CN102547306B - Projector and method for correcting colors of projected image of projector - Google Patents
Projector and method for correcting colors of projected image of projector Download PDFInfo
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Abstract
The invention discloses a projector and a method for correcting colors of a projected image of the projector. The method comprises the following steps that: a correction module determines primary colors to be regulated according to a relative position between a color coordinate of the background color of the projection area in a current shot image acquired by a camera module in a color coordinate system and a color coordinate of a target color in the color coordinate system, and transmits brightness regulation values of the primary colors to be regulated to a projection module; and the projection module regulates the brightness of corresponding primary colors of a light source according to the received brightness regulation values of the primary colors to be regulated. According to the projector and the method, hardware cost is low due to adoption of the camera module, namely a universal camera, and matrix calculation is eliminated in the process of regulating the brightness of the three primary colors of the light source of the projector according to the background color of the projection area and the target color; and therefore, by the method for correcting colors, storage resources and computing resources of a system are saved.
Description
Technical field
The present invention relates to shadow casting technique, relate in particular to the method and apparatus that projected image is carried out to color correction.
Background technology
Projecting apparatus is that a kind of being used for amplified the projection arrangement that shows image on screen, has been widely used at present in demonstration and home theater.For example, demonstrate for meeting room and on large-screen, watch film by connecting the equipment such as DVD player in the family.
Projecting apparatus can be applied in many occasions easily, and for example, people conventionally directly demonstrate the projected of projecting apparatus and play to the body of wall of opposite.Display screen by body of wall as projection, and the display screen that is exclusively used in Projection Display need not be installed.
But, in actual conditions body of wall not necessarily white, be likely the body of wall of other color, as ecru, light red etc.Because background colour is not white, this will make projected image also there will be misalignment, occur entirety Huang or the partially red situation of entirety partially.Again or, due to indoor light, also may cause projected image to occur the situation of integral color deviation.
The situation of the misalignment conventionally above-mentioned projected image being occurred, is called white balance unbalance.Now, the light source color that can go out by adjusting projector projects, carries out color correction, reaches predetermined white balance.
In 03123743.6 " projection plane color correcting method, system and the program of projector ", a kind of method of projected image being carried out to color correction is described: by spectral information or the color information of color sensor acquired projections plane, the information that use records, as spectral reflectivity, calculate calibrated three primary colors combined amount through a series of matrixing, adjust projector light source according to calibrated three primary colors combined amount, reach the object of projected image being carried out to color correction.
But the color calibration method of the prior art is comparatively complicated, is embodied in: first, special color sensor need to be set in projecting apparatus, cause hardware cost higher; Secondly, the process more complicated of the three primary colors combined amount after calculation correction, need to there is corresponding transition matrix under the memory stores different color information of larger capacity, in computational process, also need to carry out comparatively complicated matrix operation, need more storage resources and calculation process resource.Therefore, the color calibration method of prior art has higher cost, need to expend more hardware cost, and storage resources and calculation process resource.
Summary of the invention
The embodiment of the present invention provides a kind of projecting apparatus and method for correcting colors of projected image thereof, in order to reduce the cost of color correction, saves system resource.
According to an aspect of the present invention, provide a kind of method for correcting colors of projected image, having comprised: A, view field projecting apparatus being projected on display screen by photographing module have taken, and obtain photographic images; B, by correction module according to the background colour of the view field in the current photographic images obtaining of described photographing module the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module; C, by projection module according to the brightness adjustment value of primary colours to be adjusted receiving, adjust the brightness of the corresponding primary colours of light source; D, continued to obtain the photographic images of described photographing module current shooting by correction module, and when the chromaticity coordinates in hue coordinate system is less than set point with the relative distance between the chromaticity coordinates of object color component in hue coordinate system at the background colour of determining the view field in the current photographic images obtaining of described photographing module, finish this time correction; Otherwise, repeating step B, C, D.
After described steps A, also comprise: by authentication module, view field in described photographic images is carried out to cross-color judgement, and cross-color judged result is sent to described correction module; And, by correction module according to the background colour of the view field in the current photographic images obtaining of described photographing module the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system, determine that primary colours to be adjusted comprise: described correction module is after definite described cross-color judged result is distortion, relative position between chromaticity coordinates according to the background colour of the view field in the current photographic images obtaining of described photographing module in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system, determines primary colours to be adjusted.
Preferably, described authentication module carries out cross-color judgement to view field in described photographic images and comprises: if the distance between chromaticity coordinates and the chromaticity coordinates of object color component in hue coordinate system of the background colour of the view field in the definite current photographic images obtaining of described photographing module of described authentication module in hue coordinate system exceedes setpoint distance value, determine that described cross-color judged result is distortion; Otherwise, determine that described cross-color judged result is undistorted.
Preferably, described correction module is the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of described photographing module, determine that primary colours to be adjusted comprise: among straight line RW, GW, BW, determine the straight line nearest with T point, determine corresponding primary colours to be adjusted according to the nearest straight line of determining;
Or, if T point is positioned at little triangle GWM or BWN, determine primary colours to be adjusted be R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point is positioned at little triangle GWP or RWN, determine primary colours to be adjusted be B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point is positioned at little triangle RWM or BWP, determine primary colours to be adjusted be G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
If T point overlaps with BW extended line or is less than Second Threshold, determine that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point overlaps with RW extended line or is less than Second Threshold, determine that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point overlaps with GW extended line or is less than Second Threshold, determine that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
Wherein, the chromaticity coordinates of three primary light source is respectively R, G, B point in described hue coordinate is, the chromaticity coordinates of described object color component is W point in hue coordinate system, and the chromaticity coordinates of the background colour of the view field in the current photographic images obtaining of described photographing module is T point in hue coordinate system; Straight line RW, GW, BW cross respectively straight line BG, BR, GR in a P, N, M, and triangle RGB is divided into GWM, BWN, GWP, RWN, the little triangle of RWM, BWP.
Wherein, the nearest straight line that described basis is determined determines that corresponding primary colours to be adjusted comprise:
If T point and the nearest straight line of determining coincide, or distance between T point and the nearest straight line determined is less than first threshold, determines corresponding primary colours to be adjusted according to the position relationship between W point and T point.
According to another aspect of the present invention, also provide a projecting apparatus, having comprised: photographing module, take for the view field that projecting apparatus is projected on display screen, obtain photographic images; Correction module, for the relative position between the chromaticity coordinates in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system according to the background colour of the view field of the current photographic images obtaining of described photographing module, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module; Projection module, for according to the brightness adjustment value of the primary colours to be adjusted that receive, adjusts the brightness of the corresponding primary colours of light source; Described correction module is also for continuing to obtain the photographic images of described photographing module current shooting, and when the chromaticity coordinates in hue coordinate system is less than set point with the relative distance between the chromaticity coordinates of object color component in hue coordinate system at the background colour of determining the view field in the current photographic images obtaining of described photographing module, finish this time correction; Otherwise, continue the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of described photographing module, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module.
Further, described projecting apparatus also comprises: authentication module, carries out cross-color judgement for described photographic images view field, and cross-color judged result is sent to described correction module; And, described correction module is also for after being distortion in definite described cross-color judged result, relative position between chromaticity coordinates according to the background colour of the view field in the current photographic images obtaining of described photographing module in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system, determines primary colours to be adjusted.
Wherein, described authentication module is the chromaticity coordinates in hue coordinate system specifically for the background colour of determining the view field in the current photographic images obtaining of described photographing module, with the distance of object color component between the chromaticity coordinates in hue coordinate system exceed setpoint distance value, determine that described cross-color judged result is distortion; Otherwise, determine that described cross-color judged result is undistorted.
Described correction module determines that primary colours to be adjusted comprise:
Described correction module is determined the straight line nearest with T point among straight line RW, GW, BW, determines corresponding primary colours to be adjusted according to the nearest straight line of determining;
Or if T point is positioned at little triangle GWM or BWN, described correction module determines that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point is positioned at little triangle GWP or RWN, described correction module determines that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point is positioned at little triangle RWM or BWP, described correction module determines that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
If T point overlaps with BW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point overlaps with RW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point overlaps with GW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of,
Wherein, the chromaticity coordinates of three primary light source is respectively R, G, B point in described hue coordinate is, the chromaticity coordinates of described object color component is W point in hue coordinate system, and the chromaticity coordinates of the background colour of the view field in the current photographic images obtaining of described photographing module is T point in hue coordinate system; Straight line RW, GW, BW cross respectively straight line BG, BR, GR in a P, N, M, and triangle RGB is divided into GWM, BWN, GWP, RWN, the little triangle of RWM, BWP.
Wherein, described correction module is determined the straight line nearest with T point among straight line RW, GW, BW, determines that according to the nearest straight line of determining corresponding primary colours to be adjusted comprise:
If described correction module is determined T point and described nearest straight line coincides, or distance between T point and described nearest straight line is less than first threshold, determines corresponding primary colours to be adjusted according to the position relationship between W point and T point.
The projecting apparatus of the embodiment of the present invention is owing to adopting photographing module to take the view field on display screen, analyze the background colour of view field, according to the background colour of the view field analyzing and object color component, adjust the three primary colors brightness of projector light source, reach the object of color correction, there is lower hardware cost and photographing module is general camera; And, according to the background colour of the view field analyzing and object color component, in the process of the three primary colors brightness of adjustment projector light source, do not need to adopt matrix computations, therefore save memory and the required calculation process resource expending of matrix operation process for storage matrix, thereby greatly saved system resource.
Accompanying drawing explanation
Fig. 1 a, 1b are the structured flowchart of the projecting apparatus of the embodiment of the present invention;
The method for correcting colors of projected image flow chart that Fig. 2,4 is the embodiment of the present invention;
Fig. 3 is the chromaticity coordinates of hue coordinate Xi Zhong view field background colour of the embodiment of the present invention and the schematic diagram of the chromaticity coordinates of object color component;
Fig. 5 is the schematic diagram that the adjustment T point of the embodiment of the present invention overlaps with W point.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.But, it should be noted that, many details of listing in specification are only used to make reader to have a thorough understanding to one or more aspects of the present invention, even if do not have these specific details also can realize these aspects of the present invention.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant to computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: thread, program and/or the computer of the process moved on processor, processor, object, executable program, execution.For instance, the application program of moving on computing equipment and this computing equipment can be modules.One or more modules can be positioned at an executory process and/or thread, and module also can and/or be distributed on a computer between two or more computers.In addition, can carry out these modules by the multiple computer-readable medium of having stored plurality of data structures.These modules can communicate by signal utilization this locality and/or remote process.
In the technical scheme of the embodiment of the present invention, adopt photographing module to take the view field on display screen, analyze the background colour of view field, according to the background colour of the view field analyzing and object color component, adjust the three primary colors brightness of projector light source, reach the object that projected image integral color is proofreaied and correct.Because photographing module is that general camera has lower hardware cost.And according to the background colour of the view field analyzing and object color component, in the process of the three primary colors brightness of adjustment projector light source, do not need to adopt matrix computations, therefore save memory and the required calculation process resource expending of matrix operation process for storage matrix, thereby greatly saved system resource.
Describe the technical scheme of the embodiment of the present invention in detail below in conjunction with accompanying drawing.As shown in Figure 1a, a kind of projecting apparatus that the embodiment of the present invention provides comprises: photographing module 101, projection module 102, correction module 103.
Further, as shown in Figure 1 b, the projecting apparatus of the embodiment of the present invention can also comprise: authentication module 104.
Particularly, after the cross-color judged result that correction module 103 Receipt Validation modules 104 send, determine whether to carry out color correction process according to cross-color judged result:
If cross-color judged result is distortion, correction module 103, according to the background colour of the view field in the current photographic images obtaining of photographing module, is determined primary colours to be adjusted, and the brightness adjustment value of primary colours to be adjusted is sent to projection module 102; Projection module 102, according to the brightness adjustment value of the primary colours to be adjusted that receive, is adjusted the brightness of the corresponding primary colours of light source afterwards; The view field that photographing module 101 continues the projection module 102 of projecting apparatus to project on display screen takes, and obtains photographic images.Correction module 103 continues to obtain the photographic images of photographing module 101 current shooting, and when the chromaticity coordinates in hue coordinate system is less than set point with the relative distance between the chromaticity coordinates of object color component in hue coordinate is at the background colour of determining the view field in the current photographic images obtaining of photographing module 101, finish this color correction; Otherwise, continue the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of described photographing module, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is continued to send to projection module 102.Concrete color correction process method will be introduced follow-up.If cross-color judged result is undistorted, correction module 103 needn't carry out color correction process, does not send the brightness adjustment value of primary colours to be adjusted to projection module 102.Projection module 102 does not change the luminance primary of projection light source.
The cross-color judgement of the projecting apparatus of the embodiment of the present invention, the flow process of trimming process, as shown in Figure 2.At step S201, projection module 102 projects light onto on display screen, demonstrates the higher view field of brightness on display screen.Next,, at step S202, the view field that photographing module 101 projects on display screen the projection module 102 of projecting apparatus takes, and obtains photographic images.
At step S203, the current photographic images that authentication module 104 can be taken photographing module 101, carries out cross-color judgement, and cross-color judged result is sent to correction module 103.
Particularly, authentication module 104 can be according to photographic images, the chromaticity coordinates of the background colour of determining the view field in photographic images in hue coordinate system, the distance according to the chromaticity coordinates of background colour and object color component between the chromaticity coordinates in hue coordinate system is carried out cross-color judgement.The chromaticity coordinates of supposing view field's background colour is the T point in hue coordinate system, and the chromaticity coordinates of object color component is the W point (as shown in Figure 3) in hue coordinate system.The chromaticity coordinates of object color component is predefined.Authentication module 104 calculates T point to the distance between W point, if distance exceedes setpoint distance value, determines that cross-color judged result is distortion; Otherwise, determine that described cross-color judged result is undistorted.For example, calculate T point and the W point distance δ in hue coordinate system, as met 0≤δ≤γ, can think and meet the requirements, γ span is redefined for 0≤γ≤0.03.
A kind of concrete grammar of determining the chromaticity coordinates of the background colour of the view field in photographic images can be: because the image of taking is preserved in the mode of pixel-matrix conventionally, each pixel has comprised positional information, the monochrome information of this pixel.Positional information i.e. the position coordinates of this pixel in image, and monochrome information can be the brightness value of this pixel.In the captured image of photographing module 101, both comprise the higher view field of brightness on display screen, also comprised the subregion that there is no projection on display screen.Therefore,, in photographic images, the brightness value of view field is greater than the region that there is no projection.So, the brightness value of the pixel in analysis photographic images can be determined the border of view field.How to determine according to the brightness value of the pixel in photographic images the technology that the border of view field is well known to those skilled in the art, repeat no more herein.After the view field determining in photographic images, determine the chromaticity coordinates on four summits of this view field.The chromaticity coordinates of the background colour of the view field using the mean value of the chromaticity coordinates on these four summits in photographic images.
For example, the chromaticity coordinates of supposing four summits of the view field in photographic images is respectively: (x
c1, y
c1), (x
c2, y
c2), (x
c3, y
c3), (x
c4, y
c4).Chromaticity coordinates (the x of the background colour of the view field in photographic images
c, y
c), determine according to following equation 1,2:
For those skilled in the art can be not only determine and the chromaticity coordinates of the background colour of view field also can adopt the chromaticity coordinates of other point in view field to determine with the chromaticity coordinates on four summits of view field.
Next at step S204, if cross-color judged result is distortion, color correction process is carried out in correction module 103, photographing module 101 and projection module 102 cooperations.If cross-color judged result is undistorted, correction module need not carry out any processing, and projection module will maintain the current luminance primary of light source.
Above-mentioned correction module 103, photographing module 101 and projection module 102 coordinate carry out color correction process detailed process as shown in Figure 4.At step S401, the view field that photographing module 101 projects on display screen projecting apparatus takes, and obtains photographic images.Correction module 103, according to the background colour of the view field in the current photographic images obtaining of photographing module, is determined primary colours to be adjusted (step S402).Particularly, correction module 103 is the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of photographing module 101, determines primary colours to be adjusted.
Particularly, correction module 103 is according to photographic images, the chromaticity coordinates of the background colour of determining the view field in photographic images in hue coordinate system, the chromaticity coordinates in hue coordinate system according to the chromaticity coordinates of background colour and object color component, determine primary colours to be adjusted, make to have adjusted after these primary colours to be adjusted, the background colour of the view field in the photographic images of again taking is close to object color component; Namely, make to have adjusted after these primary colours to be adjusted, the chromaticity coordinates of the background colour of the view field in the photographic images of again taking is close to the chromaticity coordinates of object color component.
Concrete grammar can be as shown in Figure 5, the chromaticity coordinates of three primary light source is respectively R, G, B point in hue coordinate system, the chromaticity coordinates of object color component is W point in hue coordinate system, and the chromaticity coordinates of the view field's background colour in the photographic images of current shooting is T point in hue coordinate system.R, W point is connected and extended obtain straight line RW, G, W point connects and extends and obtains straight line GW, and B, W point connects and extends and obtains straight line BW.
First among straight line RW, GW, BW, determine the straight line nearest with T point, determine the brightness adjustment value of primary colours to be adjusted and these primary colours to be adjusted according to this nearest straight line.Specifically comprise as follows: judge the brightness of adjusting T which primary colours of ordering, can make T point to this nearest rectilinear movement, these primary colours are primary colours to be adjusted.For example, determine T point and straight line BW nearest, be positioned at the same side of straight line BW in Fig. 5 due to T point and G point, can T point be moved to straight line BW by heightening the R luminance primary that T orders, thus, judging these primary colours to be adjusted be R primary colours; Certainly, the brightness of other dichromatism that also can order by reduction T, reduces B and G luminance primary T point is moved to straight line BW, and thus, judging these primary colours to be adjusted is B and G primary colours.
The situation that is less than first threshold or coincides for the distance between T point and nearest straight line, the method for judging these primary colours to be adjusted is: the corresponding primary colours to be adjusted of location positioning according to W point on described nearest straight line.Because the distance between T point and nearest straight line is less than first threshold, be that T point and nearest straight line are very near or coincide, therefore, can make T point mobile to W point along the direction of this nearest straight line, until T point finally approaches or overlaps with W point.Particularly, determine corresponding primary colours to be adjusted according to the position relationship between W point and T point: judge the brightness of adjusting T which primary colours of order, can make T point along the direction of this nearest straight line to the movement of W point, definite these primary colours are primary colours to be adjusted.For example, T point overlaps with straight line BW, can make T point move to W by heightening the B luminance primary that T orders, and thus, judging these primary colours to be adjusted is B primary colours; Certainly, the brightness of other dichromatism that also can order by reduction T, reduces R and G luminance primary T point is moved to W, and judging thus primary colours to be adjusted is R and G primary colours.Those skilled in the art can arrange first threshold according to actual conditions.
Another kind of judge that the preferred approach of primary colours to be adjusted is: as shown in Figure 5, straight line RW comprises line segment between RW and the extended line of RW line segment; Straight line BW comprises line segment between BW and the extended line of BW line segment; Straight line GW comprises line segment between GW and the extended line of GW line segment.First, determine the extended line nearest with T point.The method of judging primary colours to be adjusted is: judge the brightness of adjusting T which primary colours of ordering, can make T point move to this nearest extended line, these primary colours are primary colours to be adjusted.Determination methods and above-mentioned similar repeats no more herein.
The situation that is less than Second Threshold or coincides for the distance between T point and this nearest extended line, the method of judging these primary colours to be adjusted is: judge the brightness of adjusting T which primary colours of ordering, can make T point mobile to W point, these primary colours are primary colours to be adjusted.For example, T point overlaps with the extended line of BW, can make T point move to W by heightening the B luminance primary that T orders, and thus, judging these primary colours to be adjusted is B primary colours.
By this method, can adjust light source by increasing luminance primary, rather than reduce luminance primary and adjust light source.
At step S403, the brightness adjustment value of the primary colours to be adjusted of determining is sent to projection module 102 by correction module 103.Correction module 103 is being determined after primary colours to be adjusted, the brightness adjustment value of these primary colours to be adjusted can be sent to projection module 102.For example, in above-mentioned example, can make T point move to straight line BW by heightening the R luminance primary that T orders, judging thus these primary colours to be adjusted is R primary colours, because being heightens R luminance primary, therefore, brightness adjustment value can be one predetermined on the occasion of.This brightness adjustment value is a predetermined proper step value, by follow-up again and again definite primary colours to be adjusted, and sends brightness adjustment value to projection module 102, makes T point finally approach or overlap with W point.
For another example, in above-mentioned example, the brightness of other dichromatism of ordering by reduction T, reducing B and G luminance primary makes T point move to straight line BW, thus, judging these primary colours to be adjusted is B and G primary colours, because being reduces B and G luminance primary, therefore, the brightness adjustment value of B and G can be a predetermined negative value.
At step S404, projection module 102, according to the brightness adjustment value of the primary colours to be adjusted that receive, is adjusted the brightness of the corresponding primary colours of light source.Particularly, projection module 102 is receiving after the brightness adjustment value of primary colours to be adjusted, and for example, brightness adjustment value is the brightness adjustment value of R primary colours, and this brightness adjustment value is being for just, certain brightness of the R primary colours of the corresponding raising light source of projection module 102.For another example, brightness adjustment value is the brightness adjustment value of B and G primary colours, and this brightness adjustment value is for negative, the B of the corresponding reduction light source of projection module 102 and certain brightness of G primary colours.Projection module 102 improves or reduces the degree of luminance primary and determines according to the absolute value of brightness adjustment value.Adjusted at projection module 102 after the luminance primary of light source, the background colour that projects to the image on display screen will change.
At step S405, correction module 103 continues to obtain the photographic images of photographing module 101 current shooting, and judges whether the relative distance between the chromaticity coordinates of background colour and the chromaticity coordinates of object color component of the view field in the current photographic images obtaining is less than set point; If be less than, finish this color correction, execution step S406; Otherwise, repeating step S402-S405.
Having adjusted at projection module 102 after the luminance primary of light source, also can there is respective change in the background colour of the view field in the photographic images that photographing module 101 obtains.The chromaticity coordinates of background colour and the chromaticity coordinates of object color component that correction module 103 continues having there is the view field changing compare.If both have relatively approached or have overlapped, so just reach the object of color correction, just can finish this color correction process; Otherwise, also need to proceed color correction.If those skilled in the art can determine that set point has relatively high expectations according to actual conditions, set point can arrange less; If require lowlyer, set point can arrange larger.Certainly, also set point can be made as to 0, represent situation about overlapping completely.This set point also can arrange identical with above-mentioned setpoint distance value, or less than above-mentioned setpoint distance value.
By repeating step S402-S405, make the chromaticity coordinates T point of background colour of view field and the chromaticity coordinates W point of object color component more and more approaching, until reach requirement, thus reach the object of color correction.
Conventionally, the chromaticity coordinates W point of object color component is positioned at the triangle of R, G, B point formation.Straight line RW, GW, BW cross respectively straight line BG, BR, GR in a P, N, M, and triangle RGB is divided into multiple little triangles.
In form as shown in table 1, list T point and laid respectively in different little leg-of-mutton situations, determined the method for primary colours to be adjusted.For example, be positioned at the situation of little triangle RWM for T point, determine and first increase G luminance primary, determine that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of; The brightness adjustment value of the primary colours G primary colours to be adjusted that repeatedly send according to correction module through projection module, gradually the G primary colours of projection light source are adjusted brighter and brighter, make the background colour coordinate of the view field in the photographic images of taking module current shooting more and more near BW straight line (or BW extended line).When the background colour coordinate of the view field in the photographic images of taking module current shooting, be that T point overlaps or is less than Second Threshold with BW straight line (or BW extended line), determine and increase B luminance primary, determine that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of.
Table 1
| Triangle of living in | The first step increases luminance primary | Second step increases luminance primary |
| GWM | R | B |
| GWP | B | R |
| RWM | G | B |
| RWN | B | G |
| BWP | G | R |
| BWN | R | G |
The mode of the definite primary colours to be adjusted shown in above-mentioned table 1 specifically describes as follows:
If T point is positioned at little triangle GWM or BWN, determine primary colours to be adjusted be R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point is positioned at little triangle GWP or RWN, determine primary colours to be adjusted be B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point is positioned at little triangle RWM or BWP, determine primary colours to be adjusted be G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
If T point overlaps with BW extended line or is less than Second Threshold, determine that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point overlaps with RW extended line or is less than Second Threshold, determine that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point overlaps with GW extended line or is less than Second Threshold, determine that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of.
Those skilled in the art can be set to identical value with Second Threshold according to the above-mentioned first threshold of actual conditions.
At step S406, finish this color correction.Correction module 103 no longer sends the brightness adjustment value of primary colours to projection module 102, projection module 102 will maintain the current luminance primary of projection light source.
Because the projecting apparatus of the embodiment of the present invention can be realized color correction, making the application scenario of projecting apparatus be not limited to display screen is white occasion.For the display screen of other color, as ecru etc., can pass through color adjustment, and make the image effect that projects and to project to effect on white displays screen identical, projecting apparatus is used more convenient.
The projecting apparatus of the embodiment of the present invention is owing to adopting photographing module to take the view field on display screen, analyze the background colour of view field, according to the background colour of the view field analyzing and object color component, adjust the three primary colors brightness of projector light source, reach the object of color correction, there is lower hardware cost and photographing module is general camera; And, according to the background colour of the view field analyzing and object color component, in the process of the three primary colors brightness of adjustment projector light source, do not need to adopt matrix computations, therefore save memory and the required calculation process resource expending of matrix operation process for storage matrix, thereby greatly saved system resource.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a method for correcting colors of projected image, comprises the steps:
A, view field projecting apparatus being projected on display screen by photographing module take, and obtain photographic images;
B, by correction module according to the background colour of the view field in the current photographic images obtaining of described photographing module the distance relation between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module;
C, by projection module according to the brightness adjustment value of primary colours to be adjusted receiving, adjust the brightness of the corresponding primary colours of light source;
D, continued to obtain the photographic images of described photographing module current shooting by correction module, and when the chromaticity coordinates in hue coordinate system is less than set point with the relative distance between the chromaticity coordinates of object color component in hue coordinate system at the background colour of determining the view field in the current photographic images obtaining of described photographing module, finish this time correction; Otherwise, repeating step B, C, D.
2. the method for claim 1, after described steps A, also comprises:
By authentication module, view field in described photographic images is carried out to cross-color judgement, and cross-color judged result is sent to described correction module; And,
By correction module according to the background colour of the view field in the current photographic images obtaining of described photographing module the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system, determine that primary colours to be adjusted comprise: described correction module is after definite described cross-color judged result is distortion, relative position between chromaticity coordinates according to the background colour of the view field in the current photographic images obtaining of described photographing module in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system, determines primary colours to be adjusted.
3. method as claimed in claim 2, described authentication module carries out cross-color judgement to view field in described photographic images and comprises:
If the distance between chromaticity coordinates and the chromaticity coordinates of object color component in hue coordinate system of the background colour of the view field in the definite current photographic images obtaining of described photographing module of described authentication module in hue coordinate system exceedes setpoint distance value, determine that described cross-color judged result is distortion; Otherwise, determine that described cross-color judged result is undistorted.
4. method as claimed in claim 3, described correction module is the distance relation between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of described photographing module, determines that primary colours to be adjusted comprise:
From determining the straight line nearest with T point among straight line RW, GW, BW, in the time that T point and this distance are greater than first threshold, make T point to this nearest rectilinear movement, these primary colours are primary colours to be adjusted;
If the distance between T point and this nearest straight line is less than first threshold or coincides, determine corresponding primary colours to be adjusted according to the position relationship between W point and T point, make T point mobile to W point to the direction of this nearest straight line, these primary colours are primary colours to be adjusted;
Or, if T point is positioned at little triangle GWM or BWN, determine primary colours to be adjusted be R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point is positioned at little triangle GWP or RWN, determine primary colours to be adjusted be B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point is positioned at little triangle RWM or BWP, determine primary colours to be adjusted be G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
If T point overlaps with BW extended line or is less than Second Threshold, determine that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point overlaps with RW extended line or is less than Second Threshold, determine that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point overlaps with GW extended line or is less than Second Threshold, determine that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
Wherein, the chromaticity coordinates of three primary light source is respectively R, G, B point in described hue coordinate is, the chromaticity coordinates of object color component is W point in hue coordinate system, and the chromaticity coordinates of the background colour of the view field in the current photographic images obtaining of described photographing module is T point in hue coordinate system; Straight line RW, GW, BW cross respectively straight line BG, BR, GR in a P, N, M, and triangle RGB is divided into GWM, BWN, GWP, RWN, the little triangle of RWM, BWP.
5. method as claimed in claim 4, the nearest straight line that described basis is determined determines that corresponding primary colours to be adjusted comprise:
If T point and the nearest straight line of determining coincide, or distance between T point and the nearest straight line determined is less than first threshold, determines corresponding primary colours to be adjusted according to the position relationship between W point and T point.
6. a projecting apparatus, comprising:
Photographing module, takes for the view field that projecting apparatus is projected on display screen, obtains photographic images;
Correction module, for the distance relation between the chromaticity coordinates in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system according to the background colour of the view field of the current photographic images obtaining of described photographing module, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module;
Projection module, for according to the brightness adjustment value of the primary colours to be adjusted that receive, adjusts the brightness of the corresponding primary colours of light source;
Described correction module is also for continuing to obtain the photographic images of described photographing module current shooting, and when the chromaticity coordinates in hue coordinate system is less than set point with the relative distance between the chromaticity coordinates of object color component in hue coordinate system at the background colour of determining the view field in the current photographic images obtaining of described photographing module, finish this time correction; Otherwise, continue the relative position between the chromaticity coordinates in hue coordinate system and the chromaticity coordinates of object color component in hue coordinate system according to the background colour of the view field in the current photographic images obtaining of described photographing module, determine primary colours to be adjusted, and the brightness adjustment value of these primary colours to be adjusted is sent to projection module.
7. projecting apparatus as claimed in claim 6, is characterized in that, also comprises:
Authentication module, for described photographic images view field is carried out to cross-color judgement, and sends to described correction module by cross-color judged result; And,
Described correction module is also for after being distortion in definite described cross-color judged result, relative position between chromaticity coordinates according to the background colour of the view field in the current photographic images obtaining of described photographing module in hue coordinate system and the object color component chromaticity coordinates in hue coordinate system, determines primary colours to be adjusted.
8. projecting apparatus as claimed in claim 7, it is characterized in that, described authentication module comprises for described photographic images view field being carried out to cross-color judgement: the chromaticity coordinates of the background colour of determining the view field in the current photographic images obtaining of described photographing module in hue coordinate system, with the distance of object color component between the chromaticity coordinates in hue coordinate system exceed setpoint distance value, determine that described cross-color judged result is distortion; Otherwise, determine that described cross-color judged result is undistorted.
9. the projecting apparatus as described in as arbitrary in claim 6-8, is characterized in that, described correction module determines that primary colours to be adjusted comprise:
From determining the straight line nearest with T point among straight line RW, GW, BW, in the time that T point and this distance are greater than first threshold, make T point to this nearest rectilinear movement, these primary colours are primary colours to be adjusted;
If the distance between T point and this nearest straight line is less than first threshold or coincides, determine corresponding primary colours to be adjusted according to the position relationship between W point and T point, make T point mobile to W point to the direction of this nearest straight line, these primary colours are primary colours to be adjusted;
Or if T point is positioned at little triangle GWM or BWN, described correction module determines that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point is positioned at little triangle GWP or RWN, described correction module determines that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point is positioned at little triangle RWM or BWP, described correction module determines that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of;
If T point overlaps with BW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are B primary colours, and the brightness adjustment value of B primary colours be on the occasion of;
If T point overlaps with RW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are R primary colours, and the brightness adjustment value of R primary colours be on the occasion of;
If T point overlaps with GW extended line or is less than Second Threshold, described correction module determines that primary colours to be adjusted are G primary colours, and the brightness adjustment value of G primary colours be on the occasion of,
Wherein, the chromaticity coordinates of three primary light source is respectively R, G, B point in described hue coordinate is, the chromaticity coordinates of described object color component is W point in hue coordinate system, and the chromaticity coordinates of the background colour of the view field in the current photographic images obtaining of described photographing module is T point in hue coordinate system; Straight line RW, GW, BW cross respectively straight line BG, BR, GR in a P, N, M, and triangle RGB is divided into GWM, BWN, GWP, RWN, the little triangle of RWM, BWP.
10. projecting apparatus as claimed in claim 9, is characterized in that,
Described correction module is determined the straight line nearest with T point among straight line RW, GW, BW, determines that according to the nearest straight line of determining corresponding primary colours to be adjusted comprise:
If described correction module is determined T point and described nearest straight line coincides, or distance between T point and described nearest straight line is less than first threshold, determines corresponding primary colours to be adjusted according to the position relationship between W point and T point.
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