TWI526070B - An aperture control system for an image pickup apparatus and a method thereof - Google Patents

Description

Optical aperture control system of camera device and method thereof

The invention relates to an aperture control system and a method thereof for an image pickup device, in particular to an image analysis capable of performing efficiency, and can treat an over-bright light source as noise and filter it, so that the iris lens (Iris Lens) can be It is placed in a position with better optical characteristics and has compensating effects such as strong light, front light or backlight, and is suitable for cameras, monitors, cameras or the like.

In recent years, the resolution of the optical lens (Lens) for recording images has become higher and higher, so in addition to the high resolution of the optical lens (Lens), the image quality is also required to be higher and higher, especially whether it is near When shooting or taking a long shot, you want your image to be clearly visible.

However, the currently used optical lens (Lens) has a fixed lens (Fix Lens), a manual lens (Manual Lens) or an automatic lens (Audio iris: DC irisor Video Iris), etc., for controlling the enlargement or reduction of the aperture. Different usage restrictions make it impossible to accurately control good image quality.

Therefore, in view of the above-mentioned deficiencies, the present inventors have been able to propose an aperture control system and method for an image pickup apparatus that accurately adjusts to an optimum state to perform image recording, thereby reducing the burden on the hardware and making the imaging apparatus run more smoothly. It is a research and design system to provide consumer use.

The main object of the present invention is to provide an aperture control system for a camera device and a method thereof, by performing image analysis on the static image, displaying the grayscale value in the image and cutting into a plurality of sub-blocks, and then sub-blocking The grayscale value is divided into a plurality of grayscale intervals, and then the total number of pixels (N1) of each grayscale interval in the subblock is counted, and then the average grayscale value of the subblock is calculated according to the image analysis step described above. The average grayscale value of the overall picture, and the over-bright light source is regarded as noise and filtered. When the brightness is judged, the control of the image processor (ISP) or the control adjustment of the motor drive circuit is performed through the control logic program. The iris lens (Iris Lens) can be stopped at a position with better optical characteristics, and can also be used in a low illumination or strong light environment to achieve an appropriate light filling effect, thereby increasing the overall practicality and superiority.

A second object of the present invention is to provide an aperture control system for a camera device and a method thereof, including an aperture lens (Iris Lens), a motor drive circuit, an image sensor, an image processor (ISP), and a The actuation controller is designed to connect the actuation controller to the image processor (ISP) and the motor drive circuit to obtain the optical information and the position of the motor in the iris lens (Iris Lens), and the actuation controller is provided The image analysis program and control logic program, through the control logic program for image processor (ISP) control adjustment and motor drive circuit control adjustment, the iris lens (Iris Lens) and image processor (ISP) can be precisely adjusted to The best condition for image recording, which increases overall operability and stability.

For the above purposes, the main steps of the aperture control system and method of the camera device of the present invention include: image recording: the aperture lens (Iris Len) s) is driven by a motor, and the motor is driven by a motor drive circuit, and the image is recorded by an iris lens (Iris Lens) and transmitted to the image sensor; an image is obtained: the image sensor is connected to An image processor (ISP), and an image processor (ISP) is connected to the actuation controller, and the actuation controller is provided with an image analysis program and a control logic program, and the image analysis program is from the image sensor. Take a static image; obtain image processor (ISP) information: and actuate the controller to obtain information in the image processor (ISP) in the image processor (ISP); obtain the information and position of the iris lens (Iris Lens): The actuating controller obtains the optical information of the iris lens (Iris Lens) and the position of the motor in the iris lens (Iris Lens); image analysis: when the static image is taken out from the image sensor, the static image is performed Image analysis, displaying the grayscale value before the image and cutting into a plurality of sub-blocks, then dividing the grayscale value of the sub-block into a plurality of gray-scale intervals, and then counting the total number of pixels of each gray-scale interval in the sub-block (N 1); determining the brightness of the image: according to the image analysis step described above, calculating the average gray level value of the sub-block minus the average gray level value of the overall picture; and the iris lens (Iris Lens) actuation: when determining the brightness of the image through the above When the light and dark steps determine the brightness and darkness, the image processor (ISP) control adjustment or the motor drive circuit control adjustment is performed through the control logic program, so that the iris lens (Iris Lens) and the image processor (ISP) can perform image capture. .

Other features and embodiments of the present invention will be further understood from the following detailed description taken in conjunction with the drawings.

10‧‧‧ aperture lens (Iris Lens)

20‧‧‧Motor drive circuit

30‧‧‧Image Sensor (Image Sensor)

40‧‧‧Image Processor (ISP)

50‧‧‧ actuation controller (controller)

51‧‧‧Image Analysis Program

52‧‧‧Control logic program

Step S100‧‧‧Video Recording

Step S110‧‧‧Get an image

Step S120‧‧‧Get Image Processor (ISP) Information

Step S130‧‧‧Get the iris lens (Iris Lens) information and location

Step S140‧‧‧ Image Analysis

Step S1411‧‧ Search for the brightest spot

Step S1412‧‧‧ judgment of critical value

Step S1421‧‧·Adding the grayscale value

Step S1422‧‧‧ Take the average brightness

Step S150‧‧‧Determination of image brightness

Step S151‧‧‧ Is the comparison greater than the critical value?

Step S152‧‧‧ Statistics

Step S153‧‧‧Determine whether it is an overexposed block

Step S160‧‧‧ aperture lens (Iris Lens) actuation

Figure 1 is a schematic flow chart of the main steps of the present invention.

Figure 2 is a schematic flow chart of the brightness step of the brightest point of the present invention.

Figure 3 is a flow chart showing the steps of the average brightness step of the present invention.

Figure 4 is a flow chart showing the steps of the present invention for determining whether it is an overexposed block.

Figure 5 is a schematic diagram of the architecture of the control system of the present invention.

Please refer to FIG. 1 to FIG. 5 , which are schematic diagrams and schematic diagrams of the method of the aperture control system and method of the camera device of the present invention. The main steps of the control method of the present invention include: step S100 video recording: the iris lens (Iris Lens) 10 is driven by a motor, and the motor is driven by the motor drive circuit 20, and the aperture lens (Iris Lens) 10 The image is recorded and transmitted to the image sensor 30; in step S110, an image is obtained: the image sensor 30 is connected to an image processor (ISP) 40, and the image processor (ISP) 40 is further coupled to the actuation controller. 50 is connected, and the motion controller 50 is provided with an image analysis program 51 and a control logic program 52, and the image analysis program 51 extracts a static image from the image sensor 30; and the image processor is obtained in step S120 ( ISP) information: the actuation controller 50 obtains information in the image processor (ISP) 40 in the image processor (ISP) 40; the step S130 acquires information and position of the aperture lens (Iris Lens): and the actuation controller 50 is in the aperture The optical information of the iris lens (Iris Lens) 10 and the position of the motor are obtained in the lens (Iris Lens) 10; Step S140 image analysis: after extracting a static image from the image sensor 30, the image is analyzed by the static image, and the grayscale value is displayed in the image and cut into a plurality of sub-blocks, and then the sub-block is The grayscale value of the block is divided into a plurality of grayscale intervals, and then the total number of pixels (N1) of each grayscale interval in the subblock is counted; in step S150, the brightness of the image is determined: according to the image analysis step of step S140 described above, the calculation is performed. The average grayscale value of the sub-block is subtracted from the average grayscale value of the overall picture; and the iris lens (Iris Lens) is activated in step S160: when it is determined through the above step S150 that the brightness of the image is determined to be bright or dark, that is, through the control logic program 52. The control adjustment of the image processor (ISP) 40 or the control adjustment of the motor drive circuit 20 allows the iris lens (Iris Lens) 10 and the image processor (ISP) 40 to perform image capture.

In addition, the control system of the present invention comprises: an aperture lens (Iris Lens) 10, which is driven by a motor; a motor drive circuit 20, which is connected to the aperture lens (Iris Lens) 10 a driving sensor; an image sensor 30 connected to the aperture lens 10 for recording images; an image processor (ISP) 40, the image processor (ISP) 40 and image sense The detector 30 is connected; and an actuation controller 50 is connected to the image processor (ISP) 40 and the motor drive circuit 20 to obtain the optical information and the motor in the aperture lens (Iris Lens) 10. Positioning, the actuation controller 50 is provided with an image analysis program 51 and a control logic program 52, and the control logic program 52 controls the adjustment of the image processor (ISP) 40 and the control of the motor drive circuit 20 to make the aperture Lens (Iris The Lens 10 and Image Processor (ISP) 40 can perform image capture.

The image analysis in the step S140 further includes the following steps: searching for the brightest point in step S1411: searching for the brightest point in the grayscale interval where the grayscale value is relatively small; and determining the critical value in step S1412: determining the pixel of the grayscale interval Whether the total number (N1) is greater than the critical value (Th1), when the total number of pixels (N1) is greater than the critical value (Th1), it is the brightest point. If the total number of pixels (N1) is less than the critical value (Th1), return to the previous step to search for the brightest point. Performing a re-search; in another step S140, the image analysis further includes the following steps: Step S1421 adds the grayscale value: the grayscale value of each pixel in the total image is X; and the average luminance in step S1422: The total grayscale value X is divided by the total number of pixels in the image to obtain an average brightness; and the step S150 determines that the brightness of the image further includes the following steps: whether the comparison in step S151 is greater than a critical value: the average grayscale value of the sub-block is reduced Go to the average grayscale value of the overall picture to determine whether it is greater than the critical value (Th2). If it is greater than the critical value (Th2), the sub-block is regarded as a noise block and is not considered; step S152 is performed: For less than the critical value (Th2), the total number of pixels (N2) whose grayscale value is greater than the critical value (Th3) in the sub-block is counted; and step S153 determines whether it is an overexposed block: when the total number of pixels (N2) is greater than The sub-block is an overexposed block when the threshold value is (Th4), and the sub-block is a non-overexposure block when the total number of pixels (N2) is less than the threshold (Th4); the actuation controller 50 is Further, through the control logic program 52, the automatic exposure (AE) and automatic gain control (AGC) limits of the automatic mode (AUTO Mode) of the image processor (ISP) 40 are adjusted, and it is confirmed whether the minimum limit (MIN V is reached). The state of the alue) or the maximum value (MAX Value), when in the limit value, its automatic mode (AUTO Mode) keeps the iris lens (Iris Lens) 10 at a predetermined position, and when the limit value is reached and can be adjusted, the automatic correction is performed. Automatic exposure (AE) and automatic gain control (AGC) of the mode (AUTO Mode) use range-related parameters; when the automatic mode (AUTO Mode) further reaches the limit value and cannot be adjusted, the automatic mode (AUTO Mode) is switched to Manual control mode to change the opening or closing state of the iris lens (Iris Lens) 10, and manually control the shutter time (Shutter Time) and gain value (Gain Value) to determine the motor moving speed and prevent the iris lens (Iris Lens) 10 Concussion.

Please refer to FIG. 1 to FIG. 5 , which are schematic diagrams and schematic diagrams of the method of the aperture control system and method of the camera device of the present invention. The best operating principle of the present invention is applied to an iris lens (Iris Lens) 10 using a motor, which can accurately control the aperture size by means of a program, so as to be able to stop at a position where the image quality is better, and can be adapted to the ambient light source. The change is appropriately performed to enlarge or reduce the iris lens (Iris Lens) 10, and statistical analysis of the image data is used to optimize the light source compensation mechanism; therefore, the aperture control system of the present invention (as shown in FIG. 5) includes a diaphragm lens (Iris Lens) 10, a motor drive circuit 20, an image sensor 30, and an image processor (ISP) 40, an actuation controller 50, wherein the iris lens (Iris Lens) 10 is a motor Driving, and the motor is a stepper, DC motor or other power-driven motor, and the iris lens (Iris Lens) 10 is connected to the motor drive circuit 20 to drive the motor to operate, The motor drive circuit 20 is provided with a control IC for precise fine-tuning, or other motor drive plus other originals for confirming the aperture position, such as a DC motor added to an optical scale or an encoder, etc. The iris lens (Iris Lens) 10 is also connected to an Image Sensor 30 (such as a CCDSensor or CMOS Sensor) to record images, and the Image Sensor 30 is based on an aperture lens (Iris Lens). The brightness of the image transmitted from 10 is converted into a digital voltage signal of the image sensor 30 (ie, the optical signal is converted into an electrical signal), and the image sensor is connected to the image processor (ISP) 40. The image processor (ISP) 40 can also be designed with the image sensor 30 or with the actuation controller 50 to restore the image to the scene details under different optical conditions. The main functions of the image processor (ISP) 40 are automatic white balance (AWB), automatic exposure (AE) and auto focus (AF), in order to adjust the size of the iris lens (Iris Lens) 10 and change the amount of light incident, and image sensing Shutter Time and Shadow of the Device 30 The image processor (ISP) 40 and the gain value (Gain Value) can also be adjusted. Furthermore, the image processor (ISP) 40 and the motor drive circuit 20 are connected to an actuation controller 50 to obtain the aperture. The optical information and the position of the motor in the lens (Iris Lens) 10, and the image analysis program 51 and the control logic program 52 are provided in the actuation controller 50, so that the image analysis program 51 can display the image sensor (Image Sensor) The image of 30 is used for image analysis, wherein the image analysis is to obtain the information of the brightness, average brightness and brightness block distribution of the brightest point, and obtain image processor (ISP) 40 information and obtain light according to the above image analysis. Iris Lens 10 information and position to comprehensively determine the brightness of the image, and the over-bright light source as noise to filter out, when the brightness is judged by the above-mentioned judgment of the brightness of the image, that is, through the control logic program 52 Perform control adjustment of the image processor (ISP) 40 or control adjustment of the motor drive circuit 20, so that the iris lens (Iris Lens) 10 and the image processor (ISP) 40 can be accurately adjusted to the optimal state for image recording, wherein The actuation controller 50 further adjusts the automatic exposure (AE) and automatic gain control (AGC) limits of the automatic mode (AUTO Mode) of the image processor (ISP) 40 through the control logic program 52, and confirms whether the minimum limit is reached. (MIN Value) or the maximum value (MAX Value), when in the limit value, its automatic mode (AUTO Mode) keeps the iris lens (Iris Lens) 10 at a predetermined position, and when the limit value is reached and can be adjusted Correct the automatic exposure (AE) and automatic gain control (AGC) of the automatic mode to use the range-related parameters to make the image brightness appropriate, and the automatic mode (AUTO Mode) further reaches the limit and no When adjusting, the automatic mode (AUTO Mode) is switched to the manual control mode to change the opening or closing state of the iris lens (Iris Lens) 10, and manually control the shutter time (Shutter Time) and the gain value (Gain Value) to determine The motor moves at a speed and prevents the iris lens (Iris Lens) from oscillating.

In addition, the aperture control method of the camera device of the present invention (as shown in FIG. 1) can perform image analysis efficiently, and simultaneously perform image processing such as noise removal to achieve compensation effects such as strong light, front light, and backlight. Perform step S100 video recording: The Iris Lens 10 series is driven by a motor, and the motor is driven by a motor drive circuit, and the image is recorded by an iris lens (Iris Lens) 10 and transmitted to the image sensor 30; wherein the image sensing The image sensor 30 can be converted into a digital voltage signal of the image sensor 30 (ie, the optical signal is converted into an electrical signal) according to the brightness of the image transmitted from the iris lens (Iris Lens) 10. Step S100: After the video recording, the next step is performed.

The next step is to obtain an image for step S110: the image sensor (Image Sensor) 30 is connected to the image processor (ISP) 40, and the image processor (ISP) 40 is connected to the controller 50. The image controller 51 and the control logic program 52 are provided in the controller 50, and the image analysis program 51 extracts a static image from the image sensor 30, thereby allowing image analysis. The program 51 can start the subsequent analysis process, and completes the step S110 to obtain an image and then proceeds to the next step.

The next step is to obtain image processor (ISP) information for the step S120: the actuation controller 50 obtains information in the image processor (ISP) 40 in the image processor (ISP) 40; thereby, the images are made different. The optical details restore the scene details of the recording. The main functions of the image processor (ISP) 40 are automatic white balance (AWB), automatic exposure (AE) and auto focus (AF), which enables the aperture lens (Iris Lens). ) 10 Shutter Time adjustment, can also provide the aperture lens when the still image is recorded during the analysis process (Iris The size of the Lens) 10, the shutter time of the image sensor (Shutter Time), and the value of the image processor (ISP) gain value (Gain Value) are used for judging, and after completing the step S120 to obtain the image processor (ISP) information, Go to the next step.

The next step is to obtain the iris lens (Iris Lens) information and position in the step S130: the actuation controller 50 obtains the optical information of the iris lens (Iris Lens) and the position of the motor in the iris lens (Iris Lens) 10; It can provide the relative relationship between the optical information such as the modulation conversion function (MTF) and depth of field (DOF) of the iris lens (Iris Lens) 10 and the position of the current motor when the still image is recorded during the analysis process. The position of the aperture target expected by the user and the brightness value expected by the user are used to provide the judgment, and the step S130 is performed to obtain the information and position of the iris lens (Iris Lens) and then proceed to the next step.

The next step is the image analysis in step S140: after extracting a still image from the image sensor 30, the image is analyzed for the still image, and the grayscale value is displayed in the image and cut into a plurality of sub-regions. Block, then divide the gray scale value of the sub-block into a plurality of gray-scale intervals, and then count the total number of pixels (N1) of each gray-scale interval in the sub-block; thereby, the image analysis in this step S140 mainly uses the variance number The concept, that is, the dispersal of information in a group is a statistic, that is, an indicator used to indicate the size of an individual difference. In short, if the value of a single element differs from the overall average, the probability of being a noise is higher. Therefore, in step S140, the image analysis uses an algorithm that can treat the over-bright light source as noise and filter it, and captures the Y value before the image to display the gray-scale value, and cuts into a complex number. Sub-block, then divide the gray-scale value of the sub-block into a plurality of gray-scale intervals, and then count each gray-scale in the sub-block The total number of pixels in the interval (N1), wherein the image analysis in step S140 (as shown in FIG. 2) includes the following steps to obtain the brightness information of the brightest point, first performing step S1411 to search for the brightest point: comparing the gray level to the gray level Searching for the brightest point in the interval; and determining the threshold value in step S1412: determining whether the total number of pixels (N1) of the gray interval is greater than a threshold (Th1), and when the total number of pixels (N1) is greater than a threshold (Th1) If the total number of pixels (N1) is less than the threshold (Th1), return to the previous step S1411 to search for the brightest point for re-search; in addition, the step S140 includes the following steps in the image analysis (as shown in FIG. 3), and the first step is performed. S1421 adds the grayscale value: the grayscale value of each pixel in the total image is X; and the average luminance in step S1422: dividing the total grayscale value X by the total number of pixels in the image to obtain an average brightness; After the image analysis result of step S140 is completed, the next step is performed.

The next step is to determine the brightness of the image in the step S150: calculating the average gray level value of the sub-block minus the average gray level value of the overall picture according to the image analyzing step of step S140 described above; thereby capturing in the image The Y value is used to display the gray scale value, and is cut into a plurality of sub-blocks, and the average gray scale value of the sub-block is calculated by subtracting the overall picture average gray-scale value, wherein the step S150 determines that the brightness and the brightness further contain the following Step (as shown in FIG. 4), whether the comparison in step S151 is greater than a critical value: the average grayscale value of the sub-block minus the overall grayscale value of the overall image to determine whether it is greater than a critical value (Th2), if greater than a critical value (Th2), the sub-block is regarded as a noise block and is not considered; and then step S152 is performed for statistics: if the comparison is smaller than the threshold (Th2), the gray-scale value in the sub-block is statistically greater than the critical value. The total number of pixels of the value (Th3) (N2); and the step S153 determine whether it is an overexposed block: when the total number of pixels (N2) is greater than When the threshold value (Th4) is used, the sub-block is an over-exposed block, and when the total number of pixels (N2) is less than the critical value (Th4), the sub-block is a non-overexposed block; The sub-block is considered as a noise block, and the remaining sub-blocks are judged to be over-exposed blocks or non-overexposed blocks to enable subsequent adjustment operations.

When it is determined that the brightness of the image is not appropriate, the automatic exposure (AE) and automatic gain control (AGC) limits of the automatic mode (AUTO Mode) of the image processor (ISP) 40 are adjusted by the control logic program 51 of the actuation controller 50. And confirm whether the state of the minimum limit (MIN Value) or the maximum limit (MAX Value) is reached, and when it is within the limit value, its automatic mode (AUTO Mode) keeps the iris lens (Iris Lens) 10 at a predetermined position and reaches the limit. The value can be adjusted to correct the automatic exposure (AE) and automatic gain control (AGC) range parameters of the automatic mode (AUC mode) to make the image brightness appropriate; and the automatic mode (AUTO Mode) further reaches the limit. When the value cannot be adjusted, the AUTO mode is switched to the manual control mode to change the opening or closing state of the iris lens (Iris Lens) 10, and manually control the shutter time (Shutter Time) and the gain value (Gain Value). ) to determine the motor movement speed and prevent the iris lens (Iris Lens) 10 oscillator, therefore, regardless of the image brightness is over-exposed, too bright or too dark, can be through the controller 50 Moving the video processor (ISP) 40 for a shutter time (Shutter Time) and the gain (Gain Value) adjustment, or the motor driving circuit 20 to start the motor speed of the speed The adjustment allows the iris lens (Iris Lens) 10 to be accurately adjusted to the best condition for video recording.

As apparent from the above, the aperture control system and method of the image pickup apparatus of the present invention have the following advantages:

1. It can accurately control the iris lens (Iris Lens) to zoom in or out to stop at the better image quality.

2. With the change of the ambient light source, the iris lens (Iris Lens) can be adjusted to zoom in or out at the right time.

3. Through the statistical analysis of image data, enable the optimization of the light source compensation mechanism.

From the above detailed description, those skilled in the art can understand that the present invention can achieve the foregoing objects, and has met the requirements of the patent law and filed a patent application.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made by the scope of the present invention and the contents of the specification, All should remain within the scope of the invention patent.

Step S100‧‧‧Video Recording

Step S110‧‧‧Get an image

Step S120‧‧‧Get Image Processor (ISP) Information

Step S130‧‧‧Get the iris lens (Iris Lens) information and location

Step S140‧‧‧ Image Analysis

Step S150‧‧‧Determination of image brightness

Step S160‧‧‧ aperture lens (Iris Lens) actuation

Claims (6)

The aperture control method of the camera device, the main steps of the control method include: image recording: the iris lens (Iris Lens) is driven by a motor, and the motor is driven by a motor drive circuit, and the aperture lens (Iris Lens) Recording images and transmitting them to the image sensor; obtaining an image: the image sensor is connected to an image processor (ISP), and the image processor (ISP) is connected to the actuation controller, and the actuation control The image analysis program and the control logic program are provided in the device, and the image analysis program extracts a static image from the image sensor; obtains image processor (ISP) information: and acts on the image processor (ISP) Get the information in the image processor (ISP); get the information and position of the iris lens (Iris Lens): and actuate the controller to obtain the optical information of the iris lens (Iris Lens) and the position of the motor in the iris lens (Iris Lens) Image analysis: When a static image is taken out from the image sensor, the image is analyzed for the still image, and the grayscale value is displayed before the image and cut into a plurality of images. Block, then divide the grayscale value of the sub-block into a plurality of gray-scale intervals, and then count the total number of pixels (N1) of each gray-scale interval in the sub-block; determine the brightness of the image: according to the image analysis step described above The average grayscale value of the sub-block is subtracted from the average grayscale value of the overall picture; and the iris lens (Iris Lens) is activated: when the brightness is determined through the above-mentioned determination of the brightness of the image brightness, the image is transmitted through the control logic program. Control adjustment of the ISP (ISP) or control adjustment of the motor drive circuit allows the iris lens (Iris Lens) and image processor (ISP) to perform image capture. The aperture control method of the camera device according to claim 1, wherein the image analysis step further comprises the steps of: searching for the brightest point: searching for the brightest point in the grayscale interval with a smaller grayscale value; and performing the criticality Judging the value: determining whether the total number of pixels (N1) of the gray-scale interval is greater than a critical value (Th1), and the brightest point when the total number of pixels (N1) is greater than a critical value (Th1), if the total number of pixels (N1) is less than a critical value (Th1) Go back to the previous step and search for the brightest spot to re-search. The aperture control method of the camera device according to the first aspect of the invention, wherein the image analysis step further comprises the following steps: adding a grayscale value: adding a grayscale value of each pixel in the image to X; And the average brightness is obtained by dividing the total grayscale value X by the total number of pixels in the image to obtain the average brightness. The aperture control method of the camera device according to claim 1, wherein the step of determining the brightness of the image further comprises the step of: comparing whether the comparison is greater than a critical value: an average grayscale value of the sub-block minus the whole The average grayscale value of the picture is used to determine whether it is greater than the critical value (Th2). If it is greater than the critical value (Th2), the sub-block is regarded as a noise block and is not considered; statistics are performed: if the comparison is smaller than the critical value (Th2) And counting the total number of pixels (N2) whose grayscale value is greater than the critical value (Th3) in the sub-block; and determining whether it is an overexposed block: when the total number of pixels (N2) is greater than a critical value (Th4) The block is an overexposed block, and when the total number of pixels (N2) is less than the threshold (Th4), the sub-block is a non-overexposed block. The aperture control method of the camera device according to the first aspect of the invention, wherein the actuation controller further adjusts an automatic exposure (AE) of an automatic mode (AUTO Mode) of an image processor (ISP) through a control logic program. The automatic gain control (AGC) limit value and confirm whether the state of the minimum limit (MIN Value) or the maximum limit (MAX Value) is reached. When it is within the limit value, its automatic mode (AUTO Mode) holds the iris lens (Iris Lens). In the predetermined position, when the limit value is reached and the adjustment can be made, the automatic exposure (AE) and automatic gain control (AGC) use range related parameters of the automatic mode (AUTO Mode) are corrected. The aperture control method of the camera device according to claim 5, wherein the automatic mode (AUTO Mode) further reaches the limit value and cannot be adjusted, that is, the automatic mode (AUTO Mode) is switched to the manual control mode to enable Change the opening or closing state of the iris lens (Iris Lens) and manually control the Shutter Time and Gain Value to determine the motor movement speed and prevent the iris lens (Iris Lens) from oscillating.