CN101360192A - Digital optical imaging system and imaging method thereof - Google Patents
Digital optical imaging system and imaging method thereof Download PDFInfo
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- CN101360192A CN101360192A CNA2008100211581A CN200810021158A CN101360192A CN 101360192 A CN101360192 A CN 101360192A CN A2008100211581 A CNA2008100211581 A CN A2008100211581A CN 200810021158 A CN200810021158 A CN 200810021158A CN 101360192 A CN101360192 A CN 101360192A
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Abstract
The invention relates to a digital optical imaging system as well as an imaging method thereof. The system is composed of an optical imaging lens group, a DMD micro-mirror array, a CCD image sensor, an exposure time controller, a digital image processor and a controller. The imaging method comprises: making all active pixels in the MD micro-mirror array be in an open state to obtain the pre-imaging of an object being shot, dividing a plurality of regions according to different actual luminance brightness levels after image processing, confirming corresponding exposure parameters required by each region, controlling the time for making the active pixels be in the open or closed state, and shooting and imaging the object being shot again to obtain clear and high-quality digital images. The invention provides the digital optical imaging system and the imaging method for carrying out the random subdivision and multi-step exposal to the object being shot, high quality pictures with high dynamic range can be acquired through one exposure, and the invention is particularly used for shooting and imaging the object being shot with obvious difference of luminance brightness.
Description
Technical field
The present invention relates to a kind of optical imaging system, particularly a kind of digital optical imaging system and formation method thereof.
Background technology
Optical imaging system is a most basic a kind of optical information processing system, and it is used to transmit the optical image information of two dimension, and camera (video camera) is one of modal optical imaging system.What control optical imaging system sensitization is to adopt fast gate technique, and shutter is divided into mechanical shutter and electronic shutter again.Mechanical shutter is a kind of traditional mechanical mechanism, compares with the electronic shutter in modern times, and complex structure, the requirement on machining accuracy height, structural volume is big, and the problem in useful life is arranged.It is that light sensing element is in the digital camera of core that electronic shutter appears at CCD, CMOS, and electronic shutter has not had pro forma tripper, is the sensitive time by Electronic Control sequential decision optical sensor, i.e. so-called time for exposure.No matter be mechanical shutter or electronic shutter, the imaging of a width of cloth to target finished in each exposure.
In actual photographed, all be to determine a time for exposure roughly generally for the bright dark target subject of difference.When the different brightness in many places regional in imaging object, occurring, be difficult to exposure demand by these zones of different reality, comprehensively, exposure exactly, finally cause having occurred on the picture local overexposure or local under-exposure.
At above-mentioned phenomenon, wish to obtain a kind of predeterminable optical imaging system of multistage sprite calmly, make each zone in the picture can both satisfy the exposure of actual light brightness.
Summary of the invention
In order to overcome the deficiency that prior art exists, goal of the invention of the present invention provides and a kind ofly can satisfy the zone that each required brightness is different in the picture and obtain actual required exposure amount, obtains digital optical imaging system and formation method thereof clear, qualitative picture.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of digital optical imaging system, form by optical imaging lens group, DMD micro reflector array, ccd image sensor, time for exposure controller, Digital Image Processor and controller, described controller is provided with two data channel interfaces, wherein one is connected with the video output terminals of Digital Image Processor by video interface, and another is connected with the control end of Digital Image Processor by control interface; Two outputs of described Digital Image Processor are connected with the input of time for exposure controller and the VT of ccd image sensor respectively; Two outputs of described time for exposure controller, output signal control DMD micro reflector array and ccd image sensor respectively.
The above-mentioned digital optical imaging of a kind of use system realizes imaging method, when the work pixel in the DMD micro reflector array all is in opening, the optical imaging lens group is passed through the DMD micro reflector array with target subject, pre-imaging is to ccd image sensor, after handling, image processor is input to imaging controller, by image processing software this image is divided into several regions according to different actual light brightness, determine the corresponding required exposure parameter in each zone, output signal to the time for exposure controller through Digital Image Processor, work pixel in the control DMD micro reflector array is in the time of unlatching or closed condition, once more target subject is passed through the DMD micro reflector array, imaging obtains digital image to ccd image sensor after image processor is handled.
The present invention utilizes the DMD micro reflector array, adopt methods such as pre-imaging, image region segmentation, the optical imaging system and the formation method of any branch and multistage exposure have been realized, just can obtain the high-quality picture of high dynamic range through single exposure, be specially adapted to the shooting imaging of the tangible target subject of luminance difference.
Description of drawings
Fig. 1 is the digital optical imaging system block diagram of the figure embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment:
Referring to accompanying drawing 1, it is the digital optical imaging system block diagram of present embodiment.
In the present embodiment, available PC is provided with two data channel interfaces as controller, and one is used for transmission of video digital information, is connected with image processor by video interface with LVDS form or CAMERA_LINK form; Another can adopt the logical bit signal or the program control of multichannel as input, the output interface of the order of function control, is connected with image processor by control interface.
Image processor in the system adopts ARM9 or DSP, its two outputs, one by video interface to the controller incoming video signal, another is connected with time for exposure controller input.An output of time for exposure controller sends the signal controlling ccd image sensor, another output output signal control DMD micro reflector array.In the present embodiment, the time for exposure controller adopts field programmable gate array timing sequencer FPGA, ccd image sensor adopts area array CCD FT-18, and the DMD micro reflector array adopts American TI Company TI 1076-729C DMD device (specification is 1024*768).
The DMD micro reflector array is made up of n*m micro-reflector work pixel, and each micro-reflector all has a unique gating address, according to micro-reflector control logic level, the state of two kinds of swings is arranged.Each micro-reflector work pixel can reflect light under different states to both direction, actual reflection direction is then decided on the state of bottom memory cell; When memory cell was in " closing " state, speculum can rotate to+12 degree, if memory cell is in " unlatching " state, speculum can rotate to-12 degree.In conjunction with DMD and suitable light source and projection optical system, speculum will enter the incident light reflection or leave the loophole of projection lens, utilize one of them state as reflective condition, another then is a non-reflective state, the signal that sends by the time for exposure controller, the time that the control micro-reflector is opened or closed, realize modulation, to reach the purpose of control exposure to light.
During the digital optical imaging system works, send work order by PC by control interface, all be in opening by the work pixel in the timing sequencer control DMD micro reflector array earlier, the optical imaging lens group is passed through the DMD micro reflector array with target subject, pre-imaging is to ccd image sensor, through the conversion of video a/d, the digital video information that forms 12 is saved in the video-ram.Image processor obtains to take the photograph in advance image from video-ram, be input among the PC through video interface, according to default scheme, as adopt image processing softwares such as edge treated, be divided into several regions according to taking the photograph the different actual light brightness of image in advance, and the address of the micro-reflector work pixel of corresponding time for exposure of definite each zone and correspondence, be in by the work pixel in the timing sequencer control control DMD micro reflector array and open or time of closed condition, control the process that area array CCD is finished single exposure, shooting more simultaneously.Zone location and exposure parameter will determine the regional exposure time bright in the target subject short, and the dark regional exposure time is longer.The shape in zone is an any enclosed, and each zones of different can obtain the different time for exposure, obtains digital image clear, high-quality after image processor is handled.
Exposure process control can be by following method: if take the photograph image in advance according to target subject, by actual light brightness be divided into bright, in, dark three parts, through the edge treated software processes, correspondence is divided into three region S 1, S2, S3, determines the address of the micro-reflector work pixel of corresponding three time for exposure T1, T2, T3 and correspondence.By time for exposure controller drives DMD micro reflector array, during formal the shooting, at first all the micro-reflector work pixels in the DMD micro reflector array are set to reflection position, and ccd image sensor begins optical charge integration (electron exposure), and the time for exposure is T1; The T1 time arrives, micro-reflector work pixel in the DMD micro reflector array in the corresponding S1 of time for exposure controller zone is set to non-reflection position, continue to press the time exposure of T2-T1, arrive this time, then be set to non-reflection position by the micro-reflector work pixel in the DMD micro reflector array in the corresponding S2 of time for exposure controller zone again, the time that T3-T2-T1 is pressed in continuation, finish to close electron exposure up to this time for exposure, stop the photogenerated charge integration, the view data of output target subject.Another kind method is: earlier to the regional time exposure of pressing T3-T2-T1 of S3, then to S3 and the regional time exposure of pressing T2-T1 of S2, at last S3, S2, S1 (full frame) are pressed the time exposure.The state position of the micro-reflector work pixel in the DMD micro reflector array of corresponding region is adjusted in each exposure by the time for exposure controller.
Claims (2)
1. digital optical imaging system, it is characterized in that: it is made up of optical imaging lens group, DMD micro reflector array, ccd image sensor, time for exposure controller, Digital Image Processor and controller, described controller is provided with two data channel interfaces, wherein one is connected with the video output terminals of Digital Image Processor by video interface, and another is connected with the control end of Digital Image Processor by control interface; Two outputs of described Digital Image Processor are connected with the input of time for exposure controller and the VT of ccd image sensor respectively; Two outputs of described time for exposure controller, output signal control DMD micro reflector array and ccd image sensor respectively.
2. the formation method of a digital optical imaging system, it is characterized in that: when the work pixel in the DMD micro reflector array all is in opening, the optical imaging lens group is passed through the DMD micro reflector array with target subject, pre-imaging is to ccd image sensor, after handling, image processor is input to imaging controller, by image processing software this image is divided into several regions according to different actual light brightness, determine the corresponding required exposure parameter in each zone, output signal to the time for exposure controller through Digital Image Processor, work pixel in the control DMD micro reflector array is in the time of unlatching or closed condition, once more target subject is passed through the DMD micro reflector array, imaging obtains digital image to ccd image sensor after image processor is handled.
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Cited By (18)
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| CN101902581A (en) * | 2009-03-31 | 2010-12-01 | 索尼株式会社 | Be used to produce the method and the unit of high dynamic range images and frame of video |
| CN102158653A (en) * | 2011-05-03 | 2011-08-17 | 东华大学 | Device and method for acquiring digital image with high dynamic range in real time |
| CN102538757A (en) * | 2011-11-08 | 2012-07-04 | 昆明理工大学 | Method for observing bright source and surrounding dark source targets |
| CN103117733A (en) * | 2013-02-25 | 2013-05-22 | 华东师范大学 | Driving waveform generator for digital micromirror devices |
| CN104301701A (en) * | 2014-11-12 | 2015-01-21 | 四川大学 | Array system of digital mirror device (DMD) capable of randomly turning |
| US9077910B2 (en) | 2011-04-06 | 2015-07-07 | Dolby Laboratories Licensing Corporation | Multi-field CCD capture for HDR imaging |
| CN105137606A (en) * | 2015-10-08 | 2015-12-09 | 哈尔滨理工大学 | Digital-micromirror-device-based stereoscopic vision imaging apparatus and method |
| CN105407294A (en) * | 2015-10-27 | 2016-03-16 | 努比亚技术有限公司 | Image exposure method and mobile terminal |
| CN105847706A (en) * | 2016-04-07 | 2016-08-10 | 广东欧珀移动通信有限公司 | Method and device for dynamically adjusting exposure |
| CN106034209A (en) * | 2016-04-08 | 2016-10-19 | 奇瑞汽车股份有限公司 | Method and device for obtaining video |
| CN106161979A (en) * | 2016-07-29 | 2016-11-23 | 广东欧珀移动通信有限公司 | High dynamic range images image pickup method, device and terminal unit |
| CN106357984A (en) * | 2015-07-16 | 2017-01-25 | 原相科技(槟城)有限公司 | Image processing method and image processing system assigning different gains to different sections |
| CN108683844A (en) * | 2018-05-04 | 2018-10-19 | 清华大学 | The implementation method and device of TDI push-scanning images based on DMD |
| CN110572563A (en) * | 2018-06-05 | 2019-12-13 | 杭州海康威视数字技术股份有限公司 | Modulation weight matrix determining method and device and electronic equipment |
| CN111263080A (en) * | 2020-02-23 | 2020-06-09 | 樊天放 | Gradual exposure method based on line scanning camera |
| CN111279686A (en) * | 2017-11-03 | 2020-06-12 | 高通股份有限公司 | System and method for high dynamic range imaging |
| CN111865677A (en) * | 2020-07-13 | 2020-10-30 | 苏州浪潮智能科技有限公司 | Device for identifying ID address of server node |
| CN115209061A (en) * | 2022-09-15 | 2022-10-18 | 中国人民解放军国防科技大学 | Real-time high-dynamic imaging method and system based on DMD |
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2008
- 2008-08-15 CN CNA2008100211581A patent/CN101360192A/en active Pending
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| CN101902581A (en) * | 2009-03-31 | 2010-12-01 | 索尼株式会社 | Be used to produce the method and the unit of high dynamic range images and frame of video |
| US9549123B2 (en) | 2011-04-06 | 2017-01-17 | Dolby Laboratories Licensing Corporation | Multi-field CCD capture for HDR imaging |
| US9077910B2 (en) | 2011-04-06 | 2015-07-07 | Dolby Laboratories Licensing Corporation | Multi-field CCD capture for HDR imaging |
| CN102158653A (en) * | 2011-05-03 | 2011-08-17 | 东华大学 | Device and method for acquiring digital image with high dynamic range in real time |
| CN102158653B (en) * | 2011-05-03 | 2013-01-16 | 东华大学 | Device and method for acquiring digital image with high dynamic range in real time |
| CN102538757A (en) * | 2011-11-08 | 2012-07-04 | 昆明理工大学 | Method for observing bright source and surrounding dark source targets |
| CN103117733A (en) * | 2013-02-25 | 2013-05-22 | 华东师范大学 | Driving waveform generator for digital micromirror devices |
| CN103117733B (en) * | 2013-02-25 | 2015-08-19 | 华东师范大学 | A kind of Digital Micromirror Device drive waveforms generator |
| CN104301701A (en) * | 2014-11-12 | 2015-01-21 | 四川大学 | Array system of digital mirror device (DMD) capable of randomly turning |
| CN106357984A (en) * | 2015-07-16 | 2017-01-25 | 原相科技(槟城)有限公司 | Image processing method and image processing system assigning different gains to different sections |
| CN105137606A (en) * | 2015-10-08 | 2015-12-09 | 哈尔滨理工大学 | Digital-micromirror-device-based stereoscopic vision imaging apparatus and method |
| CN105407294A (en) * | 2015-10-27 | 2016-03-16 | 努比亚技术有限公司 | Image exposure method and mobile terminal |
| CN105847706A (en) * | 2016-04-07 | 2016-08-10 | 广东欧珀移动通信有限公司 | Method and device for dynamically adjusting exposure |
| CN106034209B (en) * | 2016-04-08 | 2019-02-22 | 奇瑞汽车股份有限公司 | Obtain the method and device of video |
| CN106034209A (en) * | 2016-04-08 | 2016-10-19 | 奇瑞汽车股份有限公司 | Method and device for obtaining video |
| US10616499B2 (en) | 2016-07-29 | 2020-04-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for capturing high dynamic range image, and electronic device |
| CN106161979A (en) * | 2016-07-29 | 2016-11-23 | 广东欧珀移动通信有限公司 | High dynamic range images image pickup method, device and terminal unit |
| US10623654B2 (en) | 2016-07-29 | 2020-04-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for capturing high dynamic range image, and electronic device |
| CN111279686A (en) * | 2017-11-03 | 2020-06-12 | 高通股份有限公司 | System and method for high dynamic range imaging |
| CN111279686B (en) * | 2017-11-03 | 2021-05-14 | 高通股份有限公司 | System and method for high dynamic range imaging |
| CN108683844B (en) * | 2018-05-04 | 2020-06-19 | 清华大学 | Method and device for realizing TDI push-broom imaging based on DMD |
| CN108683844A (en) * | 2018-05-04 | 2018-10-19 | 清华大学 | The implementation method and device of TDI push-scanning images based on DMD |
| CN110572563A (en) * | 2018-06-05 | 2019-12-13 | 杭州海康威视数字技术股份有限公司 | Modulation weight matrix determining method and device and electronic equipment |
| CN110572563B (en) * | 2018-06-05 | 2021-10-15 | 杭州海康威视数字技术股份有限公司 | Modulation weight matrix determining method and device and electronic equipment |
| CN111263080A (en) * | 2020-02-23 | 2020-06-09 | 樊天放 | Gradual exposure method based on line scanning camera |
| CN111865677A (en) * | 2020-07-13 | 2020-10-30 | 苏州浪潮智能科技有限公司 | Device for identifying ID address of server node |
| US11646949B2 (en) | 2020-07-13 | 2023-05-09 | Inspur Suzhou Intelligent Technology Co., Ltd. | Server node ID address recognition device |
| CN115209061A (en) * | 2022-09-15 | 2022-10-18 | 中国人民解放军国防科技大学 | Real-time high-dynamic imaging method and system based on DMD |
| CN115209061B (en) * | 2022-09-15 | 2022-12-16 | 中国人民解放军国防科技大学 | Real-time high-dynamic imaging method and system based on DMD |
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