CN113271447A - Laser projection apparatus and image correction system - Google Patents
Laser projection apparatus and image correction system Download PDFInfo
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- CN113271447A CN113271447A CN202110573759.9A CN202110573759A CN113271447A CN 113271447 A CN113271447 A CN 113271447A CN 202110573759 A CN202110573759 A CN 202110573759A CN 113271447 A CN113271447 A CN 113271447A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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Abstract
The application discloses laser projection equipment and image correction system belongs to the projection display field. Since the image processing circuit can perform correction processing on the second projection image based on the correction parameter determined by the parameter determination circuit, the display control circuit is caused to project the second projection image after the correction processing onto the projection screen. The position of the second projection image on the projection screen is thereby corrected, and the display effect of the projection image is ensured. In addition, the parameter determination circuit is integrated on the control chip of the mainboard, so that the internal structure of the laser projection equipment is effectively simplified, and the integration level of the laser projection equipment is improved.
Description
Technical Field
The present disclosure relates to the field of projection display, and in particular, to a laser projection apparatus and an image correction system.
Background
The ultra-short-focus laser projection device can project and display the projection image on the projection screen. For the ultra-short-focus laser projection device, because the light is emitted obliquely upwards due to the principle of projection imaging, the position between the laser beam emitted by the optical engine in the ultra-short-focus laser projection device and the projection screen must be aligned strictly, and the slight displacement of the ultra-short-focus laser projection device can also cause the deformation or distortion of the picture. If the user moves the ultra-short-focus laser projection device carelessly, the projection image projected and displayed by the ultra-short-focus laser projection device may exceed the projection screen, resulting in poor display effect of the displayed projection image.
Disclosure of Invention
The embodiment of the disclosure provides a laser projection device and an image correction system, which can solve the problem that the projection image projected and displayed by an ultra-short-focus laser projection device in the related art may exceed a projection screen, resulting in poor display effect of the displayed projection image. The technical scheme is as follows:
in one aspect, a laser projection apparatus is provided, the laser projection apparatus comprising: the device comprises a parameter determining circuit, an image processing circuit, a display control circuit, a light valve and a projection lens; the parameter determination circuit is integrated in a control chip of a mainboard of the laser projection equipment;
the parameter determining circuit is connected with the image processing circuit and is used for determining a correction parameter based on a shot image and transmitting the correction parameter to the image processing circuit, wherein the shot image is obtained by shooting a projection screen on which a first projection image is displayed;
the image processing circuit is connected with the display control circuit and is used for correcting the second projection image to be displayed based on the correction parameter and transmitting the corrected second projection image to the display control circuit;
the display control circuit is used for generating a light valve control signal based on the corrected second projection image, controlling the light valve to modulate a light beam irradiated to the surface of the light valve into an image light beam based on the light valve control signal, and controlling the light valve to project the image light beam to the projection lens based on the light valve control signal;
the projection lens is used for projecting the image light beam to the projection screen so as to correct the projection position of the second projection image on the projection screen.
Optionally, the display panel in the laser projection device includes a Digital Light Processing (DLP) chip, and the image processing circuit is integrated in the DLP chip.
Optionally, the parameter determining circuit and the image processing circuit are connected based on a Universal Serial Bus (USB) protocol.
Optionally, the laser projection apparatus further includes: the USB interface circuit, the switch circuit and the switch control circuit are positioned on the mainboard;
the USB interface circuit is respectively connected with the parameter determining circuit and the first end of the switch circuit, the second end of the switch circuit is connected with the image processing circuit, and the control end of the switch circuit is connected with the switch control circuit;
the parameter determining circuit is configured to transmit the correction parameter to the USB interface circuit, the USB interface circuit is configured to transmit the correction parameter to the switch circuit, and the switch circuit is configured to control the first terminal and the second terminal to be turned on in response to a switch signal sent by the switch control circuit, and transmit the correction parameter to the image processing circuit.
Optionally, the laser projection apparatus further includes: a connector on the motherboard;
the connector is connected with the second end of the switch circuit and the image processing circuit based on the USB protocol, and the switch circuit is used for transmitting the correction parameters to the image processing circuit through the connector.
Optionally, the parameter determination circuit and the image processing circuit are connected based on an I2C protocol.
Optionally, the laser projection apparatus further includes: a main control circuit on the display panel, the main control circuit being connected to the parameter determination circuit and the image processing circuit, respectively, based on the I2C protocol;
the parameter determining circuit is used for transmitting the correction parameters to the image processing circuit through the main control circuit.
Optionally, the main control circuit is a micro control unit MCU.
Optionally, the control chip is a system on chip SoC.
In another aspect, there is provided an image correction system, the system comprising: a mobile terminal, and a laser projection device as described in the above aspect; the mobile terminal is used for shooting a projection screen to obtain a shot image, and sending the shot image to the parameter determining circuit of the laser projection equipment.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the embodiment of the present disclosure provides a laser projection device and an image correction system, since an image processing circuit may perform correction processing on a second projection image based on a correction parameter determined by a parameter determination circuit, so that a display control circuit projects the second projection image after the correction processing onto a projection screen. Therefore, the position of the second projection image on the projection screen is corrected, the projection image is prevented from exceeding the projection screen, or the projection image displayed on the projection screen is prevented from deforming, and the display effect of the projection image is ensured. In addition, the parameter determination circuit is integrated on the control chip of the mainboard, so that the internal structure of the laser projection equipment is effectively simplified, and the integration level of the laser projection equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a feature pattern provided by an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another feature pattern provided by embodiments of the present disclosure;
fig. 4 is a schematic structural diagram of an image correction system provided in an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of another image correction system provided in the embodiments of the present disclosure;
fig. 8 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure. As shown in fig. 1, the laser projection apparatus 00 may include a parameter determination circuit 101, an image processing circuit 201, a display control circuit 202, a light valve 300, and a projection lens 400. The parameter determination circuit 101 is integrated in the control chip 102 of the main board 10. Alternatively, the control chip 102 may be a system on chip (SoC).
The parameter determination circuit 101 is connected to the image processing circuit 201, and the parameter determination circuit 101 is configured to determine a correction parameter based on a captured image and transmit the correction parameter to the image processing circuit 201.
The captured image is obtained by capturing a projection screen on which the first projection image is displayed, and the captured image may include a frame of the projection screen and the first projection image. It will be appreciated that this first projection image is an image used for determining the correction parameters and may therefore also be referred to as a correction image. The first projection image may include a plurality of feature patterns arranged in an array, each of the feature patterns may be a quadrangle, a cross, or the like, and a color of each of the feature patterns is different from a background color of the first projection image. Referring to fig. 2, the first projected image 000 may include 16 feature patterns 0001 of 4 × 4, each feature pattern 0001 may be a cross, the color of each feature pattern 0001 may be black, and the background color of the first projected image 000 may be white.
Alternatively, the first projection image may be a checkerboard image, and the first projection image may include black feature patterns and white feature patterns arranged in an array. Referring to fig. 3, the first projection image 000 may include 576 feature patterns 0001 of 18 × 32.
The image processing circuit 201 is connected to the display control circuit 202, and the image processing circuit 201 is configured to perform correction processing on the second projection image based on the correction parameter and to transmit the second projection image after the correction processing to the display control circuit 202. The second projection image is an image for displaying video content.
The display control circuit 202 is configured to generate a light valve control signal based on the corrected second projection image, control the light valve 300 to modulate the light beam irradiated to the surface thereof into an image light beam based on the light valve control signal, and control the light valve 300 to project the image light beam to the projection lens 400 based on the light valve control signal.
The projection lens 400 is configured to transmit the image beam to the projection screen to correct the projection position of the corrected second projection image on the projection screen.
The display control circuit 202, after receiving the correction-processed second projection image transmitted from the image processing circuit 201, may generate a light valve control signal based on the pixel value of the correction-processed second projection image, and may control the light valve 300 based on the light valve control signal. The light valve 300 modulates the light beam irradiated to the surface thereof into an image light beam under the control of the light valve control signal, and transmits the image light beam to the projection lens 400. The projection lens 400 can project the image beam transmitted by the light valve 300 to a projection screen. By performing correction processing on the second projection image and projecting the second projection image after the correction processing to the projection screen, the projection position of the second projection image on the projection screen is corrected.
In summary, the embodiment of the present disclosure provides a laser projection apparatus, since the image processing circuit may perform correction processing on the second projection image based on the correction parameter determined by the parameter determination circuit, so that the display control circuit projects the second projection image after the correction processing onto the projection screen. Therefore, the position of the second projection image on the projection screen is corrected, the projection image is prevented from exceeding the projection screen, or the projection image displayed on the projection screen is prevented from deforming, and the display effect of the projection image is ensured.
In addition, the parameter determination circuit is integrated on the control chip of the mainboard, so that the internal structure of the laser projection equipment is effectively simplified, and the integration level of the laser projection equipment is improved.
Fig. 4 is a schematic structural diagram of an image correction system according to an embodiment of the present disclosure. As shown in fig. 4, the system may further include a mobile terminal 01. In the embodiment of the present disclosure, after the laser projection apparatus 00 displays the first projection image on the projection screen, the mobile terminal 01 may capture the projection screen and the first projection image to obtain a captured image, and may send the captured image to the parameter determination circuit 101 in the laser projection apparatus 00. The parameter determination circuit 101 may determine a correction parameter based on the captured image.
In an optional implementation manner of the embodiment of the present disclosure, if the flatness of the projection screen is good, the colors of the plurality of feature patterns included in the first projection image (i.e., the correction image) stored in advance in the laser projection apparatus are all the same, and the color of each feature pattern is different from the background color of the projection image. If the image projected to the projection screen by the laser projection equipment exceeds the projection screen, the laser projection equipment projects the first projection image to the projection screen in the image correction process.
For example, the first projection image may be as shown in fig. 2. Accordingly, the correction parameters may include corrected positions of the plurality of vertices in the second projection image in the first image coordinate system. If the second projection image is a quadrilateral, the vertices of the second projection image may include an upper left vertex, a lower left vertex, an upper right vertex, and a lower right vertex.
The following describes the process of the parameter determination circuit 101 determining the corrected position of the target vertex in the second projection image in the first image coordinate system, where the target vertex can be any vertex of the second projection image:
first, the parameter determination circuit 101 may determine a target projection position of the target feature pattern in the projection screen according to the perspective transformation coefficient of the camera in the mobile terminal and the position of the target feature pattern in the captured image after receiving the captured image transmitted by the mobile terminal. The target feature pattern may be a feature pattern closest to a projection position of the target vertex among the plurality of feature patterns. For example, assuming that the target vertex of the second projection image is the top right vertex, the target feature may be a feature located at the top right corner among the plurality of features. For example, referring to fig. 2, the target feature pattern may be the feature pattern 0001 in the upper right corner of the first projection image 000.
The perspective transformation coefficient can transform the position of any point in the projection screen into the position in the shot image, namely the perspective transformation coefficient is a variation coefficient between the screen coordinate system of the projection screen and the second image coordinate system of the shot image. The perspective transformation coefficient is related to the shooting position of the camera, the distance between the camera and the projection screen and the resolution of the camera.
Thereafter, the parameter determination circuit 101 may determine an actual relative position between the position of the target vertex of the bounding box of the projection screen and the target projection position, and may determine an initial relative position between the position of the target vertex of the bounding box and the initial projection position of the target feature pattern. Further, the parameter determination circuit 101 may determine the target offset amount from the actual relative position and the initial relative position. The target offset is the offset of the target vertex of the first projection image in the target projection position of the projection screen relative to the initial projection position. It will be appreciated that the target offset may be a vector comprising the direction of the offset and the magnitude of the offset value.
And when the first projection image does not exceed the projection screen, the initial projection position of the target feature pattern is the projection position of the target feature pattern in the projection screen. The target vertex of the frame may be a vertex of the plurality of vertices of the frame that is at the same orientation as the target vertex in the second projection image. The target vertex of the first projection image is a vertex of the plurality of vertices of the first projection image that is at the same orientation as the target vertex of the second projection image. For example, if the target vertex in the second projection image is the top right vertex of the second target image, the target vertex of the frame is the top right vertex of the frame, and the target vertex of the first projection image is the top right vertex of the first projection image.
Further, the parameter determination circuit 101 may determine a pixel shift amount of the target vertex of the second projection image in the first image coordinate system from the correspondence relationship stored in advance based on the target shift amount, and thereby may determine a correction position of the target vertex of the second projection image in the first image coordinate system based on the pixel shift amount and the initial position of the target vertex of the second projection image in the first image coordinate system.
The pixel shift amount may be a vector including a shift direction and a shift value. The correspondence is a correspondence of an offset amount in the screen coordinate system and an offset amount in the first image coordinate system.
Based on the above method, the parameter determination circuit 101 may determine the corrected position of each vertex in the second projection image in the first image coordinate system, and may transmit the corrected positions of the plurality of vertices of the second projection image to the image processing circuit 201. The image processing circuit 201 may perform correction processing on the second projection image based on the corrected position of each vertex in the first image coordinate system in the second projection image, thereby obtaining the second projection image after the correction processing.
Alternatively, for each vertex in the second projection image, the image processing circuit 201 may move the vertex and a pixel point located between the initial position and the correction position of the vertex to the correction position of the vertex, thereby implementing the correction processing of the second projection image.
It is understood that, in the embodiments of the present disclosure, the target projection position, the initial projection position, and the positions of the plurality of vertices of the projection screen of the target feature pattern may all refer to positions in the screen coordinate system of the projection screen. The corrected position and the initial position of the vertex in the second projection image refer to positions in the first image coordinate system of the second projection image. The position of each feature pattern in the captured image refers to a position in the second image coordinate system of the captured image.
The origin of the screen coordinate system is the central point of the projection screen, the horizontal axis of the screen coordinate system is parallel to the pixel row direction of the projection screen, and the vertical axis of the screen coordinate system is parallel to the pixel row direction of the projection screen. The origin of the first image coordinate system is the central point of the second projection image, the horizontal axis of the first image coordinate system is parallel to the pixel row direction of the second projection image, and the vertical axis of the first image coordinate system is parallel to the pixel row direction of the second projection image. The origin of the second image coordinate system is the center point of the photographed image, the horizontal axis of the second image coordinate system is parallel to the pixel row direction of the photographed image, and the vertical axis of the second image coordinate system is parallel to the pixel row direction of the photographed image.
Alternatively, the target projection position of the target feature may include an abscissa and an ordinate, and the initial projection position of the target feature may include an abscissa and an ordinate. The location of the target vertex of the border of the projection screen may include an abscissa and an ordinate. The actual relative positions may include: a first absolute value and a second absolute value. The first absolute value is an absolute value of a first difference value, the first difference value is a difference value between a numerical value of an abscissa of a position of a target vertex of the frame and a numerical value of an abscissa of the target projection position, the second absolute value is an absolute value of a second difference value, and the second difference value is a difference value between a numerical value of an ordinate of a position of the target vertex of the frame and a numerical value of an ordinate of the target projection position.
The initial relative positions may include: a third absolute value and a fourth absolute value, the third absolute value being an absolute value of a third difference value, the third difference value being a difference value between a value of an abscissa of a position of the target vertex of the frame and a value of an abscissa of the initial projection position. The fourth absolute value is an absolute value of a fourth numerical value, and the fourth numerical value is a numerical difference value between a numerical value of a vertical coordinate of the position of the target vertex of the frame and a numerical value of a vertical coordinate of the initial projection position.
The offset value of the target offset may include a first target offset value and a second target offset value, where the first target offset value is an absolute value of a difference between the third absolute value and the first absolute value, and the second target offset value is an absolute value of a difference between the fourth absolute value and the second absolute value. The offset direction of the target offset amount may include a first direction and a second direction, the first direction being a direction parallel to the pixel row direction and away from a center point of the screen coordinate system. The second direction is a direction parallel to the pixel row direction and away from the center point of the screen coordinate system. The offset value of the pixel offset amount may include a first pixel offset value and a second pixel offset value.
In the following description, taking the target vertex of the frame of the projection screen as the upper right vertex as an example, if the third absolute value is smaller than the first absolute value, the parameter determination circuit 101 may determine that the target projection position of the upper right vertex of the first projection image is shifted by the first target shift value in the first direction from the initial projection position thereof. If the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system is greater than 0, the parameter determination circuit 101 may determine the abscissa of the corrected position of the upper right vertex in the second projection image as the difference between the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system and the first pixel offset value. If the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system is less than 0, the parameter determination circuit 101 may determine that the abscissa of the corrected position of the upper right vertex in the second projection image is the sum of the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system and the first pixel offset value.
If the third absolute value is greater than the first absolute value, the parameter determination circuit 101 may determine that the target projection position of the upper right vertex of the first projection image is offset by a first target offset value in a direction opposite to the first direction with respect to its initial projection position. If the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system is greater than 0, the parameter determination circuit 101 may determine that the abscissa of the corrected position of the upper right vertex in the second projection image is the sum of the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system and the first pixel offset value. If the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system is less than 0, the parameter determination circuit 101 may determine the abscissa of the corrected position of the upper right vertex in the second projection image as the difference between the abscissa of the upper right vertex in the second projection image at the initial position in the first image coordinate system and the first pixel offset value.
If the fourth absolute value is smaller than the second absolute value, the parameter determination circuit 101 may determine that the target projection position of the upper right vertex of the first projection image is shifted by a second target shift value in the second direction with respect to the initial projection position thereof. The parameter determination circuit 101 may determine the corrected position of the top right vertex using the above-described method.
If the fourth absolute value is greater than the second absolute value, the parameter determination circuit 101 may determine that the target projection position of the upper right vertex of the first projection image is shifted in a direction opposite to the second direction by a second target shift value with respect to its initial projection position. The parameter determination circuit 101 may determine the corrected position of the top right vertex using the above-described method.
Based on the above method, the parameter determination circuit 101 may determine the corrected positions of the upper left vertex, the lower left vertex, the upper right vertex, and the lower right vertex of the second projection image in the first image coordinate system.
For example, assuming that the initial position of the top right vertex of the second projection image is greater than the correction position, the image processing circuit 201 may adjust both the top right vertex of the second projection image and a pixel point located between the initial position and the correction position of the top right vertex to the correction position. The second projection image is corrected by reducing the second projection image, and the second projection image is displayed in the frame of the projection screen.
In another optional implementation manner of the embodiment of the present disclosure, if the flatness of the projection screen is poor, the first projection image (i.e., the correction image) stored in advance in the laser projection apparatus is a checkerboard image. If the image projected to the projection screen by the laser projection device is deformed and/or the image exceeds the projection screen, the laser projection device may project the first projection image to the projection screen during the image correction process.
For example, the first projection image may be the first projection image 000 shown in fig. 3. Each feature pattern in the first projection image corresponds to a pixel region of the second projection image, and the pixel region may include a plurality of pixels arranged in an array. Accordingly, the correction parameters may include corrected positions of the plurality of pixel regions in the second projection image in the first image coordinate system.
Wherein, the characteristic pattern located at the ith row and the jth column in the first projection image corresponds to the pixel area at the ith row and the jth column in the second projection image, and each characteristic pattern is used for determining the correction position of the corresponding pixel area. i is a positive integer smaller than or equal to the number of rows of the feature patterns included in the projection image, and j is a positive integer smaller than or equal to the number of columns of the feature patterns included in the projection image.
The parameter determination circuit 101 may determine, for each feature pattern, a target projection position of the feature pattern on the projection screen after receiving the captured image transmitted by the mobile terminal 01, and may determine an actual offset amount of the feature pattern from the target projection position and the initial projection position. Further, the parameter determination circuit 101 may determine the pixel shift amount of the pixel region corresponding to the feature pattern in the second projection image in the first image coordinate system based on the actual shift amount of the feature pattern. And the correction position of the pixel region can be determined based on the pixel shift amount of the pixel region. It will be appreciated that the pixel offset may be a vector including the direction of the offset and the magnitude of the offset value. The initial projection position of the characteristic graph is the projection position of the characteristic graph on the projection screen when the first projection image projected to the projection screen is not deformed.
Based on the above method, the parameter determination circuit 101 can obtain the corrected position of each pixel region in the second projection image. Furthermore, the image processing circuit 201 may correct the pixel in each pixel region of the second projection image to the corrected position of the pixel region in the first image coordinate system, so as to obtain the corrected second projection image, thereby implementing the correction processing on the second projection image, ensuring that the projection image displayed on the deformed projection screen is not deformed, and ensuring that the display effect of the projection image is better.
Referring to fig. 4, the laser projection apparatus may include a display panel 20, the display panel 20 may include a Digital Light Processing (DLP) chip 203, and the image processing circuit 201 may be integrated in the DLP chip 203.
In an alternative implementation manner of the embodiment of the present disclosure, the parameter determining circuit 101 and the image processing circuit 201 may be connected based on a Universal Serial Bus (USB) protocol. Optionally, the USB protocol may be a USB2.0 protocol, and a transmission rate of the USB2.0 protocol may reach 60 megabits per second (MB/s). That is, the parameter determination circuit 101 can transmit the correction parameters of 60MB per second to the image transfer circuit.
Since the parameter determination circuit 101 and the image processing circuit 201 can be connected by the USB protocol, the parameter determination circuit 101 can transmit more data to the image processing circuit 201 at a time (for example, can transmit correction positions of a plurality of pixel regions in the second projection image), so that the efficiency of transmitting the correction parameters is improved, and the efficiency of correcting the projection image is improved.
Referring to fig. 5, the laser projection apparatus may further include a USB interface circuit 103, a switch circuit 104, and a switch control circuit 105 on the main board 10. Alternatively, the USB interface circuit 103 may be a USB hub (hub), and the switch circuit may be a USB switch (switch) circuit.
The USB interface circuit 103 is connected to first terminals of the parameter determination circuit 101 and the switch circuit 104, respectively, a second terminal of the switch circuit 104 is connected to the image processing circuit 201, and a control terminal of the switch circuit 104 is connected to the switch control circuit 105.
Optionally, the USB interface circuit 103 is connected to the parameter determination circuit 101 and a first end of the switch circuit 104 based on the USB protocol, respectively, and a second end of the switch circuit 104 is connected to the image processing circuit 201 based on the USB protocol.
The parameter determining circuit 101 is configured to transmit the correction parameter to the USB interface circuit 103, and the USB interface circuit 103 is configured to transmit the correction parameter to the switching circuit 104. The switch circuit 104 is configured to control the first terminal and the second terminal to be turned on in response to a switch signal sent by the switch control circuit 105, and to transmit the correction parameter to the image processing circuit 201.
Referring to fig. 6, the laser projection apparatus may further include a control circuit 106 on the main board 10, the control circuit 106 being connected to the parameter determination circuit 101, the switch control circuit 105, and the USB interface circuit 103, respectively. The parameter determination circuit 101 may transmit the correction parameter to the control circuit 106 after determining the correction parameter. The control circuit 106, upon receiving the correction parameter, may send a switching signal to the switch control circuit 105. The switch circuit 104 is configured to control the first terminal and the second terminal to be turned on in response to a switch signal sent from the switch control circuit 105, so that the switch circuit 104 can send the correction parameter to the image processing circuit 201 after the USB interface circuit 103 sends the correction parameter to the switch circuit 104.
Referring to fig. 6, the laser projection apparatus may further include a connector 107 on the main board 10, the connector 107 being connected to the second terminal of the switching circuit 104 and the image processing circuit 201 based on the USB protocol. The switching circuit 104 is used to transmit the correction parameters to the image processing circuit 201 through the connector 107.
Referring to fig. 6, the laser projection apparatus may further include a first interface 108 located on the main board, one end of the first interface 108 is connected to the third end of the switch circuit 104, and the other end of the first interface 108 is used for connecting an external device. The first interface is connected to the switching circuit 104 based on the USB protocol.
The control circuit 106 is further configured to transmit a control signal to the switch control circuit 105 after detecting a connection command of an external device to the first interface 108. The first interface 108 is used for transmitting data transmitted by an external device to the switch circuit 104. The switch circuit 104 is configured to control the third terminal and the second terminal to be turned on in response to a control signal sent by the switch control circuit 105, so as to transmit data transmitted by the external device to the image processing device 201.
In the embodiment of the present disclosure, by adding the switching circuit 104, the parameter determination circuit 101 can transmit the correction parameter having a large data amount to the image processing circuit 201 through the switching circuit 104, thereby improving the efficiency of correction parameter transmission.
In another alternative implementation manner of the embodiment of the present disclosure, the parameter determination circuit 101 and the image processing circuit 201 are connected based on an I2C protocol. With the I2C protocol, the parameter determination circuit 101 may transmit a smaller amount of data to the image processing circuit 201 (e.g., may transmit corrected positions of a plurality of vertices in the second projection image).
Referring to fig. 7 and 8, the laser projection device may further include a main control circuit 204 on the display panel 20, the main control circuit 204 being connected to the parameter determination circuit 101 and the image processing circuit 201, respectively, based on the I2C protocol. The parameter determination circuit 101 is configured to transmit the correction parameter to the image processing circuit 201 through the main control circuit 204. Optionally, the main control circuit 204 may be a Micro Controller Unit (MCU).
The parameter determination circuit 101 may transmit the correction parameter to the main control circuit 204, and the main control circuit 204 may transmit the correction parameter to the image processing circuit 201.
Referring to fig. 8, the laser projection apparatus may further include an object interface circuit 205 on the display panel 20, one end of the object interface circuit 205 is connected to the connector 107, and the other end of the object interface circuit 205 is connected to the main control circuit 204 and the image processing circuit 201, respectively. The target interface circuit 205 is configured to transmit data transmitted by the first interface to the main control circuit 204 and the image processing circuit 201, respectively. The target interface circuit 205 may be a USB interface circuit.
The target interface circuit 205 is connected to the connector 107, the main control circuit 204, and the image processing circuit 201 based on the USB protocol, respectively.
Referring to fig. 6 and 8, the laser projection apparatus may further include a second interface 109 and a third interface 110 on the main board 10, wherein one end of the second interface 109 is connected to the USB interface circuit 103, and the other end is used for connecting an external device. The second interface 109 is used for transmitting data transmitted from an external device to the control circuit 106. One end of the third interface 110 is connected to the USB interface circuit 103, and the other end is used for connecting to an external device. The third interface 110 is used for transmitting data transmitted by an external device to the control circuit 106.
Referring to fig. 6 and 8, the laser projection apparatus may further include a fourth interface 111, a fifth interface 112, and a sixth interface 113 on the main board 10. One end of the fourth interface 111 is connected to the control circuit 106, and the other end is used to establish a communication connection with an external device, for example, the communication connection may be a WIFI connection. For example, the control circuit 106 may establish a wireless fidelity (WIFI) connection with the mobile terminal through the fourth interface 111, and may receive network data sent by the mobile terminal. The network data may be, for example, a captured image, which the control circuit 106 may in turn send to the parameter determination circuit 101.
One end of the fifth interface 112 is connected to the control circuit 106, and the fifth interface 112 is configured to receive voice data and transmit the received voice data to the control circuit 106.
One end of the sixth interface 113 is connected to the control circuit 106, and the other end of the sixth interface 113 establishes a communication connection with the camera on the projection screen and can receive a video image collected by the camera.
Referring to fig. 6 and 8, the control circuit 106 is further connected to the first memory 115, and the control circuit 106 is configured to receive the storage data transmitted by the first memory 115. The laser projection device may further comprise a second memory 116, the second memory 116 being connected to a display control circuit 202, the display control circuit 202 being adapted to store pixel values of pixels in the projected image in the second memory 116.
To sum up, the embodiment of the present disclosure provides a laser projection apparatus, where the image processing circuit may correct the second projection image based on the correction parameter determined by the parameter determination circuit, and then the display control circuit projects the corrected second projection image onto the projection screen, so as to correct the position of the second projection image on the projection screen, and avoid the projection image from exceeding the projection screen or the projection image displayed on the projection screen from being deformed, thereby ensuring the display effect of the projection image.
Moreover, because the parameter determination circuit is integrated on the control chip of the main board, compared with the case that different functions (namely, a function of determining the target offset and a function of determining the correction position) of the parameter determination circuit are respectively integrated on different chips, the internal structure of the laser projection equipment is simplified.
Referring to fig. 4 and 7, an embodiment of the present disclosure provides an image correction system, which may include a laser projection device 00 and a mobile terminal 01, where the mobile terminal 01 is configured to capture a projection screen, obtain a captured image, and send the captured image to a parameter determination circuit 101 of the laser projection device 00.
In the disclosed embodiments, the terms "first," second, "" third, "" fourth, "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" in the embodiments of the present disclosure means two or more. "and/or" in the embodiment of the present disclosure is only one kind of association relationship describing an association object, and indicates that three types of relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A laser projection device, characterized in that the laser projection device comprises: the device comprises a parameter determining circuit, an image processing circuit, a display control circuit, a light valve and a projection lens; the parameter determination circuit is integrated in a control chip of a mainboard of the laser projection equipment;
the parameter determining circuit is connected with the image processing circuit and is used for determining a correction parameter based on a shot image and transmitting the correction parameter to the image processing circuit, wherein the shot image is obtained by shooting a projection screen on which a first projection image is displayed;
the image processing circuit is connected with the display control circuit and is used for correcting the second projection image to be displayed based on the correction parameter and transmitting the corrected second projection image to the display control circuit;
the display control circuit is used for generating a light valve control signal based on the corrected second projection image, controlling the light valve to modulate a light beam irradiated to the surface of the light valve into an image light beam based on the light valve control signal, and controlling the light valve to project the image light beam to the projection lens based on the light valve control signal;
the projection lens is used for projecting the image light beam to the projection screen so as to correct the projection position of the second projection image on the projection screen.
2. The laser projection device of claim 1, wherein the display panel in the laser projection device comprises a Digital Light Processing (DLP) chip, and the image processing circuit is integrated in the DLP chip.
3. The laser projection device of claim 1, wherein the parameter determination circuit and the image processing circuit are connected based on a Universal Serial Bus (USB) protocol.
4. The laser projection device of claim 3, further comprising: the USB interface circuit, the switch circuit and the switch control circuit are positioned on the mainboard;
the USB interface circuit is respectively connected with the parameter determining circuit and the first end of the switch circuit, the second end of the switch circuit is connected with the image processing circuit, and the control end of the switch circuit is connected with the switch control circuit;
the parameter determining circuit is configured to transmit the correction parameter to the USB interface circuit, the USB interface circuit is configured to transmit the correction parameter to the switch circuit, and the switch circuit is configured to control the first terminal and the second terminal to be turned on in response to a switch signal sent by the switch control circuit, and transmit the correction parameter to the image processing circuit.
5. The laser projection device of claim 4, further comprising: a connector on the motherboard;
the connector is connected with the second end of the switch circuit and the image processing circuit based on the USB protocol, and the switch circuit is used for transmitting the correction parameters to the image processing circuit through the connector.
6. The laser projection device of claim 1, wherein the parameter determination circuit and the image processing circuit are connected based on an I2C protocol.
7. The laser projection device of claim 6, further comprising: a main control circuit on the display panel, the main control circuit being connected to the parameter determination circuit and the image processing circuit, respectively, based on the I2C protocol;
the parameter determining circuit is used for transmitting the correction parameters to the image processing circuit through the main control circuit.
8. The laser projection device of claim 7, wherein the master control circuit is a Micro Control Unit (MCU).
9. The laser projection device of any one of claims 1 to 8, wherein the control chip is a system on chip (SoC).
10. An image correction system, characterized in that the system comprises: a mobile terminal, and a laser projection device according to any one of claims 1 to 9;
the mobile terminal is used for shooting a projection screen to obtain a shot image, and sending the shot image to the parameter determining circuit of the laser projection equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110573759.9A CN113271447B (en) | 2021-05-25 | 2021-05-25 | Laser projection apparatus and image correction system |
| PCT/CN2022/082299 WO2022247419A1 (en) | 2021-05-25 | 2022-03-22 | Laser projection device and image correction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110573759.9A CN113271447B (en) | 2021-05-25 | 2021-05-25 | Laser projection apparatus and image correction system |
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| CN113271447B CN113271447B (en) | 2022-10-25 |
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| WO (1) | WO2022247419A1 (en) |
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| WO2022247419A1 (en) * | 2021-05-25 | 2022-12-01 | 青岛海信激光显示股份有限公司 | Laser projection device and image correction system |
| WO2023115857A1 (en) * | 2021-12-20 | 2023-06-29 | 青岛海信激光显示股份有限公司 | Laser projection device, and projection image correction method |
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| CN113315959B (en) * | 2021-06-03 | 2022-11-25 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and projected image correction method |
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| CN113271447B (en) | 2022-10-25 |
| WO2022247419A1 (en) | 2022-12-01 |
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