CN105635703A - Projection method and device based on image geometric correction coordinate compression and projector - Google Patents
Projection method and device based on image geometric correction coordinate compression and projector Download PDFInfo
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- CN105635703A CN105635703A CN201510994250.6A CN201510994250A CN105635703A CN 105635703 A CN105635703 A CN 105635703A CN 201510994250 A CN201510994250 A CN 201510994250A CN 105635703 A CN105635703 A CN 105635703A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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Abstract
The invention discloses a projection method and device based on image geometric correction coordinate compression and a projector. The method comprises the steps that a projection request triggered by a user is received; original image coordinates and corresponding coordinate offset are acquired according to the currently set resolution; adding operation is performed on the original image coordinates and the corresponding coordinate offset so that projection image coordinates are obtained; and an image to be projected is displayed on a screen according to the projection image coordinates. The projection image coordinates can be obtained according to the original image coordinates and the corresponding coordinate offset, and storage space occupied by the coordinate offset is far less than storage space occupied by direct storage of the projection image coordinates so that storage resources can be saved.
Description
Technical field
The embodiment of the present invention relates to picture Processing Technique field, particularly relates to a kind of method of projection based on the compression of image Geometry rectification coordinate and device and projector.
Background technology
Projector, also known as projector, be a kind of can by picture or VIDEO PROJECTION to the equipment on curtain, it is possible to be connected with computer or game machine etc. by different interfaces and play corresponding vision signal. Projector is widely used in family, office, school and public place of entertainment, different according to mode of operation, there is cathode tube (CathodeRayTube, CRT), liquid-crystal display (LiquidCrystalDisplay, LCD) projector, digital light process (DigitalLightProcession, DLP) projector etc. are dissimilar.
The curtain of projector is placed on wall usually, and wall has uneven part rather, the picture distortion that may cause projecting like this, thus make the picture projected seem so not clear, and the picture in order to make projection go out seems clear and natural more, it is necessary to according to original image, the displaing coordinate of projection image is carried out geometry correction.
In prior art, projector may support the projection pattern of multiple resolving power, for different resolving power, projector prestores original image coordinate corresponding under each resolving power and the corresponding relation of the corresponding projection image coordinate that can normally show through geometry correction. When projecting, according to the resolving power that user selects, it is determined that the original image coordinate of picture to be projected, and then according to original image coordinate, find corresponding projection image coordinate, thus according to projection image coordinate, picture to be projected is displayed on curtain.
And above-mentioned method of projection exists following shortcoming: along with increasing of resolving power, the original image coordinate stored in projector and the data volume of projection image coordinate also can increase, thus take more storage resources.
Summary of the invention
The embodiment of the present invention provides a kind of method of projection based on the compression of image Geometry rectification coordinate and device and projector, it is possible to save storage resources.
First aspect, embodiments provides a kind of method of projection based on the compression of image Geometry rectification coordinate, comprising:
Receive the projection request that user triggers;
Original image coordinate and corresponding coordinate offset amount is obtained according to the current resolving power arranged;
Described original image coordinate and corresponding coordinate offset amount are summed up computing, obtains projection image coordinate;
According to described projection image coordinate, picture to be projected is displayed on curtain.
Second aspect, the embodiment of the present invention also provides a kind of projection arrangement based on the compression of image Geometry rectification coordinate, comprising:
Receiver module, for receiving the projection request that user triggers;
Acquisition module, for obtaining original image coordinate and corresponding coordinate offset amount according to the current resolving power arranged;
Calculate module, for described original image coordinate and corresponding coordinate offset amount are summed up computing, obtain projection image coordinate;
Projection module, for being displayed in curtain according to described projection image coordinate by picture to be projected.
The third aspect, the embodiment of the present invention also provides a kind of projector, comprises the projection arrangement based on the compression of image Geometry rectification coordinate described in second aspect.
The embodiment of the present invention obtains original image coordinate and corresponding coordinate offset amount by the current resolving power arranged, directly measure projection image coordinate according to original image coordinate and corresponding coordinate offset, and without the need to directly storing projection image coordinate corresponding to this original image coordinate, and the storage space that coordinate offset amount takies is far smaller than the storage space directly storing projection image coordinate and taking, thus save storage resources.
Accompanying drawing explanation
The schematic flow sheet of the method for projection based on the compression of image Geometry rectification coordinate that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the projection arrangement based on the compression of image Geometry rectification coordinate that Fig. 2 provides for the embodiment of the present invention two;
The structural representation of the projector that Fig. 3 provides for the embodiment of the present invention three.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail. It should be appreciated that specific embodiment described herein is only for explaining the present invention, but not limitation of the invention. It also should be noted that, for convenience of description, accompanying drawing illustrate only part related to the present invention and not all structure.
Embodiment one
The schematic flow sheet of the method for projection based on the compression of image Geometry rectification coordinate that Fig. 1 provides for the embodiment of the present invention one, the executive agent of the method for projection that the embodiment of the present invention provides, can be projection arrangement and projector that the embodiment of the present invention provides, this projection arrangement can adopt hardware or software simulating. As shown in Figure 1, the present embodiment specifically comprises the steps:
Step 11, the projection request receiving user's triggering;
Wherein, described projection request can be the instruction that user opens projection arrangement.
Step 12, the coordinate offset amount obtaining original image coordinate and correspondence according to the current resolving power arranged;
Wherein, the resolving power of described current setting can be system start after default resolution, it is possible to for user open after the resolving power of self-defined setting. Wherein, the x coordinate of described coordinate offset amount and/or the storage space of y-coordinate generally take 1��4 byte.
Wherein, for the ease of storing, described original image coordinate and corresponding coordinate offset amount can adopt the form of vector to represent. Such as, when storing, by line scanning, column scan, staggered scanning or the scanning of Z font, the coordinate and corresponding skew amount that obtain each pixel position are formed vector.
Concrete, the original image coordinate that each resolving power of described projection arrangement support is corresponding and coordinate offset amount all prestore in the local database, when after open command user being detected, can search from local data base according to the current resolving power arranged and get corresponding original image coordinate, and then get corresponding coordinate offset amount according to original image coordinate.
Wherein, each resolving power can adopt the form as shown in following table one to store with corresponding original image coordinate and coordinate offset amount:
Table one
Step 13, the coordinate offset amount of described original image coordinate and correspondence is summed up computing, obtain projection image coordinate;
Wherein, described projection image coordinate is finally be displayed on curtain and coordinate corresponding to the picture to be projected that can normally show.
Concrete, can directly calculate described original image coordinate and the sum of corresponding coordinate offset amount, will with as projection image coordinate. When specifically calculating, need to ensure that the original image coordinate of same pixel point position and coordinate offset amount are added.
Step 14, according to described projection image coordinate, picture to be projected is displayed on curtain.
After determining projection image coordinate, then pixel correspondence is displayed on corresponding position by picture to be projected according to projection image coordinate.
The present embodiment obtains original image coordinate and corresponding coordinate offset amount by the current resolving power arranged, directly measure projection image coordinate according to original image coordinate and corresponding coordinate offset, and without the need to directly storing projection image coordinate corresponding to this original image coordinate, and the storage space that coordinate offset amount takies is far smaller than the storage space directly storing projection image coordinate and taking, thus save storage resources.
Exemplary, on the basis of above-described embodiment, described method also comprises the correlation step determining original image coordinate and skew amount, specific as follows:
For each resolving power, test picture is projected in mesh coordinate, obtain original image coordinate according to mesh coordinate;
Described original image coordinate is carried out geometry correction, until described test picture is normally displayed on curtain, using the projection coordinate after geometry correction as projection image coordinate;
Calculate the difference between described original image coordinate and projection image coordinate, obtain coordinate offset amount;
Described original image coordinate and corresponding coordinate offset amount are stored in this locality.
In an optional embodiment, original image coordinate is carried out geometry correction and specifically comprises:
According to virtual borderlines parameter, projection image is mapped original image, to realize the geometry correction to original image coordinate.
Wherein, virtual borderlines parameter comprises following data structure:
{ coordinate of projection image pixel, the coordinate of original image pixel }.
Growing along with image resolution rate, virtual borderlines parameter also increases thereupon. The bandwidth of transmission of coordinate mapping parameters also increases thereupon.
For this reason, in an optional embodiment, the method also comprises:
When storing coordinate mapping parameters, store the positional information of projection image pixel and the coordinate of original image pixel.
For example, it is assumed that virtual borderlines parameter is as follows:
{(x0,y0),(m0,n0)}
{(x1,y0),(m1,n0)}
{(x2,y0),(m2,n0)}
{(x3,y0),(m3,n0)}
Owing to projection image pixel coordinate is order change, so coordinate (x0, y0) to (x3, y0) can be recovered by the positional information of the projection image pixel stored.
Preferably, on the basis of above-described embodiment, when storing the coordinate of original image pixel, it is also possible to according to the relative position between original image pixel coordinate, store the coordinate of original image pixel.
Because projection image is the consecutive variations of original image, it it not unexpected change. So, when storing original image pixel coordinate, it is possible to use the relative position of original image pixel coordinate, such that it is able to save store content.
Illustrate below and the embodiment of the present invention is described in detail, think and understand the present invention better.
Being the image of 4096x2160 for resolving power, corresponding x, y displaing coordinate scope is respectively 0��x < 4096,0��y < 2160, then x, y need the storage space taken to be 12bit.
If adopting full coordinate of the prior art to store, then the storage space storing original image coordinate and corresponding projection image coordinate needs is:
The original image coordinate of 4096x2160x{ projection image coordinate+correspondence }
=4096x2160x{24bit+24bit}=2430Mbit
And adopt the method described in the present embodiment, and only storing the positional information of original image coordinate and projection image pixel, then the storage space that storage original image coordinate takies is:
4096x2160x12x12=1274019840bit=1215Mbit
If when storing the coordinate of original image pixel, storing the relative position of original image coordinate, the x that coordinate offset amount is corresponding, y displaing coordinate adopts 4bit to store, then the storage space taken is:
4096x2160x4x4=141557760bit=135Mbit
It may be seen that the data volume 2340Mbit from prior art stored is compressed to 1215Mbit+135Mbit, it is seen that save a large amount of storage resources.
Embodiment two
The structural representation of the projection arrangement based on the compression of image Geometry rectification coordinate that Fig. 2 provides for the embodiment of the present invention two, as shown in Figure 2, specifically comprises: receiver module 21, acquisition module 22, calculating module 23 and projection module 24;
The projection request that described receiver module 21 triggers for receiving user;
Described acquisition module 22 for obtaining original image coordinate and corresponding coordinate offset amount according to the current resolving power arranged;
Described calculating module 23, for described original image coordinate and corresponding coordinate offset amount are summed up computing, obtains projection image coordinate;
Described projection module 24 is for being displayed in curtain according to described projection image coordinate by picture to be projected.
The projection arrangement based on the compression of image Geometry rectification coordinate described in the embodiment of the present invention is for performing the method for projection described in the various embodiments described above, and the technique effect of its know-why and generation is similar, is not repeated here.
Exemplary, the described projection arrangement based on the compression of image Geometry rectification coordinate also comprises offset determination module 25. This offset determination module 25 comprises: geometry correction module, calculating module and the first memory module. Wherein, geometry correction module is used for for each resolving power, projects in mesh coordinate by test picture, obtains original image coordinate according to mesh coordinate; Original image coordinate is carried out geometry correction, until test picture is normally displayed on curtain; Calculate module to be used for calculating the difference between original image coordinate and projection image coordinate using the projection coordinate after geometry correction as projection image coordinate, obtaining coordinate offset amount; First memory module is used for original image coordinate and corresponding coordinate offset amount are stored in this locality.
In one preferably embodiment, geometry correction module can also be specifically for:
According to virtual borderlines parameter, projection image is mapped original image, to realize the geometry correction to original image coordinate.
In one preferably embodiment, said apparatus can also comprise the 2nd memory module. Wherein, the 2nd memory module is used for when storing coordinate mapping parameters, stores the positional information of projection image pixel and the coordinate of original image pixel.
In one preferably embodiment, the 2nd memory module can also specifically comprise the 3rd memory module. Wherein, the 3rd memory module is used for according to the relative position between original image pixel coordinate, stores the coordinate of original image pixel.
Embodiment three
The structural representation of the projector that Fig. 3 provides for the embodiment of the present invention three, as shown in Figure 3, the projector 31 of the present embodiment, comprises the projection arrangement 32 described in above-described embodiment.
Projector described in the embodiment of the present invention is for performing the method for projection described in the various embodiments described above, and the technique effect of its know-why and generation is similar, is not repeated here.
Note, above are only the better embodiment of the present invention and institute's application technology principle. It is understood by those skilled in the art that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and protection scope of the present invention can not be departed from. Therefore, although being described in further detail invention has been by above embodiment, but the present invention is not limited only to above embodiment, when not departing from present inventive concept, other equivalence embodiments more can also be comprised, and the scope of the present invention is determined by appended right.
Claims (12)
1. the method for projection based on the compression of image Geometry rectification coordinate, it is characterised in that, comprising:
Receive the projection request that user triggers;
Original image coordinate and corresponding coordinate offset amount is obtained according to the current resolving power arranged;
Described original image coordinate and corresponding coordinate offset amount are summed up computing, obtains projection image coordinate;
According to described projection image coordinate, picture to be projected is displayed on curtain.
2. method according to claim 1, it is characterised in that, also comprise:
For each resolving power, test picture is projected in mesh coordinate, obtain original image coordinate according to described mesh coordinate;
Described original image coordinate is carried out geometry correction, until described test picture is normally displayed on curtain, using the projection coordinate after geometry correction as projection image coordinate;
Calculate the difference between described original image coordinate and projection image coordinate, obtain coordinate offset amount;
Described original image coordinate and corresponding coordinate offset amount are stored in this locality.
3. method according to claim 1 and 2, it is characterised in that, the described x coordinate of coordinate offset amount and/or the storage space of y-coordinate take 1��4 byte.
4. method according to claim 2, it is characterised in that, described described original image coordinate is carried out geometry correction, specifically comprise:
According to virtual borderlines parameter, described projection image is mapped described original image, to realize the geometry correction to described original image coordinate.
5. method according to claim 4, it is characterised in that, described method also comprises:
When storing described virtual borderlines parameter, store the positional information of described projection image pixel and the coordinate of described original image pixel.
6. method according to claim 5, it is characterised in that, the coordinate of the described original image pixel of described storage specifically comprises:
According to the relative position between described original image pixel coordinate, store the coordinate of described original image pixel.
7. the projection arrangement based on the compression of image Geometry rectification coordinate, it is characterised in that, comprising:
Receiver module, for receiving the projection request that user triggers;
Acquisition module, for obtaining original image coordinate and corresponding coordinate offset amount according to the current resolving power arranged;
Calculate module, for described original image coordinate and corresponding coordinate offset amount are summed up computing, obtain projection image coordinate;
Projection module, for being displayed in curtain according to described projection image coordinate by picture to be projected.
8. device according to claim 7, it is characterised in that, described device also comprises offset determination module, and described offset determination module comprises:
Geometry correction module, for for each resolving power, projecting in mesh coordinate by test picture, obtains original image coordinate according to described mesh coordinate; Described original image coordinate is carried out geometry correction, until described test picture is normally displayed on curtain;
Calculate module, for using the projection coordinate after geometry correction as projection image coordinate, calculate the difference between described original image coordinate and projection image coordinate, obtain coordinate offset amount;
First memory module, for being stored in this locality by described original image coordinate and corresponding coordinate offset amount.
9. device according to claim 8, it is characterised in that, described geometry correction module specifically for:
According to virtual borderlines parameter, described projection image is mapped described original image, to realize the geometry correction to described original image coordinate.
10. device according to claim 9, it is characterised in that, described device also comprises:
2nd memory module, for when storing described virtual borderlines parameter, storing the positional information of described projection image pixel and the coordinate of described original image pixel.
11. devices according to claim 10, it is characterised in that, described 2nd memory module also specifically comprises:
3rd memory module, for according to the relative position between described original image pixel coordinate, storing the coordinate of described original image pixel.
12. 1 kinds of projector, comprise the projection arrangement based on the compression of image Geometry rectification coordinate according to any one of claim 7 to 11.
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| CN106507077A (en) * | 2016-11-28 | 2017-03-15 | 江苏鸿信系统集成有限公司 | Projecting apparatus picture based on graphical analysis is corrected and blocks preventing collision method |
| CN106504407A (en) * | 2016-11-01 | 2017-03-15 | 深圳怡化电脑股份有限公司 | A kind of method and device for processing banknote image |
| CN109873997A (en) * | 2019-04-03 | 2019-06-11 | 贵安新区新特电动汽车工业有限公司 | Projected picture correcting method and device |
| CN110864649A (en) * | 2019-11-25 | 2020-03-06 | 歌尔股份有限公司 | Method for determining compensation value and determining flatness of optical module |
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| CN110864649A (en) * | 2019-11-25 | 2020-03-06 | 歌尔股份有限公司 | Method for determining compensation value and determining flatness of optical module |
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