CN112954285A - Display method of projection picture and laser projection equipment - Google Patents
Display method of projection picture and laser projection equipment Download PDFInfo
- Publication number
- CN112954285A CN112954285A CN202110172218.5A CN202110172218A CN112954285A CN 112954285 A CN112954285 A CN 112954285A CN 202110172218 A CN202110172218 A CN 202110172218A CN 112954285 A CN112954285 A CN 112954285A
- Authority
- CN
- China
- Prior art keywords
- projection
- target object
- laser
- picture
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
Abstract
The application discloses a display method of a projection picture and laser projection equipment, and belongs to the field of projection display. After the laser projection equipment determines that the projection screen is shielded by the target object, the brightness of the sub-picture projected and displayed to the shielding area in the projection picture can be reduced. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
Description
Technical Field
The present disclosure relates to the field of projection display, and in particular, to a display method of a projection screen and a laser projection apparatus.
Background
At present, after laser emitted by a laser projection device is projected onto a projection screen, a projection picture can be projected onto the projection screen. However, since the laser light emitted from the laser projection apparatus has high brightness, the laser light may cause damage to a human body when a user is close to the projection screen.
Disclosure of Invention
The embodiment of the disclosure provides a display method of a projection picture and a laser projection device, which can solve the problem that in the related art, when a user is close to a projection screen, the laser may cause harm to a human body. The technical scheme is as follows:
in one aspect, a method for displaying a projection picture is provided, and is applied to a laser projection device, where the laser projection device includes: a projection light source; the method comprises the following steps:
projecting and displaying a projection picture on a projection screen through the projection light source;
if the projection screen is detected to be shielded by the target object, determining a shielded area shielded by the target object in the projection screen;
and reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
Optionally, the reducing the brightness of the sub-picture projected and displayed to the occlusion region in the projection picture includes:
reducing the pixel value of a first target pixel in the projection picture;
wherein the projection position of the first target pixel is located within the occlusion region.
Optionally, the laser projection apparatus further includes: an infrared light source; the method further comprises the following steps:
displaying a detection picture on the projection screen through the infrared light source;
acquiring a shot image obtained by shooting the detection picture by an infrared camera;
and if a second target pixel with a pixel value outside the pixel value range exists in the shot image, determining that the projection screen is shielded by the target object.
Optionally, the determining an occlusion region of the projection screen includes:
determining the projection position of the second target pixel on the projection screen in the shot image;
and determining the area of the projection position of the second target pixel in the projection screen as the occlusion area.
Optionally, the laser projection apparatus further includes: a ranging sensor; the method further comprises the following steps:
transmitting a detection signal by the ranging sensor;
and detecting whether the projection screen is shielded by a target object or not according to the reflected detection signal received by the ranging sensor.
Optionally, the target is a human;
the occlusion region includes: the projection area is an area which is blocked by the face of the target object, and/or an area which is blocked by the body of the target object.
Optionally, the method further includes:
and if the position of the target object is detected to be changed, updating the shielding area based on the changed position of the target object.
In another aspect, there is provided a laser projection apparatus including: a projection light source; the laser projection device is configured to:
projecting and displaying a projection picture on a projection screen through the projection light source;
if the projection screen is detected to be shielded by the target object, determining a shielded area shielded by the target object in the projection screen;
and reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
Optionally, the laser projection device is configured to:
reducing the pixel value of a first target pixel in the projection picture;
wherein the projection position of the first target pixel is located within the occlusion region.
Optionally, the laser projection apparatus is further configured to:
and if the position of the target object is detected to be changed, updating the shielding area based on the changed position of the target object.
In yet another aspect, there is provided a laser projection apparatus including: the projection screen display device comprises a memory, a processor and a computer program stored on the memory, wherein the processor realizes the projection screen display method according to the above aspect when executing the computer program.
In still another aspect, a computer-readable storage medium is provided, in which instructions are stored, and the instructions are loaded and executed by a processor to implement the method for displaying a projection screen according to the above aspect.
In still another aspect, a computer program product containing instructions is provided, which when run on the computer, causes the computer to execute the method for displaying a projection screen according to the above aspect.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the embodiment of the disclosure provides a display method of a projection picture and a laser projection device. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
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 flowchart of a display method of a projection picture according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another display method of a projection screen according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a projection screen occluded by a target object according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another projection screen occluded by a target object according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of a projection screen provided by an embodiment of the present disclosure being unobstructed by a target object;
FIG. 6 is a schematic view of another projection screen provided by the embodiment of the present disclosure being unobstructed by a target object;
FIG. 7 is a flowchart for determining whether a projection screen is occluded according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an infrared camera disposed on a laser projection device according to an embodiment of the disclosure;
FIG. 9 is a schematic diagram of a laser projection device including a ranging sensor provided in an embodiment of the present disclosure;
FIG. 10 is a schematic view of an occlusion region provided by an embodiment of the present disclosure;
FIG. 11 is a schematic diagram of determining an occlusion region according to an embodiment of the present disclosure;
FIG. 12 is a schematic view of another occlusion region provided by embodiments of the present disclosure;
FIG. 13 is a schematic diagram of yet another occlusion region provided by embodiments of the present disclosure;
fig. 14 is a schematic structural diagram of a 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 flowchart of a display method of a projection picture according to an embodiment of the present disclosure. The display method can be applied to laser projection equipment. The laser projection device may include a projection light source, which may be a visible light projection light source, and which may be a laser projection light source. For example, the projection light source may include at least one of a red projection light source, a green projection light source, and a blue projection light source. As shown in fig. 1, the method may include:
And 102, detecting whether the projection screen is blocked by the target object.
The laser projection equipment can periodically or in real time detect whether the projection screen is blocked by a target object in the process of projecting and displaying a projection picture on the projection screen through the projection light source. If the laser projection device detects that the projection screen is blocked by the target object, the laser projection device may execute step 103. If it is detected that the projection screen is not occluded by the target object, the laser projection apparatus may continue to perform step 102.
And 103, determining a shielding area shielded by the target object in the projection screen.
After determining that the projection screen is occluded by the target object, the laser projection device may determine an occlusion region in the projection screen that is occluded by the target object.
And 104, reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
After the laser projection equipment determines the sheltered area sheltered by the target object in the projection screen, the brightness of the sub-picture projected and displayed to the sheltered area in the projection picture can be reduced.
To sum up, the embodiment of the present disclosure provides a method for displaying a projection image, where after it is determined that a projection screen is shielded by a target object, a laser projection device may reduce brightness of a sub-image projected and displayed to a shielding area in the projection image. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
Fig. 2 is a flowchart of another display method of a projection screen according to an embodiment of the present disclosure. The method may be applied to a laser projection device, which may include a projection light source, which may be a visible light projection light source, and which may be a laser projection light source. For example, the projection light source may include at least one of a red projection light source, a green projection light source, and a blue projection light source. As shown in fig. 2, the method may include:
The laser projection device can project and display a projection picture on a projection screen through the projection light source.
The laser projection equipment can periodically or real-timely detect whether the projection screen is blocked by the target object or not in the process of projecting and displaying the projection picture. Referring to fig. 3 and 4, if the laser projection apparatus 10 detects that the projection area 20 is blocked by the object 001, it can be determined that the object 001 is located in the laser optical path 002 emitted by the laser projection apparatus 10. At this time, in order to avoid the laser from damaging the object 001 and ensure the display effect of the projection screen, the laser projection apparatus may execute step 203.
Referring to fig. 5 and 6, if the laser projection apparatus 10 detects that the projection area 20 is not blocked by the object 001, it may be determined that the object 001 is not located in the laser optical path 002 emitted from the laser projection apparatus 10, and the laser projection apparatus 10 may continue to perform step 202.
As an optional implementation manner of the embodiment of the present disclosure, the laser projection apparatus may further include an infrared light source, and referring to fig. 7, the process of detecting whether the projection area is blocked by the target by the laser projection apparatus may include:
The detection picture may be a fixed picture pre-stored in the laser projection device, and a pixel value of each pixel in the detection picture is within a pixel value range, which may be a fixed range pre-stored in the laser projection device. Alternatively, the pixel value of each pixel in the detection picture may include a red pixel value, a green pixel value, and a blue pixel value, and accordingly, the pixel value range may include a red pixel value range, a green pixel value range, and a blue pixel value range. For example, the red pixel value R, the green pixel value G, and the blue pixel value B of each pixel in the detection picture are 255, 0, and 0, respectively.
In the embodiment of the present disclosure, the laser projection apparatus may periodically or in real time project and display a detection picture on the projection screen through the infrared light source while projecting and displaying a projection picture on the projection screen through the projection light source.
Because the laser projection device projects the detection picture to the projection screen through the infrared light source, a user cannot see the detection picture projected and displayed on the projection screen when watching the projection picture projected and displayed by the laser projection device through the projection light source. Therefore, the continuity of watching the projection picture by the user is ensured, and the user experience is better.
Referring to fig. 8, the infrared camera 30 may be fixedly disposed on the laser projection device 10. The laser projection device may send a shooting instruction to the infrared camera 30 after projecting and displaying the detection picture on the projection screen. The infrared camera 30 may photograph the detection picture to obtain a photographed image in response to the photographing instruction, and transmit the photographed image to the laser projection apparatus 10.
Alternatively, the infrared camera 30 may be independent of the laser projection apparatus 10, and the user may control the infrared camera 30 to capture the detection picture to obtain a captured image after determining that the projection screen is blocked by the target object, and control the infrared camera 30 to send the captured image to the laser projection apparatus 10. That is, the infrared camera provided in the embodiments of the present disclosure only needs to be able to capture a detection picture. The setting position of the infrared camera is not limited in the embodiment of the disclosure.
The laser projection apparatus may acquire a pixel value of each pixel in the captured image after acquiring the captured image, and may detect whether the pixel value of each pixel is outside a pixel value range. Step 2024 may be performed if the laser projection device detects that there is a second target pixel in the captured image whose pixel value is outside the pixel value range. If the laser projection device detects that the pixel values of all the pixels in the captured image are within the pixel value range, step 2025 may be performed.
Optionally, after the laser projection device acquires the pixel value of each pixel in the captured image, it may first detect whether there is a second target pixel whose red pixel value is outside the range of the red pixel value, and if so, the laser projection device may determine that the projection screen is blocked by the target object. If not, the laser projection device may detect whether there is a second target pixel whose green pixel value is outside the range of green pixel values, and if so, the laser projection device may determine that the projection screen is blocked by the target object. If not, the laser projection device may continue to detect whether there is a second target pixel whose blue pixel value is outside the range of the blue pixel value, and if so, the laser projection device may determine that the projection screen is blocked by the target object. If not, the laser projection device may determine that the projection screen is not obscured by the target object.
In the disclosed embodiment, the range of pixel values for each color may include a first range and a second range. The first range may be a range determined based on pixel values of the color in the detection screen, and the second range may be a range determined by the laser projection apparatus based on pixel values of pixels located in other areas in the captured detection screen when the detection screen is projected to the other areas other than the projection area. Alternatively, the other area may be a frame of the projection screen.
The pixel value range of each color can include the second range, so that the problem that the projection area is determined to be shielded by the target object by the laser projection equipment when the detection picture is projected to other areas can be effectively avoided, and the reliability of determining whether the projection area is shielded by the target object is improved.
For example, if the pixel value of each pixel in the detection picture is (255, 0, 0), and the pixel value range of red is a range including the first range (254, 255) and the second range (100, 103), if the laser projection device determines that there is a second target pixel in the captured image whose red pixel value is outside the red pixel value range, the laser projection device may determine that the projection screen is blocked by the target object.
The laser projection device can determine that the projection screen is blocked by the target object after detecting that a second target pixel with a pixel value outside the pixel value range exists in the shot image.
After the laser projection device detects that the pixel values of all pixels in the shot image are located in the pixel value range, the projection screen can be determined not to be shielded by the target object.
As another optional implementation manner of the embodiment of the present disclosure, the laser projection device may further include a distance measuring sensor, and after the laser projection device projects and displays the detection picture on the projection screen, the laser projection device may emit a detection signal through the distance measuring sensor, and may detect whether the projection screen is blocked by the target object according to the reflected detection signal received by the distance measuring sensor. Alternatively, the ranging sensor may be a radar sensor or a distance sensor.
Referring to fig. 9, the distance measuring sensor 101 may be fixedly disposed on the housing of the laser projection device 10. Alternatively, the range sensor 101 may be located on a side of the housing of the laser projection device 10 adjacent to the projection area 20. Alternatively, the distance measuring sensor 101 may be located at an upper side of the housing of the laser projection apparatus 10, the upper side being a side opposite to the bearing surface of the housing of the laser projection apparatus 10.
In the disclosed embodiments, the detection area of the ranging sensor may be equal to the projection area of the projection screen. Optionally, if the projection screen is quadrilateral, the maximum angle of the detection area of the distance measuring sensor on the first plane may be equal to a first included angle, the maximum angle of the detection area on the second plane may be equal to a second included angle, the first included angle is an included angle between a first connection line and a second connection line, and the second included angle is an included angle between a third connection line and a fourth connection line. The first connecting line is a connecting line between the distance measuring sensor and the upper left vertex of the projection screen, and the second connecting line is a connecting line between the distance measuring sensor and the upper right vertex of the projection screen. The third connecting line is a connecting line between the middle point of the first side of the projection screen and the distance measuring sensor, the fourth connecting line is a connecting line between the middle point of the second side of the projection area and the distance measuring sensor, the first side is a side where the upper left vertex and the upper right vertex of the projection screen are located, and the second side is parallel to the first side.
The laser projection device may receive the reflected detection signal via the ranging sensor and may determine the distance based on the reflected detection signal via the ranging sensor. The laser projection device may then detect whether the distance is equal to a distance threshold. If the distance is not equal to the distance threshold, the laser projection device may determine that the projection screen is obscured by the target object. If the distance is equal to the distance threshold, the laser projection device may determine that the projection screen is not occluded.
Wherein the distance threshold is used to indicate a distance between the ranging sensor and the projection screen. The distance threshold may be determined by the ranging sensor based on the received detection signal when the laser projection device emits the detection signal through the ranging sensor under the condition that the user fixes the relative position of the laser projection device and the projection screen is not shielded by the target object. Also, the laser projection device may store the distance threshold.
And step 203, determining the projection position of the second target pixel in the shot image on the projection screen.
The laser projection device can determine the projection position of the second target pixel in the shot image on the projection screen after determining that the projection screen is blocked by the target object.
Optionally, a perspective transformation coefficient of the infrared camera may be stored in the laser projection device in advance, where the perspective transformation coefficient is related to a shooting position of the infrared camera, a distance between the infrared camera and the projection screen, and a resolution of the infrared camera. The laser projection device may determine a projection position of the second target pixel on the projection screen based on the perspective transformation coefficient and a photographing position of the second target pixel in the photographed image. Thereby improving the accuracy of the determination of the projection position of the second target pixel on the projection screen.
The projection screen may be a quadrilateral, the projection position of the second target pixel on the projection screen may be the position in the screen coordinate system, the origin of the screen coordinate system is any vertex 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 column direction of the projection screen.
And step 204, determining the area where the projection position of the second target pixel in the projection screen is located as an occlusion area.
After determining the projection position of the second target pixel on the projection screen, the laser projection device may determine an area in the projection area where the projection position of the second target pixel is located as an occlusion area.
In the embodiment of the present disclosure, if the target object is a human, the occlusion region determined by the laser projection device may include a region of the projection region that is occluded by a human face of the target object and/or a region of the projection region that is occluded by a body of the target object. Wherein, the body of the object refers to a part except the human face of the object.
Referring to fig. 10, the laser projection apparatus may determine an area occluded by the face and the body of the target object in the area surrounded by the projection position of the second target pixel as an occlusion area 003.
Alternatively, referring to fig. 11, the laser projection apparatus may determine, as an occlusion region 003, a region occluded by a face of the target object in a region surrounded by the projection positions of the second target pixels.
Alternatively, the laser projection apparatus may determine, as the occlusion region, a region occluded by the body of the target object in a region surrounded by the projection positions of the second target pixels.
Alternatively, the laser projection device may determine a region surrounded by the projection positions of the second target pixels, and determine a regular region including the region based on the vertex of the region. Then, the laser projection device may determine, as an occlusion region, a region in the regular region that is occluded by the face of the target object, and/or the laser projection device may determine, as an occlusion region, a region in the regular region that is occluded by the body of the target object. The regular area may be a circle or a polygon, and the polygon may be a quadrangle or a triangle, for example.
Alternatively, referring to fig. 12 and 13, if the origin O of the screen coordinate system XY is the lower left vertex of the projection screen, the horizontal axis X of the screen coordinate system is parallel to the pixel row direction of the projection screen, and the vertical axis Y of the screen coordinate system is parallel to the pixel column direction of the projection screen. After the laser projection apparatus determines the region surrounded by the projection positions of the second target pixels, a straight line y, which is-x + b, may be determined based on the position (x1, y1) where the top right vertex a point of the region is located. If x1 is 30 and y1 is 30, x1 is 30, y1 is 30, and the straight line y is-x + b, and 30 is determined to be-30 + b, and further b is 60, so that the laser projection apparatus can determine the straight line y is-x + 60. The laser projection apparatus may determine an area surrounded by the straight line Y and the horizontal axis X and the vertical axis Y as a regular area, and determine an area in the regular area, which is occluded by the face and the body of the target object, as an occlusion area 003.
And step 205, reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
After the laser projection equipment determines the occlusion area, the brightness of the sub-picture projected and displayed to the occlusion area in the projection picture can be reduced.
Optionally, the laser projection device may reduce a pixel value of a first target pixel in the projection picture, where a projection position of the first target pixel is located in the occlusion region, that is, the first target pixel is a pixel in the sub-picture.
The laser projection device may reduce the pixel value of the first target pixel in the projection screen by a target percentage, for example, the target percentage may be 30% or 100%. Wherein the target percentage may be a fixed value pre-stored in the laser projection device.
For example, if the target percentage is 100%, the laser projection device decreases the pixel value of the first target sub-pixel to 0, that is, decreases the red pixel value R of the first target pixel to 0, decreases the green pixel value G of the first target pixel to 0, and decreases the blue pixel value B of the first target pixel to 0.
In the embodiment of the disclosure, after the brightness of the sub-picture projected and displayed to the shielding area in the projection picture is reduced, the laser projection device may detect whether the position of the target object changes in real time or periodically. If the position of the target object changes, the laser projection device may determine that the occlusion area changes, and the laser projection device may execute step 207. If the position of the target object does not change, the laser projection apparatus may determine that the occlusion region does not change, and the laser projection apparatus may continue to perform step 205, that is, the laser projection apparatus may keep the occlusion region unchanged and reduce the brightness of the sub-picture projected and displayed to the occlusion region in the projection picture.
Alternatively, the laser projection apparatus may detect whether the distance between the target object and the ranging sensor changes by the ranging sensor. If the position of the target object changes, the laser projection equipment can determine that the position of the target object changes. If the position of the target object is not changed, the laser projection equipment can determine that the position of the target object is not changed.
And step 207, updating the occlusion area based on the changed position of the target object.
In the embodiment of the present disclosure, after determining that the position of the target object changes, the laser projection device may update the occlusion region based on the changed position of the target object, and then the laser projection device may reduce the brightness of the sub-picture projected and displayed to the updated occlusion region in the projection picture. The step 202 to the step 204 may be referred to in the process of updating the occlusion region based on the changed position of the target object by the laser projection device, and details of the embodiment of the present disclosure are not repeated herein.
It should be noted that, since the ranging sensor emits the detection signals at different positions on the detection area thereof, the ranging sensor may receive the reflected detection signals at different positions on the detection area thereof, so that the laser projection apparatus may determine a plurality of distances and an azimuth angle corresponding to each distance by the detection signals reflected by the target object received at different positions by the ranging sensor, where the azimuth angle may be an included angle between the target object and the ranging sensor. After determining that the projection screen is occluded, the laser projection device may determine an occlusion region based on the determined distances that are less than the distance threshold and the azimuth angles corresponding to the distances. Optionally, the laser projection device may pre-store a corresponding relationship between the distance, the azimuth angle, and the projection position, and the laser projection device may determine, based on the corresponding relationship, a plurality of projection positions corresponding to a plurality of distances smaller than a distance threshold and an azimuth angle corresponding to the distance, and may determine the occlusion area based on the plurality of projection positions. Therefore, the laser projection equipment can determine the occlusion area based on the shot image shot by the infrared camera and also can determine the occlusion area through the ranging sensor.
It should be further noted that, the order of the steps of the display method for the projection picture provided by the embodiment of the present disclosure may be appropriately adjusted, and the steps may also be deleted according to the situation. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
To sum up, the embodiment of the present disclosure provides a method for displaying a projection image, where when it is determined that a projection screen is shielded by a target object, a laser projection device may reduce brightness of a sub-image projected and displayed to a shielding area in the projection image. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
The embodiment of the present disclosure also provides a laser projection apparatus, and referring to fig. 14, the laser projection apparatus 10 may include a projection light source 102, an infrared light source 103, a first light modulation component 104, a second light modulation component 105, a main control circuit 106, and a projection lens 107. Fig. 14 shows that the laser projection apparatus is provided with the infrared camera 30 therein, and the laser projection apparatus may further include a distance measuring sensor 101.
The first light modulation component 104 and the second light modulation component 105 may be digital micro-mirror devices (DMDs), Liquid Crystal Displays (LCDs), or Liquid Crystal On Silicon (LCOS) devices.
The projection light source 102 is used for emitting a laser beam and transmitting the laser beam to the first light modulation component 104. The infrared light source 103 is used for emitting an infrared light beam and transmitting the infrared light beam to the second light modulation component 105.
If the first light adjusting assembly 104 is a digital micro-mirror device, the digital micro-mirror device may include a plurality of mirrors arranged in an array, and each mirror corresponds to a pixel in the projected image. In the process that the laser projection device adjusts the projection position of the first target pixel in the second projection picture from the initial projection position to the outside of the blocking area, if the first target pixel is located in the mth row and the nth column in the second projection picture, the laser projection device needs to translate the first target pixel by x rows of pixels along the pixel column direction, so that the first target pixel is located outside the blocking area, and the laser projection device needs to adjust the lens corresponding to N pixels in the nth column in the second projection picture to the lens corresponding to N-x pixels in the nth column. Wherein, N is the number of pixel columns in the second projection image, N is a positive integer greater than 1, and x is a positive integer less than N.
The main control circuit 106 is configured to generate the first control signal according to a pixel value of a projection image, control the first light modulation component 104 according to the first control signal to modulate the light beam irradiated onto the surface of the first light modulation component into a first image light beam, and transmit the first image light beam to the projection lens 107. The projection lens 107 is configured to transmit the first image beam to a projection screen, so as to display a projection picture on the projection screen by projection.
The main control circuit 106 is further configured to generate the second control signal according to the pixel value of the detected image, control the second light modulation component 105 to modulate the light beam irradiated to the surface thereof into a second image light beam according to the second control signal, and transmit the second image light beam to the projection lens 107. The projection lens 107 is configured to transmit the second image beam to a projection screen, so as to project and display the detection picture on the projection screen.
The main control circuit 106 is connected to the infrared camera 30 and the distance measuring sensor 101, and the main control circuit 106 may perform the steps 101 to 104, and the steps 201 to 206.
Referring to fig. 3, 5, 8, 9, and 14, embodiments of the present disclosure provide a laser projection device 10 that may be used to:
and projecting and displaying a projection picture on a projection screen through a projection light source.
And if the projection screen is detected to be shielded by the target object, determining a shielded area shielded by the target object in the projection screen.
And reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
To sum up, the embodiment of the present disclosure provides a method for displaying a projection image, where when it is determined that a projection screen is shielded by a target object, a laser projection device may reduce brightness of a sub-image projected and displayed to a shielding area in the projection image. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
Optionally, the laser projection device 10 is configured to:
and reducing the pixel value of the first target pixel in the projection picture.
And the projection position of the first target pixel is positioned in the shielding area.
Optionally, the laser projection apparatus 10 further includes: an infrared light source 103. Optionally, the laser projection device 10 is configured to:
and displaying the detection picture on the projection screen through the infrared light source.
Acquiring a shot image obtained by shooting a detection picture by an infrared camera;
and if a second target pixel with the pixel value being out of the pixel value range exists in the shot image, determining that the projection screen is shielded by the target object.
Optionally, the laser projection device 10 is configured to:
determining the projection position of a second target pixel in the shot image on the projection screen;
and determining the area of the projection position of the second target pixel in the projection screen as an occlusion area.
Optionally, the laser projection apparatus further includes: a ranging sensor; the laser projection device is used for:
transmitting a detection signal through a ranging sensor;
and detecting whether the projection screen is shielded by the target object or not according to the reflected detection signal received by the ranging sensor.
Optionally, the target object is a human; the occlusion region includes: the projection area is an area that is blocked by the face of the target object and/or an area that is blocked by the body of the target object.
Optionally, the laser projection device 10 is further configured to:
and if the position of the target object is detected to be changed, updating the shielding area based on the changed position of the target object.
To sum up, the embodiment of the present disclosure provides a method for displaying a projection image, where when it is determined that a projection screen is shielded by a target object, a laser projection device may reduce brightness of a sub-image projected and displayed to a shielding area in the projection image. Therefore, the damage of the laser emitted by the laser projection equipment to the target object is effectively reduced.
The disclosed embodiment provides a laser projection apparatus, including: memory, a processor and a computer program stored on the memory, the processor implementing the above-described method embodiments (e.g. the embodiments shown in any of fig. 1, fig. 2 or fig. 7) when executing the computer program.
The disclosed embodiments provide a computer-readable storage medium having stored therein instructions that are loaded and executed by a processor to implement the above-described method embodiments (e.g., the embodiments shown in any of fig. 1, fig. 2, or fig. 7).
The disclosed embodiments provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the above-described method embodiments (e.g. the embodiments shown in any of fig. 1, fig. 2 or fig. 7).
In the disclosed embodiments, the terms "first," "second," "third," and "fourth" 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.
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 display method of a projection picture is applied to a laser projection device, and the laser projection device comprises: a projection light source; the method comprises the following steps:
projecting and displaying a projection picture on a projection screen through the projection light source;
if the projection screen is detected to be shielded by the target object, determining a shielded area shielded by the target object in the projection screen;
and reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
2. The method of claim 1, wherein the reducing the brightness of the sprite projected onto the occlusion region in the projection screen comprises:
reducing the pixel value of a first target pixel in the projection picture;
wherein the projection position of the first target pixel is located within the occlusion region.
3. The method of claim 1, wherein the laser projection device further comprises: an infrared light source; the method further comprises the following steps:
displaying a detection picture on the projection screen through the infrared light source;
acquiring a shot image obtained by shooting the detection picture by an infrared camera;
and if a second target pixel with a pixel value outside the pixel value range exists in the shot image, determining that the projection screen is shielded by the target object.
4. The method of claim 3, wherein determining the occlusion region of the projection screen comprises:
determining the projection position of the second target pixel on the projection screen in the shot image;
and determining the area of the projection position of the second target pixel in the projection screen as the occlusion area.
5. The method of claim 1, wherein the laser projection device further comprises: a ranging sensor; the method further comprises the following steps:
transmitting a detection signal by the ranging sensor;
and detecting whether the projection screen is shielded by a target object or not according to the reflected detection signal received by the ranging sensor.
6. The method of any one of claims 1 to 5, wherein the target is a human;
the occlusion region includes: the projection area is an area which is blocked by the face of the target object, and/or an area which is blocked by the body of the target object.
7. The method of any of claims 1 to 5, further comprising:
and if the position of the target object is detected to be changed, updating the shielding area based on the changed position of the target object.
8. A laser projection device, characterized in that the laser projection device comprises: a projection light source; the laser projection device is configured to:
projecting and displaying a projection picture on a projection screen through the projection light source;
if the projection screen is detected to be shielded by the target object, determining a shielded area shielded by the target object in the projection screen;
and reducing the brightness of the sub-picture projected and displayed to the shielding area in the projection picture.
9. The laser projection device of claim 8, wherein the laser projection device is configured to:
reducing the pixel value of a first target pixel in the projection picture;
wherein the projection position of the first target pixel is located within the occlusion region.
10. The laser projection device of claim 8, wherein the laser projection device is further configured to:
and if the position of the target object is detected to be changed, updating the shielding area based on the changed position of the target object.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310238949.4A CN116260953A (en) | 2021-02-08 | 2021-02-08 | Laser projection device |
| CN202110172218.5A CN112954285B (en) | 2021-02-08 | 2021-02-08 | Display method of projection picture and laser projection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110172218.5A CN112954285B (en) | 2021-02-08 | 2021-02-08 | Display method of projection picture and laser projection equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310238949.4A Division CN116260953A (en) | 2021-02-08 | 2021-02-08 | Laser projection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112954285A true CN112954285A (en) | 2021-06-11 |
| CN112954285B CN112954285B (en) | 2023-01-24 |
Family
ID=76244155
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310238949.4A Pending CN116260953A (en) | 2021-02-08 | 2021-02-08 | Laser projection device |
| CN202110172218.5A Active CN112954285B (en) | 2021-02-08 | 2021-02-08 | Display method of projection picture and laser projection equipment |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310238949.4A Pending CN116260953A (en) | 2021-02-08 | 2021-02-08 | Laser projection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN116260953A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113840125A (en) * | 2021-08-30 | 2021-12-24 | 展讯半导体(南京)有限公司 | Projector control method, projector control device, projector, and storage medium |
| CN117119160A (en) * | 2023-10-24 | 2023-11-24 | 合肥联宝信息技术有限公司 | Projection control method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106709954A (en) * | 2016-12-27 | 2017-05-24 | 上海唱风信息科技有限公司 | Method for masking human face in projection region |
| CN109309761A (en) * | 2018-10-30 | 2019-02-05 | 努比亚技术有限公司 | Emergent calling method, mobile terminal and computer readable storage medium |
| CN110211549A (en) * | 2019-04-25 | 2019-09-06 | 深圳市泰衡诺科技有限公司 | A kind of screen brightness regulation method, device, terminal and storage medium |
| CN211318955U (en) * | 2019-12-31 | 2020-08-21 | 广州志胜游艺设备有限公司 | Projection interaction device based on laser positioning |
| CN112198747A (en) * | 2020-11-06 | 2021-01-08 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and control method thereof |
-
2021
- 2021-02-08 CN CN202310238949.4A patent/CN116260953A/en active Pending
- 2021-02-08 CN CN202110172218.5A patent/CN112954285B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106709954A (en) * | 2016-12-27 | 2017-05-24 | 上海唱风信息科技有限公司 | Method for masking human face in projection region |
| CN109309761A (en) * | 2018-10-30 | 2019-02-05 | 努比亚技术有限公司 | Emergent calling method, mobile terminal and computer readable storage medium |
| CN110211549A (en) * | 2019-04-25 | 2019-09-06 | 深圳市泰衡诺科技有限公司 | A kind of screen brightness regulation method, device, terminal and storage medium |
| CN211318955U (en) * | 2019-12-31 | 2020-08-21 | 广州志胜游艺设备有限公司 | Projection interaction device based on laser positioning |
| CN112198747A (en) * | 2020-11-06 | 2021-01-08 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and control method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113840125A (en) * | 2021-08-30 | 2021-12-24 | 展讯半导体(南京)有限公司 | Projector control method, projector control device, projector, and storage medium |
| WO2023030090A1 (en) * | 2021-08-30 | 2023-03-09 | 展讯半导体(南京)有限公司 | Projector control method and apparatus, projector, and storage medium |
| CN117119160A (en) * | 2023-10-24 | 2023-11-24 | 合肥联宝信息技术有限公司 | Projection control method and device, electronic equipment and storage medium |
| CN117119160B (en) * | 2023-10-24 | 2024-02-06 | 合肥联宝信息技术有限公司 | Projection control method and device, electronic equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116260953A (en) | 2023-06-13 |
| CN112954285B (en) | 2023-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10218951B2 (en) | MEMS scan controlled keystone and distortion correction | |
| CN113055663B (en) | Projection image correction method and laser projection device | |
| US7210786B2 (en) | Projection display device | |
| CN100426129C (en) | Image processing system, projector,and image processing method | |
| CN114401390A (en) | Projection equipment and projection image correction method based on optical machine camera calibration | |
| KR100571175B1 (en) | Image processing system, projector, information storage medium and image processing method | |
| CN112954285B (en) | Display method of projection picture and laser projection equipment | |
| JP3879858B2 (en) | Image processing system, projector, and image processing method | |
| CN112616046B (en) | Laser projection device and prompting method thereof | |
| CN113301317B (en) | Display method of projection picture and laser projection equipment | |
| WO2022242306A1 (en) | Laser projection system, image correction method, and laser projection device | |
| US20230127139A1 (en) | Control method, projection apparatus, and control program | |
| CN113259637B (en) | Projection image correction method and laser projection system | |
| US11735078B2 (en) | Control device, control method, control program, and control system | |
| US20200077059A1 (en) | Display apparatus, display system, and method for controlling display apparatus | |
| US10679416B1 (en) | Crosstalk mitigation for virtual reality | |
| JP2005091665A (en) | Projector and obstacle detecting method | |
| CN114928728A (en) | Projection apparatus and foreign matter detection method | |
| WO2022132124A1 (en) | Variable brightness and field of view display | |
| CN114979599B (en) | Laser projection apparatus and correction method of projection image | |
| US20220164928A1 (en) | Image processing apparatus, image processing method, and program | |
| CN109525827B (en) | Image processing method, device and equipment | |
| TWI695625B (en) | Image calibration method and projector system | |
| US20210191532A1 (en) | Method for controlling display device, and display device | |
| CN114765680A (en) | Projected image correction method and laser projection equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |