TW200420999A - Auto-focusing system - Google Patents

Auto-focusing system Download PDF

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Publication number
TW200420999A
TW200420999A TW92108162A TW92108162A TW200420999A TW 200420999 A TW200420999 A TW 200420999A TW 92108162 A TW92108162 A TW 92108162A TW 92108162 A TW92108162 A TW 92108162A TW 200420999 A TW200420999 A TW 200420999A
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Taiwan
Prior art keywords
image
optical axis
control logic
value
brightness
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TW92108162A
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Chinese (zh)
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TW573207B (en
Inventor
xian-zhong Liu
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Tekom Technologies Inc
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Publication of TW200420999A publication Critical patent/TW200420999A/en

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Abstract

The present invention provides an auto-focusing system, which includes an image sensing device, a control logic device, a focus adjustment device and an output device. The invention is characterized in using the control logic device to determine positions for several adjacent optical axes on an optical axis of an image capturing lens, and selecting several reference points in the image, so as to respectively obtain brightness corresponding to each reference point of each optical axis, thereby performing a statistic brightness correlation for each optical axis position. When finding a maximum for the sum of the image brightness correlation of one optical axis position and another optical axis position, the control logic device determines this optical axis to be a focused position. Therefore, it is able to decrease the influence of noise, increase the tolerance to image noise and extend the focus length via a numerical method.

Description

V. Description of the invention (1) [Technical field to which the invention belongs] I This article is about an automatic J-value of the position of each optical axis of the series element: system, analysis, to effectively achieve the focus meter science [previous technology 】 Two general AF systems are one of them. The conventional automatic confrontation or photography ratio) is used as the focus evaluation value. ',,,,; j means the position of each focusing lens is used, and g = the level of the difference in dynamic focusing lens. The best focus is the light-dark pair of $ [Content of the Invention] "Problems to be Solved" In the automatic confrontation described in W, when the image noise is low: ㈡: The light-dark pair is when the message is high to-a certain degree The ratio will be disturbed by noise, which means that the signal can effectively distinguish the focus distance in a low-light environment, so the distance is shorter. c

Mainly through a control logic correlation (c 〇rre 1 ati ο η machine, the indispensable power-dark contrast value (contrast film, one by one evaluation of the reference image lighting ratio of adjacent images, and the light-dark contrast ratio ratio When focusing is high, it is quite effective; but when the noise ratio is low, light and dark are the best focus position. Usually it is difficult to focus, and therefore, the present invention is based on light.

200420999 —- ^ V. Description of the invention (2) About the limitations of the autofocus system of the method of the present invention and the lack of the self-made logic elements and _ series elements of the present invention. Calculate the optical axis position of the two pairs of optical systems and other control logic components. The image of the moving focus focusing device has the axis position opposite to the optical axis point and the optical axis position. This light is analyzed by statistical correlation (correlation) analysis. One or even several of the aforementioned related technology systems include: Testing device, a control device and an output element. It determines a number of fixed reference points in the control logic and controls the position change in the direction, and simultaneously captures the image to obtain the corresponding brightness value. Then, the correlation of the image brightness value between the control logic elements is used to When the correlation of the brightness value of an image is found to be the largest, the axis position is determined as the position where the focusing is completed. "Effects compared to the prior art" 1 · Ben ^ Ming "$ 本: Month autofocus system 'which can achieve the following effects: back and forth 前后 t uses a statistical correlation method, with ^ a: ^ 2 set The statistical correlation of the image is an evaluation value, which can reduce the noise level, >, shirt ringing, and extend the focusable distance through numerical methods. 2. When the image noise is large enough, focus position before and after The advantages of image unification " ten correlation are mathematically to strengthen the original image information and at the same time allow the noise with random characteristics to cancel each other out. Therefore, the tolerance of image noise is greatly improved. Those skilled in the art will understand the purpose, features and effects of the present invention. The present invention will be described in detail below with reference to the following specific embodiments and the accompanying drawings.

200420999 V. Description of Invention

[Embodiment] The second test figure is a diagram showing the components of the embodiment of the autofocus system of the present invention, which can be installed in a digital imaging system and includes at least an image sensing device (1), a control A logic element (2), a focusing device (3), and an output element (4). The image sensing device (1) is mainly composed of an imaging lens group (11) and an imaging lens (1 2). 5 The imaging lens group (11) is an image capturing lens structure that collects incident light. The element (1 2) is a photosensitive horseshoe element that can sense incident light and generate a signal. Month;] the image capturing element (1 2) can convert the incident image light source into red, blue, and green three primary color lights corresponding to r, B, G, and mixed light brightness values through process photoelectricity. The control logic element ( 2) It is a logic operation circuit element, which can perform proper logic and difference on the distribution of r, b, G and mixed light intensity values provided by the aforementioned image capturing element (12) to determine the clarity of the captured image It means to judge whether the image pickup position of the image pickup element (丨 2) of the image sensing device (1) falls on the focal length position of the image pickup lens group (11). The focusing device (3) can control the result of determining the sharpness of the captured image according to the control logic element (2), and control the image capturing position of the image capturing element (1 2) of the image sensing device (1). It falls on the focal length position of the imaging lens group (丨 丨). The output element (4) is a data storage circuit element, which can store the actual image r, b, G, and mixed brightness values determined by calculation by the aforementioned control logic element (3) to provide clear data output of the actual image. ^ Mouth

200420999

One of the embodiments of the system. —N ····· 11 '— ^ | — | · | _ _ V. Description of the invention (4) $ The first diagram is a flowchart showing the autofocus of the present invention, and its steps are at least Including: 勖 Focus system ^ & 1 0 'This system uses the image sensing to obtain a wide range of image light sources penetrating the imaging lens group (11). The initial position is stored as PX (〇), and the image pickup lens group (11) decides several position reference points of the selected image (according to this, j control logic element (2) = 1 ~ η, η is determined by The number of selected position reference points ^ is determined as Pi position, i is the mixed brightness value of red, blue, and green, and each bit is 疋), and the corresponding Gi (0) is obtained; For step 20, the control logic element (2) fetches the imaging lens group (11) from the initial position PX (0) along the focusing device (3), makes the new optical axis position PX⑴, and calculates each heart rate 量 2 Set PK1) and then advance a feed amount along the optical axis to reach the output value and store; Ϊ Ρχ (2) 'Asia will store the mixed photometric value of each image reference point P1 position and store it as Gi (2), and finally from Set ρχ (2) and then advance a feed 沿着 along the optical axis to reach the new optical axis position ρχ (3), and store each image reference point with a bitwise mixed light intensity value and store it as G i (3); Step 30: Calculate the image capturing lens group (丨 丨) wider than PX (1) and PX (0), PX (1) and PX (2), and PX (2) and ρχ through the control logic element (2). (3) Correlation of the mixed luminance values (c 〇rre 1 ati 〇η) of the position of each image reference point P i when the optical axis position is stored as R (〇1), R (1 2), and R (23), respectively, and Defined as the product of the dispersion: R (〇l) = Sum {[Gi (l)-Gav (l)] * [Gi (0) — Gav (O)]}; R (12) = Sum {[Gi (l)-Gav (l)] * [Gi (2) — Gav (2)]}; and

200420999 V. Description of the invention (5) R (23) = Sum {[Gi (2) — Gav (2)] * [Gi (3) ~ Gav (3)]}; and regarding the optical axis position PX (1) The correlation between the average brightness value of PX and PX (2) is defined as:

Rav (l) = [R (01) + R (12)] / 2; and

Rav (2) = [R (12) + R (23)] / 2; where G l (0), G l (1), Gi (2), and Gi (3) are for different optical axis positions 'The mixed brightness values corresponding to the positions of the reference points Pi of all images, Gav (0), Gav (l), Gav (2), and Gav (3) are for different light axis positions, all $ ^ test point P i position mixed brightness The average number of values; Step 40, judge through the control logic element (2), if it is Rav (2) >

Ra v (1) 'then enters step 50, otherwise proceeds to step 6 and step 50, the optical axis positions PX (1) and PX (2kPX (3) are respectively stored as new pxu) through the control logic element (2) , PX (1) and ρχ (2), and the luminance values Gi (1), G 1 f

= To Gi (〇), -Gl⑴, and Gl (2), and then from the optical axis position ρχ⑺ again (along with I: Si Ϊ: ΐ:: ί Ϊ the optical axis position PX (3), and each image parameter ^ This a-light-free value at position Pl is stored as a new Gi (3), and the process proceeds to step

Set step 6 0 'The control logic element f 9, face ^ it ^ ^ # (4 ^ V' ^ ^ ^ In the previous step 2. Take the i round or on the imaging lens group ⑴)- The position ρχ⑷ must be at the starting position mm in the focus position of the focus lens group (^ Ji Zhixin 恻).

Page 9 200420999 ............. V. Explanation of the invention (6) Tong Xi m ,, f, ⑴ ⑴ ⑴ The fourth ⑻ figure shows another example of the yoke of the automatic pairing of the present invention. The focusing flowchart includes the following steps at least: ..., step 1 〇1. It uses the image sensing device to capture the image light source penetrating the image capturing lens group (丨 i). 12) The initial position on the optical axis is stored as PX (0), and the% group (11) (2) is used to determine the number of position reference points for the image. η is determined according to the number of selected position reference points ... set, 1 or advance =. Via the control logic element, it is randomly determined to enter step ㈣ Step 103, judged by the control logic element (2), if step 2 0 0 Go to step 30 0 to 200, or continuously perform step-by-step, ^, and go 200 to 300, then go to step 104, otherwise go to step i 0 to step 104 ', the control logic element (2) will ρχ (1) judges the position, and outputs or stores the captured focus position through the output element (4). Step 105, the optical axis position P × (2) is obtained through the control logic element (2). ) And PX (1) are stored as new optical brothers, and (11) PX (1); ”4 of the glaze position PX (〇) and step 106, again using the control logic element (2) to determine-set If PX (〇) is greater than PX (1), proceed to step 300, otherwise enter the right optical axis position. The initial position of the imaging lens group (11) described in step 10 above is at any optical axis position, which means that the image is taken. The beginning of the lens group (丨 i) is any position that can be located on either side of its focal position. σ position PX (0

200420999 V. Description of the invention (7) The step 2 0 0 described in W is subdivided into steps 2 01 to 2 04, which are: Step 2 01, the control avoidance element (2) controls the focusing device (3), so that the imaging lens group (1 1) advances from the optical axis position PX (0) by a feed amount along the optical axis to reach a new optical axis position PX (1) 'and mixes the positions of each P i The brightness value is stored as G 1 (1) 'Then it advances from the position PX (1) along the optical axis by a feed amount to reach the new optical axis position PX (2), and positions each image reference point p 丨The value of the mixed brightness is stored as Gi (2); Step 2 02, through the control logic element (2), calculate that the imaging lens group (11) is in PX (0) and PXU) and PX (〇) and PX (2) At the position of the optical axis, the correlation (c0rrelat 丨 ⑽) of the mixed optical immunity value at the position of the reference point Pi of each image is stored, and the correlation is stored as R (0 1) and R (0 2) ' The calculation system is defined as: R (01) = Sum {[Gi (0)-Gav (0)] * [Gi (1)-Gav (l)]}; and R (02) = Sum {[Gi ( 〇)-Gav (0)] * [Gi (2)-Gav (2)]}; where Gi (0), Gi (1) and Gi (2) are for different optical axis positions , The mixed brightness values corresponding to the Pi positions of all the images, Gav (〇), Gav (l), and Gav (2) are the average values of the mixed brightness values of all image reference points p 丨 at different optical axis positions Step 2 0 3 'Judge through the control logic element (2), if it is r (〇2) > R (0 1)' then go to Step 2 04, otherwise go back to Step 1 0 3; Step 2 0 4 'Through the control logic element (2), the optical axis positions PX (1) and PX (2) are stored to ρχ (〇) and ρχ (1), respectively, and the mixed brightness value Gidk G i (2) is stored to g 丨 (〇) and gi (1), then advance from the optical axis position PX (2) along the # optical axis by a feed amount to reach the new optical axis position ρχ (2), and

200420999 V. Description of the invention (8) The mixed light intensity value at the test site Pl is stored as a new step (step 202). The child step into step 3 0 0 described above is subdivided into step 3001 to step 304, which In step 301, the control logic element (2) controls the focusing device (3), so that the lens group UU is retracted from the optical axis position PX (0) by a feed amount along the optical axis to reach the optical axis position PX (U, and store the mixed brightness value of each Pl position and store G 1 (1), and then retreat from the position ρχ (1) by a feed amount along the optical axis to reach the new optical axis position PX (2) , And save the mixed value of the position of each image reference point p 丨 as Gi (2); ^ Step 3 0 2, the image capturing lens group (丨 1) is performed through the control logic element (2), which is at PX (0) ) And PX (1) and PX (0) and PX (2) optical axis positions, the correlation of the photon intensity value at the position of each image reference point P i (c 〇rere 1 at 丨 〇n) and stored separately Are R (〇l) and R (02), and the correlation calculation is defined as: R (01) = Sum {[Gi (〇)-Gav (0)] ^ [Gi (1)-Gav (l) ]}; And R (〇2) = Sum {[Gi (〇)-Gav (0)] ^ [Gi (2)-Gav (2)]}; where G l (〇), G i (1), and G i ( 2) It refers to the mixed brightness values corresponding to the positions of all image reference points Pi under different optical axis positions. Gav (O), Gav (l), and Gav (2) refer to all image reference points under different optical axis positions. p 丨 the average number of position mixed acceptance values; step 3 0 3, judged by the control logic element (2), if it is R (0 2) > R (〇1) ', then go to step 3 〇 04, otherwise Step 1 〇3;

Step 30 4. Through the control logic element (2), the optical axis positions PX (1) and PX (2) are stored to ρχ (〇) and ρχ (1), respectively, and the mixed light intensity value Gi (iM

200420999 ^ .................. ^ „|||||| r. V. Description of the Invention (9) ^ (2 /) Are stored to Gi (0) and Gi (1) respectively, then from the optical axis position ρχ (2), and then back along the & two axes by a feed amount to reach the new optical axis position (2), and each image The mixed brightness value at the test point Pi position is stored as step 3 0.2. In the foregoing step, the control logic element (2) controls the focusing device 3 to advance the imaging lens group (11) along the optical axis. Or back a feed amount, and this feed amount is an integer multiple of the minimum accuracy of the focusing device (3). In the aforementioned step, the control logic element (2) can make all of the aforementioned image capturing element (1 2) The actual pixel is used as the image reference point p. In the above-mentioned steps, the brightness value of the control logic element (2) can be red and blue: this: the value of light intensity or other color-transformed ones that have the physical meaning of brightness In the steps just described, fine adjustment of the entire lens of the image pickup lens group (11) of the image sensing device through the 焦 focusing device (3), or focusing through the commonly used inner ΐ ΓΓΓ1 " 1 f〇 CUSing) or rear focus system retr〇-focusing) micro = image pickup lens of the sensing device (1), part of the lens at address (u), to change the imaging surface of the j acquisition image το piece (1 2) ^ ^ ^ The purpose of the relative focus of the focal point formed by the camera lens group (11) .... 12) the imaging surface 'to achieve the above steps, mainly through Y ^ L ,,,. ^ ≫ The control logic element (2) analyzes the statistical correlation (nine _ vc ◦rre 1 a 11 〇) of each optical axis position to determine whether the imaging lens group (1 1) moves forward or backward, and Those who effectively achieve the purpose of focusing. Although the present invention has been described in a specific embodiment, the invention is limited to anyone, anyone who knows this technique ^ ^ Road as above, but its Asian and African use J ... π Without departing from the spirit of the invention and

200420999

Page 14

200420999 Brief description of the drawings The first diagram is a diagram showing the components associated with the embodiment of the autofocus system of the present invention. The second figure is a flowchart showing the focus of one embodiment of the autofocus system of the present invention. The third figure is an overall flowchart showing an autofocus system of the present invention. The fourth (A) figure is a partial flowchart showing the autofocus system of the present invention. The fourth (B) figure shows another partial flowchart of the autofocus system of the present invention. [Description of component symbols] Image sensing device (1) Image taking lens group (11) Image taking component (1 2) Control logic component (2) Focusing device (3) Output component (4)

Claims (1)

  1. 200420999 — · — The calculation method of the focus judgment of the dynamic focus system includes at least the following steps. One step: i1) determine a fixed number of Yuan test points in the captured image through a control logic element; ^ (2 ^ Hai control logic element controls the change of the image pickup lens group along its optical axis direction, And capture the image at each optical axis position to obtain the brightness value corresponding to the reference point of each image determined in the previous step; clip the logic element to obtain the image brightness of each optical axis position. 1 (c〇rrelat1〇 n) ^^ ^ atf ^ ^ The correlation between the image values of the shirt; Γ The two control logic elements repeat the previous steps, and gradually calculate the relevance of the image brightness value. /…, The image brightness value phase of other optical axis positions = control logic element judges that the optical axis position is complete 2 = special: the image brightness value of the automatic focus system control element described in the application scope Calculate the phase of each optical axis with the previous optical axis ;: f: 'is a stepwise phase f: sum the correlation between the brightness values of the two images to ::; ^ ^ ^ ^ One piece judges the position of this optical axis as focusing : " HAI Dagger System Series 3. According to the first or second scope of the patent application, multiply the deviation of the image brightness value by the same-image reference point position = the described autofocus system, and The sum of the set and captured shadow lines is the correlation between the product of j ^ shirt test points at two different optical axis positions and the brightness value of the shirt image.
    / 、、 clarify patent scope
    4. According to the patent application & a Γ σ Moonburst p, the brightness value selected by the control logic element 1 or item 2 of the control logic is the red and blue of the image. Green mixed light value. The calculation method of the brightness-focusing dynamic focusing system that represents the physical significance of the shirt conversion. The first focus judgment calculation method includes at least the following steps: 1) A control logic is used to soften the position of an optical axis, and an element is used to obtain an image lens group. The three series of components on the optical axis that are determined to be adjacent are selected in the image ^ and stored as ρχ (0), ρχ (υ and ρχ (2). When this control logic is performed, several reference points of each reference point # are obtained and obtained in each light. The position of the axis (2) is matched by the control logic? The value of the light output, (3) The control logic element *, the correlation between the brightness values of the two groups of test points; With its small precision, the Jiao Yi is set to move a feed amount, and at the same time ^ move the same feed amount in the direction of increasing correlation between the shell degree value of the test point, and the two optical axis positions are also in the same direction. The mobile phase (the control ㈣ ^ 4 is stored as _), ρχP, and PX (2); the direction of the increase in the relationship is lost /. Su (2), until the original reference point brightness value photo element judges PX⑴ as, When the test point reaches a 1-degree value, the control logic decreases. 6 According to the scope of the patent application :: system logic element selected two values: the autofocus system 'in which' the other controlled by the color conversion of the blue-green mixed light, and red luminance values or representing the physical meaning of the luminance value of redundancy.
TW92108162A 2003-04-09 2003-04-09 Auto-focusing system TW573207B (en)

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TW200420999A true TW200420999A (en) 2004-10-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106604005A (en) * 2016-12-20 2017-04-26 Tcl集团股份有限公司 Automatic projection TV focusing method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106604005A (en) * 2016-12-20 2017-04-26 Tcl集团股份有限公司 Automatic projection TV focusing method and system

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