CN104536249A - Method and device for regulating focal length of projector - Google Patents

Method and device for regulating focal length of projector Download PDF

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Publication number
CN104536249A
CN104536249A CN201510023687.5A CN201510023687A CN104536249A CN 104536249 A CN104536249 A CN 104536249A CN 201510023687 A CN201510023687 A CN 201510023687A CN 104536249 A CN104536249 A CN 104536249A
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China
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focal length
sharpness
projector
value
current projection
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CN201510023687.5A
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Chinese (zh)
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CN104536249B (en
Inventor
魏强
里强
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深圳市中兴移动通信有限公司
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Publication of CN104536249A publication Critical patent/CN104536249A/en
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Publication of CN104536249B publication Critical patent/CN104536249B/en

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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/53Means for automatic focusing, e.g. to compensate thermal effects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/317Convergence or focusing systems

Abstract

The invention discloses a method and device for regulating the focal length of a projector. The method comprises the following steps of acquiring the current projecting distance, or acquiring at least two groups of corresponding values of focal length and definition at the current projecting distance; selecting a corresponding relation between the focal distance and the definition, which is most matched with the current projecting distance, from the plurality of pre-stored corresponding relations between the focal length and the definition at the projecting distance according to the corresponding value of the current projecting distance or the focal length and the definition; acquiring the optimal focal length corresponding to the maximum definition at the current projecting distance according to the corresponding relation between the focal length and the definition which are most matched with the current projecting distance; and regulating the focal length of the projector to the optimal focal length to obtain a clear projected image. Therefore, the automatic regulation of the focal length of the projector is realized, the projector is more intelligent and humanized, the operation of manually regulating by a user is not needed, the user experience is improved, and the efficiency is increased.

Description

Regulate the method and apparatus of projector focal length

Technical field

The present invention relates to porjector technology field, especially relate to a kind of method and apparatus regulating projector focal length.

Background technology

Projector has been widely used in teaching, office and sphere of life, and developing rapidly particularly along with mobile terminal, a lot of mobile terminal is also equipped with projector, brings great convenience and enjoyment to the work of people and life.When using projector, in order to make projected image that projection screen shows clear, need the focal length regulating projector, and usually need user to carry out manual adjustments at present, adjustment process is more loaded down with trivial details time-consuming.Particularly for mobile terminal, during each use, projector distance is all different, and the pinpointed focus difference that different projector distances is corresponding, therefore user uses projector will experience loaded down with trivial details focus adjustment process at every turn, wastes time and energy, and Consumer's Experience is not good.

Summary of the invention

Fundamental purpose of the present invention is to provide a kind of method and apparatus regulating projector focal length, is intended to the automatic adjustment realizing projector focal length, raises the efficiency, and promotes Consumer's Experience.

To achieve these objectives, the present invention proposes a kind of method regulating projector focal length, comprises step:

Obtain current projector distance, or obtain Current projection apart under at least two group focal length-sharpness respective value;

According to described current projector distance or focal length-sharpness respective value, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance;

According to the corresponding relation of the described focal length that distance is mated most with Current projection with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness;

Regulate the focal length of projector to described pinpointed focus.

Preferably, described acquisition Current projection apart under at least two group focal length-sharpness respective value comprise:

Project under Current projection distance;

Acquired projections image, obtains the sharpness of described projected image and current focal length, obtains one group of focal length-sharpness respective value;

Automatically focus, repeat previous step, obtain another group focal length-sharpness respective value, final acquisition at least two group focal length-sharpness respective value.

Preferably, described focal length with the corresponding relation of sharpness is: the function expression of focal length and sharpness, function curve diagram or corresponding form.

Preferably, the corresponding relation of described focal length and sharpness is the function curve diagram of focal length and sharpness; Described according to described focal length-sharpness respective value, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance, comprising:

Using described focal length-sharpness respective value as coordinate figure, and the coordinate points corresponding to described coordinate figure is marked in the coordinate system at function curve diagram place of described focal length and sharpness;

The function curve diagram the highest with described coordinate points registration is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness from the function curve diagram of described focal length and sharpness.

Preferably, the focal length mated most with Current projection distance described in described basis and the corresponding relation of sharpness, obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, comprising:

The coordinate figure on the summit of the focal length mated most with Current projection distance described in obtaining and the function curve diagram of sharpness, using the ordinate in described coordinate figure as Current projection apart under utmost sharpness, using the horizontal ordinate in described coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.

The present invention proposes a kind of device regulating projector focal length simultaneously, comprises acquisition module, processing module and adjustment module, wherein:

Acquisition module, for obtaining current projector distance, or obtain Current projection apart under at least two group focal length-sharpness respective value;

Processing module, for according to described Current projection distance or focal length-sharpness respective value, from the focal length the multiple projector distances prestored with the corresponding relation of sharpness, selects and the corresponding relation of Current projection apart from the focal length mated most and sharpness; According to the corresponding relation of the described focal length that distance is mated most with Current projection with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness;

Adjustment module, for regulating the focal length of projector to described pinpointed focus.

Preferably, described acquisition module is used for: gather Current projection apart under projected image, obtain the sharpness of described projected image and current focal length, obtain one group of focal length-sharpness respective value; Control described adjustment module automatically to focus, obtain another group focal length-sharpness respective value, final acquisition at least two group focal length-sharpness respective value.

Preferably, described focal length with the corresponding relation of sharpness is: the function expression of focal length and sharpness, function curve diagram or corresponding form.

Preferably, the corresponding relation of described focal length and sharpness is the function curve diagram of focal length and sharpness, described processing module is used for: using described focal length-sharpness respective value as coordinate figure, and is marked in the coordinate system at function curve diagram place of described focal length and sharpness by the coordinate points corresponding to described coordinate figure; The function curve diagram the highest with described coordinate points registration is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness from the function curve diagram of described focal length and sharpness.

Preferably, described processing module is used for: the coordinate figure on the summit of the focal length mated most with Current projection distance described in obtaining and the function curve diagram of sharpness, using the ordinate in described coordinate figure as Current projection apart under utmost sharpness, using the horizontal ordinate in described coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.

A kind of method regulating projector focal length provided by the present invention, by the corresponding relation of the focal length under multiple projector distance that prestores and sharpness, after projector starts, first obtain current projector distance or obtain Current projection apart under at least two group focal length-sharpness respective value, then from corresponding relation, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance, and then obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, finally automatically focus to pinpointed focus, obtain projected image clearly.Achieve the automatic adjustment of projector focal length, make the more intelligent and hommization of projector, user, without the need to manual adjustments, improves Consumer's Experience, improves efficiency.

Accompanying drawing explanation

Fig. 1 is the process flow diagram that the present invention regulates method first embodiment of projector focal length;

Fig. 2 is the function curve diagram of focal length under a certain projector distance and sharpness;

Fig. 3 is the function curve diagram of focal length under certain two projector distance and sharpness;

Fig. 4 is the schematic diagram of the function curve diagram choosing focal length and the sharpness of mating most with Current projection distance in the embodiment of the present invention;

Fig. 5 is the process flow diagram that the present invention regulates method second embodiment of projector focal length;

Fig. 6 is the process flow diagram that the present invention regulates device first embodiment of projector focal length.

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.

Embodiment

Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

See Fig. 1, propose method first embodiment that the present invention regulates projector focal length, said method comprising the steps of:

Step S10: obtain at least two group focal length-sharpness respective value under Current projection distance

Concrete, after projector (can be the projector module in special projection device or mobile terminal) starts, first project, automatically to carry out focal length rectification under Current projection distance.Acquired projections, to the projected image on screen, obtains the sharpness of this projected image, and obtains current focal length, obtains one group of focal length-sharpness respective value; Automatically focus, again project with the focal length after regulating, repeat previous step, obtain another group focal length-sharpness respective value in an identical manner, by that analogy, can obtain and organize focal length-sharpness respective value more, minimumly be no less than two groups, The more the better in theory.Described focal length-sharpness respective value comprises focal length value and the definition values corresponding with this focal length value.The sharpness of projected image can be calculated by definition algorithm of the prior art and obtain, and is not repeated herein.

Step S11: according to the focal length-sharpness respective value obtained, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, selects and the corresponding relation of Current projection apart from the focal length mated most and sharpness

Focal length under the multiple projector distances prestored and the corresponding relation of sharpness, can be stored in this locality, also can be stored in high in the clouds, and in theory, the corresponding relation of storage is The more the better.Focal length under multiple projector distance and the corresponding relation of sharpness can be the corresponding relations of the corresponding focal length of a projector distance value and sharpness, also can be the corresponding relations of the corresponding focal length of a projector distance scope and sharpness.Described focal length and the corresponding relation of sharpness comprise the function expression, function curve diagram, corresponding form etc. of focal length and sharpness.

Be described in detail for function curve diagram below.

When projector carries out screen prjection, regulate projector focal length, projected image can convert between fuzzy and clear.When being adjusted to long-focus from short focus gradually or being adjusted to short focus gradually from long-focus, projected image is by the change procedure of experience from fuzzy to clear, again from clear to fuzzy, and this change procedure can represent with the function curve in Fig. 2.Wherein, in Fig. 2, transverse axis represents the focal length of projector, and the longitudinal axis represents the sharpness of projected image, and function curve represents under certain projector distance, regulates the focal length of projector, the sharpness situation of change of projected image.Can find out in figure, the change that the sharpness of projected image occurs along with the change of projector focal length, hump represents that the sharpness of projected image reaches the highest, and abscissa value that this point is corresponding represents the pinpointed focus of Current projection apart from lower projector.

But when same projector projects under different projector distances, the pinpointed focus of its correspondence is different.As shown in Figure 3, two focal lengths corresponding under two projector distances and the function curve diagram of sharpness is shown.So, for same projector, the function curve diagram of sharpness under multiple projector distance and focal length can be measured, thus form the corresponding relation database of a focal length and sharpness.In order to make the sharpness that obtains enough accurate, projector can be allowed to use same piece image all the time to measure, such as use the LOGO image of producer, another benefit done like this starts in the process of display LOGO at projector, and focal length is just adjusted automatically.In fact, the projector distance scope that projector has oneself to support, when prior measurement relation curve, only needs to measure its projector distance scope supported, can reduce the workload of measurement like this.Namely prestored within the scope of the projector distance of the machine support in the present embodiment, focal length under multiple projector distance and the function curve diagram of sharpness, form the corresponding relation database of a focal length and sharpness, this database can be positioned at this locality, also can be positioned at high in the clouds.

When obtain Current projection apart under focal length-sharpness respective value after, then using focal length-sharpness respective value as coordinate figure, wherein using focal length value as abscissa value, definition values as ordinate value, and the coordinate points corresponding to this coordinate figure to be marked in the coordinate system at function curve diagram place of focal length and the sharpness prestored.Then, from the function curve diagram of focal length and sharpness, the function curve diagram the highest with all coordinate points registrations marked is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness.In other words, when all acquisitions focal length-sharpness respective value corresponding to coordinate points fall into the function curve diagram of which focal length and sharpness, or during function curve diagram near which focal length and sharpness, then using the function curve diagram of this function curve diagram as the focal length mated most with Current projection distance and sharpness.

Such as, as shown in Figure 4, the focal length prestored and the function curve diagram of sharpness comprise the function curve diagram under two projector distances, are respectively function curve diagram A and B.Obtain three focal lengths-sharpness respective value, respectively corresponding three coordinate points i, j, k, these three coordinate points all fall into function curve diagram A, then using the function curve diagram of function curve diagram A as the focal length mated most with Current projection distance and sharpness.

In certain embodiments, the corresponding relation of focal length and sharpness also can be the function expression of focal length and sharpness, and the focal length under multiple projector distance that prestored in database and the function expression of sharpness, as this function expression is wherein f (x) represents sharpness, and x represents focal length, and a, b, c are constant and a>0, and under different projector distance, a, b, c are different.When after acquisition focal length-sharpness respective value, focal length value in focal length-sharpness respective value is substituted in each function expression prestored as f (x) as x, definition values, therefrom selects both sides equation equal or closest to the equal function expression function expression as the focal length mated most with Current projection distance and sharpness.Or, after acquisition three groups of focal lengths-sharpness respective value, respectively three groups of focal lengths-sharpness respective value is substituted into function expression in, directly try to achieve a, b, c value, a, b, c value of trying to achieve is substituted into function expression middle as the function expression with the Current projection focal length that mates most of distance and sharpness.

In further embodiments, focal length and the corresponding relation of sharpness also can be focal lengths and the corresponding form of sharpness, the corresponding form of the focal length prestored in database under multiple projector distance and sharpness, the corresponding focal length value (or value range) of each definition values (or value range) in corresponding form.When after acquisition focal length-sharpness respective value, all focal length-sharpness respective value the forms corresponding to each obtained are contrasted, therefrom select with all focal lengths-sharpness respective value completely corresponding or immediate corresponding form as with Current projection apart from the corresponding form of the focal length mated most with sharpness.

Step S12: according to the corresponding relation of the focal length that mates most of Current projection distance with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness

Concrete, when being the function curve diagram of focal length and sharpness with the corresponding relation of the Current projection focal length that mates most of distance and sharpness, obtain the coordinate figure on the summit of this function curve diagram, using the ordinate in apex coordinate value as Current projection apart under utmost sharpness, using the horizontal ordinate in coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.

When being the function expression of focal length and sharpness with the corresponding relation of the Current projection focal length that mates most of distance and sharpness, with Gaussian function for example, the apex coordinate of its correspondence be (b, a), wherein a be Current projection apart under utmost sharpness, b is for Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness.

When being the corresponding form of focal length with sharpness with the corresponding relation of the Current projection focal length that mates most of distance and sharpness, from this form, find out value of maximum articulation, using the focal length value corresponding to this value of maximum articulation as Current projection apart under pinpointed focus.

Should be appreciated that pinpointed focus of the present invention, is a relative concept, and nisi pinpointed focus, can not therefore limit protection scope of the present invention.

Step S13: regulate the focal length of projector to pinpointed focus

Thus, the method of the adjustment projector focal length of the present embodiment, by the corresponding relation of the focal length under multiple projector distance that prestores and sharpness, after projector starts, first obtain Current projection apart under at least two group focal length-sharpness respective value, then the corresponding relation of focal length and the sharpness of mating most with Current projection distance is obtained according to respective value and corresponding relation, and then obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, finally automatically focus to pinpointed focus, obtain projected image clearly.Achieve the automatic adjustment of projector focal length, make the more intelligent and hommization of projector, user, without the need to manual adjustments, improves Consumer's Experience, improves efficiency.

See Fig. 5, propose method second embodiment that the present invention regulates projector focal length, said method comprising the steps of:

Step S20: obtain current projector distance

After projector starts, obtained the distance of projector and projection screen by distance detection device (as infrared range-measurement system), this distance and current projector distance.

Step S21: according to current projector distance, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, selects the corresponding relation of focal length and the sharpness of mating most with Current projection distance

Focal length under the multiple projector distances prestored and the corresponding relation of sharpness, can be stored in this locality, also can be stored in high in the clouds.Focal length and the corresponding relation of sharpness comprise the function expression, function curve diagram, corresponding form etc. of focal length and sharpness.Focal length under multiple projector distance and the corresponding relation of sharpness can be the corresponding relations of the corresponding focal length of a projector distance value and sharpness, also can be the corresponding relations of the corresponding focal length of a projector distance scope and sharpness.

Judge that current projector distance value is equal with which distance value prestored, or it is closest with which distance value prestored, or in which distance range prestored, then using this apart under the corresponding relation of focal length and sharpness as the corresponding relation of the focal length mated most with Current projection distance and sharpness.

Step S22: according to the corresponding relation of the focal length that mates most of Current projection distance with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness

This step S22 is identical with the step S12 in the first embodiment, does not repeat them here.

Step S23: regulate the focal length of projector to pinpointed focus

Thus, the method of the adjustment projector focal length of the present embodiment, by the corresponding relation of the focal length under multiple projector distance that prestores and sharpness, after projector starts, first obtain current projector distance, from corresponding relation, then select the corresponding relation of focal length and the sharpness of mating most with Current projection distance, and then obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, finally automatically focus to pinpointed focus, obtain projected image clearly.Achieve the automatic adjustment of projector focal length, make the more intelligent and hommization of projector, user, without the need to manual adjustments, improves Consumer's Experience, improves efficiency.

See Fig. 6, propose device one embodiment that the present invention regulates projector focal length, the device of described adjustment projector focal length can be applied to special projection device or have in the mobile terminal of projecting function.The device of described adjustment projector focal length comprises acquisition module, processing module and adjustment module.

Acquisition module: for obtain Current projection apart under at least two group focal length-sharpness respective value, and send to processing module.

Concrete, after projector starts, first project under Current projection distance, acquisition module acquired projections, to the projected image on screen, obtains the sharpness of this projected image, and obtains current focal length, obtains one group of focal length-sharpness respective value; Then regulating and controlling module is focused automatically, projector projects again with the focal length after adjustment, and acquisition module obtains another group focal length-sharpness respective value in an identical manner, by that analogy, can obtain and organize focal length-sharpness respective value more, minimumly be no less than two groups.Described focal length-sharpness respective value comprises focal length value and the definition values corresponding with this focal length value.

Processing module: for according to Current projection distance or focal length-sharpness respective value, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, selects and the corresponding relation of Current projection apart from the focal length mated most and sharpness; Then according to and the corresponding relation of the focal length that mates most of Current projection distance and sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness.And pinpointed focus is sent to adjustment module.

Focal length under the multiple projector distances prestored and the corresponding relation of sharpness, can be stored in this locality, also can be stored in high in the clouds.Focal length under multiple projector distance and the corresponding relation of sharpness can be the corresponding relations of the corresponding focal length of a projector distance value and sharpness, also can be the corresponding relations of the corresponding focal length of a projector distance scope and sharpness.

Focal length and the corresponding relation of sharpness comprise the function expression, function curve diagram, corresponding form etc. of focal length and sharpness.

For example, for the corresponding relation of focal length and sharpness for function curve diagram.When projector carries out screen prjection, regulate projector focal length, projected image can convert between fuzzy and clear.When being adjusted to long-focus from short focus gradually or being adjusted to short focus gradually from long-focus, projected image is by the change procedure of experience from fuzzy to clear, again from clear to fuzzy, and this change procedure can represent with the function curve in Fig. 2.Wherein, in Fig. 2, transverse axis represents the focal length of projector, and the longitudinal axis represents the sharpness of projected image, and function curve represents under certain projector distance, regulates the focal length of projector, the sharpness situation of change of projected image.Can find out in figure, the change that the sharpness of projected image occurs along with the change of projector focal length, hump represents that the sharpness of projected image reaches the highest, and abscissa value that this point is corresponding represents the pinpointed focus of Current projection apart from lower projector.

But when same projector projects under different projector distances, the pinpointed focus of its correspondence is different.As shown in Figure 3, two focal lengths corresponding under two projector distances and the function curve diagram of sharpness is shown.So, for same projector, the function curve diagram of sharpness under multiple projector distance and focal length can be measured, thus form the corresponding relation database of a focal length and sharpness.In order to make the sharpness that obtains enough accurate, projector can be allowed to use same piece image all the time to measure, such as use the LOGO image of producer, another benefit done like this starts in the process of display LOGO at projector, and focal length is just adjusted automatically.In fact, the projector distance scope that projector has oneself to support, when prior measurement relation curve, only needs to measure its projector distance scope supported, can reduce the workload of measurement like this.Thus can prestore within the scope of the projector distance of projector support, the focal length under multiple projector distance and the function curve diagram of sharpness, form the corresponding relation database of a focal length and sharpness, this database can be positioned at this locality, also can be positioned at high in the clouds.

When obtain Current projection apart under focal length-sharpness respective value after, acquisition module then using focal length-sharpness respective value as coordinate figure, wherein using focal length value as abscissa value, definition values as ordinate value, and the coordinate points corresponding to this coordinate figure to be marked in the coordinate system at function curve diagram place of focal length and the sharpness prestored.Then, from the function curve diagram of focal length and sharpness, the function curve diagram the highest with all coordinate points registrations marked is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness.In other words, the coordinate points corresponding to focal length-sharpness respective value that processing module analyzes all acquisitions fall into the function curve diagram of which focal length and sharpness, or near the function curve diagram of which focal length and sharpness, then using the function curve diagram of this function curve diagram as the focal length mated most with Current projection distance and sharpness.

Such as, as shown in Figure 4, the focal length prestored and the function curve diagram of sharpness comprise the function curve diagram under two projector distances, are respectively function curve diagram A and B.Obtain three focal lengths-sharpness respective value, corresponding three coordinate points i, j, k respectively, these three coordinate points all fall into function curve diagram A, processing module then using function curve diagram A as the function curve diagram with the Current projection focal length that mates most of distance and sharpness.

After selecting the function curve diagram of focal length and the sharpness of mating most with Current projection distance, processing module then obtains the coordinate figure on the summit of this function curve diagram, using the ordinate in apex coordinate value as Current projection apart under utmost sharpness, using the horizontal ordinate in coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.

For the function expression that the corresponding relation of focal length and sharpness is focal length and sharpness.The function expression of focal length under multiple projector distance and the sharpness of having prestored in database, as this function expression is wherein f (x) represents sharpness, and x represents focal length, and a, b, c are constant and a>0, and under different projector distance, a, b, c are different.When after acquisition focal length-sharpness respective value, focal length value in focal length-sharpness respective value then substitutes in each function expression prestored as x, definition values as f (x) by processing module, therefrom selects both sides equation equal or closest to the equal function expression function expression as the focal length mated most with Current projection distance and sharpness.Or, after acquisition three groups of focal lengths-sharpness respective value, respectively three groups of focal lengths-sharpness respective value is substituted into function expression in, directly try to achieve a, b, c value, a, b, c value of trying to achieve is substituted into function expression middle as the function expression with the Current projection focal length that mates most of distance and sharpness.

After selecting or obtain the function expression of focal length and the sharpness of mating most with Current projection distance, processing module then obtains the apex coordinate of the function curve diagram corresponding to this function expression, this apex coordinate is (b, a), wherein a be Current projection apart under utmost sharpness, b is for Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness.

For the corresponding relation of focal length and sharpness for focal length and the corresponding form of sharpness.The corresponding form of the focal length prestored in database under multiple projector distance and sharpness, the corresponding focal length value (or value range) of each definition values (or value range) in corresponding form.When after acquisition focal length-sharpness respective value, all focal length-sharpness respective value the forms corresponding to each obtained contrast by processing module, therefrom select with all focal lengths-sharpness respective value completely corresponding or immediate corresponding form as with Current projection apart from the corresponding form of the focal length mated most with sharpness.Select with after the focal length that mates most of Current projection distance and the corresponding form of sharpness, processing module then finds out value of maximum articulation from this form, using the focal length value corresponding to this value of maximum articulation as Current projection apart under pinpointed focus.

Adjustment module: for automatically regulating the focal length of projector, after receiving pinpointed focus, regulates the focal length of projector to pinpointed focus.

In certain embodiments, after projector starts, acquisition module obtains the distance of projector and projection screen by distance detection device (as infrared range-measurement system), this distance and current projector distance, and current projector distance is sent to processing module.Processing module then judges that current projector distance value is equal with which distance value prestored, or it is closest with which distance value prestored, or in which distance range prestored, then using this apart under the corresponding relation of focal length and sharpness as the corresponding relation of the focal length mated most with Current projection distance and sharpness.

The device of adjustment projector focal length of the present invention, by the corresponding relation of the focal length under multiple projector distance that prestores and sharpness, after projector starts, first obtain current projector distance or obtain Current projection apart under at least two group focal length-sharpness respective value, then from corresponding relation, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance, and then obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, finally automatically focus to pinpointed focus, obtain projected image clearly.Achieve the automatic adjustment of projector focal length, make the more intelligent and hommization of projector, user, without the need to manual adjustments, improves Consumer's Experience, improves efficiency.

It should be noted that: the device of the adjustment projector focal length that above-described embodiment provides is when regulating projector focal length, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules.In addition, the device of the adjustment projector focal length that above-described embodiment provides belongs to same design with regulating the embodiment of the method for projector focal length, its specific implementation process refers to embodiment of the method, and the technical characteristic in embodiment of the method is all corresponding applicable in device embodiment, repeats no more here.

One of ordinary skill in the art will appreciate that, realize the hardware that all or part of step in above-described embodiment method can control to be correlated with by program to complete, described program can be stored in a computer read/write memory medium, and described storage medium can be ROM/RAM, disk, CD etc.

Should be understood that; these are only the preferred embodiments of the present invention; can not therefore limit the scope of the claims of the present invention; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (10)

1. regulate a method for projector focal length, it is characterized in that, comprise step:
Obtain current projector distance, or obtain Current projection apart under at least two group focal length-sharpness respective value;
According to described current projector distance or focal length-sharpness respective value, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance;
According to the corresponding relation of the described focal length that distance is mated most with Current projection with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness;
Regulate the focal length of projector to described pinpointed focus.
2. the method for adjustment projector focal length according to claim 1, is characterized in that, described acquisition Current projection apart under at least two group focal length-sharpness respective value comprise:
Project under Current projection distance;
Acquired projections image, obtains the sharpness of described projected image and current focal length, obtains one group of focal length-sharpness respective value;
Automatically focus, repeat previous step, obtain another group focal length-sharpness respective value, final acquisition at least two group focal length-sharpness respective value.
3. the method for adjustment projector focal length according to claim 1 and 2, is characterized in that, described focal length with the corresponding relation of sharpness is: the function expression of focal length and sharpness, function curve diagram or corresponding form.
4. the method for adjustment projector focal length according to claim 1 and 2, is characterized in that, the corresponding relation of described focal length and sharpness is the function curve diagram of focal length and sharpness; Described according to described focal length-sharpness respective value, from the corresponding relation of the focal length the multiple projector distances prestored and sharpness, select the corresponding relation of focal length and the sharpness of mating most with Current projection distance, comprising:
Using described focal length-sharpness respective value as coordinate figure, and the coordinate points corresponding to described coordinate figure is marked in the coordinate system at function curve diagram place of described focal length and sharpness;
The function curve diagram the highest with described coordinate points registration is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness from the function curve diagram of described focal length and sharpness.
5. the method for adjustment projector focal length according to claim 4, it is characterized in that, the focal length mated most with Current projection distance described in described basis and the corresponding relation of sharpness, obtain Current projection apart from the pinpointed focus corresponding to lower utmost sharpness, comprising:
The coordinate figure on the summit of the focal length mated most with Current projection distance described in obtaining and the function curve diagram of sharpness, using the ordinate in described coordinate figure as Current projection apart under utmost sharpness, using the horizontal ordinate in described coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.
6. regulate a device for projector focal length, it is characterized in that, comprise acquisition module, processing module and adjustment module, wherein:
Acquisition module, for obtaining current projector distance, or obtain Current projection apart under at least two group focal length-sharpness respective value;
Processing module, for according to described Current projection distance or focal length-sharpness respective value, from the focal length the multiple projector distances prestored with the corresponding relation of sharpness, selects and the corresponding relation of Current projection apart from the focal length mated most and sharpness; According to the corresponding relation of the described focal length that distance is mated most with Current projection with sharpness, acquisition Current projection is apart from the pinpointed focus corresponding to lower utmost sharpness;
Adjustment module, for regulating the focal length of projector to described pinpointed focus.
7. the device of adjustment projector focal length according to claim 6, it is characterized in that, described acquisition module is used for: gather Current projection apart under projected image, obtain the sharpness of described projected image and current focal length, obtain one group of focal length-sharpness respective value; Control described adjustment module automatically to focus, obtain another group focal length-sharpness respective value, final acquisition at least two group focal length-sharpness respective value.
8. the device of the adjustment projector focal length according to claim 6 or 7, is characterized in that, described focal length with the corresponding relation of sharpness is: the function expression of focal length and sharpness, function curve diagram or corresponding form.
9. the device of the adjustment projector focal length according to claim 6 or 7, it is characterized in that, the corresponding relation of described focal length and sharpness is the function curve diagram of focal length and sharpness, described processing module is used for: using described focal length-sharpness respective value as coordinate figure, and is marked in the coordinate system at function curve diagram place of described focal length and sharpness by the coordinate points corresponding to described coordinate figure; The function curve diagram the highest with described coordinate points registration is selected, as the function curve diagram of the focal length mated most with Current projection distance and sharpness from the function curve diagram of described focal length and sharpness.
10. the device of adjustment projector focal length according to claim 9, it is characterized in that, described processing module is used for: the coordinate figure on the summit of the focal length mated most with Current projection distance described in obtaining and the function curve diagram of sharpness, using the ordinate in described coordinate figure as Current projection apart under utmost sharpness, using the horizontal ordinate in described coordinate figure as Current projection apart from the pinpointed focus corresponding to lower utmost sharpness.
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