JP4624022B2 - Surveillance camera device - Google Patents

Description

  The present invention relates to a surveillance camera device having an extender automatic switching function.

  In a conventional camera device having an extender switching function, when it is detected by the extender discriminating device that the magnification of the extender has been switched, the zoom lens is moved to a position where the focal lengths are matched before and after this switching. Further, when the zoom lens reaches the wide end or the tele end by the position detection device, the extender switching mechanism automatically switches the extender magnification (see, for example, Patent Document 1).

  As a zooming method of the camera device, there are a mechanical zoom method in which a zoom lens is mechanically moved continuously and an electronic zoom method in which electronic zooming is performed using a field memory. However, electronic zoom enables zooming by electronically interpolating video signals. Then, the zoom characteristics of the mechanical zoom system and the zoom characteristics of the electronic zoom system are combined to enable switching between high speed and low speed zoom (for example, see Patent Document 2).

JP 2001-51183 (paragraphs 0010 to 0036, FIG. 1) JP-A-5-183793 (paragraphs 0011 to 0022, FIG. 4)

The conventional camera device having the extender switching function has the following problems.
(1) In Patent Document 1, when the extender is switched, the angle of view changes twice and it is difficult to see, so the video at the time of switching is blocked so that it is not shown to the supervisor. However, it is originally preferable to provide an image with a smoothly changing angle of view to the monitor.

(2) In Patent Document 1, before and after switching of the extender magnification, the position of the zoom lens that matches the focal position is obtained from the relationship between the extender magnification and the focal length, and a memory that can refer to data indicating these relationships There is a description to memorize. However, there is no specific disclosure of how to obtain the information, and there is a problem that the calculation becomes complicated if it is assumed that the position is obtained by calculation based on the relationship between them. In particular, even when the extender is inserted or removed, the focal position can be adjusted by adjusting the position of the zoom lens (for example, in the case of the relationship between point A and point C described in FIG. 2 of Patent Document 1). When instructed by a common focal length from the outside (for example, the focal length indicated by (C) in FIG. 2 of Patent Document 1), the insertion / extraction of the extender, and the zoom lens position associated therewith depending on other conditions. It is necessary to perform complicated processing such as adjustment.

  The present invention has been made to solve the above-described problems, and can uniquely determine the setting of the extender and the zoom lens and can easily see the zoom control at the time of inserting / removing the extender continuously. An object of the present invention is to obtain a monitoring camera device that can provide a zoom control image.

The monitoring camera device according to the present invention is a camera monitoring device having a zoom lens having an extender and a control unit that controls driving of the zoom lens and the extender. The control unit indicates an optical focal position corresponding to a zoom instruction. absolute focus position, with the extender of insertion, and the focus setting table showing a lens focal position is the focal position of the zoom lens set to adjust in accordance with the insertion and removal of the extender corresponds to the absolute focus position, wherein from the absolute focus position obtained by's over arm instruction, the focus setting selects the absolute focal position of the table, when the required insertion of the extender from the selected the absolute focus position, the lens focal position Driving the zoom lens to the maximum telephoto position / extender magnification; By performing interpolation with zoom, the absolute focus position is set to the maximum telephoto position, and when the absolute focus position reaches the maximum telephoto position, an extender is inserted and a change in magnification due to the insertion of the extender is canceled. Then, the zoom lens is moved from the maximum telephoto position / extender magnification to the lens focus position corresponding to the absolute focus position of the zoom instruction in the focus setting table .

According to the invention, the control unit is determined such that the absolute focus position of an optical focal position corresponding to the zoom instruction, insertion of the extender corresponding to the absolute focus position, and in accordance with the insertion and removal of the extender interpolation zoom includes a focus setting table showing a lens focal position is the focal position of the lens, the absolute focus position obtained by's over arm instruction, select the absolute focus position of the focus setting table, extender from the selected absolute focus position When it is necessary to drive the zoom lens until it reaches the maximum telephoto position / extender magnification of the lens focal position and interpolation is performed by electronic zoom, the absolute focal position is set to the maximum telephoto position. When the focal position reaches the maximum telephoto position, the extender is inserted and the magnification change accompanying the insertion of the extender is considered. Interpolated by an electronic zoom to, then, from the most telephoto position / extender magnification zoom lens, since the move to the lens focal position corresponding to the absolute focus position of the zoom instruction in focus setting table, the operator to switch the extender It is possible to effectively switch by automatically switching without being conscious.

FIG. 1 is a block diagram of a surveillance camera apparatus showing Embodiment 1 of the present invention.
In the figure, the surveillance camera device includes a zoom lens 1, an extender switching unit 2, an image sensor 3, an image processing unit 4, an iris driving circuit 5, a focus driving circuit 6, a zoom driving circuit 7, a camera control unit 8, and an EEPROM 9. The
The signal system is an image processing state for outputting an external control signal 10 input to the camera control unit 8, luminance information indicating the luminance state in the video processing unit 4, electronic zoom magnification information indicating the current electronic zoom magnification, and the like. Signal 11, video processing instruction signal 12 for the camera control unit 8 to give a gain instruction and an electronic zoom magnification instruction to the video processing unit 4, a lens state signal 13 for outputting the current iris, focus, and focal length data of the zoom lens 1, and an extender It consists of an extender switching signal 14 for instructing the switching unit 2 to switch the extender insertion / extraction.

Next, an outline of the operation will be described with reference to FIG. Light from the subject enters the zoom lens 1 including the extender switching unit 2 and is converted from light to an electrical signal by the image sensor 3. The converted electrical signal is optimized by the video processing unit 4 and output as a video signal. Further, the video processing unit 4 outputs a video processing state signal 11 to the camera control unit 8. As a result, the camera control unit 8 receives an instruction from the external control signal 10 and the like.
(1) The iris driving circuit 5 is driven to set an optimum luminance level. Further, the camera control unit 8 instructs the gain adjustment by the video processing instruction signal 12 when the necessary luminance level is not reached even when the lens reaches the open end by the luminance information included in the input video processing state signal 11. The brightness is adjusted to an appropriate level.
(2) The focus drive circuit 6 is driven to perform proper focus control.
(3) The extender switching unit 2 is driven to insert and remove the extender, the zoom drive circuit 7 is driven, and if necessary, the video processing unit 4 is instructed by the electronic zoom magnification by the video processing instruction signal 12 to perform appropriate zoom control. Is going.

  The camera control unit 8 stores focal length data in the EEPROM 9 in advance. Next, the specific operation (3) according to the present invention will be described in the following first and second embodiments. For simplicity, the extender magnification is set to twice the maximum focal length of the zoom lens 1. However, this setting is an example and can be changed as appropriate in actual operation.

Embodiment 1 FIG.
FIG. 2 is an explanatory diagram of zoom control operations performed by the camera control unit 8 according to the first embodiment of the present invention. FIG. 3 is an explanatory diagram of a focus setting table which is referred to when the camera control unit 8 performs zoom control according to FIG. is there. In FIG. 3, the focus setting table 20 includes an absolute focus position 21, a lens focus position 22, and an extender flag 23. Here, the absolute focus position 21 is optical science focal position that will be output as an image corresponding to the zoom instruction, the lens focus position 22 indicates the focal position of the zoom lens 1 in a state that does not insert the extender. In the extender flag 23, 0 indicates a removal state and 1 indicates an insertion state.

In the focus setting table 20, “ 0 ” of the lens focal position 22 is the widest angle position of the zoom lens 1, and “10” is the maximum telephoto position. In the focus setting table 20, the position information data of the zoom lens 1 often changes linearly. However, the data is digitized in accordance with the focus position and converted into a table, and the EEPROM 9 of the camera control unit 8 is used. Is remembered. Further, the lens focal position 22 of the focal point setting table 20 exceeds the farthest telephoto position 10 of the lens focal position 22, and at the position where the extender is inserted, the parameters of the absolute focal position 21 are respectively divided by 2 of the extender magnification. In addition to the value, each parameter of the extender flag 23 is set as a parameter 1 indicating extender insertion.

  Next, the operation of the camera control unit 8 will be described with reference to FIGS. In step S10, the camera control unit 8 inputs a zoom instruction indicating movement (including preset movement) from the external control signal 10 to an arbitrary focal position. In step S11, the camera control unit 8 calculates an absolute focal position 21 based on the input zoom instruction. . Here, if there is focal position data in the zoom instruction parameter, it is set as the absolute focal position 21. In the case of preset movement, the focal position data stored in the EEPROM 9 corresponding to the preset number is called to obtain the absolute focal position 21.

  Next, in step S12, the camera control unit 8 refers to the focus setting table 20, and acquires parameters of the lens focus position 22 and the extender flag 23 to be set based on the absolute focus position 21 calculated in step S11. For example, when the absolute focal position 21 obtained in step S11 is “14”, the obtained parameters are “7” for the lens focal position 22 and the extender flag regardless of the current lens focal position 22 and extender flag 23 state. 23 becomes “1”. Thereby, in step S13, the camera control unit 8 performs zoom control according to the parameters acquired in step S12.

  For example, when the absolute focal position 21 changes from “10” to “11”, the camera control unit 8 inserts an extender and moves the lens focal position 22 from “10” to “5.5”. Let When the lens focal position 22 changes from “11” to “10”, the camera control unit 8 removes the extender and moves the lens focal position 22 from “5.5” to “10”. .

  Further, for example, in the zoom control in step S13, the driving speed of the zoom lens 1 when the extender is inserted is set to ½ of the driving speed before the extender is inserted, and when the extender is removed, the driving speed is the same as the driving speed. By returning it, the zoom speed appears to be constant on the output video regardless of whether the extender is inserted or removed.

As described above, since the position of the zoom lens and the presence / absence of the extender insertion in response to the zoom instruction from the external control signal 10 can be uniquely determined with reference to the focus setting table 20, the processing becomes simple and the structure of the built-in software Can be simplified.
In addition, since the drive speed of the zoom lens 1 when the extender is inserted is set to ½ of the drive speed before the extender is inserted, and when the extender is removed, the drive speed is returned to the original drive speed. Therefore, the zoom speed seems to be constant, and smooth zoom control that is easier to see can be performed.

Embodiment 2. FIG.
Normally, the extender insertion / removal operation is performed instantaneously. However, since the movement time between the maximum telephoto position and the intermediate position of the zoom lens 1 takes about 1 second, in the first embodiment, the zoom lens moves due to the extension lens insertion / removal. There is a tendency that the size of the subject is suddenly enlarged / reduced. In the present embodiment, in order to prevent this phenomenon, the absolute focal position 21 during driving of the zoom lens 1 is interpolated by changing the electronic zoom magnification to reduce the change in the angle of view when the extender is inserted and removed.

FIG. 4 is a matrix table for explaining the operation of the camera control unit 8 according to the second embodiment of the present invention, FIGS. 5 and 6 are operation explanatory views when the extender is inserted, and FIGS. It is operation | movement explanatory drawing in the case of being performed.
The configuration is the same as in FIG. 1 and the description thereof is omitted, and the operation will be described with reference to FIGS. First, in FIG. 4, event 0 is an event when a zoom instruction is detected from an external control signal 10 input to the camera control unit 8, and event 1 is a current position of the zoom lens 1 being driven is detected from a lens state signal 13. It is an event. Event 2 is an event when the completion of the insertion of the extender is detected, event 3 is an event when the completion of the removal of the extender is detected, and the insertion or removal of the extender is detected in the camera control unit 8 or This can be detected by the current of the switching start circuit in the extender switching unit 2 or a timer in the camera control unit 8. In addition, the extender switching unit 2 may include a determination device.

Further, status 0 is an initial state, status 1 is a lens driving end waiting state without an extender insertion / removal operation, status 2 is a lens half-telephoto half position at the time of the extender insertion operation (a lens focal point position 22 is a position of “5”, (Hereinafter referred to as the most telephoto half position) Waiting for completion of driving, Status 3 is waiting for the extender to be inserted when the extender is inserted, Status 4 is waiting for the lens drive to be completed when the extender is inserted, and Status 5 is that the extender has been removed The extender removal waiting state at the time of the removal operation, and status 6 are the lens drive end waiting state at the time of the extender removal operation.
It should be noted that the maximum telephoto half position is set so that the extender can be inserted, and in this embodiment, the extender magnification is doubled, so that the half maximum telephoto position is set.

  This status is determined by the lens flag, EX insertion code, and EX removal code. The lens flag indicates that the zoom lens 1 is being driven and is turned off when the zoom lens 1 is being driven. The EX insertion code is a code indicating the state when the extender is inserted. 0 indicates an initial state, 1 indicates waiting for driving of the zoom lens 1 to the half-telephoto half position, 2 indicates waiting for insertion of the extender, and 3 indicates waiting for lens driving to end. . The EX removal code is a code indicating a state when the extender is removed. 0 indicates an initial state, 1 indicates a wait for the extender to be removed, and 2 indicates a wait for the end of lens driving.

Next, the basic operation of the camera control unit 8 will be described with reference to FIG.
(1) In the case of status 0 and event 0, the absolute focus position 21 is calculated according to the acquired zoom instruction, and the parameters of the lens focus position 22 and extender flag 23 to be set based on the focus setting table 20 are acquired. As a result, when the extender insertion / removal operation is unnecessary, the zoom lens 1 is driven according to the parameters and the lens flag is turned on to set the status to 1. If the extender needs to be inserted, the zoom lens 1 is instructed to be driven to the maximum telephoto half position, the lens flag is turned on, the EX insertion code is set to 1, and the status is set to 2. Note that electronic zoom interpolation is performed as necessary. Further, when the extender is required to be removed, the extender removal is instructed, the EX removal code is set to 1, and the electronic zoom interpolation is performed to set the status to 5. The electronic zoom interpolation refers to an operation for obtaining a desired absolute focus position 21 by adjusting the electronic zoom when the desired absolute focus position 21 cannot be obtained only by removing the extender and driving the zoom lens 1. Specific operation will be described later.

(2) In the case of status 1 and event 1, the position of the zoom lens 1 is confirmed by the lens state signal 13, and when it reaches the predetermined position, the lens flag is turned off and the status is set to 0 because the lens driving is completed. If the predetermined position has not been reached, nothing is done and the status remains 1.

(3) In the case of status 2 and event 1, the position of the zoom lens 1 is confirmed by the lens status signal 13, and when reaching the most telephoto half position, the lens flag is turned off and the extender is inserted, and the EX insertion code is set. Set to 2. Further, the electronic zoom interpolation is performed so that the absolute focal position 21 maintains the half-telephoto half position, and the status is set to 3. If the maximum telephoto half position has not been reached, electronic zoom interpolation is appropriately performed so that the absolute focus position 21 moves in the telephoto direction corresponding to the drive position of the zoom lens 1, and the status is Keep 2

(4) In the case of status 3 and event 2, the zoom lens 1 is driven to a predetermined position when it is necessary to further drive the zoom lens 1 with reference to the parameter of the lens focal position 22 acquired in advance. To instruct. Also, the lens flag is turned on, the EX insertion code is set to 3, and the status is set to 4. If it is not necessary to drive the zoom lens 1, the EX insertion code is set to 0 and the status is set to 0.

(5) In the case of status 4 and event 1, the position of the zoom lens 1 is confirmed by the lens status signal 13, and when reaching the predetermined position, the lens flag is turned off because the lens driving is completed, the EX insertion code is set to 0, and the status is displayed. Set to zero. If the predetermined position has not been reached, nothing is done and the status remains at 4.

(6) In the case of status 5 and event 3, the zoom lens 1 is driven to a predetermined position when it is necessary to further drive the zoom lens 1 by referring to the parameter of the lens focal position 22 acquired in advance. And the lens flag is turned on, the EX removal code is set to 2, and the electronic zoom interpolation is performed to set the status to 6. If it is not necessary to drive the zoom lens 1, electronic zoom interpolation is performed as necessary, and the EX removal code is set to 0, and the status is set to 0.

(7) In the case of status 6 and event 1, the position of the zoom lens 1 is confirmed by the lens status signal 13, and when it reaches the predetermined position, the lens flag is turned off because the lens driving is completed, and the EX removal code is set to 0. Set to 0. Electronic zoom interpolation is performed as necessary. If the predetermined position has not been reached, electronic zoom interpolation is performed as necessary, and the status remains at 6.

Next, specific operations when the extender is inserted and removed will be described below with reference to FIGS.
5 to 8, the horizontal axis represents time, the vertical axis A represents the absolute focal position 21 and the lens focal position 22, and the vertical axis B represents the electronic zoom magnification. The two-dot chain line C indicates the absolute focal position 21, the solid line D indicates the lens focal position 22, and the dotted line E indicates the electronic zoom magnification.

1. This is a case where an extender is inserted, and the absolute focal position 21 moves from “4” to “14”, which is half or less of the most telephoto position (FIG. 5).
In FIG. 5, the camera control unit 8 follows the operation of event 0 and status 0 at the point t0.
(1) The zoom lens 1 is driven so that the lens focal position 22 is at the most telephoto half position “5”.
(2) Set the lens flag to ON, set the EX insertion code to 1, and set the status to 2.
(3) Here, magnification interpolation by electronic zoom is unnecessary and is not performed.

Further, the camera control unit 8 follows the operation of the event 1 and the status 2 until reaching the point t2.
(1) From t1 to t2, when the lens focal position 22 reaches “5”, the electronic zoom magnification is increased from 1 to 2 so that the absolute focal position 21 becomes the maximum telephoto position “10”. Electronic zoom interpolation is performed (the lens focal point position 22 remains unchanged).
(2) From t2 to t3, at the time t2 when the absolute focal position 21 reaches “10”, the extender insertion is instructed and the magnification change accompanying the insertion is interpolated by the electronic zoom. That is, the electronic zoom magnification is returned from 2 times to 1 so as to cancel the double due to the extension insertion. At this time, the absolute focal position 21 is constant at “10” between t2 and t3 and does not change smoothly. However, since the interval between t2 and t3 is very short, the absolute focus position 21 corresponding to the zoom instruction seems to change smoothly.
(3) At t2, the lens flag is turned off, the EX insertion code is set to 2, and the status is set to 3.

Also, the camera control unit 8 follows the operation of event 2 and status 3 at the point t3 where the end of the extender insertion is detected.
(1) The zoom lens 1 is driven so that the lens focal position 22 becomes “7”.
(2) Set the lens flag to ON, set the EX insertion code to 3, and set the status to 4.

The camera control unit 8 does not perform electronic zoom interpolation according to the operation of event 1 and status 4 until the point t4.
(1) At time t4 when the lens focal position 22 reaches “7”, the lens flag is turned off, the EX insertion code is set to 0, and the status is set to 0.

2. This is a case where an extender is inserted, and the absolute focal position 21 moves from “9” to “14”, which is more than half of the telephoto position (FIG. 6).
In FIG. 6, the camera control unit 8 follows the operation of event 0 and status 0 at the point t0.
(1) The zoom lens 1 is driven so that the lens focal position 22 changes from “9” to “5”.
(2) Set the lens flag to ON, set the EX insertion code to 1, and set the status to 2.
(3) Electronic zoom interpolation according to the driving speed of the zoom lens 1 toward the absolute focal position 21 of “10”.

Further, the camera control unit 8 follows the operation of the event 1 and the status 2 until reaching the point t2.
(1) Even when the absolute focal position 21 reaches “10”, since the driving of the zoom lens 1 is not completed yet, the electronic zoom is performed so that the absolute focal position 21 remains “10” until t2 is reached. Interpolate while increasing.
(2) At the time t2 when the lens focal position 22 reaches “5”, the extender insertion is instructed, and the magnification change accompanying the insertion is interpolated by the electronic zoom. That is, the electronic zoom magnification is returned from 2 times to 1 so as to cancel the double due to the extension insertion. At this time, the absolute focal position 21 is constant at “10” between t2 and t3 and does not change smoothly. However, since the interval between t2 and t3 is very short, the absolute focus position 21 corresponding to the zoom instruction seems to change smoothly.
(3) At t2, the lens flag is turned off, the EX insertion code is set to 2, and the status is set to 3.

Also, the camera control unit 8 follows the operation of event 2 and status 3 at the point t3 where the end of the extender insertion is detected.
(1) The zoom lens 1 is driven so that the lens focal position 22 becomes “7”.
(2) Set the lens flag to ON, set the EX insertion code to 3, and set the status to 4. During this time, electronic zoom interpolation is not performed.

The camera control unit 8 follows the operation of event 1 and status 4 until the point t4.
(1) When the lens focal position 22 reaches “7”, the lens flag is turned off, the EX insertion code is set to 0, and the status is set to 0.

3. This is a case where the extender is removed, and the absolute focal position 21 moves from “14” to “4” which is half or less of the most telephoto position (FIG. 7).
In FIG. 7, the camera control unit 8 follows the operation of event 0 and status 0 at the point t0.
(1) An instruction to remove the extender is given, and electronic zoom interpolation is performed so that the absolute focal position 21 remains “14”. That is, when the extender is removed, the absolute focal position 21 is changed from “14” to “7”, so that interpolation is performed while increasing the electronic zoom magnification from 1 to 2 to offset this. As a result, the absolute focal position 21 between t0 and t1 remains constant at “14”.
(2) Set the EX removal code to 1 and the status to 5.

In addition, the camera control unit 8 follows the operation of event 3 and status 5 at the point t1 where the extender removal is detected.
(1) The zoom lens 1 is driven so that the lens focal position 22 becomes “4”.
(2) Perform electronic zoom interpolation.
(3) Turn on the lens flag, set the EX removal code to 2, and set the status to 6.

In addition, the camera control unit 8 follows the operations of event 1 and status 6 until the zoom lens 1 reaches the point t2 where the driving ends.
(1) The electronic zoom interpolation according to the driving speed of the zoom lens 1 is performed for the absolute focal position 21 until t2 is reached.
(2) When t2 is reached, the lens flag is turned off, and the lens focal position 22 remains “4”.
(3) Further, electronic zoom interpolation is performed according to the driving speed of the zoom lens 1 until the absolute focal position 21 reaches t3 of “4”.
(4) At time t3 when the absolute focal position 21 is “4”, the EX removal code is set to 0 and the status is set to 0.

4). In this case, the extender is removed, and the absolute focus position 21 moves from “14” to “9”, which is half or more than the most telephoto position (FIG. 8).
In FIG. 8, the camera control unit 8 follows the operation of event 0 and status 0 at the point t0.
(1) An instruction to remove the extender is given, and electronic zoom interpolation is performed so that the absolute focal position 21 remains “14”. That is, since the absolute focal position 21 is changed from “14” to “7” when the extender is removed, interpolation is performed while increasing the electronic zoom magnification from 1 to 2 to cancel this. As a result, the absolute focal position 21 between t0 and t1 remains constant at “14”.
(2) Set the EX removal code to 1 and the status to 5.

In addition, the camera control unit 8 follows the operation of event 3 and status 5 at the point t1 where the extender removal is detected.
(1) The zoom lens 1 is driven so that the lens focal position 22 becomes “9”.
(2) Perform electronic zoom interpolation.
(3) Set the lens flag to ON, set the EX removal code to 2, and set the status to 6.

In addition, the camera control unit 8 follows the operations of event 1 and status 6 until the zoom lens 1 reaches the point t2 where the driving ends.
(1) Electronic zoom interpolation is performed in which the absolute focal position 21 follows the driving speed of the zoom lens 1 until t2 is reached.
(2) When t2 is reached, the lens flag is turned off, and the lens focal position 22 remains “4”.
(3) Electronic zoom interpolation according to the driving speed of the zoom lens 1 is performed until the absolute focal position 21 reaches t3 of “9”.
(4) When t3 is reached, the EX removal code is set to 0 and the status is set to 0.

As described above, the insertion / extraction of the extender has been described. When the extender is inserted, as shown in FIGS. 5 and 6, the absolute focal position 21 does not change and becomes stepped between t2 and t3. However, since the interval between t2 and t3 is very short, the absolute focus position 21 corresponding to the zoom instruction seems to change smoothly. Similarly, when the extender is removed, as shown in FIGS. 7 and 8, the absolute focus position 21 does not change during t0 to t1 and is constant and stepped, but at t0 to t1. Since the interval is very short, the absolute focal position 21 corresponding to the zoom instruction seems to change smoothly.

In addition, when the extender is inserted, when the initial absolute focus position 21 is equal to or less than the most telephoto half position, the absolute focus position 21 changes smoothly as shown in FIG. When the position 21 is equal to or greater than the most telephoto half position, as shown in FIG. 6, the absolute focal position 21 does not change between t1 and t2, and the change is not smooth. However, in this case, the absolute focal position 21 corresponding to the zoom instruction is smoothly changed by maximizing the driving speed of the zoom lens 1 and shortening the arrival time from t1 to t2.

  In addition, as shown in FIGS. 7 and 8, when the extender is removed, the initial absolute focus position 21 is not more than the most telephoto half position, or the absolute focus position 21 changes smoothly regardless of the above. ing.

  Also in the present embodiment, similarly to the first embodiment, the drive speed of the zoom lens 1 when the extender is inserted is halved, and when the extender is removed, the original drive speed is restored. On the output video, the zoom speed appears to be constant regardless of the extender insertion / extraction.

The specific example of the operation according to the second embodiment of the present invention has been described above, but the gist of the operation is as follows.
1. When the extender is inserted (1) In order to allow the extender to be inserted, the lens focal position 22 (D) is once set to the half-telephoto position.
(2) When the absolute focus position 21 (C) is reached, an extender is inserted and electronic zoom interpolation is performed so as to cancel the change in magnification accompanying the insertion.
(3) At this time, the lens driving speed is halved before insertion.
(4) Thereafter, the lens focal position D is moved to the target absolute focal position C.
2. When the extender is removed (1) When a zoom instruction that requires removal is received, the removal is performed immediately, and electronic zoom interpolation is performed so as to cancel the change in magnification caused by removal.
(2) Thereafter, the lens focal position D is moved to the target absolute focal position C. Also, electronic zoom interpolation is performed in accordance with the lens driving speed.

As described above, the extender is removed and the lens focal point position 22 is moved based on the matrix table shown in FIG. 4, and the electronic zoom interpolation process is performed as necessary to smoothly change the output absolute focal point 21. Zooming in and out is easy to see by enlarging / reducing the size of the subject.
In the present embodiment, the case where the magnification of the extender is two times is shown, but the same effect can be obtained even with an arbitrary magnification.

It is a block diagram of the surveillance camera apparatus which shows embodiment of this invention. It is operation | movement explanatory drawing of the zoom control which the camera control part of the surveillance camera apparatus which shows Embodiment 1 of this invention performs. It is explanatory drawing of the focus setting table referred when the camera control part of the surveillance camera apparatus which shows Embodiment 1 of this invention performs zoom control. It is a matrix table | surface explaining operation | movement of the camera control part of the surveillance camera apparatus which shows Embodiment 2 of this invention. In the surveillance camera device showing the second embodiment of the present invention, when an extender is inserted, it is an operation explanatory diagram when the lens focal point position moves from “4” to “14” which is half or less of the most telephoto position. In the surveillance camera device showing Embodiment 2 of the present invention, when an extender is inserted, it is an operation explanatory diagram when the lens focal position moves from “9” to “14” exceeding half the maximum telephoto position. In the surveillance camera device showing the second embodiment of the present invention, when the extender is removed, it is an operation explanatory diagram when the lens focal position moves from “14” to “4” which is half or less of the most telephoto position. In the monitoring camera device showing Embodiment 2 of the present invention, when the extender is removed, it is an operation explanatory diagram when the lens focal position moves from “14” to “9” exceeding half of the most telephoto position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Zoom lens, 8 Camera control part, 20 Focus setting table, 21 Absolute focus position, 22 Lens focus position

Claims (6)

In a zoom lens having an extender and a camera monitoring device having a control unit for controlling the driving of the zoom lens and the extender,
Focal point of the controller, the zoom lens set to the absolute focus position of an optical focal position corresponding to the zoom instruction, in response to insertion of insertion of the extender, and the extender that corresponds to the absolute focus position adjusting A focus setting table showing the lens focus position , which is the position ,
From the absolute focus position obtained by the's over arm instruction, the focus setting selects the absolute focal position of the table, when the required insertion of the extender from the selected the absolute focus position, the lens focus position the Rukoto drives the zoom lens to a maximum telephoto position / extender magnification, and, by performing interpolation in the electronic zoom, the absolute focus position is the maximum telephoto position, the absolute focus position is maximum telephoto position When it reaches, the extender is inserted and interpolated by electronic zoom so as to cancel the magnification change accompanying the insertion of the extender, and then the zoom lens is zoomed in the focus setting table from the maximum telephoto position / extender magnification. surveillance camera and moving to the lens focal position corresponding to the absolute focus position Location.   The lens focus position of the focus setting table is a value obtained by dividing the parameter of the absolute focus position by the magnification of the extender at a position where the extender is inserted beyond the most telephoto position of the lens focus position. The surveillance camera device according to claim 1. When the initial position of the zoom lens exceeds the maximum telephoto position / extender magnification, the control unit maximizes the drive speed of the zoom lens when driving the zoom lens until the lens focal position reaches the maximum telephoto position / extender magnification. The surveillance camera device according to claim 1 or 2, wherein When the extender is removed, the control unit performs electronic zoom interpolation so as to cancel the magnification change associated with the removal of the extender. After the removal is completed, the control unit moves the zoom lens to the lens focus position based on the zoom instruction. The surveillance camera device according to any one of claims 1 to 3 , wherein electronic zoom interpolation is performed according to a driving speed of the zoom lens until the absolute focal position of the zoom instruction is reached. Control unit, when inserting the extender, the monitoring camera apparatus according to any one of claims 1 to 4, characterized in that the speed / extender magnification before inserting the drive speed of the zoom lens. The monitoring camera device according to claim 1, wherein the control unit controls the zoom speed of the absolute focus position to be constant.

Images