CN106534663A - Imaging apparatus - Google Patents

Abstract

The invention provides an imaging apparatus which can suppress error operation during automatic correction of unintelligibility during image shooting through simple processing. The imaging device (1) includes an imaging unit (10) for imaging light from a target area on an imaging element (14), an image processing unit (21) for processing a signal output from the imaging element (14) and outputting image information, and a storage unit (22) for storing a reference value of a parameter indicating a sharpness of the captured image. The image processing unit (21) acquires the measured value of the parameter according to the signal inputted by the imaging element (14), stores the measured value obtained at a specific time point as a reference value in the storage unit (22), and conduct sharp processing for the captured image according to the difference between the obtained measured value and the reference value stored in the storage unit (22).

Description

Camera head

Technical field

The present invention relates to a kind of camera head in photographic subjects region, being especially suitable for image-capturing resolution may be because The camera head during landscape for producing rain or mist etc. and reducing.

Background technology

Known utilization monitoring camera shoots the camera head of street or intersection.This camera head will be photographed Image is used for identification of such as vehicle accident etc..In authentication, the situation or traffic light of vehicles or pedestrians are able to confirm that Light situation etc..I.e. it is capable to confirm that traffic light are lighted with red, blue, yellow which kind of color during accident.

However, the contrast of subject may be caused in the generation of street or intersection etc., Yin Yu or mist Reduce.For example, if intersection fogged-in, then just there is the situation or traffic that cannot be clearly captured vehicles or pedestrians The worry for lighting situation etc. of signal lighties.Thus, it is impossible to successfully carry out the identification using shooting image.

In following patent documentation 1, a kind of monitoring camera system for possessing monitoring camera device and control device is recite System.In the monitoring camera system, the image according to captured by monitoring camera device detects mist or rosy clouds using control device.Mist Or the generation of rosy clouds is to detect in the following manner：The advance image for shooting is compared with current image, according to its result Whether produce fubai and detect.In addition, the intensity of mist or rosy clouds is become according to the lightness of image in digital image signal composition Whether the level (black peak level) of minimum part exceeds specific threshold value to judge.Mist or rosy clouds are detected so, and then, such as Fruit determines the intensity of mist or rosy clouds, and just alarm corresponding with the intensity of mist or rosy clouds is exported to external equipment from control device.Separately Outward, carry out rosy clouds amendment corresponding with the intensity of the mist or rosy clouds that are determined.

[background technology document]

[patent documentation]

[patent documentation 1] Japanese Patent Laid-Open 2014-192762 publication

The content of the invention

[invention problem to be solved]

As described above, in the method for patent documentation 1, be correction map picture and must carry out mist or rosy clouds detection survey, and mist or The process for judging the two steps of the intensity of rosy clouds.Whether the judgement of the intensity of mist or rosy clouds is beyond specific according to black peak level Threshold value carrying out, thus, for example in the landscape for such as uprising the black peak level of script signal of video signal as reference object In the case of, there is repairing center to produce the worry of misoperation.

In view of the problem, it is an object of the invention to provide a kind of camera head, can be suppressed by simple process Misoperation in the case where the indistinctness to shooting image is corrected automatically.

[technological means of solve problem]

The Main Morphology of the present invention is related to a kind of camera head.The camera head of this form possesses：Image pickup part, makes from mesh The light in mark region is imaged in imaging apparatuss；Image processing part, the signal to exporting from the imaging apparatuss are processed and are exported Image information；And storage part, the reference value of the specific parameter of the definition of storage expression shooting image.Here, the figure As processing unit obtains the measured value of the parameter according to the signal being input into from the imaging apparatuss, and will take in specific time point Measured value be stored in the storage part as the reference value, according to the measured value for obtaining afterwards be stored in described in deposit The difference of the reference value in storage portion, performs the sharpening to shooting image and processes.

According to the camera head of this form, set according to the signal being input into from imaging apparatuss and represent the clear of shooting image The reference value of the parameter of degree, therefore set reference value is corresponding with the landscape of reference object.For example, in order to shoot intersection Crossing and in the case that camera head is set, the target such as reference value and setting situation of scale or traffic light of intersection The landscape (layout of structure etc.) in region is corresponding.And, obtain during shooting according to the reference value of such setting and afterwards Measured value difference and perform and the sharpening of shooting image processed, therefore, it is possible to suitably recognize the target area of reference object It is unintelligible reached which kind of degree, and the misoperation that sharpening processes can be suppressed.Thus, being filled according to the shooting of this form Put, the misoperation in the case where the indistinctness to shooting image is corrected automatically can be suppressed.

In addition, according to the camera head of this form, being appropriately performed at sharpening according to reference value and differing from for measured value Reason, therefore need not be additionally carried out detecting whether shooting image becomes unsharp process.Thus, filled according to the shooting of this form Put, can be by the simple sharpening processed to carry out shooting image.

Additionally, so-called " difference of measured value and reference value ", refers not only to the value by obtained by measured value deducts reference value, and Ratio etc. of the measured value relative to reference value is may also mean that, as long as the value that measured value is differed with reference value is represented, just It can be arbitrary value.

In the camera head of this form, can constitute as follows：Described image processing unit is accepting what setting was indicated In the case of input, using the measured value of the parameter acquired by signal of the basis from the imaging apparatuss as the benchmark Value and be stored in the storage part.Consequently, it is possible to successfully can avoid obtaining and setting in the unsharp time point in target area Reference value.Therefore, it is possible to more reliably suppress the malfunction in the case where the indistinctness to shooting image is corrected automatically Make.

In the camera head of this form, can constitute as follows：The storage part is and the 1st base based on measured value Quasi- value dividually prestores the 2nd reference value.In this case, can constitute as follows：Described image processing unit is setting In the case of using the pattern based on the 1st reference value of measured value, the 1st reference value is obtained according to measured value and is held The row sharpening is processed, and in the case where the pattern is not set, is performed at the sharpening according to the 2nd reference value Reason.Consequently, it is possible to for example, do not set as the clearly shooting image mutually suitable with the setting of the 1st reference value cannot be obtained In the case of pattern using the 1st reference value, it is also possible to sharpening process is performed using the 2nd reference value.

In the camera head of this form, can constitute as follows：Described image processing unit according to the measured value with The difference of the reference value and switch to make the adjusted value of shooting image sharpening.In this case, the adjusted value can be set to The value of gamma correction is carried out to the signal to exporting from the imaging apparatuss.Thus, by adjustment to carry out gamma correction Value, the contrast of shooting image successfully can be adjusted to the state for being suitable to sharpening by easy process.

Additionally, in the camera head of this form, as the parameter of the definition for representing shooting image, can be using for example The standard deviation of the brightness acquired by signal from the image exported from imaging apparatuss.By so using the standard deviation of brightness Difference, can grasp the indistinctness of shooting image exactly.

[The effect of invention]

As above, according to the present invention, it is possible to provide a kind of camera head, can be suppressed to shooting figure by simple process The indistinctness of picture corrected automatically in the case of misoperation.

The effect or meaning of the present invention can be by the explanation of embodiment shown below definitely.But, with Lower shown embodiment simply implements the illustration during present invention eventually, and the present invention is not at all remembered by implementation below Carry the restriction of content.

Description of the drawings

Fig. 1 is the block diagram of the composition of the camera head for representing embodiment.

Fig. 2 is the block diagram of the composition of the image processing part for representing embodiment.

Fig. 3 (a)～(d) is the figure of the situation with the histogrammic relation of brightness of the shooting image of illustrated embodiment.

Fig. 4 (a)～(d) is the modification method (sharpening process) of the contrast of the shooting image for illustrating embodiment Figure.

Fig. 5 (a), (b) are the histogrammic changes for representing the brightness in the case of the gamma value changes for making embodiment Figure.

Fig. 6 (a), (b) be represent shooting image although embodiment it is clear, histogrammic Luminance Distribution scope it is narrower In the case of target area configuration example figure.

Fig. 7 is the flow chart of the sharpening process for representing embodiment.

Fig. 8 is the figure of of the gamma characteristic for representing that the sharpening for embodiment is processed.

Fig. 9 (a), (b) are the figures of the effect of the sharpening process for schematically showing embodiment.

Specific embodiment

Hereinafter, referring to the drawings, embodiments of the present invention are illustrated.Present embodiment is to apply the present invention to clap Take the photograph the monitoring camera in intersection or street etc..

Fig. 1 is the figure of the composition for representing camera head 1.

Camera head 1 possesses image pickup part 10, image processing part 21, storage part 22, optical filter drive division 23, aperture drive division 24th, input unit 25 and output section 26.

Image pickup part 10 possesses camera lens 11, aperture 12, optical filter 13 and imaging apparatuss 14.

Camera lens 11 captures the light from target area, the picture of target area is imaged in the sensitive surface of imaging apparatuss 14.Light Circle 12 limit in the way of appropriate light quantity is incident to imaging apparatuss 14 from the strong and weak of the light of target area by basis from Outside light.Aperture 12 is adjusting hole mass runoff by aperture drive division 24.

Optical filter 13 comprising to remove ultrared IR (Infrared, infrared) edge filters and make infrared ray also and The white glass (dummy glass) that visible ray is passed through together.Optical filter 13 is via optical filter drive division 23 and by image Reason portion 21 and any one by IR edge filters and white glass are positioned in the light path between aperture 12 and imaging apparatuss 14.Tool For body, in the case of the illumination of more than usual level is obtained in imaging apparatuss 14, IR edge filters are inserted into into light path, Remove infrared ray.In addition, in the case that the illumination obtained in imaging apparatuss 14 is low, white glass being inserted into light path, being made red Outside line is also directed into imaging apparatuss 14 together with visible ray, so as to improve sensitivity.

Imaging apparatuss 14 are colored CMOS (Complementary Metal Oxide Semiconductor, complementary gold Category oxide semiconductor) image sensor.Imaging apparatuss 14 can also be CCD (Charge Coupled Device, electric charge coupling Close element) image sensor.Imaging apparatuss 14 will letter corresponding with shooting image by the control from image processing part 21 Number export to image processing part 21.

Image processing part 21 possesses the calculation process such as CPU (Central Processing Unit, central processing unit) electricity Road, performs image procossing according to the program for being stored in storage part 22.Storage part 22 possess ROM (Read Only Memory, only Read memorizer) or the storage media such as RAM (Random Access Memory, random access memory), except keeping image procossing Outside program, working region is also served as when processing by image processing part 21.Maintain in storage part 22 and shooting The corresponding multiple gamma correction values of level of the definition of image.With reference to Fig. 8, the gamma correction value to being maintained at storage part 22 is entered The additional explanation of row.

Optical filter drive division 23 and aperture drive division 24 are to be driven by the control from image processing part 21 respectively The driver of dynamic optical filter 13 and aperture 12.Input unit 25 has the input mechanisms such as operation button, accepts the instruction from user. Image information after being processed by image processing part 21 is exported to external equipment by output section 26 via lead-out terminal.

Fig. 3 is the functional block diagram of image processing part 21.

Image processing part 21 possess mosaic processing portion 101, linear matrix processing unit 102, gamma correction processing unit 103, Y/C separating treatment portion 104, contour revising processing unit 105, aberration correcting process portion 106 and noise removal process portion 107,108.

The signal exported from the imaging apparatuss 14 of Fig. 1 is input to mosaic processing portion 101.Mosaic processing portion 101 from Signal from each pixel produces R, G, B trichroism signal.Linear matrix processing unit 102 pairs is by 101 institute of mosaic processing portion The signal of generation implements dichroism amendment.

The signal that gamma correction processing unit 103 pairs has completed dichroism amendment implements gamma correction.As described above, storage In portion 22, multiple gamma correction values corresponding with the level of the definition of shooting image are maintained.For gamma correction processing unit 103, apply gamma correction value corresponding with the definition of shooting image.Gamma correction processing unit 103 utilizes applied gamma Correction value implements gamma correction to the signal from linear matrix processing unit 102.

The Signal separator for having been carried out gamma correction is luminance signal and colour difference signal by Y/C separating treatment portion 104.Profile is repaiied Positive processing unit 105 chooses the profile of subject according to the signal after mosaic processing, and the luminance signal after separating to Y/C is applied Plus contour signal.Aberration correcting process portion 106 is implemented to emphasize the Corrections Division of particular color etc. by the colour difference signal after Y/C separation Reason.Noise removal process portion 107,108 removes the noise that the luminance signal after being separated with Y/C and colour difference signal are overlapped respectively. The luminance signal and colour difference signal for removing noise is output to the output section 26 of Fig. 1.Output section 26 is believed by luminance signal with aberration Export to outside after number carrying out serial conversion.

Secondly, with reference to Fig. 3 (a)～Fig. 6 (b), the sharpening process to image processing part 21 is illustrated.Additionally, here For convenience, using the landscape beyond intersection or street as subject.

Fig. 3 (a)～(d) is of the histogrammic relation of the situation of the shooting image for representing embodiment and brightness Figure.Fig. 3 (b) is the rectangular histogram of the shooting image for Fig. 3 (a), and Fig. 3 (d) is the rectangular histogram of the shooting image for Fig. 3 (c). Additionally, Fig. 3 (a), (c) are actually colored image.That is, the mosaic ceramic tile in image carries various face with doll Color.In addition, the shooting image of Fig. 3 (c) be fog filter (foggy filter) is inserted in image pickup optical system it is captured.

As shown in Fig. 3 (b), (d), even if subject is identical, the Luminance Distribution scope (R1, R2) in rectangular histogram also can root Change according to the definition of shooting image.Specifically, distribution R2 in the case of shooting image is unsharp compares shooting figure As distribution R1 in the case of clearly it is narrow.Thus, the definition (contrast) of shooting image is more reduced, Luminance Distribution scope It is narrower.The definition of shooting image is detected therefore, it is possible to the distribution according to brightness.

Additionally, the information of the definition to judge shooting image is not limited to the rectangular histogram of brightness.For example, can also make Statistical data with auto iris etc. is judging the definition of shooting image.

Fig. 4 (a)～(d) is the figure of the modification method (sharpening process) of the contrast for illustrating shooting image.Fig. 4 (a), C () is the rectangular histogram shown in Fig. 3 (b), (d) respectively, and corresponding with the rectangular histogram of Fig. 3 (a), the shooting image of (c).In addition, Fig. 4 (b), (d) be respectively schematically show brightness rectangular histogram be Fig. 4 (a), (b) in the case of gamma correction value (Gamrat Property) curve chart.In Fig. 4 (a), (b), transverse axis is the signal level of input signal, and the longitudinal axis is the output letter after gamma correction Number signal level.

As shown in Fig. 4 (a), in the case of the Luminance Distribution scope R1 width in rectangular histogram, using logical shown in Fig. 4 (b) Normal gamma correction value carries out gamma correction.On the other hand, shown in such as Fig. 4 (c), when Luminance Distribution scope R2 in rectangular histogram it is narrow In the case of, gamma correction is carried out using the gamma correction value to improve the contrast shown in Fig. 4 (d).

In the gamma correction value of Fig. 4 (d), input signal of the signal level less than scope W is converted to into minimum level without exception Output signal.In addition, the input signal that signal level is higher than scope W to be converted to the output signal of maximum level without exception.Cause This, the input signal of black neighbouring ash is converted to without exception it is black, will it is white near ash input signal be converted to without exception it is white.By This, the contrast of image is improved.

Fig. 5 (a), (b) are the histogrammic changes for representing the brightness in the case of changing gamma value (gamma characteristic) Figure.In Fig. 5 (a), it is gamma characteristic used in the common gamma correction in the case of 0.45 that dotted line is gamma value, solid line Be the definition (contrast) of shooting image it is low in the case of the gamma characteristic applied.In Fig. 5 (a), the longitudinal axis is with 1 mark with transverse axis Standardization.In addition, in Fig. 5 (b), dotted line is the gal of the dotted line that the gamma value to specific shooting image application Fig. 5 (a) is 0.45 Rectangular histogram in the case of agate characteristic, solid line are the gammas of the solid line of the low contrast to same shooting image application Fig. 5 (a) Rectangular histogram in the case of characteristic.

As shown in Fig. 5 (b), if using low contrast with gamma characteristic carry out gamma correction, then revised bat The rectangular histogram of image is taken the photograph compared with before amendment, Luminance Distribution scope is significantly expanded.I.e. it is capable to by low to definition The low contrast of shooting image application Fig. 5 (a) of low contrast with gamma characteristic carry out gamma correction to improve the clear of image Clear degree (contrast).

As described above, the contrast of shooting image can be improved by selecting gamma correction value to be applied.The figure of Fig. 1 As processing unit 21 is in the case where the definition (contrast) of shooting image is low, by the gamma correction processing unit 103 for changing Fig. 2 The gamma value (gamma characteristic) of middle application is improving the contrast of shooting image.

In more detail, the gamma value (gamma applied in the case that the storage part 22 of Fig. 1 will be the definition of shooting image low Characteristic) store together with the common gamma value (gamma characteristic) in the case of high definition.Image processing part 21 is by imaging In the case that the definition (contrast) of the shooting image captured by element 14 is low, select to be suitable to the shooting image from storage part 22 Definition gamma value, and selected gamma value is applied to the gamma correction processing unit 103 of Fig. 2.Thereby, it is possible to improve The definition of shooting image.

Here, whether the definition of shooting image is low, can be according to the rectangular histogram of the Luminance Distribution as shown in Fig. 3 (a)～(d) To judge.

However, there is situations below according to shooting image：Although definition is not reduced, because of the layout etc. of subject And make histogrammic Luminance Distribution narrow range.The Nogata of shooting image (actually coloured image) for example, shown in Fig. 6 (a) Figure such as Fig. 6 (b).In the rectangular histogram, although shooting image is clear, Luminance Distribution scope R3 is narrow.In this case, if application The gamma value of low contrast, then the definition of shooting image can be reduced on the contrary.

Therefore, the mistake in present embodiment, in the case of carrying out suppressing to correct automatically unsharp shooting image The process of action.

Fig. 7 is the flow chart for representing the sharpening process carried out by image processing part 21.

In the flow chart of figure 7, as represent shooting image definition parameter, using brightness rectangular histogram (for example With reference to Fig. 3 (b), (d)) standard deviation.In addition, in the storage part 22 of Fig. 1, except the feelings being stored with common definition Outside the gamma value G3 applied under condition, be also stored with two kinds of gamma values G1, the G2 applied in the case where definition is low.

Further, in the flow chart of figure 7, before the processing can start or after beginning, can be by shown in user be via Fig. 1 Input unit 25 and carry out sharpening process pattern setting.Here, by the shooting image obtained according to photographic subjects region The referred to as default connection pattern of the pattern of the reference value σ Ref of established standardses deviation, is maintained at the general mark of storage part 22 in advance Quasi- deviations 0 are set as the referred to as default Disconnected mode of the pattern of reference value σ Ref.Standard deviation 0 is, for example, to be clapped with clearly state Take the photograph the standard deviation of the brightness histogram of the shooting image obtained by the landscape of standard.

With reference to Fig. 7, if switching on power to camera head 1 and completing initialization process, then image processing part 21 starts Shooting action.Thus, after shooting action is started, image processing part 21 determines whether vertical synchronizing signal (Vsync) Output time point (S101).(the S101 in the case of the output time point for vertical synchronizing signal：YES (YES)), image processing part 21 Perform auto iris (S102) is processed with AWB process (S103).Further, image processing part 21 is according to from imaging apparatuss 14 output signals and calculate the standard deviation (S104) of the brightness histogram of shooting image.

Subsequently, whether the pattern that the sharpening that image processing part 21 is set in judging camera head 1 is processed is as default connection Pattern (S105).Here, (the S105 in the case of the pattern non-default connection pattern of sharpening process：NO (no)), image The general standard deviation 0 for being stored in advance in storage part 22 is set as processing unit 21 the reference value σ Ref of standard deviation (S108)。

On the other hand, (the S105 in the case that the pattern of sharpening process is default connection pattern：YES), image procossing Whether portion 21 judges the pattern of the output time point sharpening process in previous vertical synchronizing signal as default Disconnected mode, also It is whether the pattern of sharpening process switches to default connection pattern (S106) from default Disconnected mode.Here, when previous The pattern that the output time point sharpening of vertical synchronizing signal is processed is (S106 in the case of default Disconnected mode：YES), at image The standard deviation calculated in step S104 is set as reference value σ Ref by reason portion 21, and set reference value σ Ref is deposited Storage is in storage part 22 (S107).

In addition, when the pattern that the output time point sharpening in previous vertical synchronizing signal is processed is also default connection pattern In the case of (S106：NO), it is, in the case of in being once to continue when default connection pattern in the past, image processing part 21 Step S107 is skipped, process is advanced to into step S109.In this case, at least it is front once before vertical synchronizing signal it is defeated Go out time point, reference value σ Ref is set based on the standard deviation in the shooting image acquired by the time point, and the reference value is at this The output time point of secondary vertical synchronizing signal is also effective.

Subsequently, image processing part 21 obtains ginseng by reference value σ Ref divided by acquired standard deviation in step S104 According to value (S109).The reference value for so calculating more hour compared with reference value σ Ref when the standard deviation that obtains in step S104 It is then bigger.That is, this obtain the brightness histogram for shooting image Luminance Distribution scope with correspond to benchmark The Luminance Distribution scope of the brightness histogram of value σ Ref is compared narrower, then reference value is bigger.Therefore, reference value is bigger, then can comment The definition for estimating the shooting image of this acquirement is lower.

After so calculating reference value, image processing part 21 is by threshold value Th1, Th2 set in advance (Th1 ＞ Th2) and joins (S110, S112) is compared according to value.Here, if reference value is more than threshold value Th1 (S110：YES), then image processing part 21 The gamma value G1 that will be stored in the low definition in storage part 22 is applied to the gamma correction processing unit 103 (S111) of Fig. 2.Separately Outward, if reference value is below threshold value Th1 and is more than threshold value Th2 (S110：NO, S112：YES), then image processing part 21 will The gamma value G2 of the low definition being stored in storage part 22 is applied to the gamma correction processing unit 103 (S113) of Fig. 2.Separately Outward, (S110 in the case of being below threshold value Th2 when reference value：NO, S112：NO), image processing part 21 will be stored in storage part The gamma value G3 of the common definition in 22 is applied to the gamma correction processing unit 103 (S114) of Fig. 2.The gamma of Fig. 2 is repaiied Positive processing unit 103 performs gamma correction according to such gamma value applied.

Then, image processing part 21 judges whether the output time point of vertical synchronizing signal terminates (S115).If vertical same The output time point of step signal terminates (S115：YES), then process is back to step S101 by image processing part 21, wait next The arrival (S101) of the output time point of individual vertical synchronizing signal.Then, if the output time point of next vertical synchronizing signal is arrived Carry out (S101：YES), then image processing part 21 performs S102 later process again.Power supply quilt of the process in camera head 1 Performed before blocking repeatedly.

Fig. 8 is the figure of the gamma characteristic for schematically showing gamma value G1, G2, G3.

As shown in figure 8, gamma value G2 is set to, relative to gamma value G3 by scope W2 of the low level side of input signal The output signal of zero level is modified to, and compared with gamma value G3, the high-side of input signal is quickly close to maximum level. In addition, gamma value G1 is set to, scope W1 of input side expands compared with scope W2 of gamma value G2, and with gamma value G2 phases Than the high-side of input signal is quickly close to maximum level.

By so setting gamma value G1, G2, and as with reference to illustrated by Fig. 5 (a), (b), using gamma value G2 In the case of carrying out gamma correction, compared with the situation of gamma correction is carried out using common gamma value G3, shooting image it is clear Clear degree (contrast) is improved.In addition, in the case where gamma correction is carried out using gamma value G1, carrying out gal with using gamma value G2 The situation of agate amendment is compared, and the definition (contrast) of shooting image is further improved.

Therefore, the step of Fig. 7 in S110, it is more than threshold value Th1, that is, the definition of shooting image in judgement reference value In the case that reduction is rapid, gamma is carried out by gamma value G1 is applied to gamma correction processing unit 103 (with reference to Fig. 2) and repaiied Just, the sharpening of shooting image can effectively be carried out.In addition, the step of Fig. 7 in S112, judging reference value more than threshold value Th2, that is, the definition of shooting image be reduced to it is moderate in the case of, by gamma value G2 is applied to gamma correction Processing unit 103 can effectively carry out the sharpening of shooting image without carrying out to shooting image carrying out gamma correction The sharpening of degree is processed.

Fig. 9 is the figure for schematically showing the shooting image in the case that camera head 1 is arranged on intersection.

Fig. 9 (a) represents the state for reducing because of the impact of rain or mist etc. the definition of shooting image.Present embodiment In, as described above, the level that reduces of the definition of size according to reference value, namely shooting image and apply appropriate gamma Value, therefore such as Fig. 9 (b), can improve the definition of shooting image.Thus, user can be true exactly according to shooting image Recognize the situation of traffic light 2, intersection 3, people 4 and automobile 5.

Effect ＞ of ＜ embodiments

According to present embodiment, following effect can be played.

Such as the step of Fig. 7 shown in S104, S107, according to the signal being input into from imaging apparatuss 14, setting represents shooting image Definition parameter (standard deviation of brightness histogram) reference value σ Ref.Therefore, set reference value σ Ref becomes Value corresponding with the landscape of reference object.For example, as shown in Fig. 9 (a), (b), shooting is being set in order to shoot intersection 3 In the case of device 1, reference value σ Ref becomes the target areas such as the setting situation of scale or traffic light 2 with intersection 3 Landscape (layout of structure etc.) the corresponding value in domain.Then, during shooting according to the reference value σ Ref of such setting and hereafter Difference (the reference value of acquired measured value (standard deviation)：σ Ref/ σ), perform the sharpening to shooting image and process, therefore Can accurately recognize which kind of degree the unintelligible of target area of reference object has reached, the mistake that sharpening can be suppressed to process Action.Thus, according to the camera head 1 of present embodiment, the feelings in the indistinctness of amendment shooting image automatically can be suppressed Misoperation under condition.

In addition, according to the camera head of present embodiment, according to reference value σ Ref and the difference of measured value (standard deviation) (reference value：σ Ref/ σ) and sharpening process is suitably carried out, therefore whether become not without the need for other perform detection shooting image Clearly process.Thus, the camera head 1 according to present embodiment, can carry out shooting image by simple process Sharpening.

In addition, the camera head 1 of present embodiment is constituted as follows：Such as the step of Fig. 7 shown in S105, when by user In the case of the input of setting instruction of default connection pattern has been accepted via input unit 25, image processing part 21 will be according to next The measured value (standard deviation) of the parameter acquired by signal from imaging apparatuss 14 is stored in storage part as reference value σ Ref 22.Therefore, user, can be based on clear by target area, clearly time point is input into the setting instruction for presetting connection pattern The standard deviation of shooting image be set as reference value σ Ref.Thereby, it is possible to successfully avoid when target area is unsharp Point is obtained and sets reference value.Thereby, it is possible to more reliably suppress to carry out automatic amendment in the indistinctness to shooting image In the case of misoperation.

In addition, in the camera head 1 of present embodiment, in reference value σ Ref of the setting based on measured value (standard deviation) Before, general reference value σ 0 is stored in into storage part 22 in advance.Then, such as the step of Fig. 7 shown in S105～S108, at image Reason portion 21 obtains the reference value σ Ref based on measured value and performs at sharpening in the case where default connection pattern is set Reason, in the case of default connection pattern is not set, performs sharpening process according to general reference value σ 0.Thus, for example It is the situation at cloudy day etc. when camera head 1 starts, as the clearly bat mutually suitable with the setting of reference value σ Ref cannot be obtained Take the photograph image and in the case of not setting default connection pattern, it is also possible to sharpening process is performed using general reference value σ 0.

In addition, in the camera head 1 of present embodiment, being configured to such as the step of Fig. 7 shown in S110～S114, according to reference The size of value switching to make the adjusted value (gamma value G1～G3) of shooting image sharpening, therefore, it is possible to pass through easy place The contrast of shooting image is successfully adjusted to reason the state for being suitable to sharpening.

Additionally, in the camera head 1 of present embodiment, as the parameter of the definition for representing shooting image, using from certainly Luminance standard deviations acquired by the signal of one image of the output of imaging apparatuss 14, therefore as illustrated with reference to Fig. 3 (a), (b) As, the indistinctness of shooting image can be grasped exactly.

＜ modifications ＞

In said embodiment, by adjusting the gamma value applied in gamma correction processing unit 103 carrying out shooting figure The sharpening of picture, but the sharpening process of shooting image is not limited to this.For example, carrying the sharpening to carry out sharpening Process in the camera head of engine, also shooting image can be carried out by adjusting the parameter value set in sharpening process engine Sharpening.

In addition, in said embodiment, two gamma value G1, G2 repairing for the low shooting image of definition are prepared The species of the gamma value for just, but for sharpening processing is not limited to this.For example, in the flow chart of figure 7, also can by with reference The threshold value that value compares is set as more than three, and the gamma value processed for sharpening is set as more than three.Consequently, it is possible to Can realize that more accurately sharpening is processed.Or also threshold value can be set to one, and gamma value is set to into one.

In addition, in said embodiment, reference value is set to into the ratio of reference value σ Ref and measured value (standard deviation), But reference value is not limited to this, as long as representing the value that measured value is differed with reference value, just can be arbitrary value.For example, Also the value deducted from reference value σ Ref obtained by measured value (standard deviation) can be used as reference value.

In addition, in said embodiment, as the parameter of the definition for representing shooting image, using brightness histogram Variance, but represent that the parameter of the definition of shooting image is not limited to this.In addition, representing the parameter of the definition of shooting image simultaneously It is nonessential to be limited to one kind, two or more parameters also can be combined to judge the definition of shooting image.

In addition, in said embodiment, the value (gamma for sharpening process is synchronously carried out with vertical synchronizing signal Value) renewal, but carry out the time point of the renewal and be not limited to this.For example, also can be every (for example, several seconds～number of specific time Ten seconds) renewal of value for sharpening process is carried out, or Changes in weather can detected according to date-time and illumination Time point carry out the renewal.

In addition, the module composition of camera head 1 is not limited to the composition shown in Fig. 1, but various changes can be carried out.Separately Outward, image processing part 21 also can be made up of hardware (circuit), or also can be by software sharing.In addition, camera head 1 is removed for clapping Take the photograph outside the monitoring camera of street or intersection, it may also be used for various uses.

Additionally, embodiments of the present invention suitably can be entered in the category of the technological thought shown in claims The various changes of row.

The explanation of symbol

1 camera head

10 image pickup parts

21 image processing parts

22 storage parts

Claims (6)

1. a kind of camera head, it is characterised in that possess：

Image pickup part, makes the light from target area be imaged in imaging apparatuss；

Image processing part, the signal to exporting from the imaging apparatuss are processed and image output information；And

Storage part, storage represent the reference value of the specific parameter of the definition of shooting image；

Described image processing unit obtains the measured value of the parameter according to the signal being input into from the imaging apparatuss, and will be in spy The measured value that fixed time point is obtained is stored in the storage part as the reference value, according to the measured value for obtaining afterwards with deposit The difference of the reference value in the storage part is stored up, the sharpening to shooting image is performed and is processed.

2. camera head according to claim 1, it is characterised in that：

Described image processing unit accept setting indicate input in the case of, by basis from the imaging apparatuss signal institute The measured value of the parameter for obtaining is stored in the storage part as the reference value.

3. camera head according to claim 1 and 2, it is characterised in that：

The storage part is dividually to prestore the 2nd reference value with the 1st reference value based on measured value,

Described image processing unit in the case of the pattern using based on the 1st reference value of measured value that sets, according to reality Measured value and obtain the 1st reference value and perform the sharpening and process, in the case where the pattern is not set, according to described 2nd reference value and perform the sharpening and process.

4. camera head according to any one of claim 1 to 3, it is characterised in that：

Described image processing unit switches to make shooting image sharpening with the difference of the reference value according to the measured value Adjusted value.

5. camera head according to claim 4, it is characterised in that：

The adjusted value is the value that gamma correction is carried out to the signal to exporting from the imaging apparatuss.

6. camera head according to any one of claim 1 to 5, it is characterised in that：

The parameter of the definition of expression shooting image is acquired by the signal from the image exported from the imaging apparatuss Brightness standard deviation.