CN114286067A

CN114286067A - Projection equipment and image correction method

Info

Publication number: CN114286067A
Application number: CN202111627244.9A
Authority: CN
Inventors: 矫风
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-04-05

Abstract

The embodiment of the application provides a projection device and an image correction method, relates to the technical field of projection, and can perform image correction on a to-be-projected image of the projection device so as to improve the problem of chromatic aberration when the projected image is projected onto a projection screen and improve the viewing experience of a user. The projection device includes: the projection assembly is used for projecting an image to be projected onto a projection screen; wherein the projection assembly comprises a light source for outputting light of N primary colors, N being an integer greater than 1; a controller configured to: acquiring chromatic aberration correction information; correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto a projection screen through a projection assembly.

Description

Projection equipment and image correction method

Technical Field

The present application relates to the field of projection technologies, and in particular, to a projection apparatus and an image correction method.

Background

With the development of electronic technology, projection equipment is more and more widely applied, and the main working scenes of the projection equipment are teaching, demonstration, entertainment, work and the like. In the projection process of the projection device, the projection device firstly irradiates light rays onto the image display element to generate an image, and then projects the generated image onto the projection screen through the projection lens.

The image display element of the projector can divide the light of the projection lamp into three colors of red, green and blue, and images projected by the three colors of red, green and blue are overlapped to generate projection images with various colors. However, since the light beams of the three colors of red, green and blue have different wavelengths and refractive indexes, the projected light beams composed of the light beams of the three colors of red, green and blue may not completely overlap after passing through the same optical lens (i.e., projection lens). As such, the image displayed on the projection screen may be dispersed according to color separation, i.e., an "image dispersion" phenomenon. As shown in fig. 1, the projection screen may exhibit an image with unclear edges, which is also referred to as "fringing" of the image edges, as perceived by the human eye.

Disclosure of Invention

The embodiment of the application provides a projection device and an image correction method, which can perform image correction on a to-be-projected image of the projection device so as to improve the problem of chromatic aberration when the projected image is projected onto a projection screen and improve the viewing experience of a user.

In a first aspect, an embodiment of the present application provides a projection apparatus, including:

the projection assembly is used for projecting an image to be projected onto a projection screen; wherein the projection assembly comprises a light source for outputting light of N primary colors, N being an integer greater than 1;

a controller configured to: acquiring chromatic aberration correction information; correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto a projection screen through a projection assembly.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: before the projection device projects the image to be projected, the projection device may perform image correction on the image to be projected by using each base color sub-pixel block of the pixel block as a correction unit based on the acquired color difference correction information. Therefore, the projection assembly projects the corrected image to be projected, so that the phenomenon of image chromatic aberration of the projected image displayed on the projection screen can be avoided, and the projection equipment can provide a better visual effect for a user.

In some embodiments, the controller is further configured to: in response to the correction instruction, projecting the correction chart onto a projection screen; and acquiring chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

In some embodiments, the correction card comprises a plurality of pixel blocks, a pixel block being made up of N base color sub-pixel blocks; the color difference correction information comprises correction information for correcting each pixel block in the image card, and the correction information of the pixel block is determined according to the relative position relation of each primary color sub-pixel block in the pixel block on the projection screen.

In some embodiments, the correction information of the pixel block includes first distance information indicating a distance in a horizontal direction between a first color sub-pixel block and a second color sub-pixel block in the pixel block on the projection screen, and second distance information indicating a distance in a vertical direction between the first color sub-pixel block and the second color sub-pixel block in the pixel block on the projection screen, the first color sub-pixel block being any one of the pixel blocks, the second color sub-pixel block being the other one of the pixel blocks except for the first color sub-pixel block.

In some embodiments, the primary colors include red, green, and blue.

In some embodiments, the controller is configured to: for each pixel block in the image to be projected, determining correction information matched with the pixel block of the image to be projected from the color difference correction information; and correcting the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

In some embodiments, the controller is configured to: taking the original coordinates of a first primary color sub-pixel block in a pixel block of the image to be projected as the correction coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected; and modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

In some embodiments, the controller is configured to: according to the first distance information, modifying the original horizontal coordinate of a second primary color sub-pixel block in the pixel block of the image to be projected to obtain a modified horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected; and according to the second distance information, modifying the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected to obtain the modified vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected.

In a second aspect, there is provided a projection system comprising: a projection screen and any one of the projection devices provided in the first aspect above.

In a third aspect, an embodiment of the present application provides an image correction method, including: acquiring chromatic aberration correction information; correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto a projection screen through a projection assembly.

In some embodiments, obtaining chromatic aberration correction information comprises: in response to the correction instruction, projecting the correction chart onto a projection screen; and acquiring chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

In some embodiments, the primary colors include red, green, and blue.

In some embodiments, modifying the original coordinates of the N base color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain modified coordinates of the N base color sub-pixel blocks of each pixel block in the image to be projected includes: for each pixel block in the image to be projected, determining correction information matched with the pixel block of the image to be projected from the color difference correction information; and correcting the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

In some embodiments, modifying the original coordinates of each base color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the modified coordinates of each base color sub-pixel block of the image to be projected includes: taking the original coordinates of a first primary color sub-pixel block in a pixel block of the image to be projected as the correction coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected; and modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

In some embodiments, modifying original coordinates of a second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected includes: according to the first distance information, modifying the original horizontal coordinate of a second primary color sub-pixel block in the pixel block of the image to be projected to obtain a modified horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected; and according to the second distance information, modifying the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected to obtain the modified vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected.

In a fourth aspect, an embodiment of the present application provides an image correction apparatus, which includes a transceiver unit and a processing unit. A transceiving unit for acquiring color difference correction information; the processing unit is used for correcting the original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information so as to obtain the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and the processing unit is also used for projecting the image to be projected onto the projection screen through the projection assembly according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected.

In some embodiments, the processing unit is specifically configured to: in response to the correction instruction, projecting the correction chart onto a projection screen; and acquiring chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

In some embodiments, the primary colors include red, green, and blue.

In some embodiments, for each pixel block in the image to be projected, the processing unit is specifically configured to: determining correction information matched with a pixel block of an image to be projected from the color difference correction information; and correcting the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

In some embodiments, the processing unit is specifically configured to: taking the original coordinates of a first primary color sub-pixel block in a pixel block of the image to be projected as the correction coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected; and modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

In some embodiments, the processing unit is specifically configured to: according to the first distance information, modifying the original horizontal coordinate of a second primary color sub-pixel block in the pixel block of the image to be projected to obtain a modified horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected; and according to the second distance information, modifying the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected to obtain the modified vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected.

In a fifth aspect, an embodiment of the present application provides an image correction apparatus, including: one or more processors and memory; wherein the memory has stored therein one or more computer programs, the one or more computer programs comprising instructions, which when executed by the image correction apparatus, cause the image correction apparatus to perform the method provided by the third aspect described above.

In a sixth aspect, embodiments of the present application provide a computer-readable storage medium, which includes computer instructions that, when executed on a computer, cause the computer to perform the method provided in the third aspect.

In a seventh aspect, an embodiment of the present invention provides a computer program product including computer instructions, which, when run on a computer, cause the computer to perform the method provided in the third aspect.

The technical effects brought by any one of the possible schemes in the second aspect to the seventh aspect may be analyzed in the beneficial effects corresponding to the first aspect, and are not described herein again.

Drawings

FIG. 1 is a schematic illustration of a projected image with image dispersion problems;

FIG. 2 is a schematic view of a projection system according to an embodiment of the present disclosure;

fig. 3 is a schematic composition diagram of a projection apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating a projection module according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another projection apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of an image correction method according to an embodiment of the present disclosure;

FIG. 7 is a schematic flowchart of another image correction method according to an embodiment of the present disclosure;

FIG. 8 is a schematic flowchart of another image correction method according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a calibration chart according to an embodiment of the present application;

fig. 10 is a schematic diagram of a projection image in a projection fusion scene according to an embodiment of the present application;

fig. 11 is a schematic composition diagram of an image correction apparatus according to an embodiment of the present disclosure;

fig. 12 is a schematic diagram of a hardware structure of an image correction apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. In addition, when a pipeline is described, the terms "connected" and "connected" are used in this application to have a meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

As described in the background art, the refractive indexes of the projection beams composed of red, green and blue lights passing through the same projection lens are different, and as shown in fig. 1, the "image chromatic aberration" phenomenon may occur in the projection image displayed on the projection screen.

In view of the above technical problem, the present application provides a projection apparatus, including: the projection assembly is used for projecting an image to be projected onto a projection screen; wherein the projection assembly comprises a light source for outputting light of N primary colors, N being an integer greater than 1; a controller configured to: acquiring chromatic aberration correction information; correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto a projection screen through a projection assembly.

In this way, before the projection device projects the image to be projected, the projection device may perform image correction on the image to be projected by using each of the primary color sub-pixel blocks of the pixel block as a correction unit based on the acquired color difference correction information. Therefore, the projection assembly projects the corrected image to be projected, so that the phenomenon of image chromatic aberration of the projected image displayed on the projection screen can be avoided, and the projection equipment can provide a better visual effect for a user.

Fig. 2 is a schematic view of a projection system according to an embodiment of the present disclosure. As shown in fig. 2, the projection system includes a projection device 100 and a projection screen 200.

As shown in fig. 2, the light outlet of the projection device 100 faces the projection screen, and the projection device 100 may emit a light beam to the projection screen 200, and the projection screen 200 is used for reflecting the light beam to realize the display of the picture.

Among them, the projection apparatus 100 may refer to an apparatus having a projection function. As an example, it may be a desktop projector, a portable projector, a floor-type projector, a reflective projector, a transmissive projector, a single-function projector, a multi-function projector, an intelligent projector, or a touch interactive projector, etc. Of course, projection device 100 may also have other names, such as projection host, projector, etc.

Alternatively, the projection apparatus 100 may be a rectangular parallelepiped, a prism, a sphere, a desk lamp, and the like, and the embodiment of the present application is not limited as long as the projection apparatus has a projection function.

Optionally, the projection apparatus 100 may be a projection apparatus with a set of projection lenses, or may also be a projection apparatus with a plurality of sets of projection lenses, where the images projected by the plurality of sets of projection lenses are overlapped in edge, and can be displayed as a complete projection image through a fusion technique.

Fig. 3 is a schematic structural diagram of a projection apparatus 100 according to an embodiment of the present application, and the projection apparatus 100 is described with reference to fig. 2 and fig. 3. The projection apparatus 100 includes: projection assembly 110, controller 120. The projection assembly 110 is connected to a controller 120. It should be understood that fig. 2 only shows some of the components of projection device 100, and that other components of projection device 100 not shown may also be present.

The projection assembly 110 is used for projecting an image to be projected onto a projection screen.

The controller 120 is configured to: acquiring chromatic aberration correction information; correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected; and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto a projection screen through a projection assembly.

Optionally, as shown in fig. 4, the projection assembly 110 may include a light source 111, a projection lens 112, and an optical engine 113. The light source 111 is configured to output light of N primary colors, where N is an integer greater than 1.

In practical use, the light source 111 may output light beams of N primary colors to the light engine 113, and the light engine 113 further modulates the light beams of N primary colors according to the image to be projected, so as to obtain the light beam to be projected. Further, the projection lens 112 may project the projection light beam from the light outlet to form a projection picture on the projection screen 200.

In some examples, the light source 111 may be a monochromatic light source, which may include a blue laser. In this case, the light source 111 may further include a fluorescent wheel and/or a color filter wheel to ensure that the laser beam emitted by the light source 111 may be a red, green and blue light beam. However, the light source 111 may not include at least one of the fluorescent wheel or the color filter wheel, but the fluorescent wheel and/or the color filter wheel may be included in an optical engine of the projection device in order to ensure a projection effect of the projection device. The fluorescence wheel can be excited to fluoresce.

In other examples, light source 111 is a multi-color light source. For example, the multicolor light source includes a three-color laser chip or three sets of monochromatic lasers integrated in one package unit. Illustratively, the three sets of monochromatic lasers may include a set of green lasers, a set of red lasers, and a set of blue lasers. Each set of lasers may include one or more lasers. In this way, the light source 111 can be made to directly emit light beams of three colors of red, green, and blue.

Alternatively, the light source 111 may be other types of light sources other than a laser.

Illustratively, the projection lens 112 is used to project an image to be projected. The projection lens 112 may be a zoom lens, a fixed focus variable lens, or a fixed focus lens. So that projection device 100 may be an ultra-short focus projection device, a short focus projection device, or a long focus projection device. For example, when the projection apparatus 100 is an ultra-short-focus projection apparatus, the projection lens 112 is an ultra-short-focus projection lens, and the projection ratio of the projection lens 112 is usually less than 0.3, such as 0.24.

Illustratively, the optical engine 113 may be configured to modulate the light beams of different colors according to the current image display signal to obtain the projection light beams. The optical engine 113 may be an optical engine based on a Digital Light Processing (DLP) or Liquid Crystal Display (LCD) projection technology.

Optionally, as shown in fig. 5, the projection apparatus 100 may further include: an image acquisition unit 130, a communication unit 140, an interface unit 150, a memory 160, and other units. These components may communicate over one or more communication buses or signal lines (not shown in fig. 5).

In some embodiments, the image acquisition unit 130 is configured to acquire an image. Optionally, during the projection process, the image capturing unit 130 is also oriented toward the projection screen 200, and may be used to capture the projection image displayed by the projection screen 200.

Illustratively, the image capturing unit 130 may be an image sensor, or an imaging device with an image sensor such as a camera or the like. For example, the image sensor may be a photosensitive device such as a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor.

A communication unit 140 for communicating with other network entities. The communication unit 140 may include a Radio Frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, a GPS module, and the like. Taking the RF module as an example, the RF module can be used for receiving and transmitting signals, and particularly, transmitting the received information to the controller 120 for processing; in addition, the signal generated by the controller 120 is transmitted. In general, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like.

For example, the projection device may interact with other devices through the communication unit 140, such as receiving a to-be-projected picture sent by other terminals or base stations. At this time, the communication unit 140 may be used for connection between the projection device and other terminals or base stations to implement reception and transmission of signals, and may hand the received data to the controller 120 for processing.

An interface unit 150 for providing various interfaces for external input/output devices (e.g., a keyboard, a mouse, an external display, an external memory, a sim card, etc.). For example, the terminal is connected to a mouse or a display through a Universal Serial Bus (USB) interface, connected to a Subscriber Identity Module (SIM) card provided by a telecommunications carrier through a metal contact on a card slot of the SIM card, and configured to implement a Communication function with other terminals through an interface of the Wi-Fi unit 140, an interface of a Near Field Communication (NFC) device, an interface of a bluetooth Module, and the like.

Memory 160 may be used to store software programs and data. The controller 120 performs various functions of the projection apparatus 100 and data processing by executing software programs or data stored in the memory 160. The memory 160 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Memory 160 stores an operating system that enables projection device 100 to operate. The memory 160 may store an operating system and various application programs, and may also store codes for executing the projection control method of the projection apparatus provided in the embodiments of the present application.

Optionally, the projection device 100 may further include an audio circuit, a speaker, a microphone, bluetooth, a Near Field Communication (NFC) device, and the like, which are not described herein again.

Those skilled in the art will appreciate that the hardware configuration shown in fig. 5 does not constitute a limitation of the projection device, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 6, an embodiment of the present application provides an image correction method, including the following steps:

s101, the controller acquires color difference correction information.

The chromatic aberration correction information is used for carrying out image correction on an image to be projected of the projection equipment.

Optionally, for each image to be projected of the projection apparatus, the controller may perform mesh segmentation on the image to be projected in the form of X rows by Y columns, so as to obtain X × Y pixel blocks. For example, the controller may divide the image to be projected into 1984 blocks of pixels in 32 rows by 62 columns.

In the case where the image to be projected includes X × Y pixel blocks, the above-described color difference correction information may include correction information that matches each of the X × Y pixel blocks.

It should be understood that, in general, projection devices need to output lights with different primary colors to realize projection of images to be projected, which may cause an image color difference phenomenon of the projected images displayed on the projection screen. Therefore, in order to enable the projection apparatus to provide a better visual effect for a user, the controller needs to acquire the chromatic aberration correction information, and then perform image correction on the image to be projected according to the acquired chromatic aberration correction information.

Alternatively, the controller may retrieve the color difference correction information from a memory of the projection device.

The color difference correction information may be preset when the projection apparatus leaves a factory, or may be newly determined by the projection apparatus based on a current situation before the projection apparatus performs projection each time, and stored in a memory of the projection apparatus. Thus, before the projection device performs projection, the controller may call the color difference correction information from the memory of the projection device to perform image correction on the image to be projected.

S102, the controller corrects the original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected.

For example, in the case where the controller divides the image to be projected into X × Y pixel blocks, each pixel block has a specific position and color pattern, and the X × Y pixel blocks having the color pattern are arranged according to the positions thereof, so that the image to be projected can be presented.

For each pixel block in the image to be projected, one pixel block comprises N primary color sub-pixel blocks, and N is an integer greater than 1. Thus, the combination of the N primary color sub-pixel blocks of a pixel block can present the color pattern of the pixel block.

In some embodiments, the primary colors of a pixel block may include red, green, and blue.

It should be noted that, the three primary colors of red, green and blue can be modulated into various colors according to different proportions, and most colors in nature can be obtained by mixing the three primary colors of red, green and blue according to a certain proportion. And any color (except the three primary colors of red, green and blue) can be decomposed into the three primary colors of red, green and blue.

In some embodiments, the location of one pixel block may be represented by a two-dimensional coordinate.

Illustratively, the position coordinates of one pixel block may be expressed as (X)_i，Y_i). Wherein, X_iAnd Y_iCan be determined according to the following formula (1) and formula (2).

Wherein, X_iRepresenting the horizontal coordinates of the block of pixels; DMDWidth represents the horizontal pixel value of the image to be projected; CloumnNumber indicates the row of the pixel block.

Wherein, Y_iA vertical coordinate representing the block of pixels; DMDHeight represents the vertical pixel values of the image to be projected; RowNumber indicates the column in which the pixel block is located.

For example, in the case where the resolution of the image to be projected is 3840 × 2160, if the controller divides the correction card into 1984 pixel blocks of 32 rows × 62 columns. For a pixel block in row 0, column 1, the coordinates of the pixel block may be expressed as (0,63) according to the above formula (1) and formula (2).

It should be understood that the coordinates of the pixel block obtained according to the above formula (1) and formula (2) are the original coordinates of the pixel block, i.e. the original coordinates of the N base color sub-pixel blocks of the pixel block.

Further, the controller may obtain the correction coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information and the original coordinates of the N primary color sub-pixel blocks of each pixel block.

S103, the controller projects the image to be projected onto a projection screen through the projection assembly according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected.

In some embodiments, based on the embodiment shown in fig. 6, as shown in fig. 7, the step S102 may be specifically implemented as:

and S1021, for each pixel block in the image to be projected, the controller determines correction information matched with the pixel block in the image to be projected from the color difference correction information.

Alternatively, the controller may determine the correction information matched with each pixel block of the image to be projected according to the position of the pixel block in the image to be projected.

It should be understood that, for each image to be projected by the projection device, the number of pixel blocks included in each image to be projected may be the same.

For example, the color difference correction information acquired by the controller may be as shown in table 1 or table 2. The color difference correction information may include correction information matched with each pixel block, and the correction information has a corresponding relationship with a position of the pixel block on the image to be projected.

TABLE 1

Pixel block	Line of	Column(s) of	Chromatic aberration correction information
				Pixel block 1	0	0	Correction information 1
Pixel block 2	0	63	Correction information 2
				Pixel block i	i	i	Correction information i

TABLE 2

Pixel block	Initial coordinates	Chromatic aberration correction information
			Pixel block 1	(0,0)	Correction information 1
Pixel block 2	(0,63)	Correction information 2
			Pixel block i	(X_i，Y_i)	Correction information i

And S1022, the controller corrects the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected, so as to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

Wherein, since a pixel block may comprise N base color sub-pixel blocks, the original coordinates of the N base color sub-pixel blocks of the pixel block should be the same as the original coordinates of the pixel block.

It should be noted that, for each pixel block in the image to be projected, one pixel block may include N primary color sub-pixel blocks. Since the light beams with different colors have different refractive indexes when passing through the same projection lens, the relative position relationship of each primary color sub-pixel block in one pixel block after projection may be changed, which may cause the color pattern presented by the pixel block after projection to deviate from the color pattern presented by the pixel block before projection, thereby causing the phenomenon of "image color difference".

Therefore, the original coordinates of each primary color sub-pixel block of the pixel block can be corrected, and the relative position relation between each primary color sub-pixel block before projection of the pixel block is changed, so that the color pattern presented after projection of the pixel block is the same as that presented before projection of the pixel block.

As a possible implementation manner, the controller uses the original coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected as the modified coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected. And modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

Optionally, the first base color sub-pixel block is any one of the base color sub-pixel blocks, and the second base color sub-pixel block is the other base color sub-pixel blocks except the first base color sub-pixel block.

Illustratively, if the first base color sub-pixel block is a green sub-pixel block, the second base color sub-pixel block includes a red sub-pixel block and a blue sub-pixel block.

It will be appreciated that in order to ensure that the color pattern exhibited by the pixel block after projection is the same as the color pattern exhibited by the pixel block before projection, the relative positional relationship between the individual base color sub-pixel blocks of the pixel block before projection may be altered. Therefore, the controller may use any one of the primary sub-pixel blocks of the pixel block as a reference pixel block (i.e., a first primary sub-pixel block), and further adjust the original coordinates of each of the other pixel blocks (i.e., a second primary sub-pixel block) to perform modification, so as to adjust the relative position relationship between each of the other pixel blocks and the reference pixel block.

Alternatively, the correction information of one pixel block may include first distance information and second distance information. The first distance information includes a horizontal correction distance of the second-color sub-pixel block from the first-color sub-pixel block for correcting a horizontal coordinate of the second-color sub-pixel block. The second distance information includes a vertical correction distance between the second base color sub-pixel block and the first base color sub-pixel block, for correcting a vertical coordinate of the second base color sub-pixel block.

Therefore, the controller modifies the original horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected according to the first distance information, and modifies the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected according to the second distance information.

Further, based on the first distance information, the second distance information, and the initial coordinates of the pixel block, the controller may obtain modified horizontal coordinates and modified vertical coordinates of a second base color sub-pixel block in the pixel block of the image to be projected.

Optionally, the modified horizontal coordinate of the second color sub-pixel block may be the horizontal initial coordinate value of the second color sub-pixel block minus the horizontal modification distance between the second color sub-pixel block and the first color sub-pixel block. The corrected vertical coordinate of the second primary color sub-pixel block may be the vertical initial coordinate of the second primary color sub-pixel block minus the vertical correction distance between the second primary color sub-pixel block and the first primary color sub-pixel block

For example, in the case that the primary colors of the pixel blocks of the image to be projected include red, green, and blue, the first distance information of one pixel block may be that the horizontal correction distance of the red sub-pixel block and the green sub-pixel block is 0.2 pixels (pix), and the horizontal correction distance of the blue sub-pixel block and the green sub-pixel block is 0.3 pixels (pix). The second distance information of one pixel block may be that the vertical correction distance of the red sub-pixel block and the green sub-pixel block is 0.4 pixels (pix), and the vertical correction distance of the blue sub-pixel block and the green sub-pixel block is 0.3 pixels (pix).

If the initial coordinates of the pixel block are (0,63), the controller may determine the corrected coordinates of the red subpixel block to be (-0.2,62.6) and the corrected coordinates of the blue subpixel block to be (-0.3, 62.7).

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: the coordinates of each primary color sub-pixel block in the pixel block are corrected, so that in the projection process, the light rays corresponding to each primary color sub-pixel block are projected from different positions on the lens, and finally, the lens has different refractive indexes for different light rays, so that the light rays corresponding to each primary color sub-pixel block can be projected to the same position on the projection screen, and the chromatic aberration phenomenon is avoided.

In some embodiments, as shown in fig. 8, the image correction method may further include the steps of:

s201, in response to the correction instruction, the controller projects the correction chart onto the projection screen.

The correction instruction is used for instructing the projection equipment to correct the image.

For example, when the user finds that the color difference of the projected image occurs, the user may input an instruction instructing the projection apparatus to perform image correction to a control device (e.g., an electronic device such as a remote controller or a smart phone) matched with the projection apparatus.

For another example, the controller of the projection device may automatically detect the current projection image before the projection device performs projection, and the projection device may receive the correction instruction when the controller determines that the projection image projected by the projection device on the projection screen has a color difference.

Of course, in practical application, the projection device may also obtain the correction instruction in other manners, which is not limited in this application embodiment.

In addition, the correction chart may be as shown in fig. 9, wherein the correction chart may display graphics of different primary colors.

Optionally, the controller may perform mesh division on the calibration chart in a form of X rows × Y columns, so as to obtain X × Y pixel blocks of the calibration chart. For example, the controller may divide the image to be projected into 1984 blocks of pixels in 32 rows by 62 columns.

It should be understood that the controller divides the correction card in the same manner as the controller divides the image to be projected in step S101, so that each pixel block in the correction card has a corresponding relationship with each pixel block of the image to be projected.

Accordingly, one pixel block of the correction card is composed of N primary color sub-pixel blocks. Alternatively, the primary colors of one pixel block of the correction card may include red, green, and blue.

Further, for each pixel block of the correction card, the position coordinates of one pixel block may be expressed as (X)_i，Y_i). In addition X_iAnd Y_iCan be based onThe following formula (1) and formula (2).

S202, the controller obtains chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

Wherein the color difference correction information comprises correction information of each pixel block of the correction chart.

Optionally, for correcting the correction information of each pixel block in the graphic card, the correction information of one pixel block includes first distance information and second distance information.

The first distance information includes a horizontal distance between the second primary color sub-pixel block and the first primary color sub-pixel block on the projection screen, that is, a horizontal correction distance between the second primary color sub-pixel block and the first primary color sub-pixel block of the image to be projected. The second distance information includes a vertical distance between the second primary color sub-pixel block and the first primary color sub-pixel block on the projection screen, that is, a vertical correction distance between the second primary color sub-pixel block and the first primary color sub-pixel block of the image to be projected.

In some embodiments, for each pixel block of the correction card, the controller may determine the correction information for that pixel block in the following manner.

In another implementation manner, the controller may acquire, by the image acquisition device, a display image of the correction chart on the projection screen, and acquire, in the display image, a horizontal distance between the second base color sub-pixel block and the first base color sub-pixel block on the projection screen and a vertical distance between the second base color sub-pixel block and the first base color sub-pixel block on the projection screen.

Wherein, for the calibration chart shown in FIG. 9, pattern 2 is displayed in the first primary color, pattern 1 and pattern 3 are displayed in the first primary color, and pattern 2 is vertically aligned with pattern 1 and pattern 3 is horizontally aligned with pattern 2.

For example, taking pattern 2 and pattern 1 as an example, the relative position relationship between pattern 1 and pattern 2 may be different after the projection due to the different refractive indexes of the different colors passing through the projection lens. Wherein, in the display image on the projection screen, the pattern 2 may not be vertically aligned with the pattern 1, and in this case, the horizontal distance between the second primary color sub-pixel block and the first primary color sub-pixel block on the projection screen may be determined according to the horizontal distance between the pattern 2 and the pattern 1 in the display image on the projection screen.

In another implementation, the controller may receive color difference correction information via the projection device communication interface.

Among them, the related art can manually measure, in a display image of the correction card on the projection screen, a horizontal distance of the second primary color sub-pixel block from the first primary color sub-pixel block on the projection screen and a vertical distance of the second primary color sub-pixel block from the first primary color sub-pixel block on the projection screen by using a pixel measurement card (e.g., a flare card).

Optionally, the controller sequentially obtains the first distance information and the second distance information in each pixel block of the correction card according to the determination mode of the correction information of the pixel block, that is, the correction information of the pixel block.

Alternatively, to reduce the workload of measuring the first distance information and the second distance information, the controller may sample and select at least one pixel block based on the position of each pixel block in the correction card, and sequentially detect the first distance information and the second distance information in the sampled and selected at least one pixel block, that is, the correction information of the pixel block.

Further, the controller may use the mean or other similar value to determine the correction information for the remaining pixel blocks.

For example, with the first row of pixel blocks of the correction card, if the first row of the correction card has 5 pixel blocks, the controller may select three pixel blocks in the first row and the first column, the first row and the third column, and the first row and the fifth column, and sequentially obtain the correction information of the first row and the first column, the first row and the third column, and the first row and the fifth column.

Further, the controller may take an average of the correction information of the pixel blocks of the first row, the first column, and the first row, the third column as the correction information of the pixel block of the first row, the second column. And taking the average value of the correction information of the pixel blocks of the third column in the first row and the fifth column in the first row as the correction information of the pixel block of the fourth column in the first row.

For example, if the controller determines the first row and first column correction information 3 and the correction information 4 for the pixel block of the first row and third column according to the determination method of the correction information for the pixel block described above, the first distance information for the pixel block of the first row and third column may be determined according to the average of the first distance information in the correction information 3 and the first distance information in the correction information 4. The second distance information of the pixel blocks of the first row and the third column may be determined according to an average of the second distance information in the correction information 3 and the second distance information in the correction information 4.

The embodiment shown in fig. 8 brings at least the following advantages: by projecting the correction chart card on the projection screen and based on the display effect of the correction chart card on the projection screen, the degree of chromatic aberration caused by the projection lens on different pixel blocks in one image can be known, so that accurate chromatic aberration correction information can be acquired, and the projection image to be projected can be corrected well in the subsequent projection process.

In some embodiments, the image correction method described above is equally applicable to application scenarios of projection fusion.

The projection fusion is to overlap the edges of the projection pictures projected by a group of projection devices (two or more than two projection devices), and to display a whole picture which is bright, ultra-large and high-resolution without gaps by a fusion technology, so that the picture effect is equal to that of the picture projected by one projector. The multimedia technology is applicable to scenes such as multimedia exhibition and display, exhibition multimedia equipment, new products or news releases.

It should be understood that in an application scenario of projection fusion, the projected image displayed on the projection screen may also exhibit an "image dispersion" phenomenon.

As a possible implementation manner, before the group of projection devices projects the image to be projected, each projection device may correct the image to be projected of each projection device based on the image correction method. Further, each projection device in the group of projection devices in the projection fusion scene may respectively project the corrected images to be projected, and perform projection fusion on each corrected image to be projected.

Optionally, in an application scenario of projection fusion, a complete projection screen of a set of projection devices may include an overlapping portion and a non-overlapping portion.

Illustratively, as shown in fig. 10, a projection screen for projection fusion display is performed for two projection apparatuses. The area a and the area c are non-overlapping parts of the projection pictures, and the area b is an overlapping part of the projection pictures.

Further, in the case where the "image dispersion" phenomenon occurs in the overlapping or non-overlapping portions of the projection screens, the group of projection apparatuses may perform image correction on the overlapping or non-overlapping portions in the fused projection images based on the above-described image correction method.

For example, taking the projection screen shown in fig. 10 as an example, if the "image dispersion" phenomenon occurs in the region b, the control device for projection fusion may perform image correction on only the region b in the projection image based on the above-mentioned image correction method.

The above description has presented the scheme provided herein primarily from a methodological perspective. It is to be understood that the image correction apparatus includes hardware structures and/or software modules corresponding to the respective functions in order to implement the above-described functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. 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 present application may divide the functional modules of the image correction apparatus according to the above method examples, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

Fig. 11 is a schematic diagram illustrating a composition of an image correction apparatus according to an embodiment of the present application. As shown in fig. 11, the image correction apparatus 1000 includes a transceiver unit 1001 and a processing unit 1002.

A transceiving unit 1001 configured to acquire color difference correction information.

The processing unit 1002 is configured to modify, according to the color difference correction information, original coordinates of the N base color sub-pixel blocks of each pixel block in the image to be projected, so as to obtain modified coordinates of the N base color sub-pixel blocks of each pixel block in the image to be projected.

The processing unit 1002 is further configured to project the image to be projected onto the projection screen through the projection assembly according to the corrected coordinates of the N basic color sub-pixel blocks of each pixel block in the image to be projected.

In some embodiments, the processing unit 1002 is specifically configured to: in response to the correction instruction, projecting the correction chart onto a projection screen; and acquiring chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

In some embodiments, the primary colors include red, green, and blue.

In some embodiments, for each pixel block in the image to be projected, the processing unit 1002 is specifically configured to: determining correction information matched with a pixel block of an image to be projected from the color difference correction information; and correcting the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

In some embodiments, the processing unit 1002 is specifically configured to: taking the original coordinates of a first primary color sub-pixel block in a pixel block of the image to be projected as the correction coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected; and modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

In some embodiments, the processing unit 1002 is specifically configured to: according to the first distance information, modifying the original horizontal coordinate of a second primary color sub-pixel block in the pixel block of the image to be projected to obtain a modified horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected; and according to the second distance information, modifying the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected to obtain the modified vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected.

The elements of FIG. 11 may also be referred to as modules, and the processing elements may be referred to as processing modules, for example. In the embodiment shown in fig. 11, the names of the respective units may not be those shown in the figure, and for example, the transmitting and receiving unit may be referred to as a communication unit.

The respective units in fig. 11, if implemented in the form of software functional modules and sold or used as separate products, may be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or all or part of the technical solutions may be implemented in the form of a software product stored in a storage medium, and including several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. A storage medium storing a computer software product comprising: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The embodiment of the present application further provides a schematic diagram of a hardware structure of an image correction apparatus, as shown in fig. 12, the image correction apparatus 2000 includes a processor 2001, and optionally, a memory 2002 and a transceiver 2003 connected to the processor 2001. The processor 2001, memory 2002, and transceiver 2003 are connected by a bus 2004.

The processor 2001 may be a Central Processing Unit (CPU), a general purpose processor Network (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor 2001 may also be any other means having a processing function such as a circuit, device or software module. The processor 2001 may also include a plurality of CPUs, and the processor 2001 may be one single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).

Memory 2002 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, but is not limited to, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 2002 may be separate or integrated with the processor 2001. The memory 2002 may include, among other things, computer program code. The processor 2001 is configured to execute the computer program code stored in the memory 2002, thereby implementing the methods provided by the embodiments of the present application.

The transceiver 2003 may be used to communicate with other devices or communication networks (e.g., ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), etc.). The transceiver 2003 may be a module, a circuit, a transceiver, or any device capable of enabling communication.

The bus 2004 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 2004 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 12, but this is not intended to represent only one bus or type of bus.

The embodiment of the present application further provides a computer-readable storage medium, which includes computer-executable instructions, and when the computer-readable storage medium is run on a computer, the computer is caused to execute any one of the methods provided by the above embodiments.

The embodiments of the present application also provide a computer program product containing instructions for executing a computer, which when executed on a computer, causes the computer to perform any one of the methods provided by the above embodiments.

An embodiment of the present application further provides a chip, including: a processor coupled to the memory through the interface, and an interface, when the processor executes the computer program or the computer execution instructions in the memory, the processor causes any one of the methods provided by the above embodiments to be performed.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer-executable instructions. The processes or functions described in accordance with the embodiments of the present application occur, in whole or in part, when computer-executable instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer executable instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer executable instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A projection device, comprising:

a controller configured to:

acquiring chromatic aberration correction information;

correcting original coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected;

and according to the corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected, projecting the image to be projected onto the projection screen through the projection assembly.

2. The projection device of claim 1, wherein the controller is further configured to:

in response to a correction instruction, projecting a correction chart onto the projection screen;

and acquiring the chromatic aberration correction information according to the display effect of the correction chart on the projection screen.

3. The projection device of claim 2, wherein the correction card comprises a plurality of pixel blocks, the pixel blocks being comprised of N primary color sub-pixel blocks;

the color difference correction information comprises correction information of each pixel block in the correction chart, and the correction information of the pixel block is determined according to the relative position relation of each primary color sub-pixel block in the pixel block on the projection screen.

4. The projection apparatus according to claim 3, wherein the correction information of the pixel block includes first distance information indicating a distance in a horizontal direction between a first color sub-pixel block and a second color sub-pixel block among the pixel blocks on the projection screen, and second distance information indicating a distance in a vertical direction between the first color sub-pixel block and the second color sub-pixel block among the pixel blocks on the projection screen, the first color sub-pixel block being any one of the pixel blocks, the second color sub-pixel block being the other one of the pixel blocks except for the first color sub-pixel block.

5. The projection device of claim 4, wherein the primary colors comprise red, green, and blue.

6. The projection device of claim 4 or 5, wherein the controller is specifically configured to:

for each pixel block in the image to be projected, determining correction information matched with the pixel block of the image to be projected from the color difference correction information;

and correcting the original coordinates of each primary color sub-pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected to obtain the corrected coordinates of each primary color sub-pixel block of the image to be projected.

7. The projection device of claim 6, wherein the controller is specifically configured to:

taking the original coordinates of a first primary color sub-pixel block in the pixel block of the image to be projected as the correction coordinates of the first primary color sub-pixel block in the pixel block of the image to be projected;

and modifying the original coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected according to the correction information matched with the pixel block of the image to be projected so as to obtain the modified coordinates of the second primary color sub-pixel block in the pixel block of the image to be projected.

8. The projection device of claim 7, wherein the controller is specifically configured to:

according to the first distance information, modifying the original horizontal coordinate of a second primary color sub-pixel block in the pixel block of the image to be projected to obtain a modified horizontal coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected; and the number of the first and second groups,

and modifying the original vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected according to the second distance information to obtain the modified vertical coordinate of the second primary color sub-pixel block in the pixel block of the image to be projected.

9. A projection system, comprising:

a projection screen and a projection device as claimed in any one of claims 1 to 8.

10. An image correction method, characterized in that the method comprises:

acquiring chromatic aberration correction information;

correcting original coordinates of N primary color sub-pixel blocks of each pixel block in the image to be projected according to the color difference correction information to obtain corrected coordinates of the N primary color sub-pixel blocks of each pixel block in the image to be projected;