WO2017114252A1 - Static image collection method and device - Google Patents

Abstract

Disclosed in embodiments of the present invention are a static image collection method and device, which are applied to scanning-based imaging devices. The method comprises: obtaining a scanning cycle T₀ of a scanning-based imaging device that scans a frame of scanning image and an exposure time T_exp of an image collection unit; determining the quantity N of cycles needed to collect a complete image according to a value relationship between the scanning cycle T₀ and the exposure time T_exp; invoking an image collection unit to collect images according to a preset image collection rule; and merging the collected N images to obtain a complete image of the image scanned by the scanning-based imaging device. When image collection is performed by using the solution provided in the embodiments of the present invention, it is easy to collect a complete image of an image scanned by a scanning-based imaging device.

Description

Method and device for collecting static images

The present application claims priority to Chinese Patent Application No. 201511031778.X, filed on Dec. 31, 2015, entitled "A Method and Apparatus for Collecting Still Images", the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of image processing technologies, and in particular, to a method and an apparatus for acquiring a static image.

Background technique

With the rapid development of electronic technology, scanning imaging equipment is also widely available, and it is widely used by more and more people because of its wide use. Currently, scanning imaging equipment has been widely used in business office, video teaching, home theater. , cinema, etc. Scanning imaging devices can be divided into various categories from different angles, for example, scanning imaging devices can be classified into laser scanning imaging devices, infrared scanning imaging devices, electronic scanning imaging devices, and the like according to scanning sources.

In practical applications, the user may need to perform image acquisition on the scanned image of the scanning imaging device. However, the scanned image of the scanning imaging device is scanned by the scanning imaging device in a scanning cycle by point-by-point scanning, and Generally, the exposure time of the image capturing device is less than the above-mentioned scanning period. Therefore, the scanning imaging device can only scan a part of the completed image during the above exposure time, and the image capturing device is difficult to collect when acquiring the scanned image of the scanning imaging device. To the full image.

Summary of the invention

The embodiment of the invention discloses a method and a device for acquiring a static image, so as to easily collect a complete image of the scanned image of the scanning imaging device.

In order to achieve the above objective, an embodiment of the present invention discloses a method for collecting a static image, including the steps of:

Obtaining a scan period T _{0 of} scanning a frame scan image by the scanning imaging device and an exposure time T _{exp of the} image acquisition unit;

Determining, according to the numerical relationship between the scanning period T ₀ and the exposure time T _exp , the number of scanning cycles N required to acquire a complete image;

Calling the image acquisition unit to acquire an image according to a preset image acquisition rule, wherein the image acquisition unit collects only one image in each scan period of the N scan periods of the scan imaging device, the preset The image acquisition rule is used to specify an image acquisition triggering time of the image capturing unit in each scanning period to ensure that the collected N images contain all the contents of one scanned image of the scanning imaging device;

Image synthesis is performed on the acquired N images to obtain a complete image of the scanned image for the scanning imaging device.

Preferably, according to the numerical relationship between the scanning period T ₀ and the exposure time T _exp , determining the number N of scanning cycles required to acquire a complete image includes:

According to the scanning period T ₀ and the exposure time T _exp , according to the following relationship,

T ₀ /N ≤ T _exp <T ₀ /(N-1),

The number of scan cycles required to acquire a complete image is N.

Preferably, the calling image acquisition unit collects images according to a preset image collection rule, including:

Triggering the image acquisition unit to acquire an image according to a preset image collection rule by transmitting an electrical signal; or

The image acquisition unit is triggered to transmit an image according to a preset image acquisition rule by transmitting an optical LED blinking manner.

Preferably, the calling image acquisition unit collects images according to a preset image collection rule, including:

Determining, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

Obtaining a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time;

When the earliest image acquisition triggering moment is reached in the determined image acquisition triggering time, the image acquisition unit is called to perform image acquisition, and the obtained time interval is sent to the image acquisition unit, so that the image acquisition unit follows the above The acquired time interval is used for image acquisition.

Preferably, the calling image acquisition unit collects images according to a preset image collection rule, including:

Determining, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

The image acquisition unit is called to perform image acquisition when the determined image acquisition trigger time is reached.

Preferably, the image is synthesized by using the acquired N images to obtain a complete image of the scanned image of the scanning imaging device, including:

Determining the area of the scanned content in the collected N images;

According to the determined position of the region where the scanning content is located in the image, image synthesis is performed on the acquired N images to obtain a complete image of the scanned image for the scanning imaging device.

In order to achieve the above object, an embodiment of the present invention discloses an apparatus for collecting a static image, including:

a hardware parameter obtaining module, configured to obtain a scan period T _{0 of} scanning a frame scan image by the scan imaging device and an exposure time T _{exp of the} image acquisition unit;

a scan cycle number determining module, configured to determine, according to the numerical relationship between the scan cycle T ₀ and the exposure time T _exp , the number of scan cycles N required to acquire a complete image;

An image acquisition module, configured to invoke an image acquisition unit to acquire an image according to a preset image acquisition rule, wherein the image acquisition unit collects only one image in each scan cycle of the N scan cycles of the scan imaging device The preset image acquisition rule is used to specify an image acquisition triggering time of the image capturing unit in each scanning period to ensure that the collected N images comprise a scanned image of the scanning imaging device. All content;

An image synthesizing module is configured to perform image synthesis on the acquired N images to obtain a complete image of the scanned image of the scanning imaging device.

Preferably, the scanning cycle number determining module is specifically configured to:

According to the scanning period T ₀ and the exposure time T _exp , according to the following relationship,

_{T 0 / N≤T exp <T 0} / (N-1),

The number of scan cycles required to acquire a complete image is N.

Preferably, the image acquisition module is specifically configured to:

Triggering the image acquisition unit to acquire an image according to a preset image collection rule by transmitting an electrical signal; or

The image acquisition unit is triggered to transmit an image according to a preset image acquisition rule by transmitting an optical LED blinking manner.

Preferably, the image acquisition module includes:

a first triggering time determining sub-module, configured to determine, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

Obtaining a sub-module for obtaining a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time;

a first image collection sub-module, configured to call an image acquisition unit to perform image acquisition when the earliest image acquisition trigger time is reached in the determined image acquisition trigger time, and send the obtained time interval to the image acquisition unit, The image acquisition unit is caused to perform image acquisition in accordance with the time interval obtained as described above.

Preferably, the image acquisition module includes:

a second triggering time determining sub-module, configured to determine, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

The second image collection sub-module is configured to invoke the image acquisition unit to perform image acquisition when the determined image acquisition trigger time is reached.

Preferably, the image synthesizing module comprises:

a region determining sub-module, configured to determine an area of the scanned content in the collected N images;

The image synthesizing sub-module is configured to perform image synthesizing on the collected N images according to the determined position of the region where the scanning content is located in the image, to obtain a complete image of the scanned image for the scanning imaging device.

In the solution provided by the embodiment of the present invention, the scan imaging device obtains the scan period T _{0 of} scanning a frame scan image and the exposure time T _exp of the image acquisition unit, according to the scan period T ₀ and the exposure time T The numerical relationship between _exp determines the number of scan cycles N required to acquire a complete image, and then calls the image acquisition unit to acquire N images according to preset image acquisition rules, and performs image synthesis on the acquired N images. A complete image of the scanned image for the scanning imaging device is obtained. Although only a part of the scanned image of the above-mentioned scanning imaging device can be acquired in one exposure period of the image capturing unit, in the solution provided by the embodiment of the present invention, image capturing is performed in multiple scanning periods of the scanning imaging device. In this way, it is ensured that the respective parts of the scanned image can be acquired, and therefore, a complete image of the scanned image of the scanning imaging apparatus can be easily acquired by means of image synthesis.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a schematic flowchart diagram of a method for collecting a static image according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart diagram of another method for collecting a static image according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart diagram of another method for collecting a static image according to an embodiment of the present invention.

FIG. 4(a) is a schematic diagram of a pulse according to an embodiment of the present invention.

FIG. 4(b) is a schematic diagram of another pulse according to an embodiment of the present invention.

FIG. 5 is a schematic flowchart diagram of another method for collecting a static image according to an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of an apparatus for collecting a static image according to an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts, All fall within the scope of protection of the present invention.

The embodiment of the invention provides a method and a device for acquiring a static image, which are applied to a scanning imaging device. Specifically, when the scanning imaging device acquires a static image, obtaining a scanning period in which the scanning imaging device scans one frame of the scanned image T ₀ and the exposure time T _{exp of the} image acquisition unit, according to the numerical relationship between the scan period T ₀ and the exposure time T _exp , determine the number of scan cycles N required to acquire a complete image, and call the image acquisition unit to follow Acquiring an image by a preset image acquisition rule, wherein the image acquisition unit collects only one image in each scan cycle of the N scan periods of the scan imaging device, and the preset image acquisition rule is used for Determining an image acquisition triggering time of the image capturing unit in each scanning period to ensure that the collected N images contain all the contents of one scanned image of the scanning imaging device, and performing N images acquired Image synthesis yields a complete image of the scanned image for the scanning imaging device.

The invention will now be described in detail by way of specific examples.

FIG. 1 is a schematic flowchart of a method for collecting a static image according to an embodiment of the present invention, including the following steps:

S1: Obtain a scanning period T ₀ in which the scanning imaging apparatus scans one frame of the scanned image and an exposure time T _{exp of the} image capturing unit.

It is not difficult to understand that the scanning imaging device may be a laser scanning imaging device, an infrared scanning imaging device, an electronic scanning imaging device, or a laser-based MEMS (Micro-Electro-Mechanical System) space. Scanning projection apparatus and the like, the present invention does not further define a scanning imaging apparatus.

It will be understood by those skilled in the art that the scanning period T ₀ of the scanning imaging apparatus for scanning a frame of scanned image is generally determined by the hardware parameters of the scanning imaging apparatus, such as the refresh rate of the scanned image and the resolution of the projected image. Wait.

The exposure time T _exp of the image acquisition unit is generally determined by the ambient light of the image acquisition unit and the hardware parameters of the image acquisition unit, wherein the ambient light is the ambient light of the application scene in which the image acquisition unit is located, in the image acquisition unit. The relevant information of the ambient light can be obtained by the photosensitive sensor and converted into an electrical signal, and the image acquisition unit adjusts the exposure time according to the electrical signal; the hardware parameters of the image acquisition unit can be the shutter speed, the photosensitivity of the photosensitive sensor, etc. This application does not limit the specific form of the hardware parameters of the image acquisition unit.

S2: Determine the number N of scanning cycles required to acquire a complete image according to the numerical relationship between the scanning period T ₀ and the exposure time T _exp .

In a specific implementation manner of the present application, according to the scanning period T ₀ and the exposure time T _exp , according to the following relationship,

_{T 0 / N≤T exp <T 0} / (N-1),

The number of scan cycles required to acquire a complete image is N.

It is worth emphasizing that the number N of scanning cycles determined by the above relationship is a positive integer. For example, the scan period T ₀ is 0.5 seconds, the exposure time T _exp 0.3 second, since the 0.5 / 2 <0.3 <0.5, so in this case the above-described relational expression N = 2, i.e., the determined scanning period The number is 2. For another example, the scanning period T ₀ is 0.8 seconds, and the exposure time T _exp is 0.3 seconds. Since 0.8/3<0.3<0.8/2, in this case, N=3 in the above relationship, that is, determined. The number of scan cycles is three.

S3: The image acquisition unit is called to acquire an image according to a preset image collection rule.

The image acquisition unit collects only one image in each scan period of the N scan periods of the scan imaging device, and the preset image acquisition rule is used to specify the image acquisition unit in each The image acquisition trigger time during the scan period ensures that the acquired N images contain all of the contents of one scanned image of the scanned imaging device.

Specifically, the image capturing unit may be a camera, a camera, a camera, etc., and the present application does not limit the specific expression of the image collecting unit.

It can be understood that the image acquisition unit may be part of the above-described scanning imaging device. In this case, the connection between the image acquisition unit and the main control unit of the scanning imaging device or the like can be realized by wire. In view of this, in a specific implementation of the present application, the scanning imaging device can trigger the call of the image acquisition unit by transmitting an electrical signal. The specific implementation process is that a data line is first connected between the image capturing unit and the scanning imaging device, and then the scanning state of the scanning imaging device is indicated by the data signal corresponding to the data line. Specifically, the data line corresponds to The data signal can be configured by a register inside the scanning imaging device. When the image acquisition triggering time of each scanning period of the scanning imaging device comes, the image collecting unit performs image acquisition, in the N scanning periods of the scanning imaging device. Only one image is acquired during each scan period to ensure that the acquired N images contain all of the contents of one scanned image of the scanning imaging device.

Of course, the image acquisition unit may not be part of the above-described scanning imaging device, but an external device connected to the scanning imaging device via a wireless local area network, Bluetooth or the like. Specifically, when the image capturing unit is not on the scanning imaging device, the scanning imaging device can trigger the calling of the camera by sending an optical LED to blink, and the specific implementation process is: first, between the image capturing unit and the scanning imaging device. The way to connect establishes a communication connection. There are many forms of wireless connection, such as: Bluetooth pairing connection, IoT connection, Wifi wireless signal connection, and so on. The scanning imaging device uses the LED light as a driving signal. When the image capturing triggering time of each scanning period of the scanning imaging device comes, the LED light is turned on, and the image capturing unit recognizes the driving signal and starts the camera, in the scanning mode. Only one image is acquired in each of the N scanning periods of the imaging device to ensure that the acquired N images contain all the contents of one scanned image of the scanning imaging device, and of course, can be used as a driving signal. There are many carriers, such as laser, sound, infrared, etc., which are not limited in this application.

S4: Perform image synthesis on the acquired N images to obtain a complete image of the scanned image for the scanning imaging device.

Specifically, image synthesis is performed on a total of N images acquired by the image acquisition unit in each scan period of the N scanning periods of the scanning imaging device in S3, to obtain a complete image of the scanned image for the scanning imaging device. image.

It can be seen from the above that, in the solution provided by the embodiment, the scanning imaging device obtains the scan period T _{0 of} scanning a frame scan image and the exposure time T _exp of the image acquisition unit, according to the scan period T ₀ and The numerical relationship between the exposure times T _exp determines the number of scan cycles N required to acquire a complete image, and then calls the image acquisition unit to acquire N images according to preset image acquisition rules, and performs N images acquired. Image synthesis, which in turn results in a complete image of the scanned image for the scanning imaging device. Although only a part of the scanned image of the above-mentioned scanning imaging device can be acquired in one exposure period of the image capturing unit, in the solution provided by the embodiment of the present invention, image capturing is performed in multiple scanning periods of the scanning imaging device. In this way, it is ensured that the respective parts of the scanned image can be acquired, and therefore, a complete image of the scanned image of the scanning imaging apparatus can be easily acquired by means of image synthesis.

It can be understood by those skilled in the art that after S2 calculates the number of scan cycles, the image acquisition unit can actively perform image acquisition when determining the image acquisition time of each cycle, or can be determined by the scanning imaging device. At the time of the image acquisition time of the cycle, the image acquisition unit is called to transmit the image by transmitting the call signal. The above two methods are respectively described by using two embodiments of FIG. 2 and FIG. 3.

FIG. 2 is a schematic flowchart of another method for collecting a static image according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 1 , in this embodiment, the image capturing unit is called to collect an image according to a preset image capturing rule ( S3), including:

S31: Determine an image acquisition triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device according to a preset image capturing rule.

Since the image acquisition unit can only capture a part of the scanned image in one scan period, in order to ensure that the complete scan image can be obtained by applying the solution provided by the embodiment of the present invention, each scan of the determined N scan cycles is determined. The image acquisition trigger time corresponding to the period needs to ensure that the images acquired in N cycles can contain each part of a complete image.

It can be understood by those skilled in the art that the image acquisition unit needs a certain delay after determining that the image acquisition triggering time is reached, and when the image acquisition is actually started, the delay is determined by hardware factors such as an image acquisition unit. In view of this, the above-described delay information can be considered together when determining the image acquisition trigger timing for each scanning period.

For example: scanning period assuming a scanning type image forming apparatus scans a scanned image T ₀ of 0.8 second, the exposure time of the image acquisition unit T _exp 0.3 second, S2 of the number may be determined scanning period 3, the calculation can be obtained, it is necessary to start The 3 image acquisition units complete 3 exposures to obtain 3 images, and only 1 exposure image is taken in each scanning cycle to obtain 1 image. If it is required to be 1/3 of the second scanning period, the image acquisition unit performs an image. When the image acquisition unit performs image acquisition at 2/3 around the third scan, it can be determined that the image acquisition trigger time corresponding to the second scan period is: the time corresponding to the 1/3 position of the second scan period - The above delay may determine that the image acquisition triggering time corresponding to the third scanning period is: the time corresponding to the 1/3 position of the third scanning period - the above delay. In this example, the calculation method of the image acquisition departure time corresponding to the first scanning period is not limited, and specifically, the calculation may be performed according to other methods.

S32: Obtain a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time.

Specifically, the scanning imaging device performs a difference between the adjacent image sampling triggering times determined in S31, and obtains a time interval between two adjacent image capturing triggering moments in the image capturing triggering time.

S33: When reaching the earliest image acquisition triggering moment in the determined image acquisition triggering moment, calling the image acquisition unit to perform image acquisition, and transmitting the obtained time interval to the image acquisition unit, so that the image acquisition unit Image acquisition was performed at the time intervals obtained above.

It should be noted that, in this embodiment, the image acquisition unit needs to have a timing function.

In the actual application, after the time interval between two adjacent image acquisition triggering moments in the image acquisition triggering time obtained in S32 is transmitted to the image acquisition unit, when the image acquisition unit is in the first scanning period of the scanning imaging device When the corresponding image acquisition trigger time comes, the scanning imaging device calls the image acquisition unit to start the camera exposure photographing, and while the start command is executed, the scan imaging device transmits the first time interval to the image acquisition unit, and the image acquisition unit When the timing is started, when the image acquisition unit counts the time interval between the first image acquisition and the second image acquisition, the image acquisition unit starts the second image acquisition, restarts the timing from zero, and then proceeds accordingly. Subsequent image acquisition, obtaining N images.

It can be seen from the above that in the embodiment, after the scan imaging device calculates the time interval between the two image acquisition triggering moments, the time interval data is sent to the image acquisition unit, and the image acquisition unit controls the image collection. By obtaining N images, the working pressure of the scanning imaging device during image acquisition can be effectively alleviated.

FIG. 3 is a schematic flowchart of another method for collecting a static image according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 1 , in this embodiment, the image capturing unit is called to collect an image according to a preset image capturing rule ( S3), including:

S34: Determine an image acquisition triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device according to a preset image capturing rule.

It will be understood by those skilled in the art that the signal transmission between the hardware units requires transmission time. In addition, due to the characteristics of the hardware, the image acquisition unit usually has a certain startup delay after receiving the trigger signal and before starting to acquire the image. Therefore, when determining the image acquisition triggering time corresponding to each scanning period in the N scanning periods of the scanning imaging apparatus, the overall delay composed of the above information of the transmission time and the startup delay should be considered. Specifically, the overall delay is generally determined by factors such as the scanning period T ₀ of the scanning imaging device and the exposure time T _exp of the image capturing unit and the environment in which the image capturing unit is located. Further, it is assumed that, in an ideal state, if the image acquisition unit is to perform image acquisition at time Tn, to ensure that the image acquisition unit can start collecting images at time Tn, it can be determined that the image acquisition trigger time corresponding to time Tn is Tn-the overall time. Delay.

S35: When the determined image acquisition triggering time is reached, the image acquisition unit is called to perform image acquisition.

In this embodiment, the scan imaging device does not need to transmit the image acquisition trigger time corresponding to each scan cycle in the N scan cycles obtained in S34 to the image acquisition unit, but monitors each image acquisition determined to reach S34. At the triggering time, the scanning imaging device calls the image acquisition unit, activates the camera, and collects the corresponding image.

It is known from the foregoing description that the image acquisition unit may be integrated with the scanning imaging device, or may not be integrated with the scanning imaging device. Specifically, in the case where the image acquisition unit is integrated with the scanning imaging device, the device may be The image acquisition unit is started to acquire an image by transmitting a signal through the data line; in the case that the image acquisition unit is not integrated with the scanning imaging device, the device can start the image acquisition unit to acquire an image by lighting the indicator light.

It should be noted that the present application is only described by taking the above as an example. In practical applications, the specific manner in which the scanning imaging device calls the image acquisition unit to collect images is not limited thereto.

The embodiment will be described in detail below by way of specific examples.

1) For the case where the image acquisition unit is integrated with the scanning imaging device

The image acquisition unit can be called up by the data line and the register. Specifically, a hardware connection is defined between the processor of the scanning imaging device and the image acquisition unit, and the transmission signal of the hardware connection is represented by PARTIAL_INT, wherein PARTIAL_INT is used to indicate a frame of scanned image inside the scanning imaging device. Scan status.

Inside the scanning imaging device, a new set of registers can be defined to configure the PARTIAL_INT signal.

Specifically, you can define the following registers:

REG_NEW_1: bit0=0/1, enable partial field sync signal PARTIAL_INT;

REG_NEW_1: bit1=0/1, configure repeated autoloading;

REG_NEW_1: bit2=0/1, enable the drive indicator signal;

REG_NEW_2: bit0 to 7, N=1, 2, 3, 4, 5〃〃〃N indicates that the threshold trigger is interrupted every 1/N frame;

REG_NEW_3: bit0~15, set the delay of output PARTIAL_INT, 1bit=T _{D_INT} .

Specifically, referring to FIG. 4(a), a schematic diagram of a signal pulse is shown, in which the image acquisition trigger timing corresponding to three scan periods is determined according to T _{D_INT} .

2) For the case where the image acquisition unit is integrated with the scanning imaging device

Based on the above 1), you can also define the following two registers:

REG_NEW_4: bit0~15, set the indicator output pulse delay 1bit=T _{D_IND} ;

REG_NEW_5: bit0 to 15, set the indicator output pulse width W _PULSE .

It is assumed that the scan imaging apparatus scans a scan image T ₀ of 0.5 seconds, and the exposure time T _exp of the image acquisition unit is 0.3 seconds. According to S2, the number of scan cycles can be determined to be 2, which can be obtained by calculation, and needs to be started twice. The image acquisition unit completes two exposure photographs to obtain two images, and only one exposure photograph is taken in each scan period to obtain one image, and the first image capture trigger timing is the scan start time of the scan image forming apparatus in the first scan period. -T _{D_IND} , that is, the first exposure photographing is when the first image capturing triggering moment comes, the scanning imaging device starts the image collecting unit to perform image capturing; the second image capturing triggering moment is the scanning imaging device second. The scanning period scan image 1/2 position corresponds to the time -T _{D_IND} .

Specifically, referring to FIG. 4(b), FIG. 4(b) provides another schematic diagram of signal pulses, which shows the determination of the image acquisition trigger timing corresponding to two scanning periods according to TD_IND.

In the solution provided by the embodiment, the scanning imaging device calls the image acquisition unit to perform image collection when the image capturing time corresponding to each scanning week is monitored, and the image capturing unit does not need to have timing and other functions, and the image capturing unit is required. Lower.

FIG. 5 is a schematic flowchart of another method for collecting a static image according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 1 , in this embodiment, image synthesis is performed on the collected N images, and the target is obtained. A complete image (S4) of the scanned image of the scanning imaging device, comprising:

S41: Determine an area where the scanned content in the collected N images is located.

It can be seen from the foregoing description that the acquisition time of each image corresponds to a specific time in one scanning cycle, and the scanning content corresponding to different moments in each scanning cycle is located in different regions of the scanned image, and therefore, according to the collected The correspondence between the acquisition time and the scan period of the N images is obtained, and the area where the scanned content is located in the N images is obtained.

The method for determining the image region to be collected is not limited. In addition to the above manner, the image region determined by the image may be first named as the number of scan cycles of the image corresponding scanning imaging device when the image is acquired during image acquisition. This way it is easy to determine where the captured image is located in n/N.

S42: Perform image synthesis on the collected N images according to the determined position of the region where the scan content is located in the image, to obtain a complete image of the scanned image for the scan imaging device.

Specifically, after S41, it is determined that each picture is in the area where the scanned image content is located, and may be based on every two adjacent The corresponding image overlapping area of the area is covered to obtain a new image, and the remaining N-1 images are finally superimposed into a complete image according to the rule.

Correspondingly, according to another method for determining the acquired image region of S41, the already named images are superimposed and covered in the order of arrival from small to obtain a final complete image containing all the contents of the N images.

By applying the solution provided by the embodiment, the image forming process can accurately know the region where each image is located and synthesize it into a complete image, which effectively reduces the algorithm complexity of image synthesis.

FIG. 6 is a schematic structural diagram of an apparatus for collecting a static image according to an embodiment of the present invention, which corresponds to the method flowchart shown in FIG. 1 , and includes a hardware parameter obtaining module 1 , a scanning period number determining module 2 , and an image collecting module 3 . Image synthesis module 4.

The hardware parameter obtaining module 1 is configured to obtain a scan period T _{0 of} scanning a frame scan image by the scan imaging device and an exposure time T _{exp of the} image acquisition unit;

The scan cycle number determining module 2 is configured to determine, according to the numerical relationship between the scan cycle T ₀ and the exposure time T _exp , the number of scan cycles N required to acquire a complete image;

The image acquisition module 3 is configured to invoke the image acquisition unit to acquire an image according to a preset image collection rule.

The image acquisition unit collects only one image in each scan period of the N scan periods of the scan imaging device, and the preset image acquisition rule is used to specify the image acquisition unit in each The image acquisition trigger time during the scan period ensures that the acquired N images contain all of the contents of one scanned image of the scanned imaging device.

The image synthesizing module 4 is configured to perform image synthesis on the acquired N images to obtain a complete image of the scanned image of the scanning imaging device.

It can be seen from the above that, in the solution provided by the embodiment, the scanning imaging device obtains the scan period T _{0 of} scanning a frame scan image and the exposure time T _exp of the image acquisition unit, according to the scan period T ₀ and The numerical relationship between the exposure times T _exp determines the number of scan cycles N required to acquire a complete image, and then calls the image acquisition unit to acquire N images according to preset image acquisition rules, and performs N images acquired. Image synthesis, which in turn results in a complete image of the scanned image for the scanning imaging device. Although only a part of the scanned image of the above-mentioned scanning imaging device can be acquired in one exposure period of the image capturing unit, in the solution provided by the embodiment of the present invention, image capturing is performed in multiple scanning periods of the scanning imaging device. In this way, it is ensured that the respective parts of the scanned image can be acquired, and therefore, a complete image of the scanned image of the scanning imaging apparatus can be easily acquired by means of image synthesis.

FIG. 7 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention, and the implementation shown in FIG. For example, in this embodiment, the image acquisition module 3 includes:

The first triggering time determination sub-module 31 is configured to determine an image acquisition triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device according to a preset image capturing rule.

The time interval obtaining sub-module 32 is configured to obtain a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time.

The first image acquisition sub-module 33 is configured to call the image acquisition unit to perform image collection when the earliest image acquisition trigger time is reached in the determined image acquisition trigger time, and send the obtained time interval to the image acquisition unit. So that the image acquisition unit performs image acquisition at the time interval obtained as described above.

It can be seen from the above that in the embodiment, after the scan imaging device calculates the time interval between the two image acquisition triggering moments, the time interval data is sent to the image acquisition unit, and the image acquisition unit controls the image collection. By obtaining N images, the working pressure of the scanning imaging device during image acquisition can be effectively alleviated.

FIG. 8 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 6, the image acquisition module 3 includes:

The second triggering time determining sub-module 34 is configured to determine an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device according to a preset image capturing rule.

The second image collection sub-module 35 is configured to invoke the image acquisition unit to perform image acquisition when the determined image acquisition trigger time is reached.

In the solution provided by the embodiment, the scanning imaging device calls the image acquisition unit to perform image acquisition when monitoring the image acquisition time corresponding to each scanning week, and the image acquisition unit does not need to have timing and other functions, and the image acquisition unit The requirements are lower.

FIG. 9 is a schematic structural diagram of another apparatus for collecting a static image according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 5, in this embodiment, the image synthesizing module 4 includes:

The area determining sub-module 41 is configured to determine an area where the scanned content in the collected N images is located.

The image synthesizing sub-module 42 is configured to perform image synthesis on the collected N images according to the determined position of the region where the scanning content is located in the image, to obtain a complete image of the scanned image for the scanning imaging device.

In the solution provided by the embodiment, the region where each image is located can be accurately obtained in the image synthesis process, and is synthesized into a complete image, which effectively reduces the algorithm complexity of the image synthesis.

For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the corresponding parts in the method embodiment.

It should be noted that in this context, relational terms such as first and second, etc. are only used to refer to an entity or Operation is separate from another entity or operation, and does not necessarily require or imply any such actual relationship or order. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The various embodiments in the present specification are described in a related manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

One of ordinary skill in the art can understand that all or part of the steps in implementing the above method embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, which is referred to herein. Storage media such as ROM/RAM, disk, CD, etc.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (12)

1. A method for acquiring a still image is applied to a scanning imaging device, wherein the scanned image of the scanning imaging device is a static image, and the method includes the steps of:

   Obtaining a scan period T _{0 of} scanning a frame scan image by the scanning imaging device and an exposure time T _{exp of the} image acquisition unit;

   Determining, according to the numerical relationship between the scanning period T ₀ and the exposure time T _exp , the number of scanning cycles N required to acquire a complete image;

   Calling the image acquisition unit to acquire an image according to a preset image acquisition rule, wherein the image acquisition unit collects only one image in each scan period of the N scan periods of the scan imaging device, the preset The image acquisition rule is used to specify an image acquisition triggering time of the image capturing unit in each scanning period to ensure that the collected N images contain all the contents of one scanned image of the scanning imaging device;

   Image synthesis is performed on the acquired N images to obtain a complete image of the scanned image for the scanning imaging device.
2. The method according to claim 1, wherein the determining the number N of scanning cycles required to acquire a complete image according to the numerical relationship between the scanning period T ₀ and the exposure time T _exp comprises:

   According to the scanning period T ₀ and the exposure time T _exp , according to the following relationship,

   T ₀ /N ≤ T _exp <T ₀ /(N-1),

   The number of scan cycles required to acquire a complete image is N.
3. The method according to claim 1 or 2, wherein the calling image acquisition unit collects images according to a preset image collection rule, including:

   Triggering the image acquisition unit to acquire an image according to a preset image collection rule by transmitting an electrical signal; or

   The image acquisition unit is triggered to transmit an image according to a preset image acquisition rule by transmitting an optical LED blinking manner.
4. The method according to claim 1 or 2, wherein the calling image acquisition unit collects images according to a preset image collection rule, including:

   Determining, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

   Obtaining a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time;

   Calling the image acquisition unit when the earliest image acquisition trigger time is reached at the determined image acquisition trigger time Line image acquisition, and transmitting the obtained time interval to the image acquisition unit, so that the image acquisition unit performs image acquisition according to the time interval obtained above.
5. The method according to claim 1 or 2, wherein the calling image acquisition unit collects images according to a preset image collection rule, including:

   Determining, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

   The image acquisition unit is called to perform image acquisition when the determined image acquisition trigger time is reached.
6. The method according to claim 1, wherein the performing image synthesis on the acquired N images to obtain a complete image of the scanned image of the scanning imaging device comprises:

   Determining the area of the scanned content in the collected N images;

   According to the determined position of the region where the scanning content is located in the image, image synthesis is performed on the acquired N images to obtain a complete image of the scanned image for the scanning imaging device.
7. A device for acquiring a still image is applied to a scanning imaging device, wherein the scanned image of the scanning imaging device is a static image, and the device includes:

   a hardware parameter obtaining module, configured to obtain a scan period T _{0 of} scanning a frame scan image by the scan imaging device and an exposure time T _{exp of the} image acquisition unit;

   a scan cycle number determining module, configured to determine, according to the numerical relationship between the scan cycle T ₀ and the exposure time T _exp , the number of scan cycles N required to acquire a complete image;

   An image acquisition module, configured to invoke an image acquisition unit to acquire an image according to a preset image acquisition rule, wherein the image acquisition unit collects only one image in each scan cycle of the N scan cycles of the scan imaging device The preset image acquisition rule is used to specify an image acquisition triggering time of the image capturing unit in each scanning period to ensure that the collected N images comprise a scanned image of the scanning imaging device. All content;

   An image synthesizing module is configured to perform image synthesis on the acquired N images to obtain a complete image of the scanned image of the scanning imaging device.
8. The apparatus according to claim 7, wherein the scanning cycle number determining module is specifically configured to:

   According to the scanning period T ₀ and the exposure time T _exp , according to the following relationship,

   T ₀ /N ≤ T _exp <T ₀ /(N-1),

   The number of scan cycles required to acquire a complete image is N.
9. The device according to claim 7 or 8, wherein the image acquisition module is specifically configured to:

   Triggering the image acquisition unit to acquire an image according to a preset image collection rule by transmitting an electrical signal; or

   The image acquisition unit is triggered to transmit an image according to a preset image acquisition rule by transmitting an optical LED blinking manner.
10. The device according to claim 7 or 8, wherein the image capturing module comprises: a first triggering time determining sub-module, configured to determine N of the scanning imaging devices according to a preset image capturing rule The image acquisition triggering time corresponding to each scanning period in the scanning period;

    Obtaining a sub-module for obtaining a time interval between two adjacent image acquisition triggering moments in the determined image acquisition triggering time;

    a first image collection sub-module, configured to call an image acquisition unit to perform image acquisition when the earliest image acquisition trigger time is reached in the determined image acquisition trigger time, and send the obtained time interval to the image acquisition unit, The image acquisition unit is caused to perform image acquisition in accordance with the time interval obtained as described above.
11. The apparatus according to claim 7 or 8, wherein the image acquisition module comprises:

    a second triggering time determining sub-module, configured to determine, according to a preset image capturing rule, an image capturing triggering time corresponding to each scanning period of the N scanning periods of the scanning imaging device;

    The second image collection sub-module is configured to invoke the image acquisition unit to perform image acquisition when the determined image acquisition trigger time is reached.
12. The apparatus according to claim 7, wherein the image synthesizing module comprises:

    a region determining sub-module, configured to determine an area of the scanned content in the collected N images;

    The image synthesizing sub-module is configured to perform image synthesizing on the collected N images according to the determined position of the region where the scanning content is located in the image, to obtain a complete image of the scanned image for the scanning imaging device.

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