CN102679905A - Pixel-level self-adaptive digital optical brightness attenuation method and attenuation device - Google Patents
Pixel-level self-adaptive digital optical brightness attenuation method and attenuation device Download PDFInfo
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- CN102679905A CN102679905A CN2012100069192A CN201210006919A CN102679905A CN 102679905 A CN102679905 A CN 102679905A CN 2012100069192 A CN2012100069192 A CN 2012100069192A CN 201210006919 A CN201210006919 A CN 201210006919A CN 102679905 A CN102679905 A CN 102679905A
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Abstract
The invention relates to the image processing and vision detection technology. In order to adapt to different optical measurement environments, solve the oversaturation phenomenon of the exposure in the image and optimize the quality of an image collected by an image sensor, the invention adopts the technical scheme that a pixel-level self-adaptive digital optical brightness attenuation device comprises an image sensor, an image collection card, a self-adaptive digital optical brightness attenuator and a data processing computer, wherein the image sensor is used for acquiring an original image of an object to be measured; the image collection card is used for transmitting the original image to the data processing computer; and the self-adaptive digital optical brightness attenuator is arranged between the object to be measured and the image sensor, is connected with the computer and is used for adjusting the image of the object to be measured according to the control of the computer and for outputting the adjusted image of the object to be measured to the image sensor. The pixel-level self-adaptive digital optical brightness attenuation method and the attenuation device are mainly applied to the extraction of tongue information.
Description
Technical field
The present invention relates to Flame Image Process, vision detection technology, especially relate to Pixel-level adaptive digital optical brightness damped system and attenuator.
Background technology
IMAQ is as the key link of optical measuring system; Good image quality can be simplified the Flame Image Process and the computing in later stage; Improve the speed and the success ratio that detect; And image quality, the picture quality of subsequent software normal process influences the processing of subsequent software even Digital Image Processing mode such as the recovery through image, enhancing, equalization also can't be guaranteed.
Use in the process of imageing sensor images acquired,, cause the image local exposure supersaturation that collects usually because the influence of factors such as environment and testee Facing material, structure, degree of roughness distribution will make catoptrical strength difference excessive.In order to improve the picture quality that collects; Usually increase the mode of special simulated optical filtering at the front end of image collecting device; Make the image that collects have striking contrast degree and brightness, thereby simplify the Flame Image Process and the computing in later stage, improve measured speed and success ratio.Can only carry out integral body improvement to the light conditions in zone to IMAQ for the method for simulated optical filtering, can't accurately control for the brightness of each pixel of images acquired.
Summary of the invention
The present invention is intended to solve the deficiency that overcomes prior art; Through a kind of Pixel-level adaptive digital optical brightness damped system and attenuator; Replace the simulated optical filtering mode; Can adapt to various optical measurement environment, solve the oversaturated phenomenon of exposure in the image, the picture quality that imageing sensor is collected is optimum.For achieving the above object, the technical scheme that the present invention takes is that Pixel-level adaptive digital optical brightness attenuating device comprises:
Imageing sensor is used to obtain the original image of testee;
Image pick-up card is used for being sent to data handling machine to original image;
Adaptive digital optical brightness attenuator is arranged between testee and the imageing sensor, and links to each other with computing machine, is used for according to the control of computing machine the testee image being adjusted, and adjusted testee image is outputed to imageing sensor;
Data handling machine; Be used for original image is estimated; Calculate initial adaptive digital optical brightness attenuator initialization template data is set, digital optical attenuator is provided with, the original image of the testee that obtains through imageing sensor behind the adaptive digital optical brightness attenuator is estimated once more; And calculate adaptive digital optical brightness attenuator once more template data is set; Digital optical attenuator is provided with,, collects the optimal quality image through repeatedly feeding back iteration.
Adaptive digital optical brightness attenuator comprises:
Object lens are used for testee is formed images;
Polarization beam splitter prism, the picture of the testee that is used for object lens are obtained is shown to the LCoS chip, behind the light transmission polarization beam splitter prism of LCoS chip reflection, forms images on imageing sensor through image-forming objective lens; Adaptive digital optical brightness attenuator links to each other with computing machine and is meant, computing machine is controlled the catoptrical intensity of each pixel on the LCoS chip through digital programmable logic control plate, with the brightness of control LCoS chip reflection back image.
Digital programmable logic control plate is made up of Computer Communications Interface, two buffer memory, PLD, clock phase-locked loop, power management module; PLD reads controlled variable and is input to the LCoS chip from one of them buffer memory according to the system clock of clock phase-locked loop output; Reflected light parameter to each pixel of LCoS chip drives; Computing machine upgrades the LCoS chip template data of another buffer memory through communication interface; After the Data Update of buffer memory is accomplished; Send instruction to logic control device, switch buffer memory, make FPGA drive from the memory fetches input LCoS chip of firm renewal.
Pixel-level adaptive digital optical brightness damped system is realized by means of aforementioned pixel level adaptation digit optical brightness decay device, and is comprised the following steps:
Use imageing sensor to obtain the original image of testee; Be sent to original image in the data handling machine through image pick-up card; Adopt the image quality evaluation algorithm in the automatic adjustment algorithm software of pixel intensity that original image is estimated; Calculate initial LCoS chip initiation template data is set, through adaptive digital optical brightness attenuator is provided with; Imageing sensor is gathered the testee image after the adjustment of adaptive digital optical brightness attenuator once more then; Be sent to data handling machine once more and carry out the calculating of image auto brightness adjustment algorithm once more; Thereby the LCoS chip that obtains is provided with template data; Be used for digital optical brightness attenuator is reset,, finally collect the image of optimal quality through repeatedly feeding back iteration.
The present invention has following technique effect: the present invention adopts the core component of high-resolution LCoS as the Pixel-level brightness regulation; Form the optical brightness attenuator with polarization splitting prism and corresponding camera lens; The optical brightness attenuator is installed in the video camera front end of original measuring system, need not change original measuring system structure.Special-purpose LCoS drive system, image collecting device and the automatic adjustment algorithm of brightness are formed a close-loop feedback control system; Can regulate the brightness of each pixel of the image that collects; In vision measurement, can avoid because the image quality decrease that factors such as environment and measured object structure cause, improve the quality of image.Through special LCoS control data is set, can strengthen the picture quality of part interested in the image, for example in the 3D optical measurement, can give prominence to enhancing to structure light image, non-measure portion is carried out filtering.
Description of drawings
Fig. 1 system structure model.Among the figure: 1. 2. 3. digital programmable logic control plate, 4. illuminator, 5. imageing sensor, 6. camera lens, 7. digit optical attenuator, 8. testee of image pick-up card of data handling machine.Digit optical brightness decay device structure that Fig. 2 Pixel-level is adjustable.Among the figure: 9. polarization beam splitter prism; 10. LCoS chip;
object lens,
image-forming objective lens.
Fig. 3 system control flow.
Fig. 4 algorithm flow.
Embodiment
Pixel-level image brightness adaptive digital optical brightness attenuator can accurately be regulated the brightness of each pixel of the image gathered, replaces the simulated optical filtering mode, can adapt to various optical measurement environment.
The present invention adopts the adaptive digital optical brightness attenuator that can regulate arbitrarily the brightness of each pixel of images acquired of high resolving power liquid crystal on silicon (LCoS) design.Under the constant situation of original measuring system structure, at the front end of image sensor apparatus digit optical brightness decay device is installed, and imageing sensor is connected with computing machine, form a feedback control system.The image that computing machine collects according to imageing sensor; Through the pixel intensity adaptive algorithm digital optical brightness attenuator is carried out FEEDBACK CONTROL; Adjustment digit optical brightness decay device is to the parameter of each pixel intensity; Optimize image quality solves the oversaturated phenomenon of exposure in the image, makes things convenient for the processing of subsequent calculations machine data process software.
The present invention is through the automatic adjustment algorithm software of design pixel intensity; Use the picture appraisal function that the brightness of each pixel of the image that collects is automatically adjusted; The accurate yield value of each brightness of control images acquired is adjusted to the brightness of the HDR in space within the dynamic range of video camera.Yield value according to brightness carries out gamma correction to the image that imageing sensor collects simultaneously, obtains the Luminance Distribution of true measured zone, so that follow-up measurement is calculated.
The present invention forms the optical brightness attenuator by high-resolution liquid crystal on silicon LCoS, spectroscope, polaroid, image conversion lens; The special-purpose driving circuit of design LCoS uses imageing sensor, image pick-up card and data processing software to form feedback control system.
Overall system structure is as shown in Figure 1.5. imageing sensor is that gamma camera obtains the 8. original image of testee; Be sent to data processing to original image 1. in the computing machine through 2. image pick-up card; Adopt the image quality evaluation algorithm in the automatic adjustment algorithm software of pixel intensity that original image is estimated; Calculate initial LCoS initialization template data is set, 7. digit optical attenuator is provided with through 3. digital programmable logic control plate.Imageing sensor is gathered the testee image after 7. the digit optical attenuator is adjusted once more then; Be sent to data handling machine once more and carry out the calculating of image auto brightness adjustment algorithm once more; Thereby the LCoS that obtains is provided with template data, is used for digital optical brightness attenuator is reset.Through repeatedly feeding back iteration, finally solve the oversaturated phenomenon of exposure in the image like this, the picture quality that imageing sensor is collected is optimum.
Pixel-level is adjustable, and digit optical brightness decay device structure is as shown in Figure 2.
object lens are to 8. testee imaging; Be shown to 10. on the LCoS chip through the 9. picture of polarization beam splitter prism testee; Through 1. FPGA plate the catoptrical intensity of each pixel on the 10. LCoS chip is controlled the brightness of adjustment image after 10. the LCoS chip reflects., 6. formed images on the imageing sensor 9. behind the polarization beam splitter prism by the light transmission of 10. LCoS chip reflection through
image-forming objective lens.Use Pixel-level adjustable optical brightness decay device to realize adjusting, can realize the automatic adjusting of the brightness of images acquired through the automatic adjustment algorithm of brightness of image each pixel intensity of images acquired.
LCoS driving circuit principle is as shown in Figure 3.Form by circuit modules such as Computer Communications Interface, two buffer memory, PLD, clock phase-locked loop, power managements.PLD reads controlled variable and is input to the LCoS from one of them storer according to system clock, and the reflected light parameter of its each pixel is driven.Computing machine upgrades the LCoS template data of another storer through communication interface.After the Data Update of storer is accomplished, send instruction, switch buffer memory, make FPGA drive from the memory fetches input LCoS of firm renewal to logic control device.
The automatic adjustment algorithm software flow of computing machine Pixel-level brightness is as shown in Figure 4.Behind the camera acquisition image picture quality is estimated, can be stopped if meeting optical measurement subsequent software treatment requirement.If picture quality is undesirable, according to the picture appraisal standard, use the automatic adjustment algorithm of brightness that the image of gathering is calculated again, obtain LCoS data are set.Through Computer Communications Interface the LCoS template data is upgraded, carry out IMAQ again.Through repeatedly gather, the renewal of calculating and LCoS template data, finally collect and obtain the optimal image quality, so that follow-up measurement is calculated.
The present invention adopts the core component of high-resolution LCoS as the Pixel-level brightness regulation; Form the optical brightness attenuator with polarization splitting prism and corresponding camera lens; The optical brightness attenuator is installed in the video camera front end of original measuring system, need not change original measuring system structure.Special-purpose LCoS drive system, image collecting device and the automatic adjustment algorithm of brightness are formed a close-loop feedback control system; Can regulate the brightness of each pixel of the image that collects; In vision measurement, can avoid because the image quality decrease that factors such as environment and measured object structure cause, improve the quality of image.Through special LCoS control data is set, can strengthen the picture quality of part interested in the image, for example in the 3D optical measurement, can give prominence to enhancing to structure light image, non-measure portion is carried out filtering.
At the front end of original optical measuring system imageing sensor pixel-level image brightness self-adaptation adjustment optical brightness attenuator is installed, Pixel-level brightness regulation algorithm software is installed on the computing machine, connect LCoS control panel and Computer Communications Interface.Video camera is taken the testee image in the measuring process; After the brightness regulation algorithm software is estimated measurement image, the controlled variable of LCoS is set, the brightness of measured object subject image is regulated; Satisfy the dynamic range that video camera is taken, obtain the optimal image quality.According to the controlled variable of LCoS, video camera is taken the image that obtains carry out gamma correction, obtain meeting the measurement image that measured object object intrinsic brilliance distributes, so that subsequent optical is measured.
Claims (4)
1. a Pixel-level adaptive digital optical brightness attenuating device is characterized in that, comprising:
Imageing sensor is used to obtain the original image of testee;
Image pick-up card is used for being sent to data handling machine to original image;
Adaptive digital optical brightness attenuator is arranged between testee and the imageing sensor, and links to each other with computing machine, is used for according to the control of computing machine the testee image being adjusted, and adjusted testee image is outputed to imageing sensor;
Data handling machine; Be used for original image is estimated; Calculate initial adaptive digital optical brightness attenuator initialization template data is set, digital optical attenuator is provided with, the original image of the testee that obtains through imageing sensor behind the adaptive digital optical brightness attenuator is estimated once more; And calculate adaptive digital optical brightness attenuator once more template data is set; Digital optical attenuator is provided with,, collects the optimal quality image through repeatedly feeding back iteration.
2. device as claimed in claim 1 is characterized in that, adaptive digital optical brightness attenuator comprises:
Object lens are used for testee is formed images;
Polarization beam splitter prism, the picture of the testee that is used for object lens are obtained is shown to the LCoS chip, behind the light transmission polarization beam splitter prism of LCoS chip reflection, forms images on imageing sensor through image-forming objective lens; Adaptive digital optical brightness attenuator links to each other with computing machine and is meant, computing machine is controlled the catoptrical intensity of each pixel on the LCoS chip through digital programmable logic control plate, with the brightness of control LCoS chip reflection back image.
3. device as claimed in claim 1; It is characterized in that; Digital programmable logic control plate is made up of Computer Communications Interface, two buffer memory, PLD, clock phase-locked loop, power management module; PLD reads controlled variable and is input to the LCoS chip from one of them buffer memory according to the system clock of clock phase-locked loop output, and the reflected light parameter of each pixel of LCoS chip is driven, and computing machine upgrades the LCoS chip template data of another buffer memory through communication interface; After the Data Update of buffer memory is accomplished; Send instruction to logic control device, switch buffer memory, make FPGA drive from the memory fetches input LCoS chip of firm renewal.
4. Pixel-level adaptive digital optical brightness damped system; It is characterized in that; Pixel-level adaptive digital optical brightness damped system is realized by means of aforementioned pixel level adaptation digit optical brightness decay device, and is comprised the following steps: to use imageing sensor to obtain the original image of testee; Be sent to original image in the data handling machine through image pick-up card; Adopt the image quality evaluation algorithm in the automatic adjustment algorithm software of pixel intensity that original image is estimated, calculate initial LCoS chip initiation template data is set, through adaptive digital optical brightness attenuator is provided with; Imageing sensor is gathered the testee image after the adjustment of adaptive digital optical brightness attenuator once more then; Be sent to data handling machine once more and carry out the calculating of image auto brightness adjustment algorithm once more; Thereby the LCoS chip that obtains is provided with template data; Be used for digital optical brightness attenuator is reset,, finally collect the image of optimal quality through repeatedly feeding back iteration.
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| CN106053025A (en) * | 2016-06-30 | 2016-10-26 | 河南科技大学 | Measuring device and method for Airy beam attenuation factor |
| CN106782367A (en) * | 2016-12-15 | 2017-05-31 | 浙江宇视科技有限公司 | Liquid crystal-spliced screen shows method and system |
| CN111964605A (en) * | 2020-07-22 | 2020-11-20 | 深圳市联赢激光股份有限公司 | Workpiece three-dimensional surface type detection system and method |
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| CN111964605A (en) * | 2020-07-22 | 2020-11-20 | 深圳市联赢激光股份有限公司 | Workpiece three-dimensional surface type detection system and method |
| CN112348761A (en) * | 2020-11-30 | 2021-02-09 | 广州绿怡信息科技有限公司 | Equipment appearance image brightness adjusting method and device |
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Application publication date: 20120919 |