CN100589526C - Image picking system and method thereof - Google Patents
Image picking system and method thereof Download PDFInfo
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- CN100589526C CN100589526C CN200710004019A CN200710004019A CN100589526C CN 100589526 C CN100589526 C CN 100589526C CN 200710004019 A CN200710004019 A CN 200710004019A CN 200710004019 A CN200710004019 A CN 200710004019A CN 100589526 C CN100589526 C CN 100589526C
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Abstract
An image pick-up system and the process control the transmissivity of each pixel in an optical element through utilizing the analysis of the darker pixel and brighter pixel in an image sensor, therebyincreasing the dynamic range of the image, presenting the details of the brighter portion and the darker portion. The image pick-up system comprises an optical element which defines a plurality of pixels with variable transmissivity, and is used to modulate the image which is received, at least a optical lens which is used to focus the image which is modulated, an image sensor which is used to transform the image which is focused into electric signals, a processing unit which outputs control signals as responding the electric signals which are outputted by the image sensor, and respectively controls the transmissivity of each pixel in the optical element, and a storage unit which couples with the processing unit to store the image data.
Description
Technical field
The present invention relates to a kind of image picking system and method thereof, in more detail, relate to the image picking system and the method thereof of the transmissivity of each pixel in a kind of may command optical element.
Background technology
Image picking system is when exposure, and the pixel that is obtained on the imageing sensor can be subjected to aperture size, aperture time and scene brightness influence.The former two is identical for all pixels, yet the latter but can be different because of the bright degree in each zone in the scene.But if the luminance difference of zones of different is excessive in the scene, this is called high dynamic range, and (dynamic range refers to the light scope of picking up in the image, from darker shadow region to bright high-brightness region), some zone in the image then easily takes place to be crossed dark or cross bright and cause the loss of details.
For the problems referred to above, existing common technology is to see through the brightness on every side of pixel of back-end software each pixel of a pixel ground analysis to change, and flexibly adjusts contrast, to represent the information of dark portion and highlights.This type of technology is strengthened different titles such as (contrast enhancement), dynamic exposure correction (D-lighting) with contrast and is occurred in image picking system.
The shortcoming of prior art is: the contrast reinforcement meeting of neighbor causes visually discontinuous because of different intensity.Moreover when if the saturated or brightness value of initial data all is zero, then this type of technology just can't play a role.This problem mainly be imageing sensor in exposure process, fail to adjust the exposure of each pixel according to each regional brightness in the scene.
Summary of the invention
An object of the present invention is to provide a kind of image picking system, utilize the analysis of the darkest and bright spot groups in its imageing sensor to control the transmissivity of each pixel in the optical element, and then promote the dynamic range of image, show the details of highlights and dark portion.
Another object of the present invention provides a kind of image pickup method, be used for image picking system, this image picking system comprises optical element, definition has the pixel of a plurality of variable transmissivity, utilize the analysis of the darkest and bright spot groups in its imageing sensor to control the transmissivity of each pixel in the optical element, and then promote the dynamic range of image, show the details of highlights and dark portion.
According to one aspect of the present invention, more than can realize by the following map picking up system is provided with other purpose.A kind of image picking system, it comprises: liquid crystal panel, definition has the pixel of a plurality of variable transmissivity, in order to modulate the image that is received; At least one lens are in order to the image focusing after will modulating; Imageing sensor becomes the signal of telecommunication in order to the image transitions after will focusing on; Processing unit, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this liquid crystal panel respectively; And memory cell, be coupled with this processing unit, in order to storing image data, wherein this processing unit is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.In another preferred embodiment, this imageing sensor comprise a plurality of charge coupled cells (charge coupled device, CCD).In another preferred embodiment, this imageing sensor comprise a plurality of complementary metal oxide semiconductors (CMOS)s (complementary metal-oxide semiconductor, CMOS).In another preferred embodiment, this image picking system is a digital camera.In another preferred embodiment, this image picking system is a digital camera.In another preferred embodiment, this image picking system is a camera cell phone.
According to another aspect of the present invention, more than can realize by the following map picking up system is provided with other purpose.A kind of image picking system comprises: at least one lens, in order to the image focusing that will be received; Liquid crystal panel, definition has the pixel of a plurality of variable transmissivity, in order to modulate the image after this focusing; Imageing sensor becomes the signal of telecommunication in order to the image transitions after will modulating; Processing unit, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this liquid crystal panel respectively; And memory cell, be coupled with this processing unit, in order to storing image data, wherein this processing unit is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.In another preferred embodiment, this imageing sensor comprises a plurality of charge coupled cells.In another preferred embodiment, this imageing sensor comprises a plurality of complementary metal oxide semiconductors (CMOS)s.In another preferred embodiment, this image picking system is a digital camera.In another preferred embodiment, this image picking system is a digital camera.In another preferred embodiment, this image picking system is a camera cell phone.
According to another aspect of the present invention, more than can realize by the following map pick-up method is provided with other purpose.A kind of image pickup method, be used for image picking system, this image picking system comprises liquid crystal panel, and definition has the pixel of a plurality of variable transmissivity, comprise the following step: (a) first image of receiving target thing, and modulate first image with liquid crystal panel with default transmissivity; (b) first image focusing after will modulating; (c) first imagery exploitation, one imageing sensor after will focusing on converts first signal of telecommunication to; (d) in response to first signal of telecommunication, and export a control signal, to adjust the transmissivity of each pixel in the liquid crystal panel respectively; (e) receive second image of same object and modulate second image with the liquid crystal panel of adjusting transmissivity; (f) second image focusing after will modulating; (g) this imageing sensor of second imagery exploitation after will focusing on converts second signal of telecommunication to; And (h) store this second signal of telecommunication, wherein step (d) is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.In a preferred embodiment, in step (d) and (e), also comprise: the transmissivity to all pixels in this liquid crystal panel is carried out trim step.
According to of the present invention more on the one hand, more than can realize by the following map pick-up method is provided with other purpose.A kind of image pickup method is used for image picking system, and this image picking system comprises liquid crystal panel, and definition has the pixel of a plurality of variable transmissivity, comprises the following step: (a) first image of receiving target thing and with first image focusing that is received; (b) modulate first image after this focusing with liquid crystal panel with default transmissivity; (c) first imagery exploitation, one imageing sensor after will modulating converts first signal of telecommunication to; (d) in response to first signal of telecommunication, and export a control signal, to adjust the transmissivity of each pixel in the liquid crystal panel respectively; (e) receive second image of same object and with second image focusing that is received; (f) modulate second image after this focusing with the liquid crystal panel of adjusting transmissivity; (g) this imageing sensor of second imagery exploitation after will modulating converts second signal of telecommunication to; And (h) store this second signal of telecommunication, wherein step (d) is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.In a preferred embodiment, in step (d) and (e), also comprise: the transmissivity to all pixels in this liquid crystal panel is carried out trim step.
Description of drawings
Fig. 1 shows the image picking system 10 according to the preferred embodiment of the present invention;
Fig. 2 shows the image picking system 20 according to another preferred embodiment of the present invention;
Fig. 3 shows the flow process according to the image pickup method of the preferred embodiment of the present invention;
Fig. 4 shows the flow process according to the image pickup method of another preferred embodiment of the present invention;
The example of each pixel in Fig. 5 display optics;
The example of the transmissivity of each pixel in Fig. 6 display optics;
The example of the brightness value of Fig. 7 pixel that image sensor is obtained;
Fig. 8 shows the example of the transmissivity of each pixel in adjusted optical element;
Another example of the transmissivity of each pixel in the optical element of Fig. 9 demonstration after fine setting.
[main element symbol description]
10 image picking systems
20 image picking systems
101 optical elements
103 lens
105 imageing sensors
107 processing units
109 memory cell
111 object images
Image after 113 modulation
Image after 115 focusing
117 signals of telecommunication
119 control signals
201 lens
203 optical elements
205 imageing sensors
207 processing units
209 memory cell
211 object images
Image after 213 focusing
Image after 215 modulation
217 signals of telecommunication
219 control signals
The S301-S409 step
Embodiment
For further understanding the above-mentioned purpose of the present invention, function, characteristics and advantage, hereinafter will cooperate appended graphic the preferred embodiments of the present invention that further specify.
Fig. 1 shows the image picking system 10 according to the preferred embodiments of the present invention.This image picking system 10 comprises: optical element 101, and definition has the pixel of a plurality of variable transmissivity, in order to modulate the image that is received; At least one lens 103 are in order to the image focusing after will modulating; Imageing sensor 105 becomes the signal of telecommunication in order to the image transitions after will focusing on; Processing unit 107, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this optical element respectively; And memory cell 109, be coupled with this processing unit 107, in order to storing image data.In a preferred embodiment, this optical element 101 is a liquid crystal panel.In another preferred embodiment, this imageing sensor 105 comprise a plurality of charge coupled cells (charge coupled device, CCD).In another preferred embodiment, this imageing sensor 105 comprise a plurality of complementary metal oxide semiconductors (CMOS)s (complementary metal-oxide semiconductor, CMOS).In another preferred embodiment, this image picking system 10 is digital cameras.In another preferred embodiment, this image picking system 10 is digital cameras.In another preferred embodiment, this image picking system 10 is camera cell phones.
In Fig. 1, the image of signal code 111 expression objects; Signal code 113 expressions are through the image of optical element 101 modulation; The image that signal code 115 expressions focus on through lens 103; Signal code 117 expressions are through imageing sensor 105 electrical signal converted; Signal code 119 expressions are by the control signal of processing unit 107 outputs.
Fig. 3 shows the flow process according to the image pickup method of above-mentioned image pick-up device 10.In step 301, the image that the image of optical element 101 receiving target things and modulation are received more specifically, that is utilizes the transmissivity that each pixel is preset in the optical element 101 to come modulation image.In step 302, the image focusing after will modulating with lens 103 is to imageing sensor 105.In step 303, the image transitions after imageing sensor 105 will focus on becomes the signal of telecommunication and is sent to processing unit 107.In step 304, processing unit 107 is in response to this signal of telecommunication, and the output control signal, to adjust the transmissivity of each pixel in the optical element 101 respectively.More specifically, can design the rule of transmissivity and brightness value according to user demand.For instance, the example figure of the pixel in Fig. 5 display optics 101, clear and easy to understand for making the present invention, among the figure only the form of quadruple four illustrate, and represent each pixel, for example pixel A (0,0), pixel A (1,0) etc. with matrix representation.As shown in Figure 6, the transmissivity of each pixel all is preset as 50% in the optical element 101, after optical element 101 is with this transmissivity modulation object image, again via lens focus in imageing sensor 105.For instance, the brightness value of each pixel of the image that imageing sensor 105 is received as shown in Figure 7, wherein brightness value 0 expression is the darkest, brightness value 255 expressions are the brightest.(for example A (0 with the pixel of the pairing optical element 101 of pixel of brightness value greatly (for example 255) then can to see through processing unit 107 output control signals 119,0), A (0,1), A (1,0)) is adjusted to and has less transmissivity (for example 10%), and with the pixel of the pairing optical element 101 of pixel of less brightness value (for example 0) (for example A (0,3), A (1,3), A (2,3), A (3,2), A (3,3)) be adjusted to and have bigger transmissivity (for example 90%), as shown in Figure 8.In a preferred embodiment, transmissivity and brightness value are linear.In another preferred embodiment, transmissivity becomes non-linear relation with brightness value.It should be noted, spirit of the present invention is to utilize the dark transmissivity of controlling each pixel in the optical element than the analysis of bright pixel that reaches in the imageing sensor, and then the dynamic range of lifting image, show the details of highlights and dark portion, and the algorithm of adjusting the transmissivity of pixel can be made different designs according to different user demands, and the present invention is not limited to aforementioned algorithm.
In step 305, optical element 101 receives the image of same object and modulates the image that is received with adjusted transmissivity.In step 306, image focusing after will modulating with lens 103, in this case, because the previous brighter pairing optical element pixel of pixel is adjusted to less transmissivity, and the previous darker pairing optical element pixel of pixel is adjusted to bigger transmissivity, so the image of gained has bigger dynamic range.In step 307, convert the imagery exploitation imageing sensor 105 after this focusing to the signal of telecommunication.In step 308, store this signal of telecommunication in memory cell 109.
In another preferred embodiment, also comprise between step S304 and S305: the transmissivity to all pixels in this optical element is carried out trim step S309.Particularly, behind the step S304, the transmissivity of pixel is adjusted to as shown in Figure 8, and behind trim step S309 of the present invention, the transmissivity of each pixel through finely tuning as shown in Figure 9.Transmissivity among Fig. 9 is by following mode gained: the transmissivity of A (0,0), A (0,1), A (1,0), A (1,1) is added the General Logistics Department divided by 4 transmissivities (25%) that obtain new A (0,0); The transmissivity of A (0,0), A (0,1), A (0,2), A (1,0), A (1,1), A (1,2) is added the General Logistics Department divided by 6 transmissivities (36%) that obtain new A (0,1); The transmissivity of A (0,1), A (0,2), A (0,3), A (1,1), A (1,2), A (1,3) is added the General Logistics Department divided by 6 transmissivities (63%) that obtain new A (0,2); The transmissivity of A (0,2), A (0,3), A (1,2), A (1,3) is added the General Logistics Department divided by 4 transmissivities (75%) that obtain new A (0,3); The transmissivity of A (0,0), A (0,1), A (1,0), A (1,1), A (2,0), A (2,1) is added the General Logistics Department divided by 6 transmissivities (27%) that obtain new A (1,0); The transmissivity of A (0,0), A (0,1), A (0,2), A (1,0), A (1,1), A (1,2), A (2,0), A (2,1), A (2,2) is added the General Logistics Department divided by 9 transmissivities (39%) that obtain new A (1,1); The transmissivity of A (0,1), A (0,2), A (0,3), A (1,1), A (1,2), A (1,3), A (2,1), A (2,2), A (2,3) is added the General Logistics Department divided by 9 transmissivities (63%) that obtain new A (1,2); In like manner obtain the transmissivity (77%) of new A (1,3); The transmissivity (33%) of new A (2,0); The transmissivity (48%) of new A (2,1); The transmissivity (70%) of new A (2,2); The transmissivity (83%) of new A (2,3); The transmissivity (30%) of new A (3,0); The transmissivity (47%) of new A (3,1); The transmissivity (67%) of new A (3,2); The transmissivity (83%) of new A (3,3).It should be noted that spirit of the present invention is to see through this trim step S309, can obtain more level and smooth variation, so highlights and dark portion details can effectively manifest and not have visual acute variation.
Fig. 2 shows the block schematic diagram according to the image picking system 20 of another preferred embodiment of the present invention.This image picking system 20 is with the difference of the image picking system 10 of Fig. 1: modulation and the sequencing that focuses on.This image picking system 20 comprises: at least one lens 201, in order to the image focusing that will be received; Optical element 203, definition has the pixel of a plurality of variable transmissivity, in order to modulate the image after this focusing; Imageing sensor 205 becomes the signal of telecommunication in order to the image transitions after will modulating; Processing unit 207, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this optical element respectively; And memory cell 209, be coupled with this processing unit 207, in order to storing image data.In a preferred embodiment, this optical element 203 is a liquid crystal panel.In another preferred embodiment, this imageing sensor 205 comprises a plurality of charge coupled cells.In another preferred embodiment, this imageing sensor 205 comprises a plurality of complementary metal oxide semiconductors (CMOS)s.In another preferred embodiment, this image picking system 20 is digital cameras.In another preferred embodiment, this image picking system 20 is digital cameras.In another preferred embodiment, this image picking system 20 is camera cell phones.
In Fig. 2, the image of signal code 211 expression objects; The image that signal code 213 expressions focus on through lens 203; Signal code 215 expressions are through the image of optical element 201 modulation; Signal code 217 expressions are through imageing sensor 205 electrical signal converted; Signal code 219 expressions are by the control signal of processing unit 207 outputs.
Fig. 4 shows the schematic flow sheet according to the image pickup method of above-mentioned image pick-up device 20.In step 401, the image of lens 201 receiving target things and with the image focusing that received to optical element 203.In step 402, the image after this focuses on optical element 203 modulation more specifically, that is utilizes the transmissivity that each pixel is preset in the optical element 203 to come modulation image.In step 403, the image transitions after imageing sensor 205 will be modulated becomes the signal of telecommunication and is sent to processing unit 207.In step 404, processing unit 207 is in response to this signal of telecommunication, and the output control signal, to adjust the transmissivity of each pixel in the optical element 203 respectively.More specifically, can design the rule of transmissivity and brightness value, owing to this part is described in detail, so repeat no more in this in preamble according to user demand.
In step 405, lens 201 receive the image of same object and with the image focusing that received to optical element 203.In step 406, optical element 203 is modulated the image of line focus with adjusted transmissivity, in this case, because the previous brighter pairing optical element pixel of pixel is adjusted to less transmissivity, and the previous darker pairing optical element pixel of pixel is adjusted to bigger transmissivity, so the image of gained has bigger dynamic range.In step 407, convert the imagery exploitation imageing sensor 205 after this modulation to the signal of telecommunication.In step 408, store this signal of telecommunication in memory cell 209.
In another preferred embodiment, also comprise between step S404 and S405: the transmissivity to all pixels in this optical element is carried out trim step S409.Because this part is described in detail in preamble, so repeat no more in this.
Though it is open in detail that the present invention has utilized above-mentioned preferred embodiment to give; right its is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is worked as with being as the criterion that appended claim was defined.
Claims (10)
1. image picking system comprises:
Liquid crystal panel, definition has the pixel of a plurality of variable transmissivity, in order to modulate the image that is received;
At least one lens are in order to the image focusing after will modulating;
Imageing sensor becomes the signal of telecommunication in order to the image transitions after will focusing on;
Processing unit, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this liquid crystal panel respectively; And
Memory cell is coupled with this processing unit, in order to storing image data,
Wherein this processing unit is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.
2. image picking system as claimed in claim 1, wherein this imageing sensor comprises a plurality of charge coupled cells or a plurality of complementary metal oxide semiconductors (CMOS).
3. image picking system as claimed in claim 1, wherein this image picking system is a kind of in digital camera, digital camera or the camera cell phone.
4. image picking system comprises:
At least one lens are in order to the image focusing that will be received;
Liquid crystal panel, definition has the pixel of a plurality of variable transmissivity, in order to modulate the image after this focusing;
Imageing sensor becomes the signal of telecommunication in order to the image transitions after will modulating;
Processing unit, the signal of telecommunication of exporting in response to this imageing sensor and export control signal is to control the transmissivity of each pixel in this liquid crystal panel respectively; And
Memory cell is coupled with this processing unit, in order to storing image data,
Wherein this processing unit is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.
5. image picking system as claimed in claim 4, wherein this imageing sensor comprises a plurality of charge coupled cells or a plurality of complementary metal oxide semiconductors (CMOS).
6. image picking system as claimed in claim 4, wherein this image picking system is a kind of in digital camera, digital camera or the camera cell phone.
7. an image pickup method is used for image picking system, and this image picking system comprises liquid crystal panel, and definition has the pixel of a plurality of variable transmissivity, comprises the following step:
(a) first image of receiving target thing and modulate first image with liquid crystal panel with default transmissivity;
(b) first image focusing after will modulating;
(c) the first imagery exploitation imageing sensor after will focusing on converts first signal of telecommunication to;
(d) in response to first signal of telecommunication, and the output control signal, to adjust the transmissivity of each pixel in the liquid crystal panel respectively;
(e) receive second image of same object, and modulate second image with the liquid crystal panel of adjusting transmissivity;
(f) second image focusing after will modulating;
(g) this imageing sensor of second imagery exploitation after will focusing on converts second signal of telecommunication to; And
(h) store this second signal of telecommunication,
Wherein step (d) is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.
8. method as claimed in claim 7 in step (d) and (e), also comprises: the transmissivity to all pixels in this liquid crystal panel is carried out trim step.
9. an image pickup method is used for image picking system, and this image picking system comprises liquid crystal panel, and definition has the pixel of a plurality of variable transmissivity, comprises the following step:
(a) first image of receiving target thing and with first image focusing that is received;
(b) modulate first image after this focusing with liquid crystal panel with default transmissivity;
(c) the first imagery exploitation imageing sensor after will modulating converts first signal of telecommunication to;
(d) in response to first signal of telecommunication, and the output control signal, to adjust the transmissivity of each pixel in the liquid crystal panel respectively;
(e) receive second image of same object and with second image focusing that is received;
(f) modulate second image after this focusing with the liquid crystal panel of adjusting transmissivity;
(g) this imageing sensor of second imagery exploitation after will modulating converts second signal of telecommunication to; And
(h) store this second signal of telecommunication,
Wherein step (d) is according to the analysis of the darkest in this imageing sensor and bright spot groups, and exports this control signal.
10. method as claimed in claim 9 in step (d) and (e), also comprises: the transmissivity to all pixels in this liquid crystal panel is carried out trim step.
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