CN201742480U - Image sensor - Google Patents
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- CN201742480U CN201742480U CN2010202221415U CN201020222141U CN201742480U CN 201742480 U CN201742480 U CN 201742480U CN 2010202221415 U CN2010202221415 U CN 2010202221415U CN 201020222141 U CN201020222141 U CN 201020222141U CN 201742480 U CN201742480 U CN 201742480U
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Abstract
The utility model provides an image sensor, comprising an image acquisition module used for acquiring exposed image information and environment light intensity, an analog processing module used for performing analog process on the image information to acquire image data; a digital processing module used for performing digital process on the image data subjected to the analog process, and a control module used for judging the environment light intensity, if the surround light intensity is less than the preset light intensity, the analog processing module processes image information to obtain a row of image data, then the control module controls the analog processing module to stop processing, and then controls the digital processing module to perform digital processing to the row of image data transmitted by the analog processing module, in this way, the quality of display images of the image sensor is improved.
Description
Technical field
The utility model relates to image processing field, particularly a kind of imageing sensor.
Background technology
At present, along with development of semiconductor, imageing sensor has been applied in all kinds of digital products widely, for example digital camera, Digital Video or the like disclose a kind of signal handling equipment and signal processing method that is used for imageing sensor in the Chinese patent literature of application number " 200710101004.9 ".
Existing imageing sensor has structure shown in Figure 1 usually, comprises pel array 10, the analog processing circuit 20 that links to each other with pel array 10, the digital processing circuit 40 that links to each other with analog processing circuit 20.Wherein pel array 10 is to be made of plurality of pixels (photosensitive unit), and pixel can perceive the light intensity of a very small region.When light source exposes to pel array 10, the light signal that analog processing circuit 20 can obtain to expose, and this light signal carried out simulation process, and be converted to digital signal, then send digital processing circuit 40 to and carry out digital processing, because there is delay on the circuit, the digital processing meeting postpones some times than simulation process, the analog processing circuit for example shown in Figure 2 and the working timing figure of digital processing circuit like this.
But, adopt the work schedule of above-mentioned analog processing circuit and digital processing circuit, utility model people finds, has difference between the image different piece brightness of final output, this difference, under brighter ambient light,, and be not easy to show because signal is more intense, but under the darker ambient light or show under the situation of bigger gain very serious arranged.
Therefore, need a kind of new imageing sensor, it is inconsistent brightness to occur with the image of avoiding exporting.
The utility model content
The technical problem that the utility model solves provides a kind of imageing sensor, thereby improves the quality of imageing sensor display image.
In order to solve the problems of the technologies described above, the utility model provides a kind of imageing sensor, comprising:
Image capture module is used to gather exposed images information and environmental light intensity;
The simulation process module is used for that image information is carried out simulation process and obtains view data;
Digital signal processing module is used for the view data after the simulation process is carried out digital processing;
Control module, be used to judge environmental light intensity, if environmental light intensity is during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the control figure processing module is carried out digital processing to the last delegation's view data that sends of simulation process module.
Compared with prior art, the utility model mainly has the following advantages:
The utility model is by judging the light intensity of exposure, thereby under the brighter situation of light, adopt the existing mode image data processing, under the darker situation of light after simulation process obtains the view data of delegation, suspend simulation process, begin delegation's view data of last acquisition is carried out digital processing, thereby the problem of having avoided digital signal processing module and simulation process module to crosstalk has improved the picture quality that imageing sensor shows.
Description of drawings
By the more specifically explanation of the preferred embodiment of the present utility model shown in the accompanying drawing, above-mentioned and other purpose, feature and advantage of the present utility model will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing, focus on illustrating purport of the present utility model by actual size equal proportion convergent-divergent.
Fig. 1 is a kind of structural representation of existing imageing sensor;
Fig. 2 is a kind of analog processing circuit of existing imageing sensor and the working timing figure of digital processing circuit;
Fig. 3 is the structural representation of imageing sensor one embodiment of the present utility model;
Fig. 4 is the structural representation of another embodiment of imageing sensor of the present utility model;
Fig. 5 is the flow chart of graphical sensory device one embodiment of the present utility model;
Fig. 6 is working timing figure under the half-light for the analog processing circuit of graphical sensory device of the present utility model and digital processing circuit at surround lighting;
Fig. 7 is working timing figure under the light for the analog processing circuit of graphical sensory device of the present utility model and digital processing circuit at surround lighting.
Embodiment
At the problems referred to above, through research, the inventor finds owing to following reason causes: along with the development of cmos semiconductor technology and integrated circuit (IC) design technology, the chip feature size is more and more littler, integrated level is more and more higher, the digital processing circuit of imageing sensor and analog processing circuit are easy to generate the phenomenon that interferes with each other more, especially analog processing circuit and digital processing circuit start have staggered in, because the variation of power consumption makes the voltage of analog processing circuit have certain decline before digital processing circuit starts and after starting, the variation of this voltage, the image of process simulation process and digital processing output before finally making digital processing circuit start, can produce small difference with the image through simulation process and digital processing output after the digital processing circuit startup, cause occurring on the last image of exporting the differentiated phenomenon of brightness of a part of image brightness and another part image.
Further discover, under the darker ambient light or have the particularly serious reason that shows under the situation of bigger gain to be: under the darker light or under the bigger situation of gain, during processing image information, analog processing circuit starts earlier, digital processing circuit delay start under the situation that simulation process is not suspended, when starting, digital processing circuit make analog processing circuit cause certain pressure drop like this because therefore load increases, therefore the intensity of the viewdata signal of analog processing circuit output reduce, thereby make final image brightness through digital processing circuit output weaken.Handle because image is a delegation of delegation, therefore when showing the image of each row, after digital processing circuit starts, all can have the problem of brightness deterioration, thereby make the image of output form a bright dark boundary at the same position of every row.
At above-mentioned reason, the utility model provides a kind of imageing sensor, comprising: image capture module is used to gather exposed images information and environmental light intensity; The simulation process module is used for that image information is carried out simulation process and obtains view data; Digital signal processing module is used for the view data after the simulation process is carried out digital processing; Control module, be used to judge environmental light intensity, if environmental light intensity is during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the control figure processing module is carried out digital processing to the last delegation's view data that sends of simulation process module.
By judging the light intensity of exposure, thereby under the brighter situation of light, adopt the existing mode image data processing, under the darker situation of light after simulation process obtains the view data of delegation, suspend simulation process, begin delegation's view data of last acquisition is carried out digital processing, thereby the inconsistent problem of brightness between the image different piece of the output of having avoided digital signal processing module and simulation process module to crosstalk causing has improved the picture quality that imageing sensor shows.
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, specific implementation of the present utility model is described in detail below in conjunction with accompanying drawing.
Fig. 3 is the structural representation of imageing sensor one embodiment of the present utility model, and as shown in Figure 3, imageing sensor of the present utility model comprises:
When surround lighting when being bright, can utilize the processing method of existing image information, for example when handling the image information of delegation, after simulation process module 130 starts, for example after the delay of oversampling circuit, (in the simulation process resume module view data) do not send enabling signals to data processing module 140 when the simulation process module also finishes the image information simulation process of this row, for example when analog processing circuit began to handle the 40th～100 pixel of this delegation, log-on data processing module 140 was carried out digital processing.Just when simulation begins to handle delegation's view data, carry out digital processing with regard to directly giving digital signal processing module 140, and after the view data of the intact delegation of simulation process, digital circuit also can be finished processing in the short time, basically belong to parallel processing, relatively save on the time.
When surround lighting when being dark, after simulation process module 130 is finished Image Information Processing acquisition delegation view data, send stop signal to simulation process module 130, control simulation process module is suspended processing, send enabling signal to digital signal processing module 140, the control figure processing module is carried out digital processing to the last delegation's view data that sends of simulation process module.
As shown in Figure 4, in a specific implementation, described control module 120 comprises can digital processing time delay module 1202, be used at environmental light intensity during less than predetermined light intensity, view data after the described simulation process is postponed, view data after postponing is carried out digital processing, and described time of delay is greater than the processing time of simulation process delegation image information.
Further, described control module 120 can comprise simulation process time delay module 1203, be used at environmental light intensity during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the time of described time-out simulation process is greater than the time of digital processing delegation view data.
Further, described simulation process module 130 also comprises:
Analog-to-digital conversion module 1302 is used for the image information after the analog is carried out analog-to-digital conversion.
The working method of the above-mentioned imageing sensor of following structure further specifies imageing sensor of the present utility model.With reference to figure 5, step is as follows:
Step S11, image capture module 110 is gathered environmental light intensity, and control module 120 judges that whether environmental light intensity is less than predetermined light intensity.Described predetermined light intensity can be set for the environmental light intensity when image brightness occurring and change, and for example predetermined light intensity can be 50lux.
Step S12, image capture module 110 is gathered the delegation's image information (being light intensity signal) after the exposure.
If environmental light intensity then enters step 21 less than predetermined light intensity, if environmental light intensity does not enter step S21 ' greater than predetermined light intensity.
Step S21,130 pairs of image informations of simulation process module are carried out the series analog memory processing, after the view data of simulation process acquisition delegation, suspend simulation process.
Step S22, delegation's view data of 140 pairs of acquisitions of digital signal processing module is carried out serial digital and is handled.Simultaneously, continue step S12, to the last image information has all been gathered.
It is darker that environmental light intensity is ambient light less than predetermined light intensity, because picture signal is more weak, the gain of picture signal is bigger, the module of therefore carrying out digital processing influences meeting big (under the bigger situation of gain, the effect of above-mentioned influence equally also can be exaggerated) to the view data of output before and after starting.Because image processing is normally carried out line by line, therefore make when carrying out the output of delegation's image, the module of carrying out digital processing starts moment and can cause load to increase, thereby cause the supply voltage of the module of carrying out simulation process to descend, therefore carry out the weakened of image information of the module output of simulation process, cause the image brightness can deepening, thereby can occur more significantly demarcating (being the segmentation phenomenon) in this moment.At this situation, the utility model utilization preestablishes predetermined light intensity, and the environmental light intensity in the time of for example can occurring more significantly demarcating according to the situation setting of reality is predetermined light intensity (being specifically as follows 50lux).Thereby just think that greater than this predetermined light intensity ambient light is bright (being that the problem that above-mentioned digital simulation is crosstalked does not cause fatal influence to it), just think that less than this predetermined light intensity ambient light is dark (being that the problem that above-mentioned digital simulation is crosstalked can cause fatal influence to it).
Concrete, if environmental light intensity is less than predetermined light intensity, image information is carried out simulation process in described serial and digital processing also comprises: utilize the view data after 1202 pairs of described simulation process of digital delay module to postpone, view data after postponing is carried out digital processing, described time of delay is greater than the processing time of simulation process delegation image information, like this by postponing to make that carrying out simulation process obtains in delegation's view data process, obtain after the view data of last pixel, just begin the view data of first pixel is carried out digital processing, thereby the serial that has guaranteed digital processing and simulation process is carried out, and the concrete grammar of described delay for example can pass through buffer (buffer memory) to be realized.As for judging that when the simulation process of delegation finishes, be the means that realized in the existing imageing sensor, repeat no more.And can in this time of delay, the image information to next line gather, because the time that the half-light hypograph is gathered is longer, even therefore serial process delegation image information can not cause the delay that image shows yet.
In another embodiment, described control module 120 can also comprise that memory module is (not shown, can be used for replacing the digital processing Postponement module), be used at environmental light intensity during less than predetermined light intensity, the view data that obtains after the described simulation process is stored, when finishing delegation's image data storage, this row view data of storage is issued digital signal processing module carry out digital processing.Described storage is identical with the above-mentioned effect that view data after the described simulation process is postponed, and repeats no more.
Please refer to Fig. 6, after simulation process begins, do not start earlier digital processing, after the simulation process image information obtains delegation's view data, suspend simulation process, described simulation process comprise with light intensity signal (being image information) amplify, a series of processing of filtering, shaping or the like, pass through modulus (AD) conversion afterwards again, be converted to digital signal, thereby obtain offering the view data of digital signal processing module.Then the view data of this row of obtaining after the simulation process is carried out digital processing.Concrete data processing can comprise the optimization process of images such as automatic exposure, Automatic white balance, automatic gain, gamma.
Further, described control module 120 can comprise simulation process time delay module 1203, be used at environmental light intensity during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the time of described time-out simulation process is greater than the time of digital processing delegation view data.The time of described time-out simulation process is greater than the time of digital processing delegation view data.Like this if under the situation of the time of IMAQ less than the time of digital processing delegation view data, also can guarantee after the digital processing of the view data of finishing lastrow, just to begin successive image information is carried out the view data that simulation process is obtained next line.Like this after the image information of simulation process delegation finishes, in digital processing, carry out the collection of next line image information, because the time that the half-light hypograph is gathered is longer, just utilized the acquisition time of image to carry out digital processing, so, even carry out simulation process and digital processing with delegation's image information serial, the delay that also can not cause image to show.
The utility model suspends simulation process, thereby can not have the problem of crosstalking the image information serial process when promptly delegation's view data being carried out digital processing.Make the picture quality that shows improve greatly.Simultaneously and since under half-light photosensitive array that image is gathered the used time is longer, promptly the frequency half-light under is lower, so can not cause the problem of delay because of analog-and digital-serial process.
Step S21 ', 130 pairs of image informations of simulation process module are carried out Parallel Simulation and are handled.
Step S22 ', delegation's view data of 140 pairs of acquisitions of digital signal processing module is carried out Parallel Digital and is handled.Simultaneously, return step S11, in other words, described control module 120 is all carried out the judgement of environmental light intensity and predetermined light intensity magnitude after the view data of simulation process acquisition delegation, can prevent that like this environmental light intensity from changing the image that causes finally exporting suddenly and the brightness disproportionation situation occurring.So just, control module 120 is when digital signal processing module carries out digital processing, and the control image capture module is gathered successive image information and environmental light intensity.To the last image information has all been gathered.
If environmental light intensity greater than predetermined light intensity, carries out Parallel Simulation to image information and handles and digital processing, specifically can utilize the parallel method that image information is handled well known to those skilled in the art.Walk abreast image information is treated to technology as well known to those skilled in the art, because when image information is handled is the processing of delegation of delegation, therefore when processing image information, can carry out simulation process to image information earlier and obtain delegation's view data, the simulation process certain hour (is the time of delay of digital processing, be generally the time of the several pixels of simulation process) after, when not suspending simulation process, the view data that is obtained is carried out digital processing.
Particularly, parallel simulation process and digital processing sequential please refer to Fig. 7, promptly when the simulation process image information, the view data that obtains after the simulation process is carried out digital processing, and only at interval certain time of delay (because circuit all has the delay on the circuit) between digital processing and the simulation process, and digital signal processing module is through gathering in view data, processing and analog-to-digital conversion process (being the simulation process process) start afterwards, for example when simulation process begins to handle the 40th～100 pixel of delegation, start digital processing (the sort signal processing mode is parallel processing), therefore simulation process and digital processing have the intersection time of carrying out simultaneously when processing image information, just in simulation beginning processing image information, when continuing simulation process successive image information, the view data that obtains after the preceding continuous simulation process is carried out digital processing, and simultaneously in the intact image information acquisition delegation of simulation process view data, digital processing circuit also can be finished processing to this row view data in short time, belongs to parallel processing basically.
Also can behind series analog memory treatment step S21, return step S12 in another embodiment, gather the delegation's image information after exposing, and after simulation process and digital processing obtain the view data of a frame, just return the collection that step S11 carries out an environmental light intensity, and to the judgement of environmental light intensity and predetermined light intensity magnitude, the step of like this can simplified image handling.
The utility model adopts the advantage in environmental light intensity parallel processing image information greater than predetermined light intensity the time to be: picture signal is more intense, digital signal processing module is little to the influence of the view data of output in the startup front and back, and because the gain under the light is very little, the be invisible to the naked eye existence of segmentation, the phenomenon of image segmentation can be ignored substantially.The utility model is at environmental light intensity greater than predetermined light intensity the time, utilize the timing method of the processing image information of prior art to handle, after being the very short time of simulation process, begin that simulation process is obtained view data and carry out digital processing, can keep frame per second like this, relatively save on the time than higher circuit speed and image.
Above-mentioned collection light intensity signal and environmental light intensity, and simulation process is ability and the known technology of technical staff, therefore repeats no more.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (7)
1. an imageing sensor is characterized in that, comprising:
Image capture module is used to gather exposed images information and environmental light intensity;
The simulation process module is used for that image information is carried out simulation process and obtains view data;
Digital signal processing module is used for the view data after the simulation process is carried out digital processing;
Control module, be used to judge environmental light intensity, if environmental light intensity is during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the control figure processing module is carried out digital processing to the last delegation's view data that sends of simulation process module.
2. imageing sensor according to claim 1 is characterized in that, control module is when digital signal processing module carries out digital processing, and the control image capture module is gathered successive image information and environmental light intensity.
3. imageing sensor according to claim 1 is characterized in that, described control module is all carried out the judgement of environmental light intensity and predetermined light intensity magnitude after the view data of simulation process acquisition delegation.
4. imageing sensor according to claim 1 is characterized in that, obtains all to carry out after the view data of a frame judgement of environmental light intensity and predetermined light intensity magnitude in simulation process and digital processing.
5. according to claim 3 or 4 described imageing sensors, it is characterized in that, described control module comprises memory module, be used at environmental light intensity during less than predetermined light intensity, the view data that obtains after the described simulation process is stored, when finishing delegation's image data storage, this row view data of storage is issued digital signal processing module carry out digital processing.
6. according to claim 3 or 4 described imageing sensors, it is characterized in that, described control module comprises the digital processing time delay module, be used at environmental light intensity during less than predetermined light intensity, view data after the described simulation process is postponed, view data after postponing is carried out digital processing, and described time of delay is greater than the processing time of simulation process delegation image information.
7. according to claim 3 or 4 described imageing sensors, it is characterized in that, described control module comprises the simulation process time delay module, be used at environmental light intensity during less than predetermined light intensity, after the simulation process module is finished Image Information Processing acquisition delegation view data, control simulation process module is suspended processing, and the time of described time-out simulation process is greater than the time of digital processing delegation view data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202221415U CN201742480U (en) | 2010-06-01 | 2010-06-01 | Image sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010202221415U CN201742480U (en) | 2010-06-01 | 2010-06-01 | Image sensor |
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| CN201742480U true CN201742480U (en) | 2011-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271216A (en) * | 2010-06-01 | 2011-12-07 | 格科微电子（上海）有限公司 | Image sensor and signal processing method thereof |
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2010
- 2010-06-01 CN CN2010202221415U patent/CN201742480U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271216A (en) * | 2010-06-01 | 2011-12-07 | 格科微电子（上海）有限公司 | Image sensor and signal processing method thereof |
| CN102271216B (en) * | 2010-06-01 | 2013-09-04 | 格科微电子（上海）有限公司 | Image sensor and signal processing method thereof |
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Granted publication date: 20110209 |