JP2006033577A - Monitoring camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera capable of switching photography modes while a failure during the switching time of photography modes can be prevented surely. <P>SOLUTION: The camera capable of switching the photography modes includes an illuminance calculating means for calculating the illuminance of an object and an illuminance change ratio calculating means for calculating an illuminance change ratio. A switching condition of the photography mode can be set according to the illuminance change ratio. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera capable of switching shooting modes.

As a conventional example of a camera capable of switching such a shooting mode, there is a “camera with shooting mode switching function” described in Japanese Patent Laid-Open No. 2003-219254. This camera uses a CCD as a solid-state imaging device. The CCD has sensitivity characteristics from 400 nm to 1100 nm, but when used as a color camera, the wavelength that the human eye can detect is up to about 650 nm, and it is necessary to improve color reproducibility. An infrared cut filter is disposed in front of the CCD. On the other hand, when used as a black and white camera, the infrared cut filter is removed because the sensitivity is improved and the color reproducibility is not affected. Here, the black-and-white / color switching camera described in the above publication is used to prevent hunting during shooting in black-and-white mode such as at night or in parking lots, when sudden light such as car headlights enters, or during pan-tilt. In this case, a threshold level threshold is set when switching from the black and white mode to the color mode, and a threshold level is switched after a predetermined time has elapsed.
JP 2003-219254 A

  However, in the case where a threshold is provided as in the case of a conventional black / white / color switching camera, when monitoring a parking lot or the like in the black and white mode at night, temporary light such as a headlight of a car is used. It is not possible to cope with it sufficiently, and when the headlight comes in, it switches to color mode, and when the car passes, it switches to black and white again, and it can fully cope with the problem that the video signal is interrupted during the switching. There wasn't. In addition, when switching after a predetermined time has elapsed, even if the subject has sufficient illuminance capable of color imaging, it takes time to switch, and shooting in the black and white mode is not performed in the color mode. There was a problem. The present invention has been made in order to solve the conventional problems, and reliably prevents extra mode switching when temporary light is incident as described above when shooting in monochrome mode at night. An object of the present invention is to provide a camera system that can be switched quickly.

  The camera capable of switching the shooting mode according to claim 1 has an illuminance calculating means for calculating the illuminance of the subject and a means for calculating the illuminance change rate, and the shooting mode switching condition can be set according to the illuminance change rate. Therefore, it is possible to reliably prevent inappropriate shooting mode switching with respect to illuminance changes of various subjects, and to quickly switch shooting modes in scenes where shooting mode switching must be performed.

  The camera capable of switching the shooting mode according to claim 2 does not switch the shooting mode when the output from the illuminance change rate calculation means is equal to or greater than a predetermined value. It is possible to reliably prevent inappropriate shooting mode switching when light enters, and to quickly switch shooting modes in scenes where shooting mode switching must be performed when the illuminance of the subject changes. .

  In the camera capable of switching the shooting mode according to claim 3, the switching time when the output from the illuminance change rate calculating means is not less than a predetermined value can be set longer than the switching time when the output is not more than the predetermined value. Therefore, even when the room lights are turned on and the brightness changes during indoor monitoring, it is possible to reliably prevent inappropriate shooting mode switching and to switch shooting modes in scenes where shooting modes must be switched. Can be performed.

  According to a fourth aspect of the present invention, there is provided a camera capable of switching between photographing modes, wherein the photographing mode is switched when the predetermined subject illuminance and illuminance change rate calculated from the illuminance calculating means and the subject illuminance change rate calculating means satisfy a specific condition. Since conditions can be set, switching of shooting modes can be performed quickly in a scene where shooting modes must be switched under specific conditions, and inappropriate switching can be surely prevented.

  The camera capable of switching the shooting mode according to claim 5 does not switch the shooting mode when the output from the illuminance calculating means and the subject illuminance change rate calculating means is a predetermined subject illuminance and illuminance change rate. Therefore, it is possible to reliably prevent inappropriate shooting mode switching under specific conditions.

  The camera capable of switching the shooting mode according to claim 6 is for switching the shooting mode when the outputs from the illuminance calculating means and the subject illuminance change rate calculating means are a predetermined subject illuminance and illuminance change rate. In scenes where the shooting mode must be switched under specific conditions, the shooting mode can be switched quickly.

  The camera capable of switching the photographing mode according to claim 7 is configured such that when the outputs from the illuminance calculating means and the subject illuminance change rate calculating means are predetermined subject illuminance and illuminance change rate, the illuminance calculating means and the subject illuminance change Since the output from the rate calculation means can be set longer than the switching time for cases other than the predetermined subject illuminance and illuminance change, inappropriate shooting mode switching can be reliably prevented under certain conditions It becomes.

  The camera capable of switching the shooting mode according to claim 8 is configured such that when the outputs from the illuminance calculating means and the subject illuminance change rate calculating means are predetermined subject illuminance and illuminance change rate, the illuminance calculating means and the subject illuminance change Since the output from the rate calculation means can be set shorter than the switching time for cases other than the predetermined subject illuminance and illuminance change rate, the shooting mode should be used in scenes where the shooting mode must be switched under specific conditions. Can be switched quickly.

  The camera capable of switching the photographing mode according to claim 9 calculates the illuminance change rate of the subject using at least one of an output from the image sensor, an output from the image processing system, an aperture, a shutter speed, an AGC, and a light receiving element. Therefore, it is possible to know the illuminance change rate of the subject by observing at least one of the output from the image sensor, the output from the image processing system, the aperture, the shutter speed, the AGC, and the light receiving element.

  According to the first aspect of the present invention, since the switching condition can be set according to the illuminance change rate of the subject, it is possible to cope with the illuminance change of the subject that can be considered according to the installation location of the camera, and to ensure inappropriate mode switching. Therefore, when the scene has to be switched and the shooting mode must be switched, the shooting mode can be switched quickly.

  According to the invention of claim 2, since the factor of the illuminance change can be predicted with respect to the illuminance change of the subject in the vehicle headlight or pan / tilt temporarily, it is possible to surely prevent inappropriate photographing mode switching. It becomes.

  According to the invention of claim 3, during indoor monitoring, it is possible to reliably prevent inappropriate shooting mode switching with respect to a temporary change in illuminance of the subject during panning and tilting, and the brightness is changed due to the interior lighting. Even in this case, it is possible to switch the shooting mode.

  According to the fourth aspect of the present invention, since the factor of the subject illuminance change can be assumed from the illuminance of the subject and the illuminance change rate of the subject, the switching condition can be set according to the factor of the subject illuminance change. It is possible to reliably prevent an appropriate shooting mode from being switched and to quickly switch the shooting mode in a scene where the shooting mode must be switched.

  According to the invention of claim 5, since the factor of the subject illumination change can be assumed from the illumination intensity of the subject and the illumination change rate of the subject, it is inappropriate for the temporary illumination change of the subject due to a car headlight or the like. Therefore, it is possible to surely prevent a change in shooting mode.

  According to the invention of claim 6, since the factor of the subject illuminance change can be assumed from the illuminance of the subject and the illuminance change rate of the subject, switching of the photographing mode is performed with respect to the illuminance change such as when the room light is turned on. Can be performed quickly.

  According to the invention of claim 7, since the factor of the subject illumination change can be assumed from the illumination intensity of the subject and the illumination change rate of the subject, it is unnecessary for the temporary illumination change of the subject due to the headlight of the car or the like. It is possible to reliably prevent mode switching.

  According to the eighth aspect of the present invention, since the factor of the subject illuminance change can be assumed from the illuminance of the subject and the illuminance change rate of the subject, a scene in which the shooting mode must be switched when the room light is turned on, etc. Then, it becomes possible to quickly switch the shooting mode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a camera capable of switching shooting modes according to an embodiment of the present invention.

  1 to 5 in FIG. 1 perform a series of image processing operations. The CCD image sensor 1 includes a photoelectric conversion unit and a charge transfer unit, and outputs captured image information to be photographed as an analog signal. A color filter arranged in a predetermined order for each pixel is provided on the light receiving surface of the photoelectric conversion unit, and the output analog signal includes color information. The analog signal processing unit 2 performs predetermined analog processing (noise removal, gain adjustment, penny processing, etc.) on the signal output from the CCD image pickup device 1, and the A / D conversion unit 3 is an analog signal processing unit. 2 converts the analog imaging signal from 2 into a digital signal.

  The digital signal processing unit 4 includes a DSP, performs predetermined processing on the digital imaging signal from the A / D conversion unit 3, and outputs a luminance signal and a color signal for each pixel. The video output unit 5 uses the output signal from the digital signal processing unit 4 to generate and output a color video signal or a monochrome video signal. Whether to generate a color video signal or a black-and-white video signal depends on a shooting mode signal from the control unit 6 that also has a function of a mode determination unit.

  The control unit 6 controls the operation of the entire camera including the shooting mode determination process, and is configured mainly by a processor that operates according to a predetermined program. The shooting mode determination process will be described later.

  The drive unit 7 drives the optical LPF 9 and the infrared cut filter 10 according to a control signal from the control unit 6, and the optical LPF 9 and the infrared cut filter 10 are arranged on the front surface of the CCD image pickup device 1 in the color mode. Is done. The optical LPF 9 is for cutting off the high frequency range of the photographed image to remove false colors and the like, and the infrared cut filter 10 cuts the infrared component of the incident light to the CCD image sensor 1. Is to do.

  The switching operation of the camera configured as described above and capable of switching the shooting mode will be described. An imaging signal acquired by the CCD imaging device 1 is processed as an analog signal processing unit 2, an A / D conversion unit 3, a digital signal processing unit 4, and a video output unit 5, and is output as a video signal. When the photographing mode is the color mode, the optical LPF 9 and the infrared cut filter 10 are disposed on the front surface of the CCD image pickup device 1 and the video output unit 5 outputs a color video signal. When the shooting mode is the monochrome mode, the infrared cut filter 10 is removed from the front surface of the CCD image sensor 1, and the video output unit 5 outputs a monochrome video signal.

  The determination of the shooting mode is performed in the control unit 6. As shown in FIG. 2, in the illuminance calculation unit 6-1, the output from the CCD image sensor 1, the output from the analog signal processing unit 2, the output from the digital signal processing unit 4, and the digital signal processing unit 4 The illuminance of the subject is calculated from the AGC, aperture, shutter speed, or the output of the light receiving element 9 that can calculate the illuminance of the subject. When calculating the illuminance of the subject, at least one of the output from the CCD imaging device 1, the output from the analog signal processing unit 2, the output from the digital signal processing unit 4, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed. It is also possible to calculate the illuminance of the subject from the temporal relative value. The calculated subject illuminance is input to the memory 6-2 and the illuminance change calculator 6-3. The illuminance change calculation unit detects the illuminance change rate of the entire screen or a predetermined area of the screen. A calculation example of the illuminance change rate is shown in FIG. In this case, as shown in FIG. 3, it is calculated as an amount of change from the previous illuminance calculation value at every arbitrary fixed time. The change rate calculation time can be set at any time interval such as every reading from the image sensor, every field, every frame, every predetermined time, and the like. Further, when calculating the illuminance change rate of the subject, the output from the CCD image sensor 1 or the output from the analog signal processing unit 2, the output from the digital signal processing unit 4, and the digital signal processing unit 4 without calculating the illuminance. It is also possible to calculate from time-dependent changes in AGC, aperture, and shutter speed. In the shooting mode determination unit 6-4, the shooting mode is determined based on the subject illuminance from the illuminance calculation unit 6-1 and the illuminance change rate from the illuminance change calculation unit.

  The operation of the mode determination unit 6-4 will be described in detail. The illuminance Y of the subject changes due to lighting ON / OFF and the influence of sunlight, etc., and mode change thresholds Y1 and Y2 (Y1: threshold for changing from the monochrome mode to the color mode, Y2: threshold for changing from the color mode to the monochrome mode). If exceeded, it is determined whether or not to switch modes. At the time of shooting in the color mode, when the subject illuminance Y is equal to or less than the threshold value Y2 for switching from the color mode to the monochrome mode, the illuminance change rate is detected at an arbitrary time interval. The camera according to the present invention can arbitrarily set the shooting mode switching condition according to the detected change rate of the subject illuminance, and satisfies the switching condition set for each change rate of the subject illuminance. The mode is switched. When shooting in the monochrome mode, if the subject illuminance Y is greater than or equal to the threshold Y1 for switching from the monochrome mode to the color mode, the subject illuminance when the subject illuminance is greater than or equal to the threshold Y1 as in shooting in the color mode. The shooting mode switching condition can be arbitrarily set according to the change rate, and the shooting mode is switched when the switching condition set according to the change rate of each subject illuminance is satisfied.

  Next, shooting mode determination processing will be described using a flowchart.

  Switching from the monochrome mode to the color mode will be described with reference to FIG. In S401, it is determined whether or not the subject illuminance Y is greater than or equal to the threshold value Y1 for switching from the monochrome mode to the color mode. If it is equal to or less than the threshold value Y1, the monochrome mode is maintained as it is. If it is equal to or greater than the threshold Y1, in S402, switching patterns (1) to (3) are determined from the rate of change in illuminance when the threshold Y1 is exceeded. Although three patterns are used this time, the number is not limited to three, and any number may be used. If the pattern is determined in S402, it is determined in S403 to S405 whether the switching condition set for each change rate of the subject illuminance is satisfied, and if the switching condition is satisfied, the IR cut filter Insert and shoot in color mode.

  In switching from the color mode to the monochrome mode, as shown in the flowchart of FIG. 5, it is determined whether the subject illuminance Y is equal to or less than the threshold Y2 for switching from the color mode to the monochrome mode. As in the case of switching from the mode to the color mode, when the switching condition set for each change rate of illuminance when the threshold value Y2 or less is satisfied, switching to the monochrome mode is performed.

  In either the monochrome mode to the color mode or the color mode to the monochrome mode, it is possible not to consider the illuminance change rate of the subject at the time of switching, and to switch after a certain time exceeding the shooting mode switching threshold. .

  In addition, the rate of change in illuminance is not limited. If at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture value, and the shutter speed changes more than a predetermined value, the image processing system The shooting mode switching conditions may be set in accordance with the output of AGC, the AGC from the digital signal processing unit 4, the aperture, and the change rate of the shutter speed.

  Switching from the monochrome mode to the color mode will be described with reference to FIG. In S601, it is determined whether or not the subject illuminance Y is greater than or equal to the threshold value Y1 for switching from the monochrome mode to the color mode. If it is equal to or less than the threshold value Y1, the monochrome mode is maintained as it is. If it is equal to or greater than Y1, in S602, it is determined whether or not the change rate of illuminance is equal to or greater than the threshold value S1. When the change rate of the illuminance is equal to or greater than the threshold value S1, it is determined that temporary light such as a headlight has entered or that the pan / tilt is in progress, and the color mode is not switched. When the illuminance change rate is equal to or less than the threshold value S1, it is determined that the illuminance of the subject has decreased, and an IR cut filter is inserted after a predetermined time T1, and photographing in the color mode is performed. The set time of the predetermined time T1 can be set to a short time or 0 seconds, and quick switching can be performed.

  When switching from the color mode to the black and white mode, as shown in the flowchart of FIG. 7, it is determined whether the subject illuminance is less than or equal to the threshold Y2 for switching from the color mode to the black and white mode. In S702, it is determined whether or not the change rate of illuminance is equal to or greater than the threshold value S2. If the illuminance change rate is equal to or greater than the threshold value S2, it is determined that the illuminance change is temporary or pan-tilt is in progress, and switching to the monochrome mode is not performed. When the change rate of the illuminance is equal to or less than the threshold value S2, it is determined that the illuminance around the subject has decreased, and switching to the monochrome mode is performed after a predetermined time T2. If the set time of the predetermined time T2 is set to a short time or 0, quick and quick switching is possible.

  In either the monochrome mode to the color mode or the color mode to the monochrome mode, the illuminance change rate of the subject at the time of switching is not taken into account, and it is possible to switch after a certain time exceeding the shooting mode switching threshold. is there.

  In addition, it is not limited to the change rate of illuminance. When at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed changes more than a predetermined value, the shooting mode is switched. It does not matter if you do not.

  The switching from the monochrome mode to the color mode will be described with reference to FIG. In S801, it is determined whether or not the subject illuminance Y is equal to or higher than the threshold value Y1 for switching from the black and white mode to the color mode. If it is greater than or equal to the threshold Y1, in S802, it is determined whether or not the change rate of illuminance is greater than or equal to the threshold S1. If the change rate of the subject illuminance is less than or equal to the threshold value S1, it is determined that the illuminance of the subject has decreased, and an IR cut filter for the color mode is inserted after a predetermined time T1, and photographing in the color mode is performed. . If the set time of the predetermined time T1 is set to a short time or 0, quick and quick switching is possible. When the rate of change in illuminance is greater than or equal to the threshold S1, it is basically determined that temporary light such as a headlight has entered or that panning / tilting is in progress, and the time is longer than T1. During T3, only when stable, it is determined that the illuminance of the subject has decreased, and the mode is switched to the color mode.

  For switching from the color mode to the monochrome mode, as shown in the flowchart of FIG. 9, in S901, it is determined whether the subject illuminance is less than or equal to the threshold Y2 for switching from the color mode to the monochrome mode. Is determined to be greater than or equal to the threshold value S2. When the change rate of the subject illuminance is equal to or less than the threshold value S2, it is determined that the luminance around the subject has decreased, and switching to the monochrome mode is performed after a predetermined time T2. If it is S2 or higher, it is judged that the brightness is temporarily changed or pan / tilt is in progress, and the illuminance of the subject increases not only temporarily, but only temporarily when it is stable for T4 longer than T2. Switch to black and white mode.

  In either the monochrome mode to the color mode or the color mode to the monochrome mode, the illuminance change rate of the subject at the time of switching is not taken into account, and it is possible to switch after a certain time exceeding the shooting mode switching threshold. is there.

  In addition, it is not limited to the change rate of illuminance. When at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed changes more than a predetermined value, the shooting mode is switched. You can delay the time.

  The switching of the shooting mode when an illuminance change occurs under a certain condition will be described with reference to FIG. For example, if the illuminance of the subject changes due to the on / off of the room light during indoor monitoring, or if the illuminance of the subject changes due to a car headlight, etc., the illuminance is limited to a narrow range and the illuminance change rate is limited. The cause of the illuminance change of the subject can be estimated. In S1001, it is determined whether or not the subject is within a predetermined illuminance range (Y3 or more and Y4 or less) and within a predetermined illuminance change rate range (S3 or more and S4 or less). If it is within the predetermined illuminance range and illuminance change rate range, in S1002, it is determined whether or not the shooting mode switching conditions set in the predetermined illuminance range and illuminance change rate range are satisfied. If the shooting mode switching condition is satisfied, the shooting mode is changed. It is also conceivable that there are a plurality of ranges for performing this specific processing instead of one.

  The switching of the shooting mode when an illuminance change occurs under a certain condition will be described with reference to FIG. For example, when the headlight of a car enters when monitoring a night parking lot in black and white mode, and the illuminance of the subject changes, the illuminance of the limited narrow range and the change rate of the illuminance will result. The resulting illuminance change can be estimated. In S1101, it is determined whether the subject is within a predetermined illuminance range (Y3 or more and Y4 or less) and within a predetermined illuminance change rate range (S3 or more and S4 or less). When it is within the predetermined illuminance range and illuminance change rate range, even if the illuminance of the subject is sufficient, the photographing mode is not switched because it is a temporary luminance change. It is also conceivable that there are a plurality of ranges for performing this specific processing instead of one.

  In addition, the rate of change in illuminance is not limited. If at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed changes within a predetermined range, It does not matter if switching is not performed.

  The switching of the shooting mode when an illuminance change occurs under a certain condition will be described with reference to FIG. For example, when the illuminance of the subject changes due to the ON / OFF of the room light during indoor monitoring, the illuminance is limited to a narrow range and the change rate of the illuminance. Illuminance change caused by ON / OFF can be estimated. In S1201, it is determined whether the subject is within a predetermined illuminance range (Y3 or more and Y4 or less) and within a predetermined illuminance change rate range (S3 or more and S4 or less). If it is within the predetermined illuminance range and illuminance change rate range, it is determined that the illuminance change of the subject is steady, and the shooting mode is switched. In addition, the rate of change in illuminance is not limited. If at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed changes within a predetermined range, Switching may be performed.

  With reference to FIG. 13, description will be given of switching of shooting modes when a change in illuminance occurs under a certain condition. For example, when the headlight of a car enters when monitoring a night parking lot in black and white mode, and the illuminance of the subject changes, the illuminance of the limited narrow range and the change rate of the illuminance will result. The resulting illuminance change can be estimated. In S1301, it is determined whether or not the subject is within a predetermined illuminance range (Y3 or more and Y4 or less) and within a predetermined illuminance change rate range (S3 or more and S4 or less). If within the predetermined illuminance range and illuminance change rate range, even if the illuminance of the subject is sufficient, it is stable for T5 longer than the switching time of the normal shooting mode as a temporary luminance change. Otherwise, switching will not be performed. It is also conceivable that there are a plurality of ranges for performing this specific processing instead of one.

  In addition, the rate of change in illuminance is not limited. If at least one of the output from the image processing system, the AGC from the digital signal processing unit 4, the aperture, and the shutter speed changes within a predetermined range, Switching may be delayed.

  Referring to FIG. 14, the switching of the shooting mode when an illuminance change under a certain condition occurs will be described. For example, when the illuminance of the subject changes due to the ON / OFF of the room light during indoor monitoring, the illuminance is limited to a narrow range and the change rate of the illuminance. Illuminance change caused by ON / OFF can be estimated. In S1401, it is determined whether or not the subject is within a predetermined illuminance range (Y3 or more and Y4 or less) and within a predetermined illuminance change rate range (S3 or more and S4 or less). If it is within the predetermined illuminance range and illuminance change rate range, it is determined that the illuminance change of the subject can be considered, and switching of the shooting mode is stable for T6 which is shorter than the normal shooting mode switching time. I do.

  Further, the rate of change in illuminance is not limited, and the output from the CCD image sensor 1 or the output from the analog signal processing unit 2, the output from the digital signal processing unit 4, the AGC from the digital signal processing unit 4, an aperture, and a shutter When at least one value of the speed changes within a predetermined range, switching of the shooting mode may be accelerated.

An embodiment of the present invention will be described with reference to the timing chart of FIG.
During the time (1), photographing in the color mode is performed. Since the illuminance of the subject has gradually decreased during the time (2), it is determined that the scene has to be switched from one shooting mode to another, such as when the sun goes down. Switching to black and white mode is performed. During the time of (3), since it becomes brighter rapidly, the change rate of the illuminance of the subject is not less than the threshold value S1 and is not more than the threshold value Y1 from the black and white mode to the color mode stably for a long time. Do not switch to color mode because it is determined to be in the middle. During the time of (4), since the illuminance of the subject gradually increases, it is determined that the scene has to be switched to the shooting mode due to sunrise or the like, and the color mode is quickly switched. In the time of (5), although the subject illuminance has suddenly decreased, it is stable for a certain period of time, so it is determined that the illuminance of the subject has decreased rather than temporarily, and the mode is switched to the monochrome mode.

Schematic configuration diagram of a camera according to an embodiment of the present invention The schematic block diagram of the control part of this invention embodiment Illumination change rate detection example of the embodiment of the present invention Processing flow diagram from the monochrome mode to the color mode according to the first embodiment of the present invention Process flow diagram from color mode to black-and-white mode in embodiment 1 of the present invention Process flow diagram from monochrome mode to color mode of embodiment 2 of the present invention Processing flow diagram from color mode to black-and-white mode in embodiment 2 of the present invention Process flow diagram from monochrome mode to color mode of embodiment 3 of the present invention Process flow diagram from color mode to black-and-white mode in embodiment 3 of the present invention Process flow diagram of embodiment 4 of the present invention Process flow diagram of embodiment 5 of the present invention Process flow diagram of embodiment 6 of the present invention Process flow diagram of embodiment 7 of the present invention Process flow diagram of embodiment 8 of the present invention Time chart of the embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 CCD imaging device 2 Analog signal processing part 3 A / D conversion part 4 Digital signal processing part 5 Video output part 6 Control part 7 Drive part 8 Imaging optical system 9 Optical LPF
DESCRIPTION OF SYMBOLS 10 Infrared cut filter 6-1 Illuminance calculation part 6-2 Memory 6-3 Illuminance change calculation part 6-4 Shooting mode determination part

Claims (9)

  An imaging device that forms an image of light incident from the outside as an image, a specific wavelength removal unit provided in the imaging optical path, an insertion / removal unit that inserts and removes the specific wavelength removal unit in the imaging optical path, and an illuminance of the subject Illuminance calculating means for calculating the illuminance and illuminance change rate calculating means for calculating the illuminance change rate of the subject. When the illuminance of the subject is sufficient, the specific wavelength removing means is inserted, and the illuminance of the subject is insufficient. In the case of a camera having a photographing mode switching means for taking an image after leaving the specific wavelength removing means, the camera has a setting means capable of setting a photographing mode switching condition based on an illuminance change rate of the subject. A camera characterized in that the photographing mode is switched based on the designated switching condition.   2. The camera according to claim 1, wherein when the output from the illuminance change rate calculating means is a predetermined value or more, the photographing mode is not switched.   2. The camera according to claim 1, wherein when the output from the illuminance change rate calculating means is equal to or greater than the predetermined value, the switching time is set longer than the switching time when the output is equal to or less than the predetermined value. Camera characterized by.   2. The camera according to claim 1, wherein when the outputs from the illuminance calculating means and the illuminance change rate calculating means are the illuminance and illuminance change rate of the subject within a predetermined range, the illuminance and illuminance change rate of the predetermined subject are set. A camera having means capable of switching to a shooting mode set in accordance with the setting and setting a switching condition, and switching the shooting mode based on the set switching condition.   5. The camera according to claim 4, wherein when the outputs from the illuminance calculating means and the illuminance change rate calculating means of the subject are the illuminance and illuminance change rate of the subject within a predetermined range, the shooting mode is switched. A camera characterized by not.   5. The camera according to claim 4, wherein when the outputs from the illuminance calculating means and the illuminance change rate calculating means are the illuminance and illuminance change rate of the subject within a predetermined range, the shooting mode is switched. Features a camera.   5. The camera according to claim 4, wherein when the outputs from the illuminance calculating means and the illuminance change rate calculating means are the illuminance and illuminance change rate of the subject within a predetermined range, The camera is characterized in that the output from the illuminance change rate calculating means is set longer than the switching time in the case other than the illuminance of the predetermined subject and the illuminance change rate.   5. The camera according to claim 4, wherein when the outputs from the illuminance calculating means and the illuminance change rate calculating means are illuminance and illuminance change of a subject within a predetermined range, the illuminance calculating means and the illuminance change rate. A camera characterized in that the output from the calculation means is set shorter than the switching time when the illuminance of the predetermined subject and the illuminance change rate are other than those.   9. The camera according to claim 1, wherein the subject illuminance change rate calculating means uses at least one of an output from the image sensor, an output from an image processing system, an aperture, a shutter speed, an AGC, and a light receiving element. A camera characterized by calculating.

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