KR-102959507-B1 - Invisible Infrared Road Imaging System with Speed Synchronization and Multi-Row Concentrating Structure

Abstract

A non-visible infrared road imaging system equipped with speed synchronization and a multi-row focusing structure can acquire high-resolution road surface images without motion blur even during high-speed driving by synchronizing the vehicle's driving speed with the shooting cycle and simultaneously focusing and individually controlling multi-row arranged LED light sources. The present invention has the effect of securing a clear image that is no different from a stationary state even while driving at high speeds by controlling the light emission time of the lighting unit to be minimized to 7 microseconds by a control unit linked with a wheel encoder. The present invention has the effect of synchronizing image capture whenever a vehicle moves 1 mm, thereby maintaining the actual size ratio of the road surface image at 1:1 regardless of changes in driving speed.

Inventors

• 곽정하

Assignees

• 셀파이엔씨 주식회사

Dates

Publication Date

20260507

Application Date

20260311

Claims (1)

1. In a non-visible infrared road imaging system equipped with speed synchronization and a multi-row concentrating structure, A wheel encoder (120) that generates a distance measurement signal in units of a fixed distance according to the rotational displacement of the vehicle wheel; A main LED array (131) arranged in multiple rows that emits invisible infrared wavelengths; A lighting unit (130) including side LED modules (132) arranged at both left and right ends of the main LED array (131) to reinforce the light intensity of the outer portion; A shooting unit (140) equipped with an infrared bandpass filter to block external light noise and to acquire a road surface image of the illumination area of the lighting unit (130); and It includes a control unit (150) connected to the wheel encoder (120), lighting unit (130), and shooting unit (140) to control the synchronization of the entire system, and The above control unit (150) is, A non-visible infrared road imaging system having a speed synchronization and multi-row concentrating structure, characterized by verifying the illumination uniformity of the lighting unit (130) by comparing the central luminance and outer luminance of the initial image data obtained from the shooting unit (140), setting an allowable travel distance target value to maintain image precision according to the verified illumination uniformity, receiving real-time driving speed information from the wheel encoder (120) to precisely control the duration of the light emission in microseconds so that motion blur of the image is suppressed within the set allowable travel distance, and generating a distance-based synchronization trigger that simultaneously drives the lighting unit (130) and the shooting unit (140) in accordance with the duration of the light emission whenever the vehicle travels the set sampling travel distance.

Description

Invisible Infrared Road Imaging System with Speed Synchronization and Multi-Row Concentrating Structure The present invention relates to a non-visible infrared road imaging system, and more specifically, to a non-visible infrared road imaging system equipped with a speed synchronization and multi-row light-gathering structure capable of acquiring high-resolution road surface images without motion blur even during high-speed driving by synchronizing the driving speed and shooting cycle of a vehicle and simultaneously concentrating and individually controlling LED light sources arranged in multiple rows. Recently, there has been a surge in demand for precise detection of road surface cracks, ice, and hydroplaning to support the advancement of autonomous driving technology and the efficiency of road maintenance. However, existing road survey systems have the following technical limitations. Image distortion caused by speed changes makes it difficult to produce accurate digital maps because the aspect ratio of the images is misaligned when the shooting cycle is fixed while the vehicle accelerates or decelerates. Motion blur during high-speed driving occurs when driving at speeds of 100 km/h or higher, causing the image to spread in the direction of movement with a normal exposure time, making it impossible to read fine defects. Insufficient lighting uniformity can result in the entire width of the road (about 4m or more) not being illuminated evenly, causing the center of the image to be overexposed and noise to occur in the outer areas due to insufficient light, which may reduce the reliability of the analysis. Interference from daytime sunlight cancels out the effects of artificial lighting under strong direct sunlight, making it difficult to obtain consistent data day and night. FIG. 1 is a diagram showing the configuration of an invisible infrared road imaging system having speed synchronization and a multi-row concentrating structure according to an embodiment of the present invention, and FIG. 2 is a drawing showing an example of a lighting unit according to an embodiment of the present invention. Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals. Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Motion blur during high-speed driving occurs when driving at speeds of 100 km/h or higher, causing the image to spread in the direction of movement with a normal exposure time, making it impossible to read fine defects. Insufficient lighting uniformity can result in the entire width of the road (about 4m or more) not being illuminated evenly, causing the center of the image to be overexposed and noise to occur in the outer areas due to insufficient light, which may reduce the reliability of the analysis. To solve these problems, the present invention provides an invisible infrared road imaging system equipped with speed synchronization and a multi-row focusing structure. FIG. 1 is a diagram showing the configuration of a non-visible infrared road imaging system having speed synchronization and a multi-row concentrating structure according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a lighting unit according to an embodiment of the present invention. An invisible infrared road imaging system having speed synchronization and a multi-row concentrating structure according to an embodiment of the present invention may include a wheel encoder (120), an illumination unit (130), a shooting unit (140), and a control unit (150). The wheel encoder (120) can generate a distance measurement signal in units of a certain distance according to the rotational displacement of the vehicle wheel of the vehicle (110). The wheel encoder (120) is mounted on the wheel axle of the vehicle (110) and can convert physical rotational displacement into an electrical signal. The wheel encoder (120) precisely measures the distance traveled while the vehicle (110) is traveling, and the system can generate one trigger pulse (1mm Travel Distance Trigger Pulse) for every 1mm of travel and transmit it to the control unit (150). The lighting unit (130) emits invisible infrared wavelengths and may include a main LED array (131) arranged in multiple rows and side LED modules (132) positioned at both ends of the main LED array (131) to reinforce the light intensity of the outer portion. Th