CN110769220A - Focusing method and focusing device of projection equipment - Google Patents
Focusing method and focusing device of projection equipment Download PDFInfo
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- CN110769220A CN110769220A CN201811325188.1A CN201811325188A CN110769220A CN 110769220 A CN110769220 A CN 110769220A CN 201811325188 A CN201811325188 A CN 201811325188A CN 110769220 A CN110769220 A CN 110769220A
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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
- H04N9/317—Convergence or focusing systems
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Abstract
The embodiment of the invention relates to the technical field of machine vision, and particularly discloses a focusing method and a focusing device of projection equipment. The focusing method comprises the following steps: projecting a marker map to a projection picture, wherein marker areas are respectively superposed on four corners of the projection picture by the marker map; the driving motor rotates for a stroke in a stepping mode, and a projection picture image after each step of rotation of the motor is collected; screening the projection picture image with the highest definition, and calculating the position of a motor corresponding to the projection picture image with the highest definition; the motor is driven to rotate to the motor position, focusing is completed, the problem that peripheral virtual focus occurs in the existing focusing method is solved, meanwhile, the focusing method does not affect the main effect of a projection picture, and customer experience is improved.
Description
Technical Field
The invention relates to the technical field of machine vision, in particular to a focusing method and a focusing device of projection equipment.
Background
The focusing method of the existing projection equipment selects a projection picture central point as a reference area, the reference area has different sizes and different shapes, the periphery of a picture is virtual burnt due to the fact that the focusing area is too small, the whole picture is covered due to the fact that the focusing area is too large, and user experience is influenced, and therefore a scheme which can solve the problem that the periphery of the picture is virtual burnt due to the existing projection equipment focusing method and can improve the user experience is urgently needed to be provided.
Disclosure of Invention
In view of the above, the present application provides a focusing method and a focusing apparatus for a projection apparatus, which solve or at least partially solve the above existing problems.
In order to solve the above technical problem, the technical solution provided by the present invention is a focusing method for a projection apparatus, the method including:
projecting a marker map to a projection picture, wherein marker areas are respectively superposed on four corners of the projection picture by the marker map;
the driving motor rotates for a stroke in a stepping mode, and a projection picture image after each step of rotation of the motor is collected;
screening the projection picture image with the highest definition, and calculating the position of a motor corresponding to the projection picture image with the highest definition;
and driving the motor to rotate to the motor position to finish focusing.
Preferably, the method for screening the projection picture image with the highest definition and calculating the position of the motor corresponding to the projection picture image with the highest definition includes:
dividing each projection picture image into a preset number of image blocks, and calculating the definition value of each image block in each projection picture image;
analyzing the definition change trend of image blocks at the same position in each projection image in one stroke of the motor, and screening out position image blocks which accord with the unimodal trend;
and calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
Preferably, the method for calculating the sharpness of each image block in each projection picture image comprises: and calculating the definition of each image block in each projection image by adopting a contrast focusing algorithm.
Preferably, the method for analyzing the trend of the change of the definition of the image blocks at the same position in each projection picture image in one process of the motor is completed, and screening out the image blocks at the positions meeting the single-peak trend comprises the following steps: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
Preferably, the method for superimposing a marker region on each of the four corners of the projection screen by the marker map includes: the two mark areas located at the diagonal positions of the projection picture are symmetrical relative to the center point of the projection picture.
The present invention also provides a focusing apparatus of a projection device, the apparatus comprising:
the projection marking module is used for projecting a marking image to a projection picture, and marking areas are respectively superposed on the marking image at four corners of the projection picture;
the driving acquisition module is used for driving the motor to rotate for a stroke in a stepping mode and acquiring a projection picture image after each step of rotation of the motor;
the screening calculation module is used for screening the projection picture image with the highest definition and calculating the position of the motor corresponding to the projection picture image with the highest definition;
and the driving focusing module is used for driving the motor to rotate to the motor position to finish focusing.
Preferably, the screening calculation module includes:
the definition value calculation unit is used for dividing each projection picture image into a preset number of image blocks and calculating the definition value of each image block in each projection picture image;
the position image block screening unit is used for analyzing the definition change trend of the image block at the same position in each projection image in one stroke of the motor, and screening the position image block which accords with the single-peak trend;
and the motor position screening unit is used for calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
Preferably, the definition value calculating unit calculates the definition of each image block in each projection image by using a contrast focusing algorithm.
Preferably, the method for screening out the position image blocks meeting the unimodal trend by the position image block screening unit analyzing the definition change trend of the image blocks at the same position in each projection image in one stroke of the motor comprises the following steps: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
Preferably, the method for projecting a marker map onto a projection screen, where the marker map overlaps marker areas at four corners of the projection screen, includes: the two mark areas located at the diagonal positions of the projection picture are symmetrical relative to the center point of the projection picture.
Compared with the prior art, the beneficial effects of the method are detailed as follows: the method comprises the steps of projecting a marker graph to a projection picture, wherein marker areas are respectively superposed on four corners of the projection picture by the marker graph; the driving motor rotates for a stroke in a stepping mode, and a projection picture image after each step of rotation of the motor is collected; screening the projection picture image with the highest definition, and calculating the position of a motor corresponding to the projection picture image with the highest definition; the motor is driven to rotate to the motor position, the focusing method is completed, the problem that peripheral virtual focus occurs in the existing focusing method is solved, meanwhile, the focusing mode does not affect the main effect of the projection picture, and the customer experience is improved.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic flowchart of a focusing method of a projection apparatus according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a projection image provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a focusing device of a projection apparatus according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, embodiment 1 of the present invention provides a focusing method for a projection apparatus, where the method includes:
s11: projecting a marker graph to the projection picture, wherein the marker graph is respectively superposed with marker areas at four corners of the projection picture;
s12: the driving motor rotates for a stroke in a stepping mode, and a projection picture image after each step of rotation of the motor is collected;
s13: screening the projection picture image with the highest definition, and calculating the position of a motor corresponding to the projection picture image with the highest definition;
s14: and driving the motor to rotate to the motor position to finish focusing.
Specifically, in step S11, the label map may be formed by transparently superimposing the same label area or different label areas on the four corners of the projection screen. Here, 4 arbitrary mark areas are projected at four corners of the projection picture, the mark areas can be any content and any pattern, the same set of algorithm can be compatible with the arbitrary mark areas, different algorithms do not need to be matched according to the mark areas, an interactive mark can be selectively added in other areas of the projection picture besides the surrounding mark areas, the interactive mark can consider the coordination of product functions and other functions, the addition and non-addition can be selected, the focusing picture can have better friendliness due to the addition of the interactive mark, and company information can be prompted.
Preferably, the marked area has a strong contrast, and the marked area has a size of 0.04 or more of the whole projection area. The signature can be a png pattern that is projected directly to create the superposition effect. Wherein the marking area can be adjusted according to overall interactivity and aesthetic design. According to the virtual focus characteristic of the optical machine, the mark area is superposed in the specific area, so that the special optical machine can be ensured to be processed.
Specifically, in step S12, the driving motor rotates from left to right, and sends a command to the camera module to capture a projection image every 1 rotation, where the captured projection image is as shown in fig. 2, and after the rotation from left to right is finished, the motor completes a stroke, and the camera module captures a plurality of projection images.
Specifically, the method for screening the projection picture image with the highest definition and calculating the position of the motor corresponding to the projection picture image with the highest definition in step S13 includes:
s131: dividing each projection picture image into a preset number of image blocks, and calculating the definition value of each image block in each projection picture image;
s132: analyzing the definition change trend of image blocks at the same position in each projection image in one stroke of the motor, and screening out position image blocks which accord with the unimodal trend;
s133: and calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
Specifically, the method for calculating the sharpness of each image block in each projection picture image in step S131 includes: and calculating the definition of each image block in each projection image by adopting a contrast focusing algorithm.
Here, each captured projection image may be partitioned, the size of each image block may be determined by debugging as needed, and an excessive number of image blocks may reduce the area of the image block, which may cause a large noise effect.
Specifically, the method for analyzing the sharpness variation trend of the image blocks at the same position in each projection image in one motor stroke in step 132 and screening out the image blocks at the positions meeting the single-peak trend includes: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
The divided image blocks are divided into a non-mark area and a mark area, the change trend of the image block definition of the mark area conforms to the unimodal characteristic, the definition value is increased and then decreased, the image block of the mark area can reach a definition peak value near a certain focal length position, the change of the image block definition of the non-mark area is irregular, and the change of the image block definition of the non-mark area can be changed along with the change of the content of a projection picture. The method for screening the image blocks with the single-peak trend aims at that one image block continuously obtains definition values from projection image images with different focal lengths, the definition maximum value is updated, and the situation that the definition values are continuously reduced can occur after the definition maximum value is updated, so that the image blocks with the single-peak trend are found, each image block with the single-peak trend only has 1 definition peak value, a plurality of definition peak values exist in the image blocks with the single-peak trend, the motor position corresponding to the most definition peak value is found in the plurality of definition peak values, and the motor is driven to reach the position, so that the focusing of the projection equipment is completed.
The method comprises the steps of analyzing each projection picture with different focal lengths, calculating a definition value to obtain a projection picture local area which is most suitable for definition judgment, and finding a motor position with the highest definition according to the definition of the local area for focusing, wherein 4 mark areas can be the same mark area and are respectively placed at 4 corners of the projection picture, 2 mark areas at opposite angles are symmetrical relative to the central point of the projection picture, and in order to achieve better focusing effect, more mark areas can be adopted to achieve the effect of global focusing.
As shown in fig. 3, embodiment 2 of the present invention further provides a focusing device for a projection apparatus, where the focusing device includes:
a projection mark module 21, configured to project a mark map to the projection screen, where the mark map overlaps mark areas at four corners of the projection screen;
the driving acquisition module 22 is used for driving the motor to rotate by a stroke in a stepping mode and acquiring a projection picture image after each step of rotation of the motor;
the screening calculation module 23 is configured to screen a projection image with the highest definition, and calculate a motor position corresponding to the projection image with the highest definition;
and the driving focusing module 24 is used for driving the motor to rotate to the motor position to complete focusing.
Specifically, the projection marking module 21 is further configured to project a marking map to the projection screen, where the marking map overlaps marking regions at four corners of the projection screen, and the method includes: the two marker areas located at diagonal positions of the projection screen are point-symmetric with respect to the center of the projection screen.
Specifically, the screening calculation module 23 includes:
the definition value calculation unit is used for dividing each projection picture image into a preset number of image blocks and calculating the definition value of each image block in each projection picture image;
the position image block screening unit is used for analyzing the definition change trend of the image block at the same position in each projection image in one stroke of the motor, and screening the position image block which accords with the single-peak trend;
and the motor position screening unit is used for calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
Specifically, the definition value calculation unit calculates the definition of each image block in each projection image by using a contrast focusing algorithm.
Specifically, the method for screening the position image blocks meeting the unimodal trend by the position image block screening unit by analyzing the definition change trend of the image blocks at the same position in each projection image in one stroke of the motor comprises the following steps: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
The description of the features in the embodiment corresponding to fig. 3 may refer to the related description of the embodiment corresponding to fig. 1, and is not repeated here.
The above description describes in detail a focusing method and a focusing apparatus for a projection device according to an embodiment of the present invention. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Claims (10)
1. A focusing method for a projection apparatus, the method comprising:
projecting a marker map to a projection picture, wherein marker areas are respectively superposed on four corners of the projection picture by the marker map;
the driving motor rotates for a stroke in a stepping mode, and a projection picture image after each step of rotation of the motor is collected;
screening the projection picture image with the highest definition, and calculating the position of a motor corresponding to the projection picture image with the highest definition;
and driving the motor to rotate to the motor position to finish focusing.
2. The focusing method of a projection apparatus according to claim 1, wherein the method for screening the projection picture image with the highest resolution and calculating the motor position corresponding to the projection picture image with the highest resolution comprises:
dividing each projection picture image into a preset number of image blocks, and calculating the definition value of each image block in each projection picture image;
analyzing the definition change trend of image blocks at the same position in each projection image in one stroke of the motor, and screening out position image blocks which accord with the unimodal trend;
and calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
3. The focusing method of a projection apparatus according to claim 2, wherein the method for calculating the sharpness of each image block in each projection picture image comprises: and calculating the definition of each image block in each projection image by adopting a contrast focusing algorithm.
4. The focusing method of a projection apparatus according to claim 2, wherein the method for analyzing the trend of the sharpness change of the image blocks at the same position in each projection image in one motor stroke and screening out the image blocks at the positions meeting the single-peak trend comprises: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
5. The focusing method of a projection apparatus according to claim 1, wherein the method for superimposing the mark regions on the mark map at four corners of the projection screen comprises: the two mark areas located at the diagonal positions of the projection picture are symmetrical relative to the center point of the projection picture.
6. A focusing device for a projection apparatus, the device comprising:
the projection marking module is used for projecting a marking image to a projection picture, and marking areas are respectively superposed on the marking image at four corners of the projection picture;
the driving acquisition module is used for driving the motor to rotate for a stroke in a stepping mode and acquiring a projection picture image after each step of rotation of the motor;
the screening calculation module is used for screening the projection picture image with the highest definition and calculating the position of the motor corresponding to the projection picture image with the highest definition;
and the driving focusing module is used for driving the motor to rotate to the motor position to finish focusing.
7. The focusing device of the projection apparatus as claimed in claim 6, wherein the filtering calculation module comprises:
the definition value calculation unit is used for dividing each projection picture image into a preset number of image blocks and calculating the definition value of each image block in each projection picture image;
the position image block screening unit is used for analyzing the definition change trend of the image block at the same position in each projection image in one stroke of the motor, and screening the position image block which accords with the single-peak trend;
and the motor position screening unit is used for calculating the motor position with the maximum number of times of the occurrence of the definition peak according to the corresponding motor position when the definition peak occurs in the screened position image block, namely determining the motor position corresponding to the projection image with the highest definition.
8. The focusing apparatus of a projection device as claimed in claim 7, wherein the sharpness value calculating unit calculates the sharpness of each image block in each projection picture image by using a contrast focusing algorithm.
9. The focusing device of a projection apparatus as claimed in claim 7, wherein the position image block selecting unit analyzes a trend of a change in a resolution of an image block at a same position in each projection image in a motor completing a stroke, and selects a position image block which satisfies a single-peak trend, comprising: and sequentially acquiring the definition values of the image blocks at the same position in each projection image, wherein when the definition values of the image blocks at the same position are continuously increased to the maximum value and then are continuously reduced, namely the image blocks are position image blocks which accord with a single-peak trend.
10. The focusing device of the projection apparatus as claimed in claim 6, wherein the projection mark module is further configured to project a mark pattern onto the projection screen, and the mark pattern overlaps mark regions at four corners of the projection screen, respectively, and includes: the two mark areas located at the diagonal positions of the projection picture are symmetrical relative to the center point of the projection picture.
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| CN201811325188.1A CN110769220B (en) | 2018-11-08 | 2018-11-08 | Focusing method and focusing device of projection equipment |
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| CN201811325188.1A CN110769220B (en) | 2018-11-08 | 2018-11-08 | Focusing method and focusing device of projection equipment |
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