WO2017107770A1 - Procédé et dispositif pour corriger une courbe de suivi de zoom - Google Patents

Procédé et dispositif pour corriger une courbe de suivi de zoom Download PDF

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Publication number
WO2017107770A1
WO2017107770A1 PCT/CN2016/108870 CN2016108870W WO2017107770A1 WO 2017107770 A1 WO2017107770 A1 WO 2017107770A1 CN 2016108870 W CN2016108870 W CN 2016108870W WO 2017107770 A1 WO2017107770 A1 WO 2017107770A1
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Prior art keywords
zoom
value
focus
focus position
tracking curve
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PCT/CN2016/108870
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English (en)
Chinese (zh)
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林铁楠
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北京奇虎科技有限公司
奇智软件（北京）有限公司
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Publication of WO2017107770A1 publication Critical patent/WO2017107770A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals

Definitions

  • the present application relates to the field of camera monitoring technology, and in particular, to a method and apparatus for correcting a zoom tracking curve.
  • the existing integrated camera has the functions of zooming and auto focusing, and has a compact structure, convenient use and wide monitoring range, and has been widely used in the field of video surveillance.
  • the zoom lens and the focus lens are separately moved and driven by the zoom motor and the focus motor respectively.
  • zoom tracking is required to synchronize the focus lens according to the position of the zoom lens. Change so that the image can be focused clearly.
  • the lens manufacturer will provide a fixed ideal zoom tracking curve corresponding to the lens, which is convenient for the camera to realize zoom tracking and auto focus according to the zoom tracking curve.
  • the zoom tracking curves of the four different focus distances are substantially coincident; when the zoom magnification becomes larger, different focus distances
  • the zoom tracking curves are gradually separated, and the distances are getting larger and larger. Therefore, the zoom motor is switched from a small magnification to a large magnification, or from a large magnification to a small magnification.
  • the rules for selecting the reference zoom tracking curve should be different accordingly. The selection accuracy of the reference zoom tracking curve is described.
  • the processing is not distinguished for the two different zoom directions.
  • the purpose of the present application is to solve at least the above problems, and to provide a method for correcting a zoom tracking curve and an apparatus using the same.
  • the application provides a method for correcting a zoom tracking curve, which includes:
  • the reference zoom curve is selected from the pre-stored zoom curves with different focus distances to drive the zoom motor and the focus motor according to the reference zoom curve.
  • the correction of the reference zoom tracking curve is completed according to the obtained actual focus position values corresponding to the N collection points.
  • the application also provides a calibration device for a zoom tracking curve, which includes:
  • a reference curve selection module configured to select a reference zoom curve from the pre-stored at least two zoom tracking curves with different focus distances according to the zoom direction and the corresponding preset rule, according to the reference zoom curve Driving the zoom motor and the focus motor to rotate synchronously;
  • a sampling module configured to select N collection points corresponding to different zoom magnification values on the reference zoom curve
  • An actual value obtaining module configured to acquire, according to a preset auto-focusing algorithm, an actual focus position value when a focus estimation value of the N collection points reaches a maximum value at a corresponding zoom ratio value;
  • a correction module configured to complete the correction of the reference zoom tracking curve according to the obtained actual focus position values corresponding to the N collection points.
  • the present application also provides a computer program comprising computer readable code that, when executed on an electronic device, causes the electronic device to perform a method of correcting a zoom tracking curve of the sacred.
  • the application also provides a computer readable medium in which the computer program described above is stored.
  • the present application provides a method and apparatus for correcting a zoom tracking curve according to the current zoom
  • the direction and the preset rule corresponding to the zoom direction, the reference zoom curve is selected from the pre-stored plurality of theoretical zoom curves, and N different zoom ratio values are selected on the theoretical reference zoom curve.
  • the preset autofocus algorithm the actual focus position value when the focus estimation value reaches the maximum under the zoom magnification value corresponding to the collected points is obtained, and the correction of the reference zoom tracking curve is completed. That is, the present application can select a reference zoom tracking curve by using a preset rule corresponding to the zoom direction for the current zoom direction, and obtain the actual focus position of the collection point by auto focus, and then obtain the actual of each lens itself by correction. Zooming the tracking curve to ensure that the actual reference zoom tracking curve that has been corrected is synchronized in the subsequent zoom and auto focus, ensuring that the entire zoom process image can be focused clearly;
  • the focus motor when the actual focus position value is obtained, the focus motor is driven to a different focus position under the zoom magnification value corresponding to the collection point, and based on the image data corresponding to the focus position and the preset focus estimation value.
  • a function, the focus position value when the focus evaluation value is maximum is taken as the actual focus position value, and the focus estimation value function is associated with the scene corresponding to the image data. That is, the present application can correct the zoom tracking curve of the lens in different scenarios, and improve the accuracy and verification efficiency of the calibration result.
  • FIG. 1 is a flowchart of a process of an embodiment of a zoom tracking curve correction method in an embodiment of the present application
  • FIG. 2 is a schematic diagram of a theoretical zoom tracking curve preset in the embodiment of the present application.
  • FIG. 3 is a schematic diagram of selecting a collection point on a zoom tracking curve in the embodiment of the present application.
  • FIG. 4 is a structural block diagram of an embodiment of a zoom tracking curve correction apparatus in an embodiment of the present application.
  • Figure 5 schematically shows a block diagram of an electronic device for performing the method according to the present application
  • Figure 6 shows schematically a procedure for maintaining or carrying a method according to the present application.
  • the storage unit of the code is not limited to the present application.
  • the method described in the present application is a process of zooming and autofocusing when applied to a camera or a camera to capture an image.
  • the method described in the present application can also be applied to a mobile phone with a zoom, auto focus function, a PAD, a portable multimedia player (PMP), a TV, and the like.
  • FIG. 1 it is a flowchart of an embodiment of a method for correcting a zoom tracking curve according to the present application, which includes the steps of:
  • zoom tracking curve it is necessary to provide a pilot description of the zoom tracking curve. It is not difficult to understand that at least two zoom tracking curves having different focus distances are input in advance in the lens, please refer to FIG. 2 .
  • the horizontal axis represents the zoom magnification value
  • the vertical axis represents the focus position value.
  • the focus distances in the present scheme are 3 meters, 6 meters, 10 meters, and infinity respectively.
  • the zoom tracking curve is taken as an example. It can be seen that when the zoom motor position is at a small zoom magnification value, the zoom tracking curves of the four different focus distances are substantially coincident; when the zoom magnification becomes larger, the zoom tracking curves of different focus distances are gradually separated.
  • the distance is getting bigger and bigger. This shows that when the zoom motor position is at a small zoom factor value, the focus position of the motor does not change much as the distance of the object from the lens changes, but at a high zoom ratio, the object distance changes greatly, focusing.
  • the motor position also has a large deviation. Therefore, in the lens zooming process, first select a reference zoom tracking curve that best matches the current focus distance.
  • the at least two zoom tracking curves having different focus distances are input to the image pickup lens in advance and stored, for example, may be stored in advance in a storage medium, wherein the storage medium may be a synchronous dynamic random access memory (SDRAM). ), multi-chip package (MCP) memory or dynamic random access memory (DRAM).
  • SDRAM synchronous dynamic random access memory
  • MCP multi-chip package
  • DRAM dynamic random access memory
  • the zoom motor is switched from a small magnification to a large magnification or a large magnification to a small magnification.
  • the selection is selected.
  • the rules of the reference zoom tracking curve should also be different to ensure the accuracy of the selection of the reference zoom tracking curve. Therefore, in this embodiment, it is also required to determine a selection rule of the corresponding reference zoom tracking curve according to the zoom direction of the current zoom motor.
  • the focus motor when the zoom direction of the current zoom motor is a small magnification steering large magnification, the focus motor is driven to obtain a current zoom magnification value corresponding to the focus position in each zoom tracking curve. And the corresponding focus evaluation value, the zoom tracking curve at which the focus position having the largest focus evaluation value is determined is the reference zoom tracking curve.
  • the focus evaluation value of each focus position is calculated based on the preset focus estimation value function.
  • the zoom tracking curve at which the focus position at which the focus evaluation value is the largest is determined as the reference zoom tracking curve.
  • the zoom direction of the current zoom motor is a large magnification to a small magnification
  • the current focus position of the focus motor is acquired; and then the current zoom ratio value is acquired in each zoom tracking.
  • the corresponding focus position in the curve determines that the zoom tracking curve whose focus position is closest to the current focus position is the reference zoom tracking curve.
  • the zoom tracking curves of different focus distances are gradually separated, and the distance difference is larger and larger. That is, the same zoom magnification value has a large difference in the focus position corresponding to the zoom tracking curve of different focus distances. Therefore, in the zoom direction, the current focus motor position and the zoom motor position are obtained, and the current focus position value and current change are obtained. The multiplier value is then obtained by obtaining the current zoom magnification value in the corresponding focus position in each zoom tracking curve, and then comparing the focus position to the current focus position to determine the closest zoom point of the focus position to the current focus position.
  • the tracking curve is the reference zoom tracking curve.
  • the present application can select a reference zoom tracking curve by using a preset rule corresponding to the zoom direction for the current zoom direction, thereby ensuring the accuracy of the zoom tracking curve selection.
  • the method further includes the following steps:
  • the closest zoom tracking curve is selected as the reference zoom tracking curve in the foregoing steps. Further, it is also required to select N collection points on the reference zoom tracking curve, and the N collection points correspond to different zoom magnification values.
  • the zoom tracking curve of different focus distances has a high degree of coincidence, and less acquisition points should be selected under a small zoom magnification value; conversely, at a large zoom ratio Under the value, the zoom tracking curves of different focus distances are gradually separated, so under the large zoom magnification value, more collection points are selected. That is, the collection points selected in different regions on the reference zoom curve
  • the quantity is proportional to the value of the zoom ratio corresponding to the center position point of the current area.
  • the interval Tx of the collection point may be set to an inversely proportional to the value of the magnification change of the center of the region, so that the processor in the lens obtains the interval value calculated by the algorithm.
  • the embodiment is of course only exemplary, which is not limited in this application.
  • the reference zoom tracking curve may be divided into different regions according to the magnitude of the zoom magnification value.
  • the reference zoom tracking curve is divided into a small magnification region, a medium magnification region, and a large magnification region in the present application.
  • the method further includes the following steps:
  • the preset autofocus algorithm is a common climbing algorithm, and the focus motor is driven to move to different focus position values under the zoom magnification value corresponding to the collection point. And acquiring image data corresponding to the focus position value; and using the focus position value when the focus estimation value is maximum as the actual focus position value based on the image data and the preset focus estimation value function.
  • the focus motor is finely adjusted to change the distance between the lens and the captured object, and the lens is stopped based on a certain time or variable step to obtain the current focus position.
  • a frame image of the time obtains high frequency components of the image data along the horizontal X and the vertical Y, and calculates a focus evaluation value of the frame image based on a preset focus estimation value function.
  • the above operation is repeatedly performed until the focus position value at which the focus evaluation value is maximum is obtained, which is the actual focus position value.
  • the preset focus evaluation value function is:
  • the x refers to the horizontal high-frequency component value
  • y refers to the vertical high-frequency component value.
  • the algorithm accumulates the high-frequency energy values of all the horizontal x and vertical y of the current frame image data obtained from the data image. Go to the focus estimate.
  • the preset focus estimation function is associated with a scene in which the captured object is located, wherein the scene is identified by a preset scene recognition algorithm.
  • a plurality of different scene modes are preset, and each of the scene modes has a corresponding zoom magnification value, a light intensity value, a focus evaluation value function, a focus motor step size, and a focus. The judgment criteria for the end.
  • the method of an embodiment of the present application further includes the following steps:
  • the correction of the reference zoom tracking curve may be implemented not only by the N collection points, but also by the linear difference method and the correction of any two adjacent pole points. Distance, calculating an actual focus position value of the remaining points between the adjacent two collection points on the reference zoom tracking curve.
  • the method of the present application it is also required to acquire a theoretical focus position value corresponding to any of the N collection points on the reference zoom tracking curve, and calculate the theoretical focus position value and the actual focus position value. Correcting the distance between the two, and then using the linear difference method and the corrected distance of any two adjacent acquisition points, calculating the actual focus position value of the remaining points between the adjacent two collection points on the reference zoom tracking curve .
  • the actual focus position value Focus1 zoom[N] and the theoretical focus position value Focus2 zoom[N] corresponding to the N collection points are respectively acquired, and according to the actual focus position value.
  • Focus1 zoom [N] and the theoretical focus position value Focus2 zoom [N] calculate the corresponding correction distance focus zoom [N] , then the N correction distances corresponding to the N collection points can be obtained.
  • the algorithm for calculating the corrected distance is:
  • Focus zoom[N] Focus2 zoom[N] -Focus1 zoom[N] .
  • any two adjacent collection points zoom [N] and zoom [N-1] may be selected from the N collection points, and the corresponding correction distances focus zoom [N] and focus zoom [N-1] may be calculated. ], the calculated correction distance Focus arbitrary zoom magnification corresponding to the zoom magnification value between the two adjacent points are collected:
  • the theoretical focus position Focus2 zoom corresponding to the arbitrary zoom magnification value zoom between the adjacent collection points zoom [N] and zoom [N-1] is obtained, and then the zoom ratio is calculated.
  • the actual focus position corresponding to the value zoom is Zoom1 zoom :
  • Focus1 zoom focus zoom +Focus2 zoom
  • the actual focus position value of the remaining points between any two adjacent collection points can be obtained, and the specific number of samples can be determined according to the actual situation.
  • the corrected zoom tracking curve is corrected according to the acquired coordinates of at least N (variable magnification value, actual focus position value).
  • the present application provides a method for correcting a zoom tracking curve, and selecting a reference variable from a plurality of pre-stored theoretical zoom tracking curves according to a current zoom direction and a preset rule corresponding to the zoom direction.
  • the tracking curve is multiplied, and N collection points of different zoom magnification values are selected on the theoretical reference zoom tracking curve; and the focus estimation values of the zoom magnification values corresponding to the collected points are obtained according to the preset autofocus algorithm.
  • the actual focus position value at the maximum is reached to complete the correction of the reference zoom tracking curve.
  • the present application can select a reference zoom tracking curve by using a preset rule corresponding to the zoom direction for the current zoom direction, and obtain the actual focus position of the collection point by auto focus, and then obtain the actual of each lens itself by correction.
  • the zoom tracking curve is used to ensure that the actual reference zoom tracking curve that has been corrected is synchronized in the subsequent zoom and auto focus, ensuring that the entire zoom process image can be focused clearly.
  • the present application also provides a zoom tracking curve correction device.
  • the reference curve selection module 11, the sampling module 12, the actual value acquisition module 13, and the correction module 14 are included.
  • the device described in the present application is applied to a camera or a camera having a zooming and autofocus function.
  • the device described in the present application can also be applied to a mobile phone with a zoom, auto focus function, a PAD, a portable multimedia player (PMP), a TV, and the like.
  • PMP portable multimedia player
  • the embodiment of the present application exemplifies a specific embodiment thereof by using a digital camera as an example, but the embodiment does not constitute a limitation of the present application. The following specifically reveals the various modules. The specific function now.
  • the reference curve selection module 11 is configured to select a reference zoom tracking curve from the pre-stored at least two zoom tracking curves with different focus distances according to the zoom direction and the corresponding preset rule, according to the reference variable
  • the double tracking curve drives the zoom motor and the focus motor to rotate synchronously.
  • zoom tracking curve it is necessary to provide a pilot description of the zoom tracking curve. It is not difficult to understand that at least two zoom tracking curves having different focus distances are input in advance in the lens, please refer to FIG. 2 .
  • the horizontal axis represents the zoom magnification value
  • the vertical axis represents the focus position value.
  • the focus distances in the present scheme are 3 meters, 6 meters, 10 meters, and infinity respectively.
  • the zoom tracking curve is taken as an example. It can be seen that when the zoom motor position is at a small zoom magnification value, the zoom tracking curves of the four different focus distances are substantially coincident; when the zoom magnification becomes larger, the zoom tracking curves of different focus distances are gradually separated.
  • the distance is getting bigger and bigger. This shows that when the zoom motor position is at a small zoom factor value, the focus position of the motor does not change much as the distance of the object from the lens changes, but at a high zoom ratio, the object distance changes greatly, focusing.
  • the motor position also has a large deviation. Therefore, in the lens zooming process, first select a reference zoom tracking curve that best matches the current focus distance.
  • the at least two zoom tracking curves having different focus distances are input to the image pickup lens in advance and stored, for example, may be stored in advance in a storage medium, wherein the storage medium may be a synchronous dynamic random access memory (SDRAM). ), multi-chip package (MCP) memory or dynamic random access memory (DRAM).
  • SDRAM synchronous dynamic random access memory
  • MCP multi-chip package
  • DRAM dynamic random access memory
  • the reference curve selection module 11 further needs to determine a selection rule of the corresponding reference zoom tracking curve according to the zoom direction of the current zoom motor.
  • the reference curve selection module 11 further includes a first selection unit.
  • the first selecting unit is configured to drive the focus motor to obtain a current zoom magnification value corresponding to a focus position in each zoom tracking curve when the zoom direction of the current zoom motor is a small magnification to a large magnification. Focusing on the evaluation value to determine the focus position where the focus evaluation value is the largest The zoom tracking curve is the reference zoom tracking curve.
  • each focus is calculated based on the preset focus estimation value function.
  • the focus evaluation value of the position so that the zooming curve in which the first selecting unit determines the focus position at which the focus evaluation value is the largest is the reference zoom tracking curve.
  • the reference curve selection module further includes a second selection unit.
  • the second selecting unit is configured to acquire a current focus position of the focus motor when the zoom direction of the current zoom motor is a large magnification to a small magnification; and then obtain a current zoom magnification value corresponding to each zoom tracking curve.
  • the focus position, the zoom tracking curve that determines the closest focus position to the current focus position is the reference zoom tracking curve.
  • the zoom tracking curves of different focus distances are gradually separated, and the distance difference is larger and larger. That is, the same zoom factor value has a large difference in the focus position corresponding to the zoom tracking curve of different focus distances, so in the zoom direction, the second selecting unit acquires the current focus motor position and the zoom motor position, and obtains the current Focusing the position value and the current zoom magnification value, and then obtaining the current zoom magnification value in the corresponding focus position in each zoom tracking curve, and the second selecting unit compares the focus position to the current focus position by comparing the focus position,
  • the zoom tracking curve that determines the closest focus position to the current focus position is the reference zoom tracking curve.
  • the reference curve selection module 11 of the present application can select the reference zoom tracking curve by using a preset rule corresponding to the zoom direction for the current zoom direction, thereby ensuring the accuracy of the zoom tracking curve selection. .
  • sampling module 12 is configured to select N pairs on the reference zoom tracking curve. Should be at the collection point of different zoom ratio values.
  • the sampling module 12 further needs to select N collection points on the reference zoom tracking curve, and the N collection points correspond to different zoom magnification values.
  • the zoom tracking curve of different focus distances has a high degree of coincidence, and the sampling module 12 should select fewer acquisition points under a small zoom magnification value;
  • the zoom tracking curves of different focus distances are gradually separated, so the sampling module 12 selects more collection points under the large zoom magnification value. That is, the number of collection points selected in different regions on the reference zoom tracking curve is proportional to the value of the zoom magnification corresponding to the central position point of the current region.
  • the sampling module 12 may set an interval Tx of the collection point to an algorithm that is inversely proportional to the value of the magnification of the center of the region, so that the processor in the lens calculates according to the algorithm.
  • the interval value is used to obtain a corresponding number of collection points.
  • the sampling module 12 in the present application may divide the reference zoom tracking curve into different regions according to the magnitude of the zoom ratio value. For example, the reference zoom tracking curve is divided into a small magnification region, a medium magnification region, and a large magnification region in the present application.
  • the sampling module 12 selects a first magnification threshold and a second magnification threshold on the reference zoom tracking curve, and when the magnification value is less than the first magnification threshold, the sampling module 12 determines that it is in a small magnification region; When the value is greater than the second magnification threshold, the sampling module 12 determines that it is in the large magnification region; the others are the medium magnification region.
  • the actual value obtaining module 13 is configured to acquire, according to a preset auto-focusing algorithm, an actual focus position value when the focus estimation value of the N points of the N collection points reaches a maximum value under the corresponding zoom ratio value.
  • the preset auto-focusing algorithm is a common climbing algorithm
  • the actual value acquiring module 13 drives the focusing motor under the zoom factor value corresponding to the collecting point. Moving to different focus position values, and acquiring image data corresponding to the focus position value; the actual value acquisition module 13 based on the image data and a preset focus estimation value function, The focus position value at which the estimated value is maximum is taken as the actual focus position value.
  • the actual value obtaining module 13 drives the focus motor to finely adjust the distance between the lens and the captured object under the zoom magnification value corresponding to the collection point, and stops based on a certain time or variable step size.
  • the lens acquires a frame image of the current focus position, acquires high frequency components of the image data along the horizontal X and the vertical Y, and then the actual value acquisition module 13 calculates the frame image based on the preset focus estimation value function.
  • Focus evaluation value The above operation is repeatedly performed until the actual value acquisition module 13 acquires the focus position value when the focus evaluation value is maximum, and the focus position value is the actual focus position value.
  • the preset focus evaluation value function is:
  • the x is a horizontal high-frequency component value
  • y is a vertical high-frequency component value.
  • the algorithm accumulates all the horizontal x and vertical y high-frequency energy values of the current frame image data obtained from the data image to obtain the Focus on the estimate.
  • the preset focus estimation function is associated with a scene in which the captured object is located, wherein the scene is identified by a preset scene recognition algorithm.
  • a plurality of different scene modes are preset in the camera lens, and each of the scene modes has a corresponding zoom magnification value, a light intensity value, a focus evaluation value function, and a focus.
  • the actual value obtaining module 13 compares the light intensity information, the gain, and the zoom magnification value of the current image data with the zoom ratio value, the gain, and the light intensity information value in the preset plurality of scene modes to select the best match.
  • the scene mode acquires the focus motor step size, the focus evaluation value function, and the focus end judgment criterion in the scene mode.
  • correction module 14 is configured to complete the correction of the reference zoom tracking curve according to the obtained actual focus position values corresponding to the N collection points.
  • the correction module 14 may implement the correction of the reference zoom tracking curve not only by the N collection points, but also the linear difference method and any adjacent two.
  • the correction distance of the poles is calculated, and the actual focus position value of the remaining points between the adjacent two collection points on the reference zoom tracking curve is calculated.
  • the device of the present application further includes an actual value acquisition module and a second sampling unit.
  • the actual value obtaining module is configured to acquire any one of the N collection points in a reference zoom tracking A corresponding theoretical focus position value on the curve, and a correction distance between the theoretical focus position value and the actual focus position value is calculated. And calculating, by the second sampling unit, the actual focus position of the remaining points between the adjacent two collection points on the reference zoom tracking curve by using the linear difference method and the corrected distance of any two adjacent collection points. value.
  • the actual value obtaining module 13 and the theoretical value acquiring module respectively acquire the actual focus position value Focus1 zoom [N] and the theoretical focus position value Focus2 corresponding to the N collection points.
  • zoom [N] and acquires the actual focusing module according to the zoom position value Focus1 [N] and the theoretical value obtained by the focus position of the zoom Focus2 are theoretical values corresponding to [N] calculated correction distance focus zoom [N], to obtain the N N correction distances corresponding to the collection points.
  • the algorithm for calculating the corrected distance is:
  • Focus zoom[N] Focus2 zoom[N] -Focus1 zoom[N] .
  • the second sampling unit may select any two adjacent collection points zoom [N] and zoom [N-1] from the N collection points, and calculate a corresponding correction distance focus zoom [N] and Focus zoom [N-1], the calculated correction distance Focus arbitrary zoom magnification corresponding to the zoom magnification value between the two adjacent points are collected:
  • the theoretical focus acquiring module acquires the theoretical focus position Focus2 zoom corresponding to the arbitrary zoom magnification value zoom between the adjacent collection points zoom [N] and zoom [N-1] , and then Calculating the actual focus position Focus1 zoom corresponding to the zoom ratio value zoom by the second sampling unit:
  • Focus1 zoom focus zoom +Focus2 zoom
  • the second sampling unit can obtain the actual focus position value of the remaining points between any two adjacent collection points, and the specific number of samples can be determined according to actual conditions.
  • the correction module 14 performs correction on the existing reference zoom tracking curve according to the acquired coordinates of at least N (variable magnification value, actual focus position value).
  • the present application provides a correction device for a zoom tracking curve, which is pre-stored by the reference curve selection module 11 according to the current zoom direction and the preset rule corresponding to the zoom direction.
  • the selected reference zoom tracking curve is selected in the theoretical zoom tracking curve, and N sampling points of different zoom magnification values are selected by the sampling module 12 on the theoretical reference zoom curve; and then the preset auto focus algorithm is adopted.
  • the actual value obtaining module 13 obtains the actual focus position value when the focus estimation value reaches the maximum under the zoom magnification value corresponding to the collected points, and then completes the correction of the reference zoom tracking curve by the correction module 14.
  • the present application can select a reference zoom tracking curve by using a preset rule corresponding to the zoom direction for the current zoom direction, and obtain the actual focus position of the collection point by auto focus, and then obtain the actual of each lens itself by correction.
  • the zoom tracking curve is used to ensure that the actual reference zoom tracking curve that has been corrected is synchronized in the subsequent zoom and auto focus, ensuring that the entire zoom process image can be focused clearly.
  • the various component embodiments of the present application can be implemented in hardware, or in a software module running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functionality of some or all of the components of the correction device for the zoom tracking curve in accordance with embodiments of the present application may be implemented in practice using a microprocessor or digital signal processor (DSP). .
  • DSP digital signal processor
  • the application can also be implemented as a device or device program (e.g., a computer program and a computer program product) for performing some or all of the methods described herein.
  • Such a program implementing the present application may be stored on a computer readable medium or may be in the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.
  • FIG. 5 illustrates a correction device that can implement a zoom tracking curve in accordance with the present application, such as a computer, mobile device, cell phone, PAD, portable multimedia player (PMP), TV, and the like.
  • the electronic device conventionally includes a processor 510 and a computer program product or computer readable medium in the form of a memory 520.
  • the memory 520 may be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read Only Memory), an EPROM, a hard disk, or a ROM.
  • Memory 520 has a memory space 530 for program code 531 for performing any of the method steps described above.
  • storage space 530 for program code may include various program code 531 for implementing various steps in the above methods, respectively.
  • the program code can be read from or written to one or more computer program products.
  • These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such computer program products are typically portable or fixed as described with reference to Figure 6.
  • the storage unit may have a storage section, a storage space, and the like arranged similarly to the storage 520 in the electronic device of FIG.
  • the program code can be compressed, for example, in an appropriate form.
  • the storage unit comprises computer readable code 531 'is a code readable by a processor, such as 510, which when executed by an electronic device causes the electronic device to perform each of the methods described above step.

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  • Length Measuring Devices By Optical Means (AREA)

Abstract

La présente invention se rapporte au domaine technique de la surveillance par caméra, et concerne, en particulier, un procédé et un dispositif pour corriger une courbe de suivi de zoom. Le procédé comprend les étapes suivantes : selon une direction de zoom et des règles prédéfinies correspondantes de ces dernières, sélectionner une courbe de suivi de zoom de référence parmi au moins deux courbes de suivi de zoom préstockées ayant différentes distances de mise au point, permettant ainsi d'amener un moteur de zoom et un moteur de mise au point à tourner de manière synchrone selon la courbe de suivi de zoom de référence ; sélectionner un nombre N de points de collecte correspondant à différentes valeurs de zoom sur la courbe de suivi de zoom de référence ; sur la base d'un algorithme de mise au point automatique préréglé, obtenir respectivement une valeur de position de mise au point réelle d'un point de collecte quelconque parmi le nombre N de points de collecte lorsqu'une valeur d'estimation de mise au point, à la valeur de zoom correspondante, atteint une valeur maximale ; selon les valeurs de position de mise au point réelles obtenues correspondant au nombre N de points de collecte, terminer la correction de la courbe de suivi de zoom de référence. Ainsi, la présente invention est apte à obtenir la courbe de suivi de zoom réelle de chaque lentille, et à garantir que le zoom et la mise au point automatique ultérieurs sont réalisés de manière synchrone avec la courbe de suivi de zoom de référence réelle corrigée, de telle sorte que des images sont mises au point et sont nettes dans tout le processus de zoom.
PCT/CN2016/108870 2015-12-23 2016-12-07 Procédé et dispositif pour corriger une courbe de suivi de zoom WO2017107770A1 (fr)

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