely slow compared with the moving speed of the own vehicle. Therefore, when the speed of the own vehicle is fast, the relative movement of the pedestrian is relatively large. Therefore, as shown in FIG. 6(C), the pedestrian is obviously not moving according to the Within the area set in Figure 6(A)

In this case, the optimum aperture value cannot be set

In the device of Patent Document 1, the previous aperture control area is directly used when the preceding vehicle cannot be recognized, so the preceding vehicle is missed

[0011] (3) When photographing a leading car that is dirty with mud, etc., the boundary line between the glass and the body of the car is not clear, or the boundary line between the taillight and the body is not clear

For the photographic image of this car, even if the image processing of edge detection is performed, the boundary cannot be judged because the dividing line is unclear.

Although the aperture control is proposed in the device of Patent Document 1, the aperture control can only adjust the brightness and cannot adjust the contrast

Therefore, in the device of Patent Document 1, edge detection cannot be efficiently performed on objects with unclear boundaries such as dirty cars.

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