CN112118383A

CN112118383A - Method for obtaining double-camera data through single-camera controller

Info

Publication number: CN112118383A
Application number: CN201910532151.4A
Authority: CN
Inventors: 杨欢欢
Original assignee: Shenzhen Ingenic Time Semiconductor Co ltd
Current assignee: Shenzhen Ingenic Time Semiconductor Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-12-22

Abstract

The invention provides a method for acquiring double-camera data by a single-camera controller, which comprises the following steps: 1, supplying power to a camera module; 2-3, the single-camera controller sends initialization lists to the first camera and the second camera through IIC-1 and IIC-2 interfaces respectively; 4, the single-camera controller sends an enabling command to the first camera through the IIC-1 interface, and the first camera sends the acquired data to a specified cache of the CPU through a specified time sequence according to the initialized configuration; 5, the single-camera controller receives a frame of complete data and generates an interrupt to inform an application program to collect first camera data from a specified buffer area; and 6, immediately sending a prohibition command to the first camera through the IIC-1 after the interruption occurs, sending an enable command to the second camera through the IIC-2 after the prohibition command is sent, sending the acquired data to a specified cache of the CPU through a specified time sequence according to the initialized configuration by the second camera, and acquiring the data of the color camera.

Description

Method for obtaining double-camera data through single-camera controller

Technical Field

The invention relates to the technical field of face image recognition, in particular to a method for obtaining double-camera data through a single-camera controller.

Background

With the continuous development of science and technology, particularly the development of computer vision technology, the face recognition technology is widely applied to various fields such as information security, electronic authentication and the like, and with the progress of science and technology, more and more biometric-based technologies are applied to the daily life of people. For example, the face recognition technology is applied to attendance machines, face payment, intelligent locks based on face recognition and the like. More and more face recognition technologies provide better experience for users and more convenient service. As basic equipment of the face recognition technology: dual cameras are increasingly being provided in mobile or non-mobile terminals. Whether the image of the face is a living face or not can be judged based on the feature values extracted by the two cameras.

In order to facilitate face recognition, one of the two cameras is a black-and-white image camera, and the other one is a color image camera. Whether the image of the face is a live face can be judged based on the feature values extracted by the two cameras. And the two cameras on the current market are mostly in a one-to-one mode that one camera corresponds to one camera controller. And the selection range of manufacturers is small, and the price is high. Current implementations require more than 2 camera controllers in the CPU to acquire black and white and color images, respectively. But most of the CPUs in common use in the market only have one camera for control. Therefore, the selectable range of manufacturers is small, and the CPU with 2 camera controllers is high in common price. Resulting in an increase in the price of the product and a decrease in competitiveness.

Disclosure of Invention

In order to solve the problems in the prior art, the present invention aims to: the method can use one camera controller to connect and control two cameras. And connecting the data lines and the control lines of the two cameras together and connecting the data lines and the control lines with a camera controller. The two cameras respectively send the data collected by the cameras to the controller in a time-sharing multiplexing mode. Therefore, the selectable range of the CPU is greatly increased, and the cost can be greatly reduced. Wherein, the CPU: english Central processing Unit central processing Unit abbreviation. IIC: english Inter-integrated circuit bus abbreviation; this bus type is a simple, bi-directional, two-wire, synchronous serial bus designed by philips semiconductors; the method is mainly used for master-slave communication between the master controller and the slave devices, is used in small data volume occasions, and has short transmission distance. High resistance state: is a common term in a digital circuit, and refers to an output state of the circuit, which is neither high level nor low level, and has no influence on a next circuit if a high impedance state is input into the next circuit, and is basically the same as the output state.

The invention provides a method for obtaining double-camera data through a single-camera controller, which comprises the following steps:

s1, supplying power to the double-camera module;

s2, the single camera controller sends the initialization list to the first camera through the IIC-1 interface

The camera sensor starts to work and converts the sensed result into a digital signal;

s3, the single camera controller sends the initialization list to the second camera through the IIC-2 interface

A head module;

s4, the single camera controller sends an enabling command to the first camera through the IIC-1 interface

A module, the first camera module will acquire through a specified time sequence according to the initialized configuration

The collected data is sent to a designated cache of the CPU;

s5, the single-camera controller receives a frame of complete data and generates an interrupt to inform

The application program module acquires data of the first camera from the designated buffer area;

s6, transmitting a disable command to the first camera through IIC-1 immediately after the interrupt is generated,

transmitting an enable command to the second camera through the IIC-2 after the transmission of the disable command is completed, and then

The second camera module collects the collected data according to the initialized configuration through the designated time sequence

Sending the color data to a designated cache of the CPU, and informing the application program module to acquire the color from the cache

Data of the color camera.

The images collected by the first camera module are black and white.

The image collected by the second camera module is colorful.

In the process of step S5, the second camera is in the disabled state, and the data line and the clock line of the corresponding interface are both in the high impedance state.

The first camera module, the second camera module data line and the clock line are common but do not influence the first camera to transmit data.

And the resolution ratios of the cameras of the first camera module and the second camera module are the same.

The IIC-1 interface and the IIC-2 interface can be distinguished only by adopting different IIC addresses of the two camera modules.

The first camera module and the second camera module can be distinguished through IIC addresses.

The application has the advantages that: from the above, the method for controlling the dual cameras by the single-camera controller provided by the invention connects the data lines and the control lines of the two cameras together and is connected with the camera controller. The two cameras respectively send the data collected by the cameras to the controller in a time-sharing multiplexing mode. Therefore, the optional range of the CPU is greatly increased, the cost can be greatly reduced, and the technical effect that the double cameras can work is achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic block diagram of a system to which the present invention relates.

FIG. 2 is a block diagram of a method flow of an embodiment of the present invention.

Detailed Description

The following is a specific embodiment related to the present invention, wherein, as shown in fig. 1, the present invention includes a camera controller, the camera controller is disposed in the CPU, and further includes a first camera module and a second camera module; the camera controller is connected with the first camera module and the second camera module through a data line, a clock line and an MCLK line; and the CPU is provided with an IIC-1 interface and an IIC-2 interface which are respectively connected with the first camera module and the second camera module.

The process of operating the camera is as follows:

firstly, the camera module is powered on,

secondly, sending an initialization list to a camera module through an IIC interface (a camera sensor starts working to convert the sensed result into a digital signal),

and sending the enabling command to the camera module again, and sending the acquired data to a cache appointed by the CPU by the camera through an appointed time sequence according to the initialized configuration.

And finally, the camera controller receives a frame of complete data, generates an interrupt and informs an application program to obtain a frame of acquired image data from the specified buffer area.

When the prohibition command is sent to the camera module, the interfaces for transmitting data are all high-impedance, so that the data transmission of the camera parallel to the interfaces is not influenced.

When the method is implemented, as shown in fig. 2, the process of acquiring the image from the camera module is as follows:

firstly, supplying power to the double-camera module;

secondly, the single-camera controller sends an initialization list to the first camera module through an IIC-1 interface;

thirdly, the single-camera controller sends the initialization list to the second camera module through the IIC-2 interface;

then, the single-camera controller sends an enabling command to a first camera module through an IIC-1 interface, and the first camera module sends the acquired data to a specified cache of a CPU (central processing unit) through a specified time sequence according to the initialized configuration;

then, the single-camera controller receives a frame of complete data, generates an interrupt at the same time, and informs the application program module to acquire the data of the first camera from the designated cache;

and finally, immediately sending a prohibition command to the first camera through the IIC-1 after the interruption is generated, sending an enable command to the second camera through the IIC-2 after the prohibition command is sent, sending the acquired data to a specified cache of the CPU through a specified time sequence by the second camera module according to the initialized configuration, and acquiring the data of the color camera by the application program module.

Since a camera controller is used, the resolution of the first camera and the second camera must be the same, otherwise no valid data can be acquired. The IIC-1 interface and the IIC-2 interface can be distinguished only by adopting different IIC addresses of the two camera modules, and the first camera and the second camera can be distinguished through the addresses.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for obtaining dual-camera data via a single-camera controller, the method comprising:

s1, supplying power to the double-camera module;

s2, the single-camera controller sends the initialization list to the first camera module through the IIC-1 interface;

s3, the single-camera controller sends the initialization list to the second camera module through the IIC-2 interface;

s4, the single-camera controller sends an enabling command to the first camera module through the IIC-1 interface, and the first camera module sends the acquired data to a designated cache of the CPU through a designated time sequence according to the initialized configuration;

s5, the single-camera controller receives a frame of complete data, and simultaneously generates an interrupt to inform the application program module to acquire the data of the first camera from the specified cache;

and S6, immediately sending a prohibition command to the first camera through the IIC-1 after the interruption occurs, sending an enable command to the second camera through the IIC-2 after the prohibition command is sent, sending the collected data to a specified cache of the CPU through a specified time sequence by the second camera module according to the initialized configuration, and informing the application program module to obtain the data of the second camera from the specified cache.

2. The method of claim 1, wherein the images captured by the first camera module are black and white.

3. The method of claim 1, wherein the image captured by the second camera module is in color.

4. The method of claim 1, wherein during step S5, the second camera is in an inhibit state, and the data line and the clock line of the corresponding interface are both in a high impedance state.

5. The method for obtaining the data of the double cameras through the single camera controller according to claim 4, wherein the first camera module, the second camera module data line and the clock line are common but do not affect the data transmission of the first camera.

6. The method of claim 1, wherein the resolution of the cameras of the first camera module and the second camera module are the same.

7. The method of claim 1, wherein the IIC-1 interface and the IIC-2 interface can be distinguished by using different IIC addresses of two camera modules.

8. The method of claim 7, wherein the first camera module and the second camera module are distinguishable by an IIC address.