CN115706751B - Image acquisition method, device, electronic equipment and storage medium - Google Patents
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Abstract
The disclosure relates to an image acquisition method, an image acquisition device, an electronic device and a storage medium, wherein the image acquisition method comprises the following steps: acquiring detected light spot parameters when the electronic equipment supplements light to an image to be acquired through a screen; and if the detected light spot parameters do not meet the specified conditions, adjusting the actual light spot parameters of the light supplementing of the image to be acquired by the electronic equipment through a screen, so as to acquire the image to be acquired through the under-screen sensing system when the detected light spot parameters meet the specified conditions. The method and the device can ensure that the acquired image has better image quality.
Description
Technical Field
The disclosure relates to the field of liquid crystal display, and in particular relates to an image acquisition method, an image acquisition device, electronic equipment and a storage medium.
Background
In the related art, an off-screen sensing system may illuminate a finger fingerprint by illuminating a spot on a screen of an electronic device, and then collect light reflected by the finger fingerprint by an optical fingerprint sensor of the off-screen sensing system to form a fingerprint image.
In the process of collecting the fingerprint image, the optical fingerprint sensor can adjust the gain value of the optical fingerprint sensor on the image so as to ensure the fixed incident light quantity per unit area, for example, when the brightness of a light source is insufficient, the gain can be improved, and when the brightness is too high, the gain can be reduced, thereby meeting the collection requirement of the fingerprint image.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides an image acquisition method, an image acquisition device, an electronic device, and a storage medium.
According to a first aspect of embodiments of the present disclosure, an off-screen sensing system applied to an electronic device is provided, the electronic device supplements light to an image to be acquired through a screen in a process of acquiring the image, and the off-screen sensing system adjusts a gain along with a light supplementing parameter; the image acquisition method comprises the following steps:
Acquiring detected light spot parameters when the electronic equipment supplements light to an image to be acquired through a screen;
If the detected light spot parameters do not meet the specified conditions, the electronic equipment adjusts the actual light spot parameters of the light supplementing of the image to be acquired through the screen, so that the image to be acquired is acquired through the under-screen sensing system when the detected light spot parameters meet the specified conditions.
Optionally, the detecting the spot parameter includes a brightness parameter, and the method further includes:
if the brightness parameter is not in the appointed brightness range, determining that the detected light spot parameter does not meet the appointed condition; and/or the number of the groups of groups,
The detection spot parameter comprises a luminance uniformity value, the method further comprising:
If the brightness uniformity value is not in the specified uniformity value range, determining that the detected light spot parameter does not meet the specified bar; and/or the number of the groups of groups,
The detection spot parameter comprises an optical three primary color pixel ratio, the method further comprising:
if the ratio of the optical three primary color pixels is not within the specified ratio range, it is determined that the detection spot parameter does not satisfy the specified condition.
Optionally, the luminance parameter comprises a minimum luminance value, and the method further comprises: if the minimum luminance value is below the luminance threshold, it is determined that the luminance parameter is not within the specified luminance range.
Optionally, the actual light spot parameters include an actual brightness uniformity value, an actual brightness parameter, and an actual optical three-primary-color pixel proportion, and if the detected light spot parameters do not meet the specified conditions, the adjusting the actual light spot parameters of the electronic device for supplementing light to the image to be acquired through the screen includes:
If the brightness parameter in the detected facula parameters does not meet the specified condition, the electronic equipment adjusts at least one parameter of the actual brightness uniformity value, the actual brightness parameter and the actual optical three primary color pixel proportion of the light supplementing of the image to be acquired through the screen.
Optionally, the method further comprises:
If the detected light spot parameters meet the specified conditions, determining whether the gain of the under-screen sensing system is zero;
Under the condition that the gain of the under-screen sensing system is not zero, adjusting the light supplementing parameter of the under-screen sensing system to enable the gain of the under-screen sensing system to be zero;
and acquiring an image to be acquired through an under-screen sensing system.
According to a second aspect of embodiments of the present disclosure, there is provided an electronic device including an under-screen sensing system and a spot parameter detection system;
the light spot parameter detection system is used for detecting light spots of light supplement when the electronic equipment supplements light to the image to be acquired through the screen, so as to obtain detected light spot parameters;
The under-screen sensing system is configured to perform the image acquisition method provided in the first aspect.
Optionally, the spot parameter detection system includes a spot parameter detector; the spot parameter detector is arranged at the edge of an off-screen sensor in the off-screen sensing system for capturing images.
Optionally, the number of spot parameter detectors is plural, and the plural spot parameter detectors are centrosymmetric with respect to a center of the off-screen sensor.
According to a third aspect of embodiments of the present disclosure, an image acquisition device is provided, which is applied to an under-screen sensing system in an electronic device, the under-screen sensing system supplements light for an image to be acquired through a screen in the process of acquiring the image, and the under-screen sensing system adjusts a gain along with a light supplementing parameter; the image acquisition device includes:
the detection light spot parameter acquisition module is configured to acquire detection light spot parameters detected when the electronic equipment supplements light to the image to be acquired through the screen;
The acquisition module is configured to adjust the actual light spot parameters of the electronic equipment for supplementing light to the image to be acquired through the screen when the detected light spot parameters do not meet the specified conditions, so as to acquire the image to be acquired through the under-screen sensing system when the detected light spot parameters meet the specified conditions.
Optionally, the detected flare parameter includes a brightness parameter, a brightness uniformity value, and an optical three primary color pixel proportion, and the image acquisition device further includes:
and the first condition judging module is configured to determine that the detected light spot parameter does not meet the specified condition when the brightness parameter is not in the specified brightness range.
A second condition determination module configured to determine that the detected spot parameter does not satisfy the specified condition when the luminance uniformity value is not within the specified uniformity value range;
a third condition determination module configured to determine that the detected spot parameter does not satisfy the specified condition when the optical three-primary color pixel ratio is not within the specified ratio range;
Optionally, the luminance parameter includes a minimum luminance value, and the first condition determination module is configured to: when the minimum luminance value is below the luminance threshold, it is determined that the luminance parameter is not within the specified luminance range.
Optionally, the actual light spot parameter includes an actual brightness uniformity value, an actual brightness parameter, and an actual optical three primary color pixel proportion, and the acquisition module includes:
The adjustment sub-module is configured to adjust at least one parameter of an actual brightness uniform value, an actual brightness parameter and an actual optical three-primary-color pixel proportion of the image to be acquired by the electronic equipment through the screen when the brightness parameter in the detected facula parameter does not meet the specified condition.
Optionally, the acquisition module includes:
The gain determining submodule is configured to determine whether the gain of the on-screen sensing system is zero when the detected light spot parameter meets the specified condition;
The light supplementing parameter adjusting sub-module is configured to adjust the light supplementing parameter of the under-screen sensing system under the condition that the gain of the under-screen sensing system is not zero so that the gain of the under-screen sensing system is zero;
and the acquisition sub-module is configured to acquire an image to be acquired through the off-screen sensing system.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the image acquisition method provided by the first aspect of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: when the electronic equipment supplements light to the image to be acquired through the screen, the detected detection light spot parameters are obtained, and when the detection light spot parameters do not meet the specified conditions, the electronic equipment adjusts the actual light spot parameters for supplementing light to the image to be acquired through the screen, so that when the detected detection light spot parameters meet the specified conditions, the image to be acquired is acquired through the under-screen sensing system. When the detection facula parameters meet the specified conditions, the detection facula parameters are indicated to stably meet the image acquisition requirements of the on-screen sensor system, so that the image does not need to be gained when the adjusted image to be acquired is acquired through the on-screen sensor system, the image noise is also gained while the on-screen sensor system is prevented from being gained, the image quality is influenced, and the acquired image is ensured to have better image quality.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic view of an application environment of an image acquisition method according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating an architecture of an off-screen sensing system, according to an example embodiment.
Fig. 3 is a schematic diagram of a distribution of spot parameter detectors according to an exemplary embodiment.
Fig. 4 is a flowchart illustrating an image acquisition method according to an exemplary embodiment.
Fig. 5 is a flowchart illustrating an image acquisition method according to another exemplary embodiment.
Fig. 6 is a block diagram illustrating an image acquisition apparatus according to an exemplary embodiment.
Fig. 7 is a block diagram of an electronic device, according to an example embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
With the continuous development of fingerprint verification technology, more and more electronic devices can be unlocked through fingerprints, and usually an under-screen sensing system configured in the electronic device can collect fingerprints of users and verify the fingerprints of the users, and after the fingerprints pass verification, unlocking is completed, so that the users are allowed to operate the electronic device, the electronic device is prevented from being operated by strangers, and the safety of the electronic device is ensured. Therefore, the fingerprint unlocking technology is popular with users because of good convenience and safety.
In the fingerprint unlocking process, the step of collecting the fingerprint image by the optical fingerprint sensor is extremely important, and whether the fingerprint unlocking can be normally performed is directly determined by the quality of the fingerprint image.
In the related art, an off-screen sensing system of an electronic device may illuminate a finger fingerprint by lighting a spot on a screen, and then collect light reflected from the finger fingerprint by an optical fingerprint sensor of the off-screen sensing system to form a fingerprint image. When the optical fingerprint sensor collects fingerprint images, gain control can be automatically performed, that is, when the brightness of a light source is insufficient, the optical fingerprint sensor can improve the brightness gain so as to complement the brightness, and when the brightness is too high, the brightness gain is reduced, so that the sensitization amount of a unit area is kept within a certain range, and overexposure or underexposure is prevented, and the fingerprint image quality is influenced.
However, in practical applications, the detected spot parameters (such as brightness) of the detected spots may be changed due to factors such as screen wear and ambient light, so that the gain of the optical fingerprint sensor may be dynamically changed, and when the gain of the optical fingerprint sensor is increased, the noise signal of the image may be amplified, thereby affecting the quality of the fingerprint image.
In view of this, the disclosure provides an image acquisition method, an apparatus, an electronic device, and a storage medium, which can omit gain of an image to be acquired in the process of acquiring the image by an on-screen sensing system, thereby avoiding the situation that noise signals of the image are amplified due to image gain, and improving the quality of the acquired image.
The following describes an application environment of an image capturing method, as shown in fig. 1, where the image capturing method may be applied to an electronic device 100, and in particular, the electronic device 100 may be a smart phone. For example, taking the electronic device 100 as a smart phone and the image to be acquired as a fingerprint image, the electronic device 110 may include an off-screen sensing system 110 and a spot parameter detection system (not shown in fig. 1). In the process of capturing an image, the electronic device may perform light filling on an image to be captured through the screen by the under-screen sensing system 110, and the under-screen sensing system adjusts the gain along with the light filling parameter. Alternatively, the off-screen sensing system may comprise hardware such as an off-screen sensor and related algorithms, including, for example, a fingerprint sensor, a processor (e.g., an IC chip), and some logic algorithms in the IC chip, or when the logic algorithms are in the fingerprint sensor, the off-screen sensing system may include only the fingerprint sensor, wherein the fingerprint sensor is an optical fingerprint sensor.
Illustratively, as shown in FIG. 2, the off-screen sensing system 110 may include: the light source device 113, the optical fingerprint sensor 114, the CG glass 111, the OLED screen 112 and the fingerprint module reinforcing steel sheet 115; the spot parameter detection system may comprise a spot parameter detector 130. Wherein, CG glass 111 may be disposed on an upper layer of OLED screen 112, CG glass 111 being for contact with a user's finger. The light source device 113 may be built in the OLED screen 112, the light source device 113 being configured to form a spot on a screen of the electronic apparatus to shine a finger touching the screen. The optical fingerprint sensor 114 may be disposed on the reinforced steel sheet 115 of the fingerprint module, and the optical fingerprint sensor 114 is used for receiving light reflected by a finger to form a fingerprint image. The fingerprint module reinforcing steel sheet 115 can be fixed on the whole machine middle frame 120 of the electronic equipment. The spot parameter detector 130 may also be disposed on the fingerprint module reinforcing steel sheet 115 and located at the edge of the optical fingerprint sensor 114, where the spot parameter detector 130 may be configured to detect a spot parameter of a spot, and optionally, the spot parameter may include, but is not limited to, a brightness parameter, a brightness uniformity value, an optical trichromatic pixel ratio, and the like.
Alternatively, the number of spot parameter detectors 130 may be plural, and the plurality of spot parameter detectors 130 may be uniformly distributed on the edge of the optical fingerprint sensor 114 to better detect the brightness uniformity of the spot. As shown in fig. 3, when the number of the spot parameter detectors 130 is two, the two spot parameter detectors 130 may be disposed on the fingerprint module reinforcing steel sheet 115, and the two spot parameter detectors 130 may be centrally symmetrical with respect to the optical fingerprint sensor 114. The spot parameter detector 130 may be a photodetector (photosensitive PD), among others.
The area of the under-screen sensing system 110 corresponding to the screen of the electronic device 100 may be referred to as a fingerprint acquisition area.
Fig. 4 is a flowchart illustrating an image acquisition method, as shown in fig. 4, for use in the off-screen sensing system 110, as shown in fig. 1, according to an exemplary embodiment, the method may include the steps of:
In step S101, the detected light spot parameter is obtained when the electronic device supplements light to the image to be collected through the screen.
By way of example, taking a user performing fingerprint unlocking on an electronic device, when the electronic device detects that a finger of the user presses a fingerprint acquisition area, it may be determined that the user needs to perform fingerprint unlocking, and thus may enter a fingerprint image acquisition process. In the fingerprint image acquisition process, the electronic equipment can carry out light filling on an image to be acquired through a screen, specifically, an under-screen sensing system in the electronic equipment can control a light source device to emit light, the light source device emits light to form light spots on the screen of the electronic equipment, and light of the light spots irradiates on fingers of a user, so that the fingerprint image on the fingers of the user is subjected to light filling. After light filling, the under-screen sensing system can receive the detected light spot parameters detected by the light spot parameter detection system, so that the detected light spot parameters are obtained.
In step S102, if the detected spot parameter does not meet the specified condition, the electronic device adjusts the actual spot parameter of the light supplementing of the image to be acquired through the screen, so as to acquire the image to be acquired through the under-screen sensing system when the detected spot parameter meets the specified condition.
The specified conditions are used for judging whether the parameters of the detected light spots meet the requirements when the optical fingerprint sensor in the under-screen sensing system collects fingerprint images. For example, an optical fingerprint sensor must be required to collect a fingerprint image while keeping the amount of light entering per unit area within a certain range.
The image to be acquired is understood to be an assembly in which the user's finger is continuously pressed to form an image on the screen, and is not understood to be an image at the same time as the previous image to be acquired.
In some embodiments, the off-screen sensing system may compare the detected spot parameter detected by the spot parameter detecting system with the specified spot parameter range, and if the spot parameter is within the specified spot parameter range, it indicates that the currently collected spot parameter meets a requirement when the optical fingerprint sensor collects a fingerprint image, and may determine that the spot parameter meets a specified condition. If the spot parameters are not in the specified spot parameter range, the spot parameters which are currently collected do not meet the requirements of the optical fingerprint sensor when collecting fingerprint images, and the spot parameters can be determined to not meet the specified conditions.
When the detection light spot parameters do not meet the specified conditions, the under-screen sensing system can adjust actual light spot parameters of the electronic equipment for supplementing light to the image to be acquired through the screen, and particularly, the under-screen sensing system can adjust the actual light spot parameters of the light spots by adjusting working parameters of the light source device. For example, the electronic device may increase the operating power of the light source arrangement to increase the actual brightness parameter of the spot, thereby adjusting the actual spot parameter. After the actual light spot parameters are adjusted, if the detected light spot parameters meet the specified conditions, acquiring the acquired images through an under-screen sensing system.
It will be appreciated that the actual spot parameter refers to the parameter of the spot itself, which is not affected by the external environment, and the detected spot parameter may be the spot parameter affected by the external environment (such as ambient light, shielding of a worn screen, etc.), and thus the actual spot parameter and the detected spot parameter may be different, but when the actual spot parameter is changed, the detected spot parameter is also changed accordingly.
Optionally, the specified spot parameter range may be stored in a local memory of the electronic device in advance, or may be stored in a cloud server that establishes a communication link with the electronic device, and when the electronic device needs, the specified spot parameter range may be called to the cloud server.
In this embodiment, when the electronic device supplements light to the image to be acquired through the screen, the detected detection light spot parameter is obtained, and when the detection light spot parameter does not meet the specified condition, the electronic device adjusts the actual light spot parameter of the image to be acquired through the screen, so that when the detected detection light spot parameter meets the specified condition, the image to be acquired is acquired through the under-screen sensing system. When the detection facula parameters meet the specified conditions, the detection facula parameters are indicated to stably meet the image acquisition requirements of the on-screen sensor system, so that the image does not need to be gained when the adjusted image to be acquired is acquired through the on-screen sensor system, the image noise is also gained while the on-screen sensor system is prevented from being gained, the image quality is influenced, and the acquired image is ensured to have better image quality.
It can be appreciated that the image capturing method in this embodiment is not limited to the field of capturing fingerprint images, that is, is not limited to the field of optical fingerprint sensors, but can also be applied to other fields of devices that require screen light filling and gain variation.
Fig. 5 is a flowchart illustrating an image acquisition method, as shown in fig. 5, for use in the off-screen sensing system 110, as shown in fig. 1, according to another exemplary embodiment, the method may include the steps of:
In step S201, the detected light spot parameter is obtained when the electronic device supplements light to the image to be collected through the screen.
The specific embodiment of step S201 can refer to step S101, and thus will not be described herein.
In step S202, it is determined whether the detection spot parameter satisfies a specified condition.
In some embodiments, the detecting light spot parameter includes a brightness parameter, the detecting light spot parameter includes a brightness uniformity value, and an optical three primary color pixel ratio, and the specific embodiment of step S202 may include: if the brightness parameter is not in the appointed brightness range, determining that the detected light spot parameter does not meet the appointed condition; and/or if the brightness uniformity value is not within the specified uniformity value range, determining that the detected light spot parameter does not meet the specified bar; and/or if the proportion of the optical three primary color pixels is not in the specified proportion range, determining that the detection light spot parameter does not meet the specified condition.
As an example, for example, a luminance range is specified to be greater than or equal to the luminance parameter a1 and less than or equal to the luminance parameter a2. When the under-screen sensing system detects that the currently acquired brightness parameter a is larger than the brightness value a, the detection light spot parameter can be determined to not meet the specified condition.
As one approach, the luminance parameter may include a minimum luminance value, and if the minimum luminance value is below a luminance threshold, it is determined that the luminance parameter is not within a specified luminance range.
For example, the under-screen sensing system may compare the minimum brightness value detected in the different areas of the spot with a brightness threshold, where the brightness threshold is a preset lower limit of the brightness parameter, for example, the brightness parameter lower limit is a1, the minimum brightness value is a min, and if a min is lower than a1, it may be determined directly that the brightness parameter is not in the specified brightness range, so as to determine quickly and effectively whether the brightness parameter is in the specified brightness range.
Optionally, the under-screen sensing system may compare the maximum brightness value detected in different areas of the spot with the upper limit of the brightness parameter, for example, the upper limit of the brightness parameter is a2, the minimum brightness value is a max, and if a max is greater than a2, it may be directly determined that the brightness parameter is not in the specified brightness range, so as to quickly and effectively determine whether the brightness parameter is in the specified brightness range.
Alternatively, the luminance parameter may include a luminance average value, which is an average value of luminance parameters corresponding to different areas of the flare, and if the on-screen sensing system detects that the luminance average value is not in the specified luminance average value range, it is determined that the luminance parameter is not in the specified luminance range.
For example, if the on-screen sensing system detects that the average brightness value is within the specified average brightness value range, and the maximum brightness value is less than or equal to the upper limit of the brightness parameter, and the minimum brightness value is greater than or equal to the lower limit of the brightness parameter, it may be determined that the brightness parameter is within the specified brightness range, so that the brightness parameter of the light spot may be ensured to meet the requirement of the optical fingerprint sensor as a whole.
As another example, specifying a spot parameter range further includes specifying a uniformity value range, wherein the brightness uniformity value characterizes the uniformity of brightness.
When the under-screen sensing system detects that the brightness uniformity value is not in the specified uniformity value range, the uniformity degree of the light spots is poor, and the image acquisition requirement of the optical fingerprint sensor is not met, so that the condition that the parameters of the detected light spots do not meet the specified conditions can be determined.
As yet another example, the specified spot parameter range further includes a specified ratio range, where the ratio of the pixels of the three primary colors is also called RGB pixel color parameter, specifically, the ratio of the pixels of three colors of red, green, and blue (R, G, B), which can reflect the color condition of the image, and different colors are generated when the ratio of the three pixels of RGB is different.
For example, when the off-screen sensing system detects that the proportion of the pixels of the optical three primary colors is not in the specified proportion range, the color of the light spot is indicated to not meet the image acquisition requirement of the optical fingerprint sensor, so that the parameter of the detected light spot can be determined to not meet the specified condition.
In some embodiments, when the under-screen sensing system detects that one or more parameters of the brightness parameter, the brightness uniformity value, and the optical three-primary-color pixel proportion meet the corresponding conditions, it may be determined that the detected light spot parameter meets the specified conditions, and specifically, which parameters are selected for performing the condition judgment may be set according to the actual requirements, which is not limited herein. As an example, when the under-screen sensing system detects that the brightness parameter of the light spot is within the specified brightness range, the brightness uniformity value is within the specified uniformity value range, and the proportion of the optical three primary color pixels is within the specified proportion range, it can be determined that the detected light spot parameter of the light spot meets the specified condition, so that the light spot meeting the specified condition can be ensured, the requirements of the optical fingerprint sensor on three aspects of brightness, brightness uniformity and color are met, and further, the fingerprint image collected by the optical fingerprint sensor under the light spot is ensured to have better image quality.
In step S203, if the detected light spot parameter does not meet the specified condition, the electronic device adjusts the actual light spot parameter of the light supplementing of the image to be acquired through the screen, so as to acquire the image to be acquired through the under-screen sensing system when the detected light spot parameter meets the specified condition.
In some embodiments, the specific implementation of step S203 may include: if the brightness parameter in the detected facula parameters does not meet the specified condition, the electronic equipment adjusts at least one parameter of the actual brightness uniformity value, the actual brightness parameter and the actual optical three primary color pixel proportion of the light supplementing of the image to be acquired through the screen.
For example, if the luminance parameter in the detected spot parameters does not meet a specified condition, e.g., the detected spot parameter is below a luminance parameter threshold, the detected spot parameter may be adjusted by increasing the actual luminance parameter. The brightness parameter in the detected light spot parameter can meet the appointed condition by matching the actual brightness uniformity value and the actual optical three primary color pixel proportion. In some scenes, for example, even if the actual brightness parameter is adjusted to the maximum, the brightness parameter in the detected flare parameter does not meet the specified condition, the effect of improving the brightness parameter in the detected flare can be achieved by adjusting the actual optical three primary color pixel ratio, and then the brightness parameter in the detected flare parameter meets the specified condition.
Similarly, if the actual brightness uniformity value or the actual optical three-primary-color pixel in the spot parameter is detected and the specified condition is not met, the electronic equipment can adjust at least one parameter of the actual brightness uniformity value, the actual brightness parameter and the actual optical three-primary-color pixel proportion of the image to be acquired through the screen, so that the adjustment flexibility is improved.
In step S204, if the detected spot parameter satisfies a specified condition, it is determined whether the gain of the on-screen sensing system is zero.
The gain of the off-screen sensing system may refer to an image gain value of the optical fingerprint sensor.
For example, when the on-screen sensing system detects that the detected light spot parameter meets the specified condition, whether the image gain value of the optical fingerprint sensor is zero can be further detected, and when the detected light spot parameter meets the specified condition, it is indicated that the detected light spot parameter meets the requirement of the optical fingerprint sensor, and gain is not needed, and at this time, the image quality is affected by gain of the fingerprint image through the image gain value of the optical fingerprint sensor. For example, if the detected spot parameter satisfies a specified condition, if the image gain value (e.g., brightness gain value) of the optical fingerprint sensor is greater than zero, the fingerprint image collected by the optical fingerprint sensor is over-exposed. If the image gain value (e.g., brightness gain value) of the optical fingerprint sensor is less than zero, the image of the fingerprint captured by the optical fingerprint sensor is underexposed.
In step S205, in the case where the gain of the off-screen sensing system is not zero, the light supplementing parameter of the off-screen sensing system is adjusted so that the gain of the off-screen sensing system is zero.
For example, if the off-screen sensing system detects that the image gain value of the optical fingerprint sensor is greater than zero, the image gain value of the optical fingerprint sensor may be reduced to zero. If the under-screen sensing system detects that the image gain value of the optical fingerprint sensor is smaller than zero, the image gain value of the optical fingerprint sensor can be improved, so that the image gain value of the optical fingerprint sensor is adjusted to zero.
Optionally, the under-screen sensing system may adjust the image gain value of the optical fingerprint sensor according to the collected fingerprint image and the current collected detection spot parameter of the optical fingerprint sensor, for example, the luminance parameter of the collected detection fingerprint image is b1, the luminance parameter of the current collected detection spot parameter is b2, and if b 2-b1=x, and x is greater than 0, the luminance gain value in the image gain value of the optical fingerprint sensor may be increased by x. If b 2-b1=x, and x is smaller than 0, the luminance gain value in the image gain value of the optical fingerprint sensor may be reduced by x. If b 2-b1=x, and x is equal to 0, the image gain value of the optical fingerprint sensor is maintained.
It can be understood that after the image gain value is set, the optical fingerprint sensor automatically performs gain on the collected fingerprint image according to the set image gain value while collecting the fingerprint image, that is, the fingerprint image collected by the optical fingerprint sensor is the fingerprint image obtained after the gain.
In step S206, an image to be acquired is acquired by an under-screen sensing system.
In this embodiment, if the detected light spot parameter meets the specified condition, it is determined whether the gain of the under-screen sensing system is zero, and if the gain of the under-screen sensing system is not zero, the light supplementing parameter of the under-screen sensing system is adjusted so that the gain of the under-screen sensing system is zero, and finally, the image to be acquired is acquired by the under-screen sensing system. Therefore, the under-screen sensing system can be ensured to obtain the image to be acquired under the condition that the image is not subjected to gain, the condition that noise signals of the image to be acquired are amplified is avoided, and better image quality can be ensured.
In addition, when the detected light spot parameters meet preset conditions, the under-screen sensing system can directly determine whether the fingerprint image acquired by the optical fingerprint sensor is overexposed or underexposed through whether the image gain value of the optical fingerprint sensor is larger than zero or smaller than zero. In comparison with the related art, when judging the exposure degree of the fingerprint image, a plurality of fingerprint images need to be acquired, and the exposure degree is determined by comparing the gray scale, brightness and adjacent front and rear picture differences of the plurality of fingerprint images. Not only avoiding the need of continuously collecting pictures within a certain time, but also increasing unnecessary time; the consumption of CPU hardware resources by comparing picture data is avoided, and the system power consumption is increased; and the condition that exposure abnormality can not be judged by comparing differences among pictures is avoided due to continuous pictures acquired in a specified time. Therefore, the detection efficiency and accuracy of the picture exposure condition are improved.
In some embodiments, the off-screen sensing system may start timing when the detected spot parameter meets the specified condition, and may control the optical fingerprint sensor to capture a fingerprint image under the spot if the detected spot parameter always meets the specified condition for a specified period of time. If the detected light spot parameters fluctuate, the specified conditions are not always met within the specified time length, and the optical fingerprint sensor is not started.
In the embodiment, the optical fingerprint sensor is controlled to collect the fingerprint image under the light spot by detecting that the light spot parameter always meets the specified condition in the specified duration, so that the optical fingerprint sensor can collect the fingerprint image under the condition that the light spot has good stability, and the quality of the collected fingerprint image is further improved.
In some embodiments, if the electronic device is in the process of unlocking the fingerprint, fingerprint verification may be performed on the fingerprint image acquired by the optical fingerprint sensor, for example, the acquired fingerprint image is compared with a preset fingerprint image stored in the electronic device in advance, and if the acquired fingerprint image matches with the preset fingerprint image (for example, the similarity is greater than the similarity threshold), the fingerprint verification is successful, and the electronic device may be unlocked.
Fig. 6 is a block diagram of an image acquisition apparatus according to an exemplary embodiment. The under-screen sensing system 110 is applied to the electronic equipment shown in fig. 1, the electronic equipment supplements light to the image to be acquired through a screen in the process of acquiring the image, and the under-screen sensing system adjusts the gain along with the light supplementing parameters. Referring to fig. 6, the image capturing apparatus 300 includes:
The detection light spot parameter obtaining module 310 is configured to obtain a detection light spot parameter detected when the electronic device supplements light to an image to be collected through the screen.
The acquisition module 320 is configured to adjust an actual light spot parameter of the electronic device for supplementing light to an image to be acquired through the screen when the detected light spot parameter does not meet the specified condition, so as to acquire the image to be acquired through the under-screen sensing system when the detected light spot parameter meets the specified condition.
Optionally, the detected flare parameter includes a brightness parameter, a brightness uniformity value, and an optical three primary color pixel ratio, and the image capturing apparatus 300 further includes:
and the first condition judging module is configured to determine that the detected light spot parameter does not meet the specified condition when the brightness parameter is not in the specified brightness range.
And a second condition judgment module configured to determine that the detected light spot parameter does not satisfy the specified condition when the luminance uniformity value is not within the specified uniformity value range.
And a third condition judgment module configured to determine that the detection spot parameter does not satisfy the specified condition when the optical three-primary-color pixel ratio is not within the specified ratio range.
Optionally, the luminance parameter includes a minimum luminance value, and the first condition determination module is configured to: when the minimum luminance value is below the luminance threshold, it is determined that the luminance parameter is not within the specified luminance range.
Optionally, the actual light spot parameters include an actual brightness uniformity value, an actual brightness parameter, and an actual optical three primary color pixel ratio, and the acquisition module 320 includes:
The adjustment sub-module is configured to adjust at least one parameter of an actual brightness uniform value, an actual brightness parameter and an actual optical three-primary-color pixel proportion of the image to be acquired by the electronic equipment through the screen when the brightness parameter in the detected facula parameter does not meet the specified condition.
Optionally, the acquisition module 320 includes:
the gain determination submodule is configured to determine whether the gain of the on-screen sensing system is zero when the detected light spot parameter meets a specified condition.
And the light supplementing parameter adjusting sub-module is configured to adjust the light supplementing parameter of the under-screen sensing system under the condition that the gain of the under-screen sensing system is not zero so that the gain of the under-screen sensing system is zero.
And the acquisition sub-module is configured to acquire an image to be acquired through the off-screen sensing system.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the image acquisition method provided by the present disclosure.
In an exemplary embodiment, an electronic device is also provided that may include an off-screen sensing system and a spot parameter detection system.
Wherein: the light spot parameter detection system is used for detecting light spots of light supplement when the electronic equipment supplements light to the image to be acquired through the screen, and detection light spot parameters are obtained.
The under-screen sensing system is used for executing the image acquisition method provided by any embodiment.
In some embodiments, the spot parameter detection system comprises a spot parameter detector; the spot parameter detector is arranged at the edge of an off-screen sensor in the off-screen sensing system for capturing images.
In some embodiments, the number of spot parameter detectors is a plurality, the plurality of spot parameter detectors being centrally symmetric about the center of the off-screen sensor.
Fig. 7 is a block diagram of an electronic device 800 of the type shown in accordance with an exemplary embodiment. For example, the electronic device 800 may be a mobile phone, a computer, a smart door lock, a tablet device, a smart wearable device, etc.
Referring to fig. 7, an electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the electronic device 800, such as operations associated with display, data processing, data communication, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interactions between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802. The electronic device may further comprise an off-screen sensing system and a spot parameter detection system as in the above embodiments. The processor 820 may be integrated in an off-screen sensing system. The light spot parameter detection system is used for detecting light spots of light supplement when the electronic equipment supplements light to the image to be acquired through the screen, and detection light spot parameters are obtained.
The memory 804 is configured to store various types of data to support operations at the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, data specifying a range of spot parameters, specifying a range of brightness, a brightness threshold, specifying a range of uniform values, specifying a range of scale, specifying a duration, presetting a fingerprint image, and so forth. The memory 804 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power component 806 provides power to the various components of the electronic device 800. Power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for electronic device 800.
The multimedia component 808 includes a screen between the electronic device 800 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front camera and/or a rear camera. When the electronic device 800 is in an operational mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 further includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 814 includes one or more sensors for providing status assessment of various aspects of the electronic device 800. For example, the sensor assembly 814 may detect an on/off state of the electronic device 800, a relative positioning of the components, such as a display and keypad of the electronic device 800, the sensor assembly 814 may also detect a change in position of the electronic device 800 or a component of the electronic device 800, the presence or absence of a user's contact with the electronic device 800, an orientation or acceleration/deceleration of the electronic device 800, and a change in temperature of the electronic device 800. The sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor. Optionally, the sensor assembly 814 further comprises at least one optical fingerprint sensor for capturing a fingerprint image of the user and at least one distance sensor array for capturing a distance between the user's finger and the screen.
The communication component 816 is configured to facilitate communication between the electronic device 800 and other devices, either wired or wireless. The electronic device 800 may access a wireless network based on a communication standard, such as WiFi,2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component 816 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the electronic device 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 804 including instructions executable by processor 820 of electronic device 800 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
In another exemplary embodiment, a computer program product is also provided, comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the above described fingerprint unlocking method when executed by the programmable apparatus.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (14)
1. The image acquisition method is characterized by being applied to an under-screen sensing system in electronic equipment, wherein the under-screen sensing system supplements light for an image to be acquired through a screen in the process of acquiring the image, and the under-screen sensing system adjusts gain along with a light supplementing parameter; the image acquisition method comprises the following steps:
When the electronic equipment supplements light to an image to be acquired through a screen, acquiring detected light spot parameters by a light spot parameter detection system in the electronic equipment, wherein the detected light spot parameters are light spot parameters influenced by external environment, the external environment comprises at least one of shielding of ambient light and a worn screen, and the detected light spot parameters comprise at least one of brightness parameters, brightness uniformity values and optical three-primary-color pixel proportions;
If the detected light spot parameters do not meet the specified conditions, the electronic equipment adjusts the actual light spot parameters of the light supplementing of the image to be acquired through the screen, so that when the detected light spot parameters meet the specified conditions, the image to be acquired is acquired through the under-screen sensing system, the specified conditions are used for judging whether the detected light spot parameters meet the requirements of the under-screen sensing system when the optical fingerprint sensor acquires fingerprint images, and the actual light spot parameters are parameters of the light spot which is not influenced by the external environment.
2. The method according to claim 1, wherein the method further comprises:
if the brightness parameter is not in the appointed brightness range, determining that the detected light spot parameter does not meet the appointed condition; and/or the number of the groups of groups,
If the brightness uniformity value is not in the specified uniformity value range, determining that the detected light spot parameter does not meet a specified bar; and/or the number of the groups of groups,
And if the proportion of the optical three primary color pixels is not in the specified proportion range, determining that the detection light spot parameter does not meet the specified condition.
3. The method of claim 2, wherein the luminance parameter comprises a minimum luminance value, the method further comprising: if the minimum luminance value is below a luminance threshold, it is determined that the luminance parameter is not within a specified luminance range.
4. The method according to claim 2, wherein the actual light spot parameters include an actual brightness uniformity value, an actual brightness parameter, and an actual optical three primary color pixel ratio, and the adjusting the actual light spot parameters of the electronic device for supplementing light to the image to be acquired through the screen if the detected light spot parameters do not meet the specified condition includes:
And if the brightness parameter in the detected light spot parameters does not meet the specified condition, adjusting at least one parameter of the actual brightness uniform value, the actual brightness parameter and the actual optical three primary color pixel proportion of the electronic equipment for supplementing light to the image to be acquired through a screen.
5. The method according to any one of claims 1-4, further comprising:
If the detected light spot parameters meet the specified conditions, determining whether the gain of the under-screen sensing system is zero;
under the condition that the gain of the under-screen sensing system is not zero, adjusting the light supplementing parameter of the under-screen sensing system to enable the gain of the under-screen sensing system to be zero;
and acquiring the image to be acquired through the under-screen sensing system.
6. An electronic device is characterized by comprising an under-screen sensing system and a light spot parameter detection system;
The light spot parameter detection system is used for detecting light spots of light supplement when the electronic equipment supplements light to the image to be acquired through a screen, so as to obtain the detected light spot parameters;
the under-screen sensing system is adapted to perform the image acquisition method of any one of claims 1-5.
7. The electronic device of claim 6, wherein the electronic device comprises a memory device,
The light spot parameter detection system comprises a light spot parameter detector;
the spot parameter detector is arranged at the edge of an under-screen sensor used for acquiring images in the under-screen sensing system.
8. The electronic device of claim 7, wherein the number of spot parameter detectors is a plurality, the plurality of spot parameter detectors being centrally symmetric about a center of the off-screen sensor.
9. The image acquisition device is characterized by being applied to an under-screen sensing system in electronic equipment, wherein the under-screen sensing system supplements light for an image to be acquired through a screen in the process of acquiring the image, and the under-screen sensing system adjusts gain along with a light supplementing parameter; the image acquisition device includes:
the detection light spot parameter acquisition module is configured to acquire detection light spot parameters when the electronic equipment supplements light to an image to be acquired through a screen by a light spot parameter detection system in the electronic equipment, wherein the detection light spot parameters are light spot parameters influenced by external environment, the external environment comprises at least one of shielding of ambient light and a worn screen, and the detection light spot parameters comprise at least one of brightness parameters, brightness uniformity values and optical three-primary-color pixel proportions;
The acquisition module is configured to adjust the actual light spot parameters of the electronic equipment for supplementing light to the image to be acquired through the screen when the detected light spot parameters do not meet the specified conditions, so as to acquire the image to be acquired through the under-screen sensing system when the detected light spot parameters meet the specified conditions, wherein the specified conditions are used for judging whether the detected light spot parameters meet the requirements of an optical fingerprint sensor in the under-screen sensing system for acquiring fingerprint images or not, and the actual light spot parameters are parameters of the light spot without being influenced by external environment.
10. The image capturing device of claim 9, wherein the detected spot parameters include a luminance parameter, a luminance uniformity value, and an optical three primary color pixel ratio, the image capturing device further comprising:
A first condition determination module configured to determine that the detected spot parameter does not satisfy a specified condition when the luminance parameter is not within a specified luminance range;
A second condition determination module configured to determine that the detected spot parameter does not satisfy a specified condition when the luminance uniformity value is not within a specified uniformity value range;
And a third condition judgment module configured to determine that the detection spot parameter does not satisfy a specified condition when the optical three-primary-color pixel ratio is not within a specified ratio range.
11. The image acquisition apparatus of claim 10, wherein the luminance parameter comprises a minimum luminance value, and the first condition determination module is configured to: and when the minimum brightness value is lower than a brightness threshold value, determining that the brightness parameter is not in a specified brightness range.
12. The image capturing device of claim 10, wherein the actual spot parameters include an actual luminance uniformity value, an actual luminance parameter, and an actual optical three primary color pixel ratio, and wherein the capturing module comprises:
And the adjustment sub-module is configured to adjust at least one parameter of the actual brightness uniformity value, the actual brightness parameter and the actual optical three primary color pixel proportion of the image to be acquired, which is subjected to light supplementing by the electronic equipment through a screen, when the brightness parameter in the detected light spot parameter does not meet the specified condition.
13. The image acquisition apparatus according to any one of claims 9 to 12, wherein the acquisition module includes:
a gain determination submodule configured to determine whether a gain of the off-screen sensing system is zero when the detected spot parameter satisfies a specified condition;
The light supplementing parameter adjusting sub-module is configured to adjust the light supplementing parameter of the under-screen sensing system under the condition that the gain of the under-screen sensing system is not zero so that the gain of the under-screen sensing system is zero;
and the acquisition sub-module is configured to acquire the image to be acquired through the off-screen sensing system.
14. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method of any of claims 1 to 5.
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| CN112949600A (en) * | 2021-04-07 | 2021-06-11 | Oppo广东移动通信有限公司 | Method, device, terminal and storage medium for collecting fingerprint under screen |
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