CN113740356A - Image acquisition method, image acquisition device and non-volatile computer-readable storage medium - Google Patents
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Abstract
The disclosure relates to an image acquisition method, an image acquisition device and a non-volatile computer-readable storage medium, and relates to the technical field of image processing. The method comprises the following steps: acquiring relative displacement between the object to be detected and the image acquisition device at each moment; under the condition that the relative displacement is in accordance with the displacement parameter, acquiring subimages of the object to be detected by using an image acquisition device at the corresponding moment of the relative displacement; and determining a detection image of the article to be detected according to the plurality of acquired sub-images.
Description
Technical Field
The present disclosure relates to the field of image processing technologies, and in particular, to an image capturing method, an image capturing apparatus, and a non-volatile computer-readable storage medium.
Background
Image scanning techniques may be applied in a variety of technical fields. In a security inspection device based on a ray imaging system, images of an article can be acquired at different times so as to obtain a complete detection image.
In the related art, the timing of image acquisition is determined according to the relative speed of the radiation source and the object to be detected.
Disclosure of Invention
The inventors of the present disclosure found that the following problems exist in the above-described related art: the accuracy of the image depends on the stability of the relative speed, so that the detected image is easy to deform, and the imaging accuracy is reduced.
In view of this, the present disclosure provides an image acquisition technical solution, which can avoid the deformation problem of the detected image, thereby improving the imaging accuracy.
According to some embodiments of the present disclosure, there is provided an image acquisition method including: acquiring relative displacement between the object to be detected and the image acquisition device at each moment; under the condition that the relative displacement is in accordance with the displacement parameter, acquiring subimages of the object to be detected by using an image acquisition device at the corresponding moment of the relative displacement; and determining a detection image of the article to be detected according to the plurality of acquired sub-images.
In some embodiments, acquiring, with the image capture device, the sub-image of the object to be inspected at the time corresponding to the relative displacement in the case that the relative displacement corresponds to the displacement parameter comprises: generating a pulse trigger signal under the condition that the relative displacement is consistent with the displacement parameter; and acquiring a subimage of the object to be detected by using the image acquisition device in response to the pulse trigger signal.
In some embodiments, acquiring, with the image acquisition device, a sub-image of the item to be detected in response to the pulsed trigger signal comprises: responding to the pulse trigger signal, and emitting detection rays by using a ray source of the image acquisition device; receiving detection rays returned from the article to be detected by using a detector of the image acquisition device; and acquiring and detecting a sub-image of the article according to the returned detection ray.
In some embodiments, the displacement parameter is determined from a width of a detector of the image acquisition device.
In some embodiments, the displacement parameter is directly proportional to the width of the detector of the image acquisition device.
In some embodiments, the sub-image contains image information of the inspected article of a fixed width, the fixed width being related to a width of a detector of the image acquisition device.
In some embodiments, determining a detection image of the item to be detected from the plurality of acquired sub-images comprises: and splicing the sub-images according to the acquired time sequence to obtain a detection image of the article to be detected.
In some embodiments, the image acquisition method further comprises: identifying interfering objects other than the object to be detected in the detection image; interfering objects in the detected image are eliminated.
In some embodiments, identifying, in the inspection image, an interfering item other than the item to be inspected comprises: and determining the position of the interference object in the detection image according to the calibration image sample of the interference object.
According to further embodiments of the present disclosure, there is provided an image capturing apparatus including: the acquisition unit is used for acquiring the relative displacement between the object to be detected and the image acquisition device at each moment; the acquisition unit is used for acquiring subimages of the object to be detected by using the image acquisition device at the corresponding moment of the relative displacement under the condition that the relative displacement is in accordance with the displacement parameter; and the determining unit is used for determining the detection image of the article to be detected according to the acquired plurality of sub-images.
In some embodiments, the acquisition unit generates a pulse trigger signal if the relative displacement corresponds to the displacement parameter; and acquiring a subimage of the object to be detected by using the image acquisition device in response to the pulse trigger signal.
In some embodiments, the acquisition unit emits a detection ray with a ray source of the image acquisition device in response to the pulse trigger signal; receiving detection rays returned from the article to be detected by using a detector of the image acquisition device; and acquiring and detecting a sub-image of the article according to the returned detection ray.
In some embodiments, the displacement parameter is determined from a width of a detector of the image acquisition device.
In some embodiments, the displacement parameter is directly proportional to the width of the detector of the image acquisition device.
In some embodiments, the sub-image contains image information of the inspected article of a fixed width, the fixed width being related to a width of a detector of the image acquisition device.
In some embodiments, the determining unit splices the plurality of sub-images according to the time sequence of acquisition to obtain the detection image of the object to be detected.
In some embodiments, the image capturing apparatus further comprises: the identification unit is used for identifying interference objects except the object to be detected in the detection image; and the eliminating unit is used for eliminating the interference objects in the detection image.
In some embodiments, the identification unit determines the location of the interfering object in the detection image based on a calibrated image sample of the interfering object.
According to still further embodiments of the present disclosure, there is provided an image capturing apparatus including: a memory; and a processor coupled to the memory, the processor configured to perform the image acquisition method of any of the above embodiments based on instructions stored in the memory device.
In some embodiments, the image capturing apparatus further comprises: the radiation source is used for responding to the pulse trigger signal and emitting detection rays; and the detector is used for receiving the detection rays returned from the article to be detected.
According to still further embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the image capturing method in any of the above embodiments.
In the above embodiments, a fixed relative displacement is used as a trigger signal for image acquisition, and the sub-image acquired each time is independent of speed and dependent on the position of the object to be detected. Therefore, the problem of image deformation caused by speed fluctuation can be effectively solved, and the imaging accuracy is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:
fig. 1 illustrates a flow diagram of some embodiments of an image acquisition method of the present disclosure;
FIG. 2 shows a schematic diagram of some embodiments of an image acquisition method of the present disclosure;
FIG. 3 shows a flow diagram of further embodiments of the image acquisition method of the present disclosure;
fig. 4 illustrates a block diagram of some embodiments of an image acquisition apparatus of the present disclosure;
FIG. 5 shows a block diagram of further embodiments of an image acquisition apparatus of the present disclosure;
fig. 6 illustrates a block diagram of still further embodiments of the image acquisition apparatus of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As described above, the image data is acquired as a trigger source according to the acquisition frequency determined by the relative speed of the radiation source and the object. The imaging accuracy of such fixed frequency acquisition mode depends on the stability of the relative velocity. However, there is often a fluctuation in the relative velocity, which may cause the acquired image to be distorted, eventually resulting in low imaging accuracy.
In order to solve the technical problem, the two-dimensional or multi-dimensional image data acquisition is carried out by taking the relative displacement of the ray source and the detected object acquired by the sensor and the acquisition frequency determined by the fixed displacement parameter as a trigger source. The images acquired in this way are related to displacement, and the influence of velocity fluctuation Zhao is avoided. Therefore, the scanned object in the image can be ensured not to be deformed, and the imaging accuracy is improved. For example, the present invention can be realized by the following embodiments.
Fig. 1 illustrates a flow diagram of some embodiments of an image acquisition method of the present disclosure.
As shown in fig. 1, the method includes: step 110, acquiring relative displacement; step 120, collecting sub-images; step 130, determining a detection image.
In step 110, the relative displacement between the object to be detected and the image capturing device at each time is obtained. For example, the image acquisition device is fixed, the object to be detected moves, and the position of the object to be detected can be acquired at each moment through the position sensor, so that the relative displacement between the object to be detected and the image acquisition device is determined.
In step 120, in the case that the relative displacement matches the displacement parameter, a sub-image of the object to be inspected is acquired by the image acquisition device at a time corresponding to the relative displacement.
In some embodiments, the image acquisition frequency may be determined from the displacement parameter. For example, a sub-image of the item to be inspected may be acquired each time the item to be inspected moves relative to the image acquisition device by a distance equal to the displacement parameter.
In some embodiments, the equidistant position output signals of the to-be-detected object may be generated according to the real-time position data of the to-be-detected object acquired by the position sensor. That is, the equidistant position output signal is generated once every time the article to be detected moves relative to the image capture device by a distance equal to the displacement parameter.
For example, the equidistant position output signal may be a high-low level signal or may be equidistant position information in the real-time position data. And sending a pulse trigger signal to the image acquisition device according to the distance position output signal. After receiving the pulse, the image acquisition device executes beam outgoing of the ray source (sends out a detection beam) and acquisition imaging of the detector.
In some embodiments, in the event that the relative displacement coincides with the displacement parameter, generating a pulsed trigger signal; and acquiring a subimage of the object to be detected by using the image acquisition device in response to the pulse trigger signal.
For example, in response to a pulse trigger signal, a radiation source of the image acquisition device is used for emitting detection rays; receiving detection rays returned from the article to be detected by using a detector of the image acquisition device; and acquiring a subimage of the object to be detected according to the returned detection ray.
In some embodiments, the sub-image contains image information of a fixed width of the inspected article. The fixed width is related to the width of the detector of the image acquisition device. For example, if the detector has a width of 10mm, the sub-image acquired at a time may be a column of image data having a width of 10 mm.
In some embodiments, the displacement parameter is determined from a width of a detector of the image acquisition device. For example, the displacement parameter is proportional to the width of the detector of the image acquisition device.
In some embodiments, the relative displacement between the inspected article and the imaging system at each image acquisition is determined as a displacement parameter from different detectors. For example, each time the sensor of the image acquisition device acquires the relative displacement of the displacement parameter length, a pulse starting signal is output; responding to the pulse trigger signal, and performing primary ray source beam-emitting processing and detector acquisition processing.
For example, each sub-image acquired by the detector is a column of image data of the object to be detected along the vertical direction of the ray and with the width of 10 mm. In this case, the displacement parameter may be set to 10 mm.
Namely, when the sensor acquires an output signal at an equidistant position with the relative displacement of 10mm between the object to be detected and the imaging system, the beam-emitting processing of the radioactive source and the acquisition processing of the detector are triggered. Therefore, the image data acquired each time has a corresponding relation with the article to be detected, and the detection image can be determined by acquiring the image data for multiple times.
In step 130, a detection image of the object to be detected is determined based on the plurality of sub-images acquired.
In some embodiments, each acquisition process of the image acquisition device may acquire a series of image data of the object to be detected as the sub-image. The sub-images acquired for many times can be spliced into a complete image as a detection image.
Therefore, the position information is used as a trigger source, so that the image data acquired each time are matched with the actual position of the article to be detected and are irrelevant to the speed. Therefore, the final generated detection image is finer and closer to a real object.
Fig. 2 shows a schematic diagram of some embodiments of the image acquisition method of the present disclosure.
As shown in fig. 2, the image capturing device 21 is fixed, and the object 22 to be detected moves at a speed v, which may be a variable value.
For each equidistant displacement of the object 22 to be detected relative to the image acquisition device 21, the sensor (not shown) will send an equidistant position output signal for triggering the emission of the radiation source and the acquisition by the detector.
For example, a displacement parameter of 10mm is set, and the sensors detect the objects 22 to be detected respectively at the time T1、T2、T3Moved by 10mm relative to the image acquisition means 21. In this case, the radiation source (not shown) and the detector (not shown) of the image acquisition apparatus 21 perform the beam-out and acquisition processes, respectively, to acquire the sub-images 221, 222, 223 at the corresponding time instants.
In some embodiments, the sub-image contains image information of a fixed width of the inspected article. The fixed width is related to the width of the detector of the image acquisition device. For example, the plurality of sub-images may be stitched according to the time sequence of acquisition to obtain the detection image of the object to be detected.
For example, it may be according to time T1、T2、T3The corresponding image 221, the sub-image 222 and the sub-image 223 are spliced into a complete image of the object 22 to be detected as a detection image.
Thus, the timing of acquiring the sub-image is determined according to the position information of the object 22 to be detected, and the generated detection image has a corresponding relationship with the shape and size of the object 22 to be detected. Therefore, the detection image can show the shape and the size of the object 22 to be detected more truly (the detection image is not deformed, and the data are not overlapped).
In some embodiments, the desired image data may be acquired by post-processing of the inspection image, such as image silhouette, peeling, etc. This may be achieved, for example, by the embodiment of fig. 3.
Fig. 3 shows a flow chart of further embodiments of the image acquisition method of the present disclosure.
As shown in fig. 3, compared to the above embodiment, the present embodiment further includes: step 310, identifying an interfering item; and step 320, removing the interfering object.
In step 310, interfering objects other than the object to be detected are identified in the detection image. For example, the position of the interfering object in the detection image is determined according to a calibration image sample of the interfering object.
In step 320, the interfering item in the detected image is eliminated. For example, the detection image has a part of an interfering object, such as a dragging device dragging the object to be detected to move. Since the detection image obtained by the method in the above embodiment has an advantage of not generating deformation, the shape and size of the interfering article are matched with the actual in the image to be detected.
By utilizing the point, the image only containing the interference object can be collected as a calibration image sample; by calibrating the corresponding relation between the image sample and the interference object in the detection image, on the premise of not losing effective data (object to be detected), useless data (namely the interference object) which is not expected to be displayed in the real detection image is eliminated. For example, the interfering object in the actual detection image can be eliminated by processing methods such as image silhouette and peeling.
In the above embodiment, the image acquisition is performed by outputting signals at equidistant positions of the sensors as trigger sources. Thus, the influence of the speed fluctuation on the image display at a constant frequency can be effectively eliminated. The technical scheme can be applied to various two-position or multi-dimensional imaging technologies such as silhouette, peeling and the like, and can be used for accurately acquiring image data.
Fig. 4 illustrates a block diagram of some embodiments of an image acquisition apparatus of the present disclosure.
As shown in fig. 4, the image pickup device 4 includes an acquisition unit 41, a pickup unit 42, and a determination unit 43.
The acquisition unit 41 acquires the relative displacement between the object to be detected and the image acquisition device at each time.
The acquisition unit 42 acquires sub-images of the object to be inspected using the image acquisition device at the time corresponding to the relative displacement when the relative displacement corresponds to the displacement parameter.
In some embodiments, the acquisition unit 42 generates a pulse trigger signal in case the relative displacement coincides with the displacement parameter; and acquiring a subimage of the object to be detected by using the image acquisition device in response to the pulse trigger signal.
In some embodiments, the displacement parameter is determined from a width of a detector of the image acquisition device. For example, the displacement parameter is proportional to the width of the detector of the image acquisition device.
In some embodiments, the acquisition unit 42 emits the detection radiation with the radiation source of the image acquisition device in response to the pulse trigger signal; receiving detection rays returned from the article to be detected by using a detector of the image acquisition device; and acquiring and detecting a sub-image of the article according to the returned detection ray.
The determining unit 43 is configured to determine a detection image of the object to be detected according to the plurality of collected sub-images.
In some embodiments, the sub-image contains image information of the inspected article of a fixed width, the fixed width being related to a width of a detector of the image acquisition device. For example, the determining unit 43 splices the plurality of sub-images in the time sequence of acquisition to obtain a detection image of the object to be detected.
In some embodiments, the image acquisition device 4 further comprises: an identifying unit 44 for identifying, in the detection image, an interfering article other than the article to be detected; and a eliminating unit 45 for eliminating the interfering article in the detection image. For example, the recognition unit 44 determines the location of the interfering object in the detection image based on a calibrated image sample of the interfering object.
Fig. 5 shows a block diagram of further embodiments of the image acquisition apparatus of the present disclosure.
As shown in fig. 5, the image pickup device 5 of this embodiment includes: a memory 51 and a processor 52 coupled to the memory 51, the processor 52 being configured to execute the image capturing method in any one of the embodiments of the present disclosure based on instructions stored in the memory 51.
The memory 51 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a BootLoader, a database, and other programs.
In some embodiments, the image capturing device 5 further includes: a radiation source 53 for emitting a detection ray in response to the pulse trigger signal; a detector 54 for receiving the detected radiation returning from the item to be detected.
Fig. 6 illustrates a block diagram of still further embodiments of the image acquisition apparatus of the present disclosure.
As shown in fig. 6, the image pickup device 6 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610, the processor 620 being configured to perform the image capturing method of any of the preceding embodiments based on instructions stored in the memory 610.
The memory 610 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a BootLoader, and other programs.
The image capturing apparatus 6 may further include an input-output interface 630, a network interface 640, a storage interface 650, and the like. These interfaces 630, 640, 650 and the connections between the memory 610 and the processor 620 may be through a bus 660, for example. The input/output interface 630 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, a microphone, and a sound box. The network interface 640 provides a connection interface for various networking devices. The storage interface 650 provides a connection interface for external storage devices such as an SD card and a usb disk.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media having computer-usable program code embodied therein, including but not limited to disk storage, CD-ROM, optical storage, and the like.
So far, the image capturing method, the image capturing apparatus, and the nonvolatile computer readable storage medium according to the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (13)
1. An image acquisition method comprising:
acquiring relative displacement between the object to be detected and the image acquisition device at each moment;
under the condition that the relative displacement is in accordance with the displacement parameter, acquiring sub-images of the object to be detected by using the image acquisition device at the corresponding moment of the relative displacement;
and determining a detection image of the article to be detected according to the plurality of collected sub-images.
2. The image capturing method according to claim 1, wherein the capturing the sub-image of the object to be detected by the image capturing device at the time corresponding to the relative displacement when the relative displacement matches the displacement parameter comprises:
generating a pulse trigger signal under the condition that the relative displacement is consistent with the displacement parameter;
and responding to the pulse trigger signal, and acquiring a sub-image of the to-be-detected object by using the image acquisition device.
3. The image acquisition method according to claim 2, wherein said acquiring, with the image acquisition device, a sub-image of the item to be detected in response to the pulse trigger signal comprises:
responding to the pulse trigger signal, and emitting detection rays by using a ray source of the image acquisition device;
receiving detection rays returned from the article to be detected by using a detector of the image acquisition device;
and acquiring a sub-image of the detected article according to the returned detection ray.
4. The image acquisition method according to claim 1,
the displacement parameter is determined according to the width of a detector of the image acquisition device.
5. The image acquisition method according to claim 4,
the displacement parameter is proportionally related to the width of a detector of the image acquisition device.
6. The image acquisition method according to claim 1,
the sub-image comprises image information of the inspected article with a fixed width, wherein the fixed width is related to the width of a detector of the image acquisition device;
the determining the detection image of the article to be detected according to the plurality of collected sub-images comprises:
and splicing the sub-images according to the acquired time sequence to obtain a detection image of the article to be detected.
7. The image acquisition method according to any one of claims 1 to 6, further comprising:
identifying interfering objects other than the object to be detected in the detection image;
eliminating the interfering object in the detection image.
8. The image capturing method according to claim 7, wherein the identifying, in the inspection image, the interfering object other than the object to be inspected includes:
and determining the position of the interference object in the detection image according to the calibration image sample of the interference object.
9. An image acquisition apparatus comprising:
the acquisition unit is used for acquiring the relative displacement between the object to be detected and the image acquisition device at each moment;
the acquisition unit is used for acquiring the subimages of the article to be detected by using the image acquisition device at the corresponding moment of the relative displacement under the condition that the relative displacement is in accordance with the displacement parameter;
and the determining unit is used for determining the detection image of the article to be detected according to the acquired plurality of sub-images.
10. The image acquisition apparatus according to claim 9, further comprising:
the identification unit is used for identifying interference objects except the object to be detected in the detection image;
a removal unit for removing the interfering object in the detection image.
11. An image acquisition apparatus comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the image acquisition method of any of claims 1-8 based on instructions stored in the memory.
12. The image acquisition apparatus according to claim 11, further comprising:
the radiation source is used for responding to the pulse trigger signal and emitting detection rays;
and the detector is used for receiving the detection rays returned from the article to be detected.
13. A non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the image acquisition method of any one of claims 1-8.
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| CN202010477296.1A CN113740356A (en) | 2020-05-29 | 2020-05-29 | Image acquisition method, image acquisition device and non-volatile computer-readable storage medium |
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Application publication date: 20211203 |