CN109862259B - Image sensor synchronous configuration method and device - Google Patents
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Abstract
The embodiment of the application provides a method and a device for synchronously configuring an image sensor, wherein the method for synchronously configuring the image sensor comprises the following steps: judging whether the time sequence state of the image sensor enters a blanking area or not; if yes, acquiring a register configuration parameter required by a prestored next frame image from the image sensor drive; and configuring registers required by the next frame image in the blanking area according to the configuration parameters. According to the image sensor chip without the grouping setting function, the relevant registers are rapidly configured in the blanking area of the image sensor transmission data, all the relevant registers can be guaranteed to be effective when the next frame of image is displayed, and the technical problem of abnormal display such as inconsistent image brightness caused by the fact that a register group of the image sensor which does not support group writing cannot be synchronously effective is solved.
Description
Technical Field
The present disclosure relates to the field of image sensor configuration technologies, and in particular, to a method and an apparatus for synchronously configuring an image sensor.
Background
The image sensor can convert the light image on the light-sensitive surface into an electric signal in a corresponding proportional relation with the light image, and is widely applied to important components of a digital camera in a digital camera and other electronic optical equipment. The control of the image sensor mainly includes that a main control chip reads and writes corresponding image sensor registers through an I2C (Inter-Integrated Circuit) interface, so as to realize various configurations of the image sensor. The registers of the image sensor are generally divided into 16 bits and 8 bits, and the functions of some image sensors need to be realized together by matching a plurality of registers.
In the prior art, a main control chip of a partial image sensor supports a group writing function, namely, registers related to functions are contained in a register group, and then the functions of the registers in the register group are set to be simultaneously effective.
However, there are some image sensors at present, the main control chip does not support the group writing function, which results in registers with the same or related functions needing to be configured serially through the I2C interface, since these registers can be valid, and the serial configuration results in different register configuration completion times, which may cause the register functions not to be valid synchronously, resulting in abnormal display, which often has the phenomena of sudden and large bright-dark switching of images, or inconsistent upper and lower brightness of images.
Disclosure of Invention
The application provides a method and a device for synchronously configuring an image sensor, which are used for solving the problem of synchronous configuration of a plurality of registers of the image sensor.
In a first aspect, the present application provides a method for synchronously configuring an image sensor, the method including:
judging whether the time sequence state of the image sensor enters a blanking area or not;
if yes, acquiring a register configuration parameter required by a prestored next frame image from the image sensor drive;
and configuring registers required by the next frame image in the blanking area according to the configuration parameters.
Optionally, the determining whether the timing state of the image sensor enters a blanking region includes: and judging whether the image sensor finishes transmitting the data of the current frame image.
Optionally, the determining whether the image sensor has finished transmitting the data of the current frame image includes:
monitoring the level state of a vertical synchronous signal of the image sensor in real time;
judging whether the image sensor generates a last pixel interrupt signal or not according to the change from the high level to the low level of the level state;
and judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
Optionally, the acquiring, from the image sensor driver, register configuration parameters required for a pre-stored next frame image includes:
starting a callback function according to the last pixel interrupt signal;
starting an image sensor configuration task according to the callback function;
and acquiring a register configuration parameter required by a prestored next frame image from an image sensor drive according to the image sensor configuration task.
Optionally, the configuring, in the blanking area, registers required for the next frame of image according to the configuration parameters includes:
sending the configuration parameters to a main control chip of the image sensor through an I2C driver;
and the main control chip configures registers required by the next frame of image in the blanking area according to the configuration parameters.
Optionally, the determining whether the timing state of the image sensor enters a blanking region further includes: and storing the register configuration parameters required by each frame of image to the image sensor driver.
In a second aspect, the present application provides an image sensor synchronization configuration apparatus, comprising: a blanking region judging module, a register configuration parameter acquiring module and a register configuration module, wherein,
the blanking area judging module is used for judging whether the time sequence state of the image sensor enters a blanking area or not;
the register configuration parameter acquisition module is connected with the blanking area judgment module and used for acquiring pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to whether the time sequence state of the image sensor enters the blanking area;
the register configuration module is connected with the register configuration parameter acquisition module and is used for configuring the registers required by the next frame image in the blanking area according to the configuration parameters.
Optionally, the blanking region determining module includes a vertical synchronization signal monitoring unit, a last pixel interrupt signal monitoring unit, and an output unit, wherein,
the vertical synchronizing signal monitoring unit is used for monitoring the level state of the vertical synchronizing signal of the image sensor in real time;
the last pixel interrupt signal monitoring unit is connected with the vertical synchronous signal monitoring unit and used for judging whether the image sensor generates a last pixel interrupt signal or not according to the change from high level to low level of the level state;
the output unit is connected with the last pixel interrupt signal monitoring unit and used for judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
Optionally, the register configuration parameter obtaining module includes a callback function unit, an image sensor configuration task unit, and a configuration parameter obtaining unit, wherein,
the callback function unit is used for starting a callback function according to the last pixel interrupt signal;
the image sensor configuration task unit is connected with the callback function unit and used for starting an image sensor configuration task according to the callback function;
the configuration parameter acquiring unit is connected with the image sensor configuration task unit and used for acquiring pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to the image sensor configuration task.
Optionally, the image sensor further comprises a pre-storing module, connected to the blanking area determining module, for storing the register configuration parameters required by each frame of image to the image sensor driver.
The image sensor synchronous configuration method and device provided by the application have the beneficial effects that:
according to the image sensor synchronous configuration method provided by the embodiment of the application, for the image sensor chip without a grouping setting function, the relevant registers are rapidly configured in the blanking area of the data transmission of the image sensor, all the relevant registers can be guaranteed to be effective when the next frame of image is displayed, and the technical problems of abnormal display such as inconsistent image brightness and the like caused by the fact that a register group of the image sensor which does not support group writing cannot be synchronously effective are solved. According to the image sensor synchronous configuration device provided by the embodiment of the application, the registers are configured by using the image sensor synchronous configuration method provided by the embodiment of the application, and the technical problem that register groups cannot take effect at the same time is solved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a timing diagram of data transmission of an image sensor according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart illustrating a method for synchronously configuring an image sensor according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a blanking area determining method according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a register configuration parameter obtaining method according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a register configuration method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an image sensor synchronization configuration apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a timing diagram for Data transmission of an image sensor according to an embodiment of the present invention is shown in fig. 1, where T denotes a clock signal, V denotes a V sync (Vertical synchronization) signal, D denotes Data, f1 denotes a first frame image, f2 denotes a second frame image, f3 denotes a third frame image, and f4 denotes a fourth frame image, where the first frame, the second frame, the third frame, and the fourth frame are counted from a time T0.
As seen from FIG. 1, during the first frame timing time t0-t2, the data transmission is completed at time t1, time t1-t2 is a blanking region P, and no image data is transmitted during the blanking region P.
In the embodiment of the application, the registers required by the next frame image are configured in the blanking area, so that the registers required before the next frame image is displayed are completely configured, and the next frame image is prevented from being abnormal, and a specific implementation method is shown in fig. 2.
Fig. 2 is a schematic flowchart of a method for synchronously configuring an image sensor according to an embodiment of the present disclosure, and as shown in fig. 2, the method for synchronously configuring an image sensor according to the embodiment of the present disclosure specifically includes the following steps:
step S1 OO: and storing the register configuration parameters required by each frame of image to the image sensor driver.
Specifically, the register configuration parameters required for each frame of image that the image sensor needs to display are stored in the image sensor driver, and then returned directly without blocking. The non-blocking system does not block the current thread and can return to the I/O system immediately before the calling result can not be obtained immediately.
Step S110: and judging whether the time sequence state of the image sensor enters a blanking area or not.
Specifically, the method for determining whether the timing state of the image sensor enters the blanking region includes: judging whether the image sensor finishes transmitting the data of the current frame image, and judging to enter a blanking area according to the finish of transmitting the data of the current frame image by the image sensor; and judging that the image sensor does not enter a blanking area according to the fact that the image sensor does not finish transmitting the data of the current frame image.
Referring to fig. 3, a schematic flow chart of a method for determining whether data transmission of a current frame image is completed is shown, where as shown in fig. 3, the method for determining a blanking area provided in the embodiment of the present application specifically includes the following steps:
step S111: and monitoring the level state of the vertical synchronous signal of the image sensor in real time.
The vertical synchronization signal is obtained by detecting the V sync signal line. As shown in fig. 1, when the vertical synchronization signal changes from high level to low level, a vertical synchronization interrupt occurs, that is, at time t0 and time t1, a vertical synchronization interrupt occurs, and during time t0 and time t1-t2, the vertical synchronization interrupt signal can be detected.
According to the level state of the vertical synchronizing signal, whether data transmission enters a blanking area before the transmission of the next frame of image data can be further judged, so that the vertical synchronizing signal is monitored in real time in the embodiment of the application, and the register is configured in the blanking area.
Step S112: and judging whether the image sensor generates a last pixel interrupt signal or not according to the change of the level state from high level to low level.
And in the process of monitoring the vertical synchronizing signal, judging whether the vertical synchronizing signal is changed from a high level to a low level in real time, if so, further judging whether the image sensor generates a last pixel interrupt signal, and if not, continuing to execute the step S111 for monitoring.
Step S113: and judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
The image sensor generates a last pixel interrupt signal, which indicates that the data transmission of the current frame image is completed, thereby obtaining the data transmission entering the blanking area.
Step S120: if yes, the register configuration parameters needed by the next frame of image which is prestored are obtained from the image sensor drive.
Specifically, after the image sensor enters a blanking area of data transmission, a register configuration process of the next frame image is started immediately, so that the register configuration is ensured to be completed before the data transmission of the next frame image is started.
A register configuration parameter required by a next frame of image is stored in an image sensor driver, and referring to fig. 4, a method for acquiring a register configuration parameter from the image sensor driver is a schematic flow chart of a register configuration parameter acquisition method provided in an embodiment of the present application, as shown in fig. 4, the register configuration parameter acquisition method provided in the embodiment of the present application specifically includes the following steps:
step S121: and starting a callback function according to the last pixel interrupt signal.
Step S122: and starting an image sensor configuration task according to the callback function.
Step S123: and acquiring the pre-stored register configuration parameters required by the next frame of image from the image sensor driver according to the image sensor configuration task.
In the embodiment, the callback function is the callback function with the last pixel interrupted, the image sensor configuration task is started by using the callback function, the configuration flow of the sensor is carried out in the image sensor configuration task, the hierarchy is clear, and the execution efficiency is high.
Step S130: and configuring registers required by the next frame of image in the blanking area according to the configuration parameters.
Specifically, referring to fig. 5, a flowchart of a register configuration method provided in the embodiment of the present application is shown, as shown in fig. 5, the register configuration method provided in the embodiment of the present application specifically includes the following steps:
step S131: the configuration parameters are sent to the master control chip of the image sensor through an I2C driver.
Step S132: and the main control chip configures registers required by the next frame of image in the blanking area according to the configuration parameters.
In this embodiment, in a tasklet (image sensor configuration task) thread, the image sensor is controlled through I2C, specifically, a register updating function of the image sensor is called, and configuration parameters of a next frame of image temporarily stored in an image sensor driver are updated to an image sensor chip through an interface driven by I2C, so that configuration of a register required by the next frame of image is realized.
Referring to fig. 6, a schematic structural diagram of an image sensor synchronization configuration apparatus provided in an embodiment of the present application is shown in fig. 6, where the image sensor synchronization configuration apparatus provided in the embodiment includes a pre-storing module, a blanking area determining module, a register configuration parameter obtaining module, and a register configuration module.
Specifically, the pre-storage module is connected to the blanking area determining module, and is configured to store the register configuration parameters required by each frame of image to the image sensor for driving.
And the blanking area judging module is used for judging whether the time sequence state of the image sensor enters a blanking area. The blanking area judging module comprises a vertical synchronous signal monitoring unit, a last pixel interrupt signal monitoring unit and an output unit.
The synchronous signal acquisition unit is used for monitoring the level state of the vertical synchronous signal of the image sensor in real time; the last pixel interrupt signal monitoring unit is connected with the vertical synchronous signal monitoring unit and used for judging whether the image sensor generates a last pixel interrupt signal or not according to the change from the high level to the low level of the level state; and the output unit is connected with the last pixel interrupt signal monitoring unit and used for judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
The register configuration parameter acquisition module is connected with the blanking area judgment module and used for acquiring the pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to whether the time sequence state of the image sensor enters the blanking area. The register configuration parameter acquisition module comprises a callback function unit, an image sensor configuration task unit and a configuration parameter acquisition unit, wherein the callback function unit is used for starting a callback function according to a last pixel interrupt signal; the image sensor configuration task unit is connected with the callback function unit and used for starting an image sensor configuration task according to the callback function; the configuration parameter acquiring unit is connected with the image sensor configuration task unit and used for acquiring pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to the image sensor configuration task.
The register configuration module is connected with the register configuration parameter acquisition module and used for configuring registers required by the next frame of image in the blanking area according to the configuration parameters. The register configuration module comprises a configuration parameter transmission unit and a register configuration unit, wherein the configuration parameter transmission unit is used for transmitting configuration parameters to the I2C driver; and the register configuration unit is used for configuring registers required by the next frame image in the blanking area according to the configuration parameters.
As can be seen from the foregoing embodiments, according to the image sensor synchronization configuration method provided in the embodiments of the present application, for an image sensor chip without a group setting function, by rapidly configuring associated registers in a blanking area where data is transmitted by an image sensor, it can be ensured that all relevant registers are already in effect when displaying a next frame of image, and the technical problem of display abnormality such as inconsistent image brightness caused by a register group of an image sensor that does not support group writing failing to be in effect synchronously is solved. The blanking area of the image sensor for transmitting data is determined through the last pixel interruption, the time point when the register set works is accurately calculated according to the vertical synchronous signal for transmitting the image data, and accurate time reference is provided for an image processing algorithm; starting an image sensor configuration task thread in a callback function of the last pixel interrupt, collecting image sensor parameters configured by an application layer by using the image sensor configuration task thread, and transmitting the parameters to an I2C driver; the embodiment of the application also realizes the calling of the I2C driver in the soft interrupt processing. According to the image sensor synchronous configuration device provided by the embodiment of the application, the registers are configured by using the image sensor synchronous configuration method provided by the embodiment of the application, and the technical problem that register groups cannot take effect at the same time is solved.
Since the above embodiments are all incorporated by reference in other manners, and the description is given, the same parts are provided between different embodiments, and the same and similar parts between the various embodiments in this specification can be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (6)
1. An image sensor synchronous configuration method, comprising:
storing the register configuration parameters required by each frame of image to an image sensor for driving;
judging whether the time sequence state of the image sensor enters a blanking area or not;
if yes, starting a callback function according to the last pixel interrupt signal;
starting an image sensor configuration task according to the callback function;
acquiring a register configuration parameter required by a prestored next frame image from an image sensor drive according to the image sensor configuration task;
and configuring registers required by the next frame image in the blanking area according to the configuration parameters.
2. The method for synchronously configuring image sensors as claimed in claim 1, wherein said determining whether the timing state of the image sensor enters a blanking region comprises: and judging whether the image sensor finishes transmitting the data of the current frame image.
3. The method for synchronously configuring image sensors according to claim 2, wherein said determining whether the image sensor has completely transmitted the data of the current frame image comprises:
monitoring the level state of a vertical synchronous signal of the image sensor in real time;
judging whether the image sensor generates a last pixel interrupt signal or not according to the change from the high level to the low level of the level state;
and judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
4. The method for synchronously configuring image sensors according to claim 1, wherein the configuring the registers required by the next frame image in the blanking area according to the configuration parameters comprises:
sending the configuration parameters to a main control chip of the image sensor through an I2C driver;
and the main control chip configures registers required by the next frame of image in the blanking area according to the configuration parameters.
5. An image sensor synchronization configuration apparatus, comprising: a blanking region judging module, a register configuration parameter acquiring module and a register configuration module, wherein,
the blanking area judging module is used for judging whether the time sequence state of the image sensor enters a blanking area or not;
the register configuration parameter acquisition module is connected with the blanking area judgment module and used for acquiring pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to whether the time sequence state of the image sensor enters the blanking area;
the register configuration module is connected with the register configuration parameter acquisition module and is used for configuring registers required by the next frame of image in the blanking area according to the configuration parameters;
the register configuration parameter acquisition module comprises a callback function unit, an image sensor configuration task unit and a configuration parameter acquisition unit, wherein,
the callback function unit is used for starting a callback function according to the last pixel interrupt signal;
the image sensor configuration task unit is connected with the callback function unit and used for starting an image sensor configuration task according to the callback function;
the configuration parameter acquisition unit is connected with the image sensor configuration task unit and used for acquiring pre-stored register configuration parameters required by the next frame of image from the image sensor drive according to the image sensor configuration task;
the image sensor synchronous configuration device also comprises a pre-storage module, wherein the pre-storage module is connected with the blanking area judgment module and is used for storing the register configuration parameters required by each frame of image to the image sensor for driving.
6. The image sensor synchronization configuration apparatus of claim 5, wherein the blanking region judgment module includes a vertical synchronization signal monitoring unit, a last pixel interrupt signal monitoring unit, and an output unit, wherein,
the vertical synchronizing signal monitoring unit is used for monitoring the level state of the vertical synchronizing signal of the image sensor in real time;
the last pixel interrupt signal monitoring unit is connected with the vertical synchronous signal monitoring unit and used for judging whether the image sensor generates a last pixel interrupt signal or not according to the change from high level to low level of the level state;
the output unit is connected with the last pixel interrupt signal monitoring unit and used for judging that the time sequence state of the image sensor enters a blanking area according to the last pixel interrupt signal generated by the image sensor.
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