CN113723393B - Image acquisition method, image acquisition device, electronic device, and medium - Google Patents
Image acquisition method, image acquisition device, electronic device, and medium Download PDFInfo
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- CN113723393B CN113723393B CN202111291203.7A CN202111291203A CN113723393B CN 113723393 B CN113723393 B CN 113723393B CN 202111291203 A CN202111291203 A CN 202111291203A CN 113723393 B CN113723393 B CN 113723393B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
Abstract
The embodiment of the application discloses an image acquisition method, an image acquisition device, electronic equipment and a medium. The method comprises the following steps: determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector; determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquisition device and the resolution of the image acquisition device in the second direction; and determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire images on the display screen at the new acquisition scanning frequency. According to the scheme, the display scanning frequency of the display screen can be determined through the single-frame stripe image, so that a new acquisition scanning frequency is determined, and image acquisition is performed on the display screen at the new acquisition scanning frequency, so that stripe interference in the acquired image is eliminated.
Description
Technical Field
The embodiment of the application relates to the technical field of image acquisition, in particular to an image acquisition method, an image acquisition device, electronic equipment and a medium.
Background
When the display screen displays, the light-emitting units are periodically turned on and off, and the whole display screen is in periodic scanning display. For example, OLED screens are widely used in current mobile phones, and the OLED screens generally use PWM (Pulse width modulation) dimming. When the image acquisition is performed on the display screen through the image acquisition device, interference fringes exist on the image of the display screen acquired by the image acquisition device due to the uncoordinated relationship between the scanning display frequency of the display screen and the acquisition scanning frequency of the image acquisition device.
At present, the scheme for eliminating the stripes in the collected images needs to know the scanning display frequency of the display screen, or the scanning display frequency of the display screen is determined through multi-frame images or other additional devices, so that the scheme is complicated and is not easy to realize.
Disclosure of Invention
The embodiment of the application provides an image acquisition method, an image acquisition device, electronic equipment and a medium, so that the scanning display frequency of a display screen can be conveniently and accurately determined, a new acquisition scanning frequency can be accurately determined for image acquisition, and the fringe interference in the acquired image can be eliminated.
In one embodiment, the present application provides an image capturing method, including:
determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction;
and determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
In another embodiment, the present application further provides an image capturing apparatus, including:
the length determining module is used for determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
a display scanning frequency determining module, configured to determine a display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer, and the resolution of the image acquirer in the second direction;
and the acquisition module is used for determining a new acquisition scanning frequency according to the display scanning frequency and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
In another embodiment, an embodiment of the present application further provides an electronic device, including: one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the image acquisition method according to any one of the embodiments of the present application.
In one embodiment, the present application further provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the image capturing method according to any one of the embodiments of the present application.
According to the technical scheme in the embodiment of the application, the first length of any stripe in a stripe image in a first direction and the second length of any stripe in a second direction are determined; the stripe image is obtained by image acquisition of a display screen by an image acquisition device, the first direction is the display scanning direction of the display screen, and the second direction is the acquisition scanning direction of the image acquisition device; determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction, conveniently and accurately determining the scanning display frequency of the display screen only according to a single-frame image without a multi-frame image or an additional device under the condition that the scanning display frequency of the display screen is unknown, determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquirer to acquire the image of the display screen at the new acquisition scanning frequency, so that the acquisition scanning frequency is adaptively adjusted according to the scanning display frequency of the display screen, and the image acquirer is controlled to acquire the image of the display screen at the new acquisition scanning frequency to eliminate the stripe interference in the acquired image, resulting in a high quality image.
Drawings
Fig. 1 is a flowchart of an image acquisition method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a severe streak image provided in accordance with an embodiment of the present application;
FIG. 3 is a schematic illustration of a light fringe image provided in one embodiment of the present application;
FIG. 4 is a first schematic view of a scanning display of a display screen according to an embodiment of the present application;
FIG. 5 is a second schematic view of a scanning display of a display screen according to an embodiment of the present application;
FIG. 6 is a third schematic view of a scanning display of a display screen according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a striped image on a slanted display panel according to an embodiment of the present disclosure;
FIG. 8 is a flowchart of an image acquisition method according to another embodiment of the present application;
FIG. 9 is a flowchart of an image acquisition method according to another embodiment of the present application;
FIG. 10 is a schematic view of a fringe angle provided in accordance with yet another embodiment of the present application;
FIG. 11 is a schematic diagram of a main code stream according to an embodiment of the present application;
FIG. 12 is a schematic diagram of a decision code stream according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of an image capturing device according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
Detailed Description
Fig. 1 is a flowchart of an image acquisition method according to an embodiment of the present application. The image acquisition method provided by the embodiment of the application can be suitable for the condition of image acquisition. Typically, the embodiment of the application is suitable for the condition of image acquisition of the display screen. The method may be specifically performed by an image acquisition apparatus, which may be implemented by means of software and/or hardware, which may be integrated in an electronic device capable of implementing the image acquisition method. Referring to fig. 1, the method of the embodiment of the present application specifically includes:
s110, determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector.
The display screen may be a screen of an electronic device such as a mobile phone, a tablet computer, or a computer, or may also be an OLED display screen, an LED display screen, or the like that is only used for displaying. When the image acquisition is performed on the display screen through the image acquisition device, because the display scanning frequency of the display screen and the acquisition scanning frequency of the image acquisition device have an asymmetric relationship, stripes may appear in the region of the display screen in the acquired image, the image of the region corresponding to the display screen in the acquired image is used as a stripe image, the stripe image with serious stripe interference is shown in fig. 2, and the stripe image with slight stripe interference is shown in fig. 3. In the case of a streak interference in an image, recognition of the image, for example, recognition of information such as a two-dimensional code or a barcode in the image, may be affected.
On the luminous unit of the display screen, brightness is displayed in a pulse mode, the whole effect is similar to a window or stripes, the brightness in the window is high, and the brightness outside the window is low. As shown in fig. 4, taking a mobile phone as an example, the display screen scans from top to bottom for display, the flashing lines move from top to bottom, the moving speed or the number of pixel lines moving per unit time (per second) is LNums = LNum × Freq, LNum is the total number of pixel lines on the mobile phone screen, Freq (hz) is the screen refresh frequency, which is not equal to the PWM modulation frequency, and the PWM modulation frequency is an integer multiple thereof. If the mobile phone refresh rate is 120Hz, the PWM modulation frequency (N × Freq) may be 120Hz or 240 Hz. The image collector generally adopts a rolling shutter, namely, the scanning exposure is carried out line by line, until all pixels are exposed, the data are read out, the exposure time of the pixels in the same line is the same, and the exposure time of the pixels in different lines is different. When the image collector collects images, the images are generally scanned from left to right, and the scanning direction of the image collector is perpendicular to the scanning direction of the display screen, so that oblique stripes appear in the collected images. If the scanning direction of the image collector is the same as the scanning direction of the display screen, stripes parallel to the scanning direction are displayed. As shown in fig. 5, if the mobile phone is rotated by 90 degrees, that is, the scanning direction of the mobile phone screen is from left to right, and the direction of image acquisition by the image acquirer is also from left to right, a vertical stripe is displayed in the acquired image. If the brightness of the display screen is adjusted to be low, the modulation period of the display screen needs to be adjusted to be small, the modulation period is changed to be 1/(N × Freq), at this time, N stripes rather than a flash window may appear on the display screen, as shown in fig. 6, but at this time, 1/Freq is still an integral multiple of 1/(N × Freq), and the collecting scanning frequency of the image collector can still be determined according to the method provided by the embodiment of the application.
The technical scheme of the embodiment of the application is suitable for the condition that the first direction is inconsistent with the second direction, namely the condition that the display scanning direction of the display screen is inconsistent with the collecting scanning direction of the image collector. Under the condition that the first direction is not consistent with the second direction, the stripes form a certain angle with the edge of the stripe image, and the scheme in the application can be realized. In this embodiment of the application, the display scanning direction of the display screen may be a direction from top to bottom in the stripe image of fig. 2, and the collecting scanning direction of the image collector may be a direction from left to right in the stripe image of fig. 2, that is, the first direction is perpendicular to the second direction. The first direction and the second direction may also be at other angles (except for the case where the first direction and the second direction are parallel), as shown in fig. 7, where the direction a is a display scanning direction of the display screen, and the direction b is a collecting scanning direction of the image collector.
In the embodiment of the application, a first length of the stripe in a first direction and a second length of the stripe in a second direction need to be determined, so that the length of the display scan of the display screen within a period of time is reflected by the first length, and the length of the scan acquired by the image acquisition device within the same period of time is reflected by the second length, so that the display scan frequency of the display screen is determined according to the first length, the second length and the same period of time.
S120, determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction.
The resolution of the image collector in the second direction refers to a length scanned by the image collector in one collecting and scanning period, and corresponds to a collecting and scanning frequency of the image collector. The length of the display screen in the first direction is the length scanned by the display screen in one display scanning period, and corresponds to the display scanning frequency of the display screen. The first length is the length of the display screen scanned in an unknown and fixed time, the second length is the length of the display screen scanned in an unknown and fixed time, and the first length and the second length both correspond to the unknown and fixed time.
In the embodiment of the application, according to the corresponding relationship, the display scanning frequency of the display screen can be obtained through solving, so that under the condition that the display scanning frequency of the display screen is unknown in advance, the display scanning frequency of the display screen is determined through a single-frame stripe image, and then the acquisition scanning frequency of the image acquisition device is adjusted according to the display scanning frequency of the display screen, so that stripe interference in the acquired image is eliminated.
And S130, determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
For example, if the acquisition scan period of the image acquirer is less than the display scan period of the display, stripes may appear in the acquired image, and if the acquisition scan period of the image acquirer is equal to the display scan period of the display or is an integral multiple of the display scan period of the display, stripes may not appear in the acquired image.
According to the technical scheme in the embodiment of the application, the first length of any stripe in a stripe image in a first direction and the second length of any stripe in a second direction are determined; the stripe image is obtained by image acquisition of a display screen by an image acquisition device, the first direction is the display scanning direction of the display screen, and the second direction is the acquisition scanning direction of the image acquisition device; according to the first length, the second length, the length of the display screen in the first direction, the collecting and scanning frequency of the image collector and the resolution of the image collector in the second direction, the display scanning frequency of the display screen is determined, under the condition that the scanning and displaying frequency of the display screen is unknown, a plurality of frames of images or additional devices are not needed, the scanning and displaying frequency of the display screen is conveniently and accurately determined only according to a single frame of image, and a new collecting and scanning frequency is determined according to the display scanning frequency, so that the collecting and scanning frequency is adaptively adjusted according to the scanning and displaying frequency of the display screen, the image collector is controlled to collect images on the display screen at the new collecting and scanning frequency, the stripe interference in the collected images is eliminated, and high-quality images are obtained.
In this embodiment of the application, before S110, graying and binarization processing may be performed on the stripe image, so that the edge of the stripe in the stripe image is clearer, and subsequent identification and processing of the stripe are facilitated.
Fig. 8 is a flowchart of an image capturing method according to another embodiment of the present application. For further optimization of the embodiments, details which are not described in detail in the embodiments of the present application are described in the embodiments. Referring to fig. 8, an image acquisition method provided in an embodiment of the present application may include:
s210, determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector.
S220, according to the first length, the length of the display screen in the first direction and the display scanning frequency of the display screen, representing the first time required for the display screen to scan and display the stripes.
Illustratively, the first time t1 is expressed according to the following formula: t1= (LNumt/LNum)/Freq; wherein, LNumt is first length, and LNum is the length of display screen in the first direction, and Freq is the display scanning frequency of display screen.
And S230, determining a second time required for the image collector to scan and collect the stripes according to the second length, the collecting and scanning frequency of the image collector and the resolution of the image collector in the second direction.
Illustratively, the second time t2 is determined according to the following equation: t2= (HNumt/D)/Freqsen, where HNumt is the second length, D is the resolution of the image collector in the second direction, and Freqsen is the collection scan frequency of the image collector. In this embodiment of the application, the first length, the second length, and the resolution of the image collector in the second direction all represent the number of the pixel points, and the resolution of the image collector in the second direction refers to the number of the pixel points scanned by the image collector in the horizontal direction in the collection scanning period.
S240, determining the display scanning frequency according to the first time and the second time.
Specifically, the display scan frequency Freq is determined based on the relationship between the first time and the second time.
In this embodiment, determining the display scanning frequency according to the first time and the second time includes: establishing an equality relationship between the first time and the second time represented; the display scan frequency in the equality is solved.
Illustratively, the first length is a length of the display screen scanned during an unknown and fixed period of time, the second length is a length of the display screen scanned during an unknown and fixed period of time, and the first length and the second length both correspond to the unknown and fixed period of time, i.e., the first time and the second time are equal, and therefore, an equation representing the first time and the second time is established, and the display scanning frequency is solved from the equation relationship. Specifically, let t1= t2, i.e., (HNumt/D)/Freqsen = (LNumt/LNum)/Freq, from which Freq is solved.
And S250, determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
According to the technical scheme in the embodiment of the application, according to the first length, the length of the display screen in the first direction and the display scanning frequency of the display screen, representing the first time required by the display screen to scan and display the stripes, determining the second time required by the image collector to scan and collect the stripes according to the second length, the collecting and scanning frequency of the image collector and the resolution of the image collector in the second direction, establishing an equation according to the relationship that the first time and the second time are equal, solving the display scanning frequency, accurately determining the acquisition scanning frequency of the display screen through the stripes in the single-frame stripe image on the basis of not knowing the acquisition scanning frequency of the display screen in advance, and further determining the new acquisition scanning frequency of the image acquisition device and eliminating the stripe interference in the acquired image.
Fig. 9 is a flowchart of an image capturing method according to another embodiment of the present application. For further optimization of the embodiments, details which are not described in detail in the embodiments of the present application are described in the embodiments. Referring to fig. 9, an image acquisition method provided in an embodiment of the present application may include:
s310, determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector.
In an embodiment of the present application, determining a first length of any stripe in a stripe image in a first direction and a second length in a second direction includes: determining a first length of the stripe in a first direction according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image; and determining a second length of the stripe in the second direction according to the pixel coordinate of the endpoint of the stripe and the deviation angle of the stripe and the second direction.
Illustratively, a triangle formed by the stripe and the edge of the stripe image is identified, and three vertexes of the triangle are respectively two end points of the stripe and one vertex of the stripe image. And determining the side of the triangle parallel to the first direction, wherein the side of the side has the first length of the stripe in the first direction. As shown in fig. 10, AB is a stripe, C is one vertex of the stripe image, and the first direction is the direction indicated by a. In triangle ABC, the side parallel to a is BC, i.e., BC is the first length of the stripe in the first direction. Specifically, the length of BC, i.e., the first length, may be calculated from the pixel coordinates of B point and the pixel coordinates of C point. Assuming that the deviation angle of the fringes from the second direction is α, the second length of the fringes in the second direction is the projection of the fringes in the second direction, i.e. the product of the fringe length and cos α. The stripe length may be calculated from the pixel coordinates of the two end points of the stripe. In fig. 10, the direction indicated by b is the second direction.
In the embodiment of the present application, the determining of the deviation angle of the stripe from the second direction includes: determining an included angle between the stripe and the edge of the stripe image according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image; and determining the deviation angle between the stripe and the second direction according to the included angle and the deviation angle between the edge of the stripe image and the second direction.
For example, as shown in fig. 10, a triangle formed by the stripe and the edge of the stripe image, that is, a triangle ABC is identified, in the triangle ABC, an included angle between the stripe and the edge of the stripe image is determined, specifically, the length of the edge AB may be determined according to the pixel coordinate of the end point of the stripe, the lengths of the edge AC and the edge BC may be determined according to the vertex coordinate of the stripe image, that is, the coordinate of the point, and the end point coordinate of the stripe, and the lengths of any two of the edge AB, the edge AC, and the edge BC may be actually determined. And determining the angle beta according to the determined lengths of any two edges. For example, from the length of edge AC and the length of edge AB, cos β, and hence the value of β, is determined. Knowing the angle between the edge AC and the stripe, the deviation angle of the stripe from the second direction is determined from the deviation angle between the edge AC and the second direction. Further, the deviation angle of the side AC from the second direction may be determined according to the deviation angle of the side AC from the horizontal direction and the deviation angle of the second direction from the horizontal direction. The deviation angle of the second direction from the horizontal direction is known, and the deviation angle γ of the side AC from the horizontal direction can be determined according to the length of the side AD and the length of the side CD in the triangular ACD. The length of the side AD is the ordinate of the pixel coordinate of the point a minus the ordinate of the pixel coordinate of the point C. The length of the edge CD is the abscissa of the pixel coordinate of the point C minus the pixel coordinate of the point a.
S320, determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction.
S330, determining the display scanning period of the display screen according to the display scanning frequency.
Illustratively, after the display scanning frequency Freq is determined, the display scanning period of the display screen is 1/Freq.
S340, determining a target acquisition scanning period of the image acquisition device according to the candidate acquisition scanning period which is greater than or equal to the display scanning period.
Illustratively, if the scanning period acquired by the image acquirer is an integral multiple of the PWM modulation period, the image acquired by the image acquirer for the display screen image does not have stripe interference, the modulation frequency is generally an integral multiple of the display scanning frequency, the modulation frequency is nFreq, and the modulation period is 1/nFreq. The acquisition scanning period of the image acquisition device is integral multiple of 1/nFreq, namely, the acquired display screen image can not have stripe interference, and the acquisition scanning period 1/Freq is integral multiple of the modulation period 1/nFreq, so the acquisition scanning period is the display scanning period 1/Freq or integral multiple of the display scanning period 1/Freq, namely, the acquired display screen image can not have stripe interference.
In the embodiment of the present application, a value greater than or equal to the display scan period is used as a candidate acquisition scan period, and a value equal to the display scan period or an integral multiple of the display scan period is selected from the candidate acquisition scan periods as a target acquisition scan period.
And S350, determining a new acquisition scanning frequency of the image acquisition device according to the target acquisition scanning period.
Illustratively, a target acquisition scan period T is determined from the candidate acquisition scan periods, and 1/T is the new acquisition scan frequency.
And S360, controlling the image collector to collect the images of the display screen at the new collection scanning frequency.
According to the technical scheme, the new acquisition scanning frequency of the image acquisition device is determined according to the display scanning frequency of the display screen, so that the new acquisition scanning period is equal to the display scanning period or is an integral multiple of the display scanning period, the image acquisition device is controlled to carry out the image acquisition on the display screen at the new acquisition scanning frequency, and therefore the stripe interference in the image obtained when the image acquisition is carried out on the display screen is conveniently eliminated through the detection of the single-frame image.
The embodiment of the present application is a detailed introduction to a specific implementation of an image capturing method, and details that are not described in detail in the embodiment of the present application are described in the above embodiment. The method can comprise the following steps:
the camera adopts two paths of code streams, the camera collects images of the display screen at 30 frames/second, the main output code stream is 25 frames/second, common exposure is adopted for exposure control, and the obtained main code stream is presented to a user, for example, as shown in fig. 11. Another 5 frames/second, for example, 6 th, 12 th, 18 th, 24 th and 30 th frames are taken to perform exposure of the fixed shutter, for example, low exposure, to form a determination code stream, which is mainly used for determining the screen refresh frequency and is not presented to the user, as shown in fig. 12.
And carrying out graying and binarization processing on the determined code stream.
The method comprises the steps of extracting the edge of a mobile phone screen, identifying the bright screen range of the mobile phone, and determining the length LNum of the mobile phone according to the vertex coordinates or the short-edge-to-edge midpoint coordinates of the bright screen range of the mobile phone. Selecting any one of the stripes, calculating the projection length LNumt of one side of the stripe in the vertical direction, such as 1069, calculating the projection length HNumt of one side of the stripe in the horizontal direction, such as 506, knowing the value D of the camera resolution in the horizontal direction, such as 1080, and the acquisition scanning frequency Freqsen of the camera.
Calculating the refreshing frequency of the mobile phone:
when the camera scanning length is HNumt, the scanning length is t, and in the same time, the mobile phone scanning length is LNumt:
t = (HNumt/D ) / Freqsen = (LNumt / LNum) / Freq。
substituting data calculates Freq, e.g., 58.7 Hz.
Some common screen refreshing frequencies are input in the device in advance, data correction is carried out, data which are closest to 58.7 Hz in the screen refreshing frequencies input in advance are selected, and finally the screen refreshing frequency such as 60Hz is obtained.
Exposure shutter adjustment, stripe elimination:
knowing that the refresh rate is 60Hz, fixing the main stream shutter to 1/60 seconds, or an integer multiple of 1/60 seconds, can eliminate the stripes.
The exposure adjusting method comprises the following steps:
when the shutter is determined, the brightness still needs to be adjusted to a proper brightness, i.e. the brightness of the image detected in real time is compared with the preset brightness (exposure target value). The adjusting method comprises the following steps: under the current shutter, if the brightness of the image detected in real time does not reach the exposure target value, the gain is adjusted, when the gain reaches 6db and the brightness of the image detected in real time still does not reach the exposure target value, the shutter is adjusted to 1/30 seconds, namely 1/60 times of 2, the gain is adjusted to 0db, if the brightness of the image detected in real time still does not reach the exposure target value, the gain is continuously adjusted upwards until the upper limit of the gain is reached, if the brightness of the image detected in real time still does not reach the exposure target value, the shutter is adjusted to 1/15 seconds, namely 1/60 times of 3, the gain is adjusted to 0db, and so on, the shutter and the gain are alternately adjusted until the brightness of the image detected in real time reaches the exposure target value. To summarize: the shutter is adjusted according to integral multiple of the screen refreshing period, and when the shutter is not more than one time, the gain is adjusted. Such an exposure method can obtain appropriate brightness and can eliminate streaks.
Fig. 13 is a schematic structural diagram of an image capturing device according to an embodiment of the present application. The device can be suitable for the situation of carrying out image acquisition. Typically, the embodiment of the application is suitable for the condition of image acquisition of the display screen. The apparatus may be implemented by software and/or hardware, and the apparatus may be integrated in an electronic device. Referring to fig. 13, the apparatus specifically includes:
a length determining module 410, configured to determine a first length of any stripe in the stripe image in the first direction and a second length in the second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
a display scanning frequency determining module 420, configured to determine a display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the collecting scanning frequency of the image collector, and the resolution of the image collector in the second direction;
and the acquisition module 430 is configured to determine a new acquisition scanning frequency according to the display scanning frequency, and control the image acquirer to perform image acquisition on the display screen at the new acquisition scanning frequency.
In this embodiment of the present application, the display scan frequency determining module 420 includes:
and the first time determining unit is used for representing the first time required by the display screen to scan and display the stripes according to the first length, the length of the display screen in the first direction and the display scanning frequency of the display screen.
And the second time representing unit is used for determining second time required by the image collector to scan and collect the stripes according to the second length, the collection scanning frequency of the image collector and the resolution of the image collector in the second direction.
A determining unit, configured to determine the display scanning frequency according to the first time and the second time of the representation.
In an embodiment of the present application, the determining unit is specifically configured to:
establishing an equality relationship between the first time and the second time represented;
the display scan frequency in the equality is solved.
In this embodiment of the present application, the acquisition module 430 includes:
and the display scanning period determining unit is used for determining the display scanning period of the display screen according to the display scanning frequency.
And the target acquisition scanning period determining unit is used for determining the target acquisition scanning period of the image acquisition device according to the candidate acquisition scanning period which is greater than or equal to the display scanning period.
And the acquisition scanning frequency determining unit is used for determining the new acquisition scanning frequency of the image acquisition device according to the target acquisition scanning period.
In an embodiment of the present application, the apparatus further includes:
and the image acquisition module is used for controlling the image acquisition device to acquire images of the display at a preset image acquisition frame rate.
And the fringe image acquisition module is used for controlling the image acquisition device to acquire images at a preset exposure amount when acquiring images of preset frames in the image acquisition process so as to obtain the fringe images.
The preset exposure is smaller than the exposure when other frame images except the preset frame are acquired.
In this embodiment, the length determining module 410 includes:
and the stripe length determining unit is used for determining the horizontal length of the stripe in the horizontal direction and the vertical length of the stripe in the vertical direction according to the pixel coordinate of the endpoint of the stripe.
And the first length determining unit is used for determining the first length of the stripe in the first direction according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image.
And the second length determining unit is used for determining the second length of the stripe in the second direction according to the pixel coordinate of the endpoint of the stripe and the deviation angle of the stripe and the second direction.
In an embodiment of the present application, the apparatus further includes:
and the included angle determining unit is used for determining the included angle between the stripe and the edge of the stripe image according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image.
And the deviation angle determining unit is used for determining the deviation angle between the stripe and the second direction according to the included angle and the deviation angle between the edge of the stripe image and the second direction.
The image acquisition device provided by the application embodiment can execute the image acquisition method provided by any embodiment of the application, and has corresponding functional modules and beneficial effects of the execution method.
Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application. FIG. 14 illustrates a block diagram of an exemplary electronic device 512 suitable for use in implementing embodiments of the present application. The electronic device 512 shown in fig. 14 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 14, the electronic device 512 may include: one or more processors 516; the memory 528 is configured to store one or more programs, and when the one or more programs are executed by the one or more processors 516, the one or more processors 516 implement the image capturing method provided in the embodiment of the present application, including:
determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction;
and determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
Components of the electronic device 512 may include, but are not limited to: one or more processors 516, a memory 528, and a bus 518 that connects the various device components, including the memory 528 and the processors 516.
The electronic device 512 typically includes a variety of computer device-readable storage media. These storage media may be any available storage media that can be accessed by electronic device 512 and includes both volatile and nonvolatile storage media, removable and non-removable storage media.
The memory 528 may include computer device readable storage media in the form of volatile memory, such as Random Access Memory (RAM) 530 and/or cache memory 532. The electronic device 512 may further include other removable/non-removable, volatile/nonvolatile computer device storage media. By way of example only, storage system 534 may be used to read from and write to non-removable, nonvolatile magnetic storage media (not shown in FIG. 14, commonly referred to as a "hard drive"). Although not shown in FIG. 14, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical storage medium) may be provided. In such cases, each drive may be connected to bus 518 through one or more data storage media interfaces. Memory 528 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the application.
A program/utility 540 having a set (at least one) of program modules 542 may be stored, for example, in memory 528, such program modules 542 including, but not limited to, an operating device, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may include an implementation of a network environment. The program modules 542 generally perform the functions and/or methods of the embodiments described herein.
The electronic device 512 may also communicate with one or more external devices 514 and/or a display 524, with one or more devices that enable a user to interact with the electronic device 512, and/or with any devices (e.g., network cards, modems, etc.) that enable the electronic device 512 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interfaces 522. Also, the electronic device 512 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 520. As shown in FIG. 14, the network adapter 520 communicates with the other modules of the electronic device 512 via the bus 518. It should be appreciated that although not shown in FIG. 14, other hardware and/or software modules may be used in conjunction with the electronic device 512, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID devices, tape drives, and data backup storage devices, among others.
The one or more processors 516 may execute various functional applications and data processing by executing at least one of other programs stored in the memory 528, for example, to implement an image capturing method provided by the embodiments of the present application.
One embodiment of the present application provides a storage medium containing computer-executable instructions that when executed by a computer processor perform an image acquisition method, comprising:
determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction;
and determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire the image of the display screen at the new acquisition scanning frequency.
The computer storage media of the embodiments of the present application may take any combination of one or more computer-readable storage media. The computer readable storage medium may be a computer readable signal storage medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor device, apparatus, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In embodiments of the present application, a computer readable storage medium may be any tangible storage medium that can contain, or store a program for use by or in connection with an instruction execution apparatus, device, or apparatus.
A computer readable signal storage medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal storage medium may also be any computer readable storage medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution apparatus, device, or apparatus.
Program code embodied on a computer readable storage medium may be transmitted using any appropriate storage medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or device. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (9)
1. An image acquisition method, characterized in that the method comprises:
determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer and the resolution of the image acquirer in the second direction;
determining a new acquisition scanning frequency according to the display scanning frequency, and controlling the image acquisition device to acquire images on the display screen at the new acquisition scanning frequency;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer, and the resolution of the image acquirer in the second direction, including:
according to the first length, the length of the display screen in the first direction and the display scanning frequency of the display screen, representing the first time required by the display screen to scan and display the stripes;
determining a second time required by the image collector to scan and collect the stripes according to the second length, the collection scanning frequency of the image collector and the resolution of the image collector in a second direction;
determining the display scan frequency from the first time and the second time of the representation;
the first time is denoted t 1: t1= (LNumt/LNum)/Freq; the display screen comprises a display screen, wherein LNumt is a first length, LNum is the length of the display screen in a first direction, and Freq is the display scanning frequency of the display screen;
the second time is denoted by t 2: t2= (HNumt/D)/Freqsen, wherein HNumt is the second length, D is the resolution of the image collector in the second direction, and Freqsen is the collection scanning frequency of the image collector;
said determining the display scan frequency from the first time and the second time of the representation comprises: let t1= t2, i.e. (HNumt/D)/Freqsen = (LNumt/LNum)/Freq, from which Freq is solved.
2. The method of claim 1, wherein determining the display scan frequency from the first time and the second time of the representation comprises:
establishing an equality relationship between the first time and the second time represented;
the display scan frequency in the equality is solved.
3. The method of claim 1, wherein determining a new acquisition scan frequency from the display scan frequency comprises:
determining a display scanning period of the display screen according to the display scanning frequency;
determining a target acquisition scanning period of the image acquisition device according to the candidate acquisition scanning period which is greater than or equal to the display scanning period;
and determining the new acquisition scanning frequency of the image acquisition device according to the target acquisition scanning period.
4. The method of claim 1, wherein the determining of the fringe image comprises:
controlling an image collector to collect images of the display at a preset image collection frame rate;
when an image of a preset frame is collected in the image collection process, controlling an image collector to collect the image at a preset exposure to obtain the stripe image;
the preset exposure is smaller than the exposure when other frame images except the preset frame are acquired.
5. The method of claim 1, wherein determining a first length of any stripe in the stripe image in a first direction and a second length in a second direction comprises:
determining a first length of the stripe in a first direction according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image;
and determining a second length of the stripe in the second direction according to the pixel coordinate of the endpoint of the stripe and the deviation angle of the stripe and the second direction.
6. The method of claim 5, wherein determining the deviation angle of the fringes from the second direction comprises:
determining an included angle between the stripe and the edge of the stripe image according to the pixel coordinate of the endpoint of the stripe and the pixel coordinate of the vertex of the stripe image;
and determining the deviation angle between the stripe and the second direction according to the included angle and the deviation angle between the edge of the stripe image and the second direction.
7. An image acquisition apparatus, characterized in that the apparatus comprises:
the length determining module is used for determining a first length of any stripe in the stripe image in a first direction and a second length of any stripe in a second direction; the fringe image is obtained by an image collector for collecting images of a display screen, the first direction is the display scanning direction of the display screen, and the second direction is the collecting scanning direction of the image collector;
a display scanning frequency determining module, configured to determine a display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer, and the resolution of the image acquirer in the second direction;
the acquisition module is used for determining a new acquisition scanning frequency according to the display scanning frequency and controlling the image acquisition device to acquire images on the display screen at the new acquisition scanning frequency;
determining the display scanning frequency of the display screen according to the first length, the second length, the length of the display screen in the first direction, the acquisition scanning frequency of the image acquirer, and the resolution of the image acquirer in the second direction, including:
according to the first length, the length of the display screen in the first direction and the display scanning frequency of the display screen, representing the first time required by the display screen to scan and display the stripes;
determining a second time required by the image collector to scan and collect the stripes according to the second length, the collection scanning frequency of the image collector and the resolution of the image collector in a second direction;
determining the display scan frequency from the first time and the second time of the representation;
the first time is denoted t 1: t1= (LNumt/LNum)/Freq; the display screen comprises a display screen, wherein LNumt is a first length, LNum is the length of the display screen in a first direction, and Freq is the display scanning frequency of the display screen;
the second time is denoted by t 2: t2= (HNumt/D)/Freqsen, wherein HNumt is the second length, D is the resolution of the image collector in the second direction, and Freqsen is the collection scanning frequency of the image collector;
said determining the display scan frequency from the first time and the second time of the representation comprises: let t1= t2, i.e. (HNumt/D)/Freqsen = (LNumt/LNum)/Freq, from which Freq is solved.
8. An electronic device, characterized in that the electronic device comprises:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the image acquisition method of any one of claims 1-6.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the image acquisition method according to any one of claims 1 to 6.
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