KR100641401B1 - Three dimensional laser scanner system having multi-heads and video signal processing method thereof - Google Patents

Abstract

A multi-head laser scanner system is provided which eliminates interference of laser output from adjacent scanner heads by using lasers having different wavelengths from adjacent scanner heads and using filters for filtering only the wavelengths of the set lasers. The multi-head laser scanner system includes a laser generator for outputting a laser having a predetermined wavelength band to an object having a three-dimensional shape, a bandpass filter for selectively filtering only lasers in the wavelength band output from the laser generator, and the band It is composed of an imaging module for converting a laser through the pass filter into an electrical image signal, and comprises at least two laser scanner heads positioned around the subject, each of the laser scanning heads output a laser of different wavelengths and is set in advance It is characterized by filtering only the laser of the wavelength.

Multihead, scanner head, stereo scanner, laser wavelength, laser diode.

Description

Multi-head three-dimensional laser scanner system and image signal processing method {THREE DIMENSIONAL LASER SCANNER SYSTEM HAVING MULTI-HEADS AND VIDEO SIGNAL PROCESSING METHOD THEREOF}             

1 is a block diagram of a multi-head three-dimensional laser scanner system according to a preferred embodiment of the present invention.

2 is a block diagram of the laser scanner head shown in FIG. 1;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-head laser scanner system and a control method thereof. In particular, an interference of a laser output beam from a neighboring laser scanner head when a subject is scanned with a plurality of laser scanner heads is disclosed. The present invention relates to a multi-head laser scanner system and a video signal processing method having a structure that eliminates a phenomenon to more quickly acquire and process image data.

In general, at least two laser scanner heads are required to obtain relatively accurate three-dimensional image data by scanning a three-dimensional object. In other words, in order to obtain an accurate three-dimensional image data by photographing a single object with a plurality of laser scanners, the laser scanner should be positioned toward the object in the center of the object.

When photographing an object with multiple laser scanners, such as three laser scanners, as described above, the first laser scanner captures unnecessary images due to the interference of the laser beams emitted from the second and third laser scanners. You get it. In addition, the second and third laser scanners also obtain unnecessary images by the interference of laser beams emitted from adjacent laser scanners.

In order to eliminate the laser interference between the laser scanner and the neighboring laser scanners, the horizontal position of all the laser scanners installed near the subject must be exactly aligned, and the timing and the moving speed of the laser scanners must be accurate without errors. It is possible. However, in order to manufacture such a multi-head laser scanning system, many components (drivers and controllers that control the movement of the laser scanner by various sensors and their outputs) need to be added. There was a problem that the configuration of the system is complicated and the price is increased as required.

Another method is to operate the laser scanners installed around the subject separately so that the regions photographed by the respective laser scanners do not overlap each other. However, this method has a problem in that a high-speed scanning operation cannot be performed because the shooting time is long as many laser scanners operate independently at different timings.

Accordingly, an object of the present invention is to provide a multi-head laser scanner system and an image signal processing method that eliminate laser interference between adjacent laser scanners using adjacent laser scanners and lasers having different wavelengths.

It is another object of the present invention to block a laser output from adjacent laser scanners when photographing a subject, thereby obtaining a high quality image data from each of a plurality of laser scanners and a multi-head laser scanner system and an image signal. To provide a treatment method.

Another object of the present invention is to provide a laser from a neighboring laser scanner by laser scanners having a laser generator for generating a laser of a predetermined wavelength band and an optical band pass filter for filtering only the generated laser. The present invention provides a multihead laser scanner system and an image signal processing method which eliminate interference.

The present invention for achieving the above object is a laser generator for outputting a laser of a predetermined wavelength band to the subject having a three-dimensional shape, a bandpass filter for selectively filtering only the laser of the wavelength band output from the laser generator, An imaging module converts a laser through the bandpass filter into an electrical image signal, and includes at least two laser scanner heads positioned around a subject, each of the laser scanning heads having different wavelengths. It consists of a multi-head laser scanning system characterized in that the output of the laser.

Each of the laser generators in the plurality of laser scanner heads generates lasers having different preset wavelengths, and each of the bandpass filters installed corresponding to the laser generators selectively filters only lasers having a predetermined wavelength. do.

Laser generators and imaging modules in the plurality of laser scanner heads may be configured to operate to output a preset laser to the subject in response to an image acquisition command and convert the laser reflected from the laser into an electrical image signal.

In addition, the imaging module in the plurality of laser scanner head converts the received laser into an electrical image signal, and cuts the signal of the incoming level at a brightness below a predetermined level to eliminate the laser interference phenomenon of the adjacent laser scanner head It is done.

In the multi-head type laser scanner system of the present invention configured as described above, laser interference phenomena between adjacent laser scanner heads are generated by using lasers of different wavelengths, each of which is installed around the subject having a three-dimensional shape. Can be removed. In addition, it is possible to more accurately eliminate the laser interference phenomenon of the adjacent laser scanner head by blocking the laser received by the imaging module inside the respective laser scanner head at a level (brightness) below a certain level.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings in which: FIG. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth. It should be noted that the embodiments of the present invention described below are intended to sufficiently convey the spirit of the present invention to those skilled in the art. It should also be noted that detailed descriptions of well-known functions and configurations in the art that may unnecessarily obscure the subject matter of the present invention are omitted.

1 is a block diagram of a multi-head three-dimensional laser scanner system according to a preferred embodiment of the present invention. Referring to FIG. 1, at least two or more laser scanner heads (hereinafter referred to as “scanner heads”) around the subject 10 having a three-dimensional shape, and the first, second, and third orders are classified in parallel. 12, 14, 16 are located. In FIG. 1 showing an embodiment of the present invention, three scanner heads are arranged but may be more than that. The scanner heads 12, 14, and 16 are operated under the control of a personal computer 18 to output lasers having different wavelengths to the subject 10, and among the lasers reflected therefrom. Only a laser of a predetermined wavelength is selectively received to transmit 3D image data to the personal computer 18.

In the embodiment of the present invention, an example of controlling the operation of the first to third scanner heads 12, 14, and 16 as the personal computer 18 is described. However, the first to third scanner heads may also be controlled by an independent processor. The operation of (12, 14, 16) can be controlled.

FIG. 2 is a block diagram of the laser scanner head shown in FIG. 1, wherein each of the first to third scanner heads 12, 14, and 16 according to the present invention generates a laser of a predetermined wavelength to the subject 10. An output laser generator 20 and an optical bandpass filter (hereinafter referred to as a "filter") 22 for receiving a laser beam reflected from the subject 10 and selectively filtering only a laser having a predetermined wavelength band; In response to the image acquisition command, receiving the laser through the filter 22 and converts it into an electrical image signal, and removes the interference image by cutting off the image signal of the luminance level of less than a predetermined level and then extracts the three-dimensional image from it It consists of an imaging module 24 supplied to the personal computer 18.

1 and 2 will be described in detail the specific operation of the multi-head laser scanner system according to an embodiment of the present invention.

Each of the first to third scanner heads 12, 14, and 16 configured as shown in FIG. 2 outputs lasers having different wavelengths in response to an image acquisition command output from the personal computer 18, and lasers having different wavelength bands. By selectively filtering only the received laser beam, the received laser is processed into an electrical image signal. For this operation, the laser wavelength of the laser generator 20 and the filtering band of the filters 22 in the first to third scanner heads 12, 14, and 16 are set as shown in Table 1 below.

division Laser generator output laser wavelength Broadband Filter Filtering Band Remarks First scanner head 12 630 nm 630 nm Second scanner head 14 660 nm 660 nm Third scanner head 16 690 nm 690 nm

As shown in Table 1, each of the laser generators 20 in the first to third scanner heads 12, 14, and 16, in which the laser wavelength and the filtering band are set differently, have different wavelengths in response to the input of the image acquisition command. The laser is output (emitted) to the subject 10. The lasers output from the first to third scanner heads 12, 14, and 16 are reflected by the object 10 and are disposed in the first to third scanner heads 12, 14, and 16 at the reflection positions thereof. And then is received by the imaging module 24.

At this time, the band pass filtering bands of the filters 22 in the first to third scanner heads 12, 14 and 16 are set differently from each other as shown in Table 1 so that only the laser output from the corresponding scanner head passes. The laser output from adjacent scanner heads is cut off. Therefore, each imaging module 24 in the first to third scanner heads 12, 14, and 16 selectively receives only the laser generated by being reflected from the laser generator 20 embedded in the same housing and reflected on the subject 10. To convert it into a digital video signal.

At this time, each of the imaging module 24 is an image sensor for acquiring an analog image signal from a light source like a conventional digital camera, and an ADC for converting an analog image signal output from the image sensor into a digital signal ( and a video signal processing module for processing digital video data. The image signal processing module may be configured with a digital signal processor (DSP). The imaging module 24 configured as described above obtains an analog image signal from a laser selectively filtered by the filter 22 in response to an image acquisition command transmitted from the personal computer 18, and obtains the obtained analog image. Convert the signal into a digital video signal. The acquisition of the analog image signal and the conversion of the digital product signal are performed by the image sensor and the ADC.

The image pickup module 24, which has acquired the digital image data as described above, removes the interference image by the internal image signal processing module, and then extracts the 3D image data and transmits the extracted 3D image data to the personal computer 18. Here, the reason for performing the step of removing the interference image is that even if the fabrication of a band pass filter for filtering only the laser of a certain wavelength band does not completely block the light of different wavelength 100%. Therefore, in the process of extracting the 3D image from the image data captured and digitally converted by the operation of the image sensor and the ADC of the imaging module 24, the received digital image signal is cut off at a certain level or less. The laser interference output from the scanner head can be more accurately eliminated.

The imaging module 24 which removes interference from lasers output from adjacent scanner heads by the above process extracts 3D image data and transmits the 3D image data to the personal computer 18. At this time, the personal computer 18 stores three-dimensional image data transmitted from three scanner heads in an internal memory.

In an embodiment of the present invention, the wavelength and the filtering band of each laser are set to about 30 nm to remove laser interference from adjacent scanner heads, but the present invention is not limited thereto. In addition, in the above-described embodiment, the removal of the interference image from the imaging module 24 in the scanner head has been described as an example. However, a person who understands the technical contents of the present invention receives the digital image data from the imaging module 24. It should be noted that the interference image may be removed from the personal computer 18, and it is very obvious that such contents also fall within the scope of the technical idea of the present invention.

As described above, the present invention eliminates laser interference by using lasers of different wavelengths with adjacent scanner heads, and when the level of image data obtained from the laser is less than a certain level of intensity (brightness). By removing the interference image by blocking it, high quality 3D image data can be obtained from a multi-head laser scanner. In addition, by eliminating the interference of laser output from adjacent scanner heads with a simple structure, the entire scanner head can be operated at the same time to maximize the shooting time as well as the timing and speed of movement of each scanner head. This eliminates the need for accurate synchronization with multiple scanners.

Claims (4)

In the multi-head laser scanner system, A laser generator for outputting a laser beam having a predetermined wavelength band to a three-dimensional object; A band pass filter for selectively filtering only lasers in the wavelength band output from the laser generator; An imaging module configured to convert the laser through the bandpass filter into an electrical image signal, and including at least two laser scanner heads positioned around the subject, each of the laser scanning heads outputting lasers having different wavelengths; Multi-head laser scanning system, characterized in that it only filters lasers of a predetermined wavelength. The laser generating apparatus of claim 1, wherein each of the laser generators in the plurality of laser scanner heads generates a laser having a different wavelength, wherein each of the bandpass filters installed in correspondence to the laser generators selectively selects a laser having a preset wavelength. Multi-head laser scanning system characterized by filtering. delete delete

Images