CN110554403A - Laser scanning imaging device - Google Patents
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- CN110554403A CN110554403A CN201810544810.1A CN201810544810A CN110554403A CN 110554403 A CN110554403 A CN 110554403A CN 201810544810 A CN201810544810 A CN 201810544810A CN 110554403 A CN110554403 A CN 110554403A
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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Abstract
The invention discloses a laser scanning imaging device, which comprises a processor and a laser scanning imaging device, wherein a light source comprises two sets of lasers, each set of laser comprises three lasers emitting three different colors respectively, and two lasers emitting the same color in the two sets of lasers correspond to one color channel of each pixel in an image to be scanned; in the process of scanning a plurality of continuous pixels in an image to be scanned, the gray value range of at least one color channel of the pixels is within a preset range, the processor controls one laser of the two lasers corresponding to the color channel meeting the condition to continuously emit light of a first gray value, and the other laser emits light of the difference between the gray value of the current pixel and the first gray value. According to the invention, the high-frequency modulation of the laser which continuously emits the light with the first gray value is avoided, and the requirement on the response capability of the laser is reduced.
Description
Technical Field
The invention relates to the field of laser scanning projection, in particular to laser scanning imaging equipment.
Background
The laser scanning imaging is to use laser as a light source, scan on an image plane through a laser scanning imaging device according to a preset mode, and correspondingly change the color of the emergent laser, so that the laser scanning imaging can be realized on the image plane.
At present, in the process of implementing laser scanning imaging, please refer to fig. 1, fig. 1 is a schematic diagram of laser scanning imaging in the prior art, as shown in fig. 1, a scanning point corresponding to a laser scanning imaging device starts to control a laser in a light source to start emitting light of a corresponding color when entering a pixel region 101, a light spot 111 formed on an image plane by the light emitted by the light source is formed, the scanning point controls the laser in the light source to stop emitting light when leaving the pixel region 101, wherein the scanning point refers to a position scanned by the laser scanning imaging device at the current moment, the laser in the light source starts to emit light of a corresponding color when entering the pixel region 102, and the laser in the light source stops emitting light when leaving the pixel region 102, that is, each time a pixel is scanned, the output of the laser undergoes a change from 0 to the gray level corresponding to the current pixel and then reaches 0, thus, the requirement for the response capability of the laser is high, for example, the gray scale value of a certain color channel of two consecutive pixels is 139 and 150, respectively, the gray scale value of the light emitted by the laser goes through the process of "0 → 139 → 0 → 150 → 0", and as the resolution of the image to be scanned is higher and higher, the modulation frequency of the laser is higher and higher, the shortest time is in the order of 10 nanoseconds, so that the continuous high-frequency pulse modulation causes the performance of the circuit and the laser to be degraded, thereby reducing the service life of the laser scanning imaging device.
Therefore, the technical problem of high requirement of laser scanning imaging technology on the response capability of the laser and the technical problem of performance reduction of the circuit and the laser caused by continuous high-frequency pulse modulation exist in the prior art.
Disclosure of Invention
The embodiment of the invention provides laser scanning imaging equipment, which is used for solving the technical problems that the requirement on the response capability of a laser is high and the performance of a circuit and the laser is reduced due to continuous high-frequency pulse modulation in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a laser scanning imaging apparatus, including a processor and a laser scanning imaging device, where the laser scanning imaging device includes a light source and a scanner, light emitted by the light source is formed by combining light of three different colors, the light source includes two sets of lasers, each set of laser includes three lasers emitting the three different colors, and two lasers emitting the same color in the two sets of lasers correspond to one color channel of each pixel in an image to be scanned;
In the process of scanning a plurality of continuous pixels in the image to be scanned, when the gray value of at least one color channel of the plurality of pixels has a range within a preset range, the processor controls one of the two lasers corresponding to the color channel meeting the condition to continuously emit light of a first gray value, and the other laser emits light of a difference gray value between the gray value of the current pixel and the first gray value, wherein the first gray value is greater than 0 and less than or equal to the minimum gray value of the plurality of pixels in the corresponding color channel.
optionally, the sum of the maximum gray scale values of the light emitted by the two lasers emitting light with the same color in the light source is greater than the maximum gray scale value of the corresponding color channel in the color mode adopted by the laser scanning imaging device.
Optionally, the maximum gray scale of the light emitted by the laser emitting the light of the first gray scale value is greater than or equal to half of the maximum gray scale value of the corresponding color channel.
Optionally, when the maximum gray-scale value of the laser emitted light emitting the first gray-scale value is greater than or equal to the maximum value of the corresponding color channel, the first gray-scale value and the plurality of pixels have a fixed difference between the minimum gray-scale values of the corresponding color channels.
optionally, when the maximum gray scale value of the laser outgoing light emitting the first gray scale value is smaller than the minimum gray scale value of the plurality of pixels in the corresponding color channel, the first gray scale value is greater than 0 and less than or equal to the maximum gray scale value of the laser outgoing light emitting the first gray scale value.
Optionally, when the range of the gray value of any color channel of the plurality of pixels is outside the preset range, the processor controls the two sets of lasers to emit light corresponding to the color channel corresponding to the current pixel together.
Optionally, the laser scanning imaging device pre-buffers color information of pixels of the image to be scanned, and the processor determines a plurality of continuous pixels with range difference within the preset range according to the buffered color information of the pixels.
Optionally, the three lasers are specifically a red laser, a green laser and a blue laser.
Optionally, the scanner is embodied as a MEMS galvanometer or a scanning fiber.
Optionally, when the scanner is specifically a scanning optical fiber, the laser scanning imaging device further includes an optical coupling unit, and the optical coupling unit is disposed between the exit end of the light source and the entrance end of the scanning optical fiber.
Optionally, the incident end of the scanning optical fiber is provided with a lens structure.
Optionally, the laser scanning imaging apparatus further includes an optical magnifying lens group, where the optical magnifying lens group includes at least one optical lens, and the optical magnifying lens group is disposed at an exit end of the laser scanning imaging device.
one or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
Through the scheme that one of the two lasers continuously emits light with a first gray value and the other laser emits light with the difference between the gray value of the current pixel and the first gray value, the two paths of light are combined into the light with the gray value required by the color channel corresponding to the current pixel, so that the gray value of the light emitted by the laser scanning imaging equipment is ensured to be equal to the gray value of the current pixel, compared with the prior art, the high-frequency modulation of the laser continuously emitting the light with the first gray value is avoided, the technical problem that the performance of a circuit and the laser is reduced due to the continuous high-frequency pulse modulation is solved, the service life of the laser scanning imaging equipment is prolonged, on the other hand, the light emitted by the two lasers is combined into the light emitted by the laser scanning imaging equipment, the highest gray value output by each laser is reduced, and the requirement on the response capability of the lasers is also reduced, therefore, the technical problem that the requirement on the response capability of the laser is high is solved, the stability of the laser scanning imaging device in the using process is improved, and the production cost of the laser scanning imaging device is also reduced.
Drawings
FIG. 1 is a schematic diagram of laser scanning imaging in the prior art;
FIG. 2 is a schematic structural diagram of a laser scanning imaging apparatus according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a light source 2021 according to an embodiment of the present invention;
FIG. 4A is a schematic diagram of laser scanning imaging by a MEMS galvanometer;
FIG. 4B is a schematic illustration of laser scanning imaging through a scanning fiber;
FIG. 5 is a schematic diagram of scanning two consecutive pixels according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a laser scanning imaging apparatus including a light coupling unit;
Fig. 7 is a schematic structural diagram of a lensed fiber.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides laser scanning imaging equipment, which is used for solving the technical problems that the requirement on the response capability of a laser is high and the performance of a circuit and the laser is reduced due to continuous high-frequency pulse modulation in the prior art.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a laser scanning imaging apparatus according to an embodiment of the present invention, as shown in fig. 2, the laser scanning imaging apparatus includes a processor 201 and a laser scanning imaging device 202, the laser scanning imaging device 202 includes a light source 2021 and a scanner 2022, light emitted from the light source 2021 is formed by combining light of three different colors, the light source 2021 includes two sets of lasers, each set of lasers includes three lasers respectively emitting three different colors, two lasers emitting the same color in the two sets of lasers correspond to one color channel of each pixel in an image to be scanned, for example, the image to be scanned adopts an RGB color mode, that is, each pixel in the image to be scanned has a red color channel, a green color channel and a blue color channel, two red lasers in the light source 2021 correspond to the red color channel, two green lasers correspond to the green channel and two blue lasers correspond to the blue channel.
In a specific implementation process, if the laser scanning imaging device adopts an RGB color mode, the light emitted by the light source 2021 is formed by combining a red laser, a green laser, and a blue laser, referring to fig. 3, fig. 3 is a schematic structural diagram of a set of lasers in the light source 2021 according to an embodiment of the present invention, as shown in fig. 3, the set of lasers includes a red laser 20211, a green laser 20212, a blue laser 20213, and a light combining unit 20214, where the red laser 20211 may be specifically a red laser light source, the green laser 20212 may be specifically a green laser light source, and the blue laser 20213 may be specifically a blue laser light source, which is not limited herein; in this embodiment, the light combining unit 20214 includes a red light combining unit 202141 disposed at the emitting end of the red laser 20211, a green light combining unit 202142 disposed at the emitting end of the green laser 20212, and a blue light combining unit 202143 disposed at the emitting end of the blue laser 20213; as shown in fig. 3, in the present embodiment, the red light combining unit 202141 is specifically a red-reflecting color filter disposed at the emitting end of the red laser 20211, the green light combining unit 202142 is specifically a red-transmitting green-reflecting color filter disposed at the emitting end of the green laser 20212, the blue light combining unit 202143 is specifically a red-reflecting green-transmitting blue-reflecting color filter disposed at the emitting end of the blue laser 20213, and thus, through the red light reflecting filter, the red light transmitting green light reflecting filter and the red and green light reflecting blue light transmitting filter, that is, the light beams emitted from the red laser 20211, the green laser 20212, and the blue laser 20213 can be combined together, in other embodiments, the characteristics of the reflected light or the transmitted light of each light combining unit in the light combining unit 20214 are different according to the different optical path designs among the red laser 20211, the green laser 20212, and the blue laser 20213, which is not limited herein. Referring to fig. 5, the light emitted from the two sets of lasers in the light source 2021 is combined by a light combiner, which can be used for scanning by the laser scanning imaging device, and is not described herein again.
In another embodiment, the light emitted from the light source 2021 may also be light emitted from lasers with the same color channel in the two sets of lasers, for example, the light emitted from the two red lasers is combined first, the light emitted from the two green lasers is combined together, the light emitted from the two blue lasers is combined together, and the combined light is combined by the light combining device, so that the obtained light may also be used for scanning by the laser scanning imaging device, which is not described herein again.
in the following sections, three lasers, specifically, a red laser, a green laser, and a blue laser are taken as an example for description, for example, the red laser may emit a red laser with a wavelength of 638nm, the green laser may emit a green laser with a wavelength of 532nm, and the blue laser may emit a blue laser with a wavelength of 450 nm.
In a specific implementation process, the scanner 2022 may be an MEMS galvanometer or a scanning optical fiber, please refer to fig. 4A and 4B, fig. 4A is a schematic diagram of laser scanning imaging performed by the MEMS galvanometer, as shown in fig. 4A, light emitted from the light source 2021 is incident on the MEMS galvanometer 301, scanning can be achieved by vibration of the MEMS galvanometer 301, and simultaneously, color of the light emitted from the light source 2021 is changed, i.e., a purpose of laser scanning imaging can be achieved; referring to fig. 4B, fig. 4B is a schematic diagram of performing laser scanning imaging through a scanning optical fiber, as shown in fig. 4B, after an optical fiber emitted from a light source 2021 is coupled into the scanning optical fiber 302, an emitting end of the scanning optical fiber 302, that is, the optical fiber cantilever 3021, vibrates under the action of a driving device such as a piezoelectric ceramic driver, so that light emitted from the optical fiber cantilever 3021 can be scanned, and simultaneously, the color of the light emitted from the light source 2021 is changed, i.e., the purpose of laser scanning imaging can be achieved. In practical applications, those skilled in the art can select other suitable manners to implement laser scanning imaging according to practical situations, and details are not described herein.
In a specific implementation process, please refer to fig. 5, fig. 5 is a schematic diagram of scanning two consecutive pixels according to an embodiment of the present invention, as shown in fig. 5, an image to be scanned adopts an RGB color mode, where pixels 501 and 502 are two adjacent pixels, a value of the pixel 501 on R, G and three color channels B is (139, 10, 80), a value of the pixel 502 on R, G and three color channels B is (150, 205, 205), a range of the two pixels on a red color channel is 11, if a preset range of a gray-level value x of the color channel is set to be 0 ≦ x ≦ 40, it is determined that the range of the red color channel between the pixels 501 and 502 is within the preset range, and therefore, when the laser scanning imaging device scans the pixels 501 and 502, the processor 201 controls one red laser in the light source 2021 to emit a first gray-level light, and controlling the other red laser to emit light rays with the difference between the gray level of the current pixel and the first gray level value, wherein the light rays emitted by the two red lasers are combined into light rays with the gray levels corresponding to the red channels in the pixels 501 and 502, and the first gray level value is more than 0 and less than or equal to the minimum gray level value of the pixels in the corresponding color channels. In this embodiment, with reference to fig. 5, the minimum value of the pixels 501 and 502 in the red channel is 139, so that the first gray scale value is 139 or less, that is, when the laser scanning imaging device scans the pixels 501 and 502, one red laser may be controlled to continuously emit light with a gray scale value of 139, the other red laser may emit light with a gray scale value of 0 or no light when scanning the pixel 501, and emit light with a gray scale value of 11 when scanning the pixel 502, so that compared with the prior art in which the gray scale value of the light emitted by the laser is "0 → 139 → 0 → 150 → 0", in this embodiment, the light emitted by one laser continuously emits light with a gray scale value of 139, the light emitted by the other laser is subjected to the process of "0 → (0) → 0 → 11 → 0", and for the laser, the gray scale level of the light to be emitted is higher, the demand for the responsiveness of the laser increases exponentially, thereby significantly reducing the demand for the responsiveness of the laser during laser scanning imaging.
Of course, it is also possible to control one red laser to continuously emit light with the gray scale value of 130, another red laser to emit light with the gray scale value of 9 when scanning the pixel 501, and another red laser to emit light with the gray scale value of 20 when scanning the pixel 502, in this embodiment, one laser continuously emits light with the gray scale value of 139, and another laser to emit light with the gray scale value of 0 → 139 → 0 → 11 → 0, in the same way, the response capability of the laser in the laser scanning imaging process is also significantly reduced.
In a specific implementation process, when the maximum gray scale value of the laser outgoing light emitting the first gray scale value is greater than or equal to the maximum value of the corresponding color channel, for example, the maximum gray scale value of the laser outgoing light emitting the first gray scale value is 255, and the maximum value of the corresponding color channel in the image to be scanned is 255, the first gray scale value may be set to have a fixed difference with the minimum gray scale value of the corresponding color channel of the plurality of pixels, where the fixed difference may be 0, 1, or 2, and the like, which is not limited herein.
When the maximum gray value of the light emitted by the laser emitting the first gray value is less than the minimum gray value of the plurality of pixels in the corresponding color channel, 0 < the first gray value is less than or equal to the maximum gray value of the light emitted by the laser emitting the first gray value, of course, it is required to ensure that the gray value of the combined light emitted by the two lasers in the same color channel can be equal to the gray value of the current pixel, which is not repeated herein, for example, the maximum gray value of the light emitted by the laser emitting the first gray value is 200, the minimum gray value of the light emitted by the plurality of pixels in the corresponding color channel is 220, the maximum gray value of the light emitted by the laser emitting the first gray value is 240, the first gray value can be any value between 1 and 200, such as 180, of course, the sum of the gray value of the light emitted by the other laser in the corresponding color channel and the first gray value can be equal to the gray, for example, the maximum gray value of the light emitted by another laser needs to be greater than or equal to 60.
After describing the specific process of controlling the two lasers to emit light rays with corresponding gray scale values in the scanning process of the pixels 501 and 502, a person skilled in the art can deduce that the specific process of controlling each laser in the light source to emit light rays with corresponding gray scale values when the gray scale values of three or more pixels and two color channels or three color channels are within the preset range is not described herein again.
Of course, in practical applications, a person skilled in the art can adjust the gray values of the respective emergent light rays of the two lasers corresponding to the color channels with the range difference within the preset range according to practical situations to meet the needs of the practical situations, and details are not described herein.
In the image to be scanned, when the plurality of pixels do not meet the condition, that is, the range of the gray value of any color channel of the plurality of pixels is out of the preset range, the processor controls the two sets of lasers to emit the light corresponding to the color channel corresponding to the current pixel together. The gray value of the light emitted by each of the two sets of lasers can be set according to the actual situation, and preferably, the gray value of the light emitted by each of the two sets of lasers is half of the gray value of the color channel corresponding to the current pixel.
Scanning may be performed in a normal manner or in a manner known in the art, and will not be described herein.
Through the above-mentioned part, it can be seen that, by the scheme that one of the two lasers continuously emits light with the first gray scale value and the other laser emits light with the difference between the gray scale value of the current pixel and the first gray scale value, the two paths of light are combined into the light with the gray scale value required by the color channel corresponding to the current pixel, so as to ensure that the gray scale value of the light emitted by the laser scanning imaging device is equal to the gray scale value of the current pixel, compared with the prior art, the high frequency modulation of the laser continuously emitting the light with the first gray scale value is avoided, so that the technical problem that the performance of the circuit and the laser is reduced due to the continuous high frequency pulse modulation is solved, the service life of the laser scanning imaging device is prolonged, on the other hand, the light emitted by the two lasers is combined into the light emitted by the laser scanning imaging device, so as to reduce the highest gray, the requirement on the response capability of the laser is also reduced, so that the technical problem of high requirement on the response capability of the laser is solved, the stability of the laser scanning imaging device in the using process is improved, and the production cost of the laser scanning imaging device is also reduced.
in a specific implementation process, the sum of the maximum gray values of the two lasers emitting light rays with the same color in the light source 2021 when emitting light rays is greater than the maximum gray value of the corresponding color channel in the color mode adopted by the laser scanning imaging device, so that on one hand, the light rays output by the light source 2021 meet the requirement of the laser scanning imaging device when scanning an image to be scanned, on the other hand, the lasers can be more flexibly modulated, and the limitation caused by too low gray value of the light rays emitted by the lasers is reduced.
In the implementation, it can be understood that if the maximum value of the first gray scale value is smaller, for example, a single bit or two bits, then it still needs another laser with higher response capability and the laser is still modulated at high frequency, which is a small improvement compared with the prior art, therefore, it is preferable that the laser emitting the light of the first gray scale value is capable of emitting the maximum gray scale of the light greater than or equal to half of the maximum value of the corresponding color channel, so that the requirement for the response capability of the laser can be reduced by at least half.
In a specific implementation process, in order to ensure that, when a plurality of consecutive pixels have a range of gray scale value of at least one color channel within a preset range, one of two lasers corresponding to the color channel meeting the condition is accurately controlled to continuously emit light of a first gray scale value, and the other laser emits light of a difference between the gray scale value of a current pixel and the first gray scale value, the laser scanning imaging device may further pre-buffer color information of the pixels of an image to be scanned, and specifically may buffer a next line or a plurality of lines of pixels to be scanned, so that the processor 201 may analyze the buffered pixels and extract color information of all the pixels, and thus may determine a plurality of consecutive pixels having the range of gray scale value within the preset range according to the buffered color information of the pixels, and then may determine, according to the determination result, and generating corresponding control parameters in advance, so that when the laser scanning imaging device scans a plurality of continuous pixels with the gray value difference of at least one color channel in the preset range, one laser of the two lasers corresponding to the color channel meeting the condition is controlled to continuously emit light of the first gray value, and the other laser emits light of the difference between the gray value of the current pixel and the first gray value.
Of course, it should be noted that, in the case that the processing speed of the laser scanning imaging device is fast enough, for example, the reading speed of the image to be scanned, the resolution speed of the color information of the image to be scanned, the speed of outputting the control parameter, and the like, the laser scanning imaging device is not required to buffer the color information of the pixels of the image to be scanned in advance.
in a specific implementation process, when the scanner is specifically a scanning optical fiber, the incident end of the scanning optical fiber is provided with a lens structure, that is, the scanning optical fiber is specifically a lens optical fiber (lensfiber) whose lens structure is arranged at the incident end, the scanning optical fiber can form a spherical, wedge-shaped or conical lens at one end of the optical fiber through sintering or grinding, and the like, so as to increase the numerical aperture of the scanning optical fiber, and thereby increase the light-receiving rate of the scanning optical fiber, so that it is not necessary to further provide the optical coupling unit in fig. 6, please refer to fig. 7, where fig. 7 is a schematic structural diagram of the lens optical fiber, as shown in fig. 7, the lens optical fiber is 71, and the incident end of the lens optical fiber is provided with a spherical.
In a specific implementation process, please refer to fig. 2, as shown in fig. 2, the laser scanning imaging apparatus further includes an optical magnifying lens set 203, the optical magnifying lens set 203 includes at least one optical lens, and the specific number of the lenses and the parameter setting of the lenses are based on meeting the requirements of the actual situation, which is not limited herein.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "comprises" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words are to be construed as names.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
Through the scheme that one of the two lasers continuously emits light with a first gray value and the other laser emits light with the difference between the gray value of the current pixel and the first gray value, the two paths of light are combined into the light with the gray value required by the color channel corresponding to the current pixel, so that the gray value of the light emitted by the laser scanning imaging equipment is ensured to be equal to the gray value of the current pixel, compared with the prior art, the high-frequency modulation of the laser continuously emitting the light with the first gray value is avoided, the technical problem that the performance of a circuit and the laser is reduced due to the continuous high-frequency pulse modulation is solved, the service life of the laser scanning imaging equipment is prolonged, on the other hand, the light emitted by the two lasers is combined into the light emitted by the laser scanning imaging equipment, the highest gray value output by each laser is reduced, and the requirement on the response capability of the lasers is also reduced, therefore, the technical problem that the requirement on the response capability of the laser is high is solved, the stability of the laser scanning imaging device in the using process is improved, and the production cost of the laser scanning imaging device is also reduced.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. A laser scanning imaging device is characterized by comprising a processor and a laser scanning imaging device, wherein the laser scanning imaging device comprises a light source and a scanner, light emitted by the light source is formed by combining light of three different colors, the light source comprises two sets of lasers, each set of laser comprises three lasers emitting the three different colors respectively, and two lasers emitting the same color in the two sets of lasers correspond to one color channel of each pixel in an image to be scanned;
in the process of scanning a plurality of continuous pixels in the image to be scanned, when the gray value of at least one color channel of the plurality of pixels has a range within a preset range, the processor controls one of the two lasers corresponding to the color channel meeting the condition to continuously emit light of a first gray value, and the other laser emits light of a difference gray value between the gray value of the current pixel and the first gray value, wherein the first gray value is greater than 0 and less than or equal to the minimum gray value of the plurality of pixels in the corresponding color channel.
2. The laser scanning imaging device as claimed in claim 1, wherein the sum of the maximum gray scale values of the light emitted from the two lasers emitting the same color light in the light source is greater than the maximum gray scale value of the corresponding color channel in the color mode adopted by the laser scanning imaging device.
3. The laser scanning imaging device of claim 1, wherein the laser emitting light of said first gray scale value emits light having a maximum gray scale value greater than or equal to half of the maximum gray scale value of the corresponding color channel.
4. The laser scanning imaging device of claim 1, wherein the first gray value and the plurality of pixels have a fixed difference between the minimum gray values of the corresponding color channels when the maximum gray value of the laser emitted light emitting the first gray value is greater than or equal to the maximum value of the corresponding color channel.
5. The laser scanning imaging device of claim 1, wherein 0 < said first gray scale value ≦ maximum gray scale value of laser outgoing light emitting said first gray scale value when maximum gray scale value of laser outgoing light emitting said first gray scale value is less than minimum gray scale value of said plurality of pixels at corresponding color channels.
6. The laser scanning imaging apparatus of claim 1, wherein when a range of gray values of any one color channel of the plurality of pixels is outside the preset range, the processor controls the two sets of lasers to emit light corresponding to the color channel corresponding to the current pixel together.
7. The laser scanning imaging device according to any one of claims 1 to 6, wherein the laser scanning imaging device pre-buffers color information of pixels of the image to be scanned, and the processor determines a plurality of continuous pixels with a range within the preset range according to the buffered color information of the pixels.
8. Laser scanning imaging device according to claim 7, characterized in that said three lasers are in particular a red laser, a green laser and a blue laser.
9. laser scanning imaging device according to claim 1, characterized in that the scanner is embodied as a MEMS galvanometer or a scanning fiber.
10. The laser scanning imaging apparatus of claim 1, further comprising an optical magnifier group, wherein the optical magnifier group comprises at least one optical lens, and the optical magnifier group is disposed at the exit end of the laser scanning imaging device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810544810.1A CN110554403A (en) | 2018-05-31 | 2018-05-31 | Laser scanning imaging device |
| PCT/CN2019/087950 WO2019228238A1 (en) | 2018-05-31 | 2019-05-22 | Laser scanning imaging device |
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| CN201810544810.1A CN110554403A (en) | 2018-05-31 | 2018-05-31 | Laser scanning imaging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109960097A (en) * | 2017-12-22 | 2019-07-02 | 成都理想境界科技有限公司 | A kind of monochromatic laser light source, color laser light source and laser projection device |
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| WO2019228238A1 (en) | 2019-12-05 |
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