A shutter control circuit for bullet time shooting

Abstract

The present invention discloses a shutter control circuit for bullet time shooting, belonging to the field of camera shutter control. It includes an input terminal JP1, a single-chip microcomputer K, a latch, wiring terminals K1-K100, and an output terminal J101. The single-chip microcomputer includes a main control chip, and the main control chip is externally connected with a passive crystal oscillator and a reset button. It also includes a switching power supply chip U27, which can be realized. The shutter control circuit for bullet time shooting of the present invention uses a single-chip microcomputer plus multiple 8-bit latches. Two latches are taken as a group. The front-stage latch mainly stores data to realize data pre-locking, and the rear-stage latch mainly realizes synchronous release of data at specific times to achieve complete synchronization, realizing complete synchronization of the single-chip microcomputer across-group I / O.

Description

Technical Field

[0001] The present invention relates to the technical field of camera shutter control, and more specifically, to a shutter control circuit for bullet time shooting. Background Art

[0002] Bullet time is a photographic technique used in movies, TV commercials, or computer games to simulate variable-speed special effects, such as enhanced slow motion, time stillness, etc. This technique is widely used in the fields of film and television, advertising, creative activities, etc.

[0003] Bullet time was initially achieved using a series of stationary cameras (instead of video cameras) around an object. These camera arrays are usually triggered to take pictures simultaneously or sequentially. Combining each frame of pictures taken by each camera can form a perspective rotation effect of a stationary object, or a super slow motion effect. Involving simultaneous control and sequential control, it is difficult to meet partial simultaneity in simultaneity or sequence if solely controlled by an MCU (Micro Control Unit).

[0004] Existing bullet time shooting shutter controllers generally use a single-chip microcomputer plus MOS for direct control. The control effect is directly related to the processing speed of the single-chip microcomputer, and the single-chip microcomputer cannot achieve complete synchronization of cross-group I / O. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a shutter control circuit for bullet time shooting. The shutter control circuit for bullet time shooting of the present invention uses a single-chip microcomputer plus multiple 8-bit latches. Two latches form a group. The front-stage latch mainly stores data to achieve data pre-locking, and the rear-stage latch mainly realizes synchronous release of data at a specific time to achieve complete synchronization, realizing complete synchronization of cross-group I / O of the single-chip microcomputer.

[0007] 2. Technical Solutions

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A shutter control circuit for bullet time shooting includes an input terminal JP1, a single-chip microcomputer, multiple groups of latches, connection terminals K1-K100, and an output terminal J101. The single-chip microcomputer includes a main control chip, and a passive crystal oscillator and a reset button are externally connected to the main control chip. A switching power supply chip U27 is also included.

[0010] Further, the input terminal JP1 is externally connected to a DC voltage of 5 - 25V. For the stability of the system, a power supply voltage of 12V is preferably used. The input terminal JP1 is also connected to an input filter capacitor C9, and the input filter capacitor C9 is used to ensure the stability of the input power supply.

[0011] Further, the main control chip uses a chip of the STM32RBT6 model.

[0012] Further, on the main control pins of the main control chip, the network labels EN1 - EN14 are used to control the enable terminals of the latches, and I1 - I8 are used to supply 8 - bit parallel data to the latches.

[0013] Further, each group of the latches includes pre - stage latches D1 - D8 and post - stage latches Q1 - Q8. The pre - stage latches are mainly used to store data for realizing data pre - locking, and the post - stage latches are mainly used to synchronously release data when a pre - set shutter trigger occurs to achieve full synchronization.

[0014] Further, the connection terminals K1 - K100 are used to connect to the camera. The network labels J1 - J100 corresponding to the 100 connection terminals K1 - K100 are the shutter control signals of 100 cameras.

[0015] Further, the com terminals of the connection terminals K1 - K100 are connected to the focus signal of the camera, the com terminal of the input terminal J101 is connected to the focus input signal of the shutter controller. The com terminals of the connection terminals K1 - K100 are the common terminals, and the com terminals of the connection terminals K1 - K100 and the com terminal of the output terminal J101 are shared.

[0016] Further, the switching power supply chip U27 adopts a buck structure and integrates an internal MOS tube, which is used to provide an output current of about 3A. The output terminal of the switching power supply chip U27 is also connected to an output filter capacitor C10. After being processed by the switching power supply chip U27, a voltage of 3.3V is obtained across the output filter capacitor C10. The subsequent C11 - C36 is an output high - frequency filter, which is used to be connected near the power supplies of each chip to suppress high - frequency interference.

[0017] Further, the circuit system of the shutter control circuit includes a focus signal receiving circuit, a shutter signal receiving circuit, a camera focusing and shutter control circuit, and a serial port for realizing the setting circuit of the timing delay time;

[0018] The focus signal receiving circuit is used to receive the focus signal to wake up the camera;

[0019] The shutter signal receiving circuit is used to receive the shutter signal to lock the focus and quickly synchronously trigger the shutter and release the shutter according to the set time;

[0020] The camera focusing and shutter control circuit is used for the single-chip microcomputer to receive a trigger signal to control the latch, from pre-latching to releasing the signal, and then control the MOS to achieve the focusing of the camera and the control of the shutter;

[0021] The serial port implementation timing delay time setting circuit is used for the single-chip microcomputer to interact and communicate data with the computer through the serial port TTL signal and store it in the internal flash.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] The existing bullet time shooting shutter controller generally uses a single-chip microcomputer plus MOS for direct control. The control effect is directly related to the processing speed of the single-chip microcomputer, and the single-chip microcomputer cannot achieve complete synchronization of cross-group I / O. The present invention aims to solve the problems of fast control and complete synchronization.

[0025] The shutter control circuit for bullet time shooting of the present invention uses a single-chip microcomputer plus multiple 8-bit latches. Two latches are in a group. The front-stage latch mainly stores data to achieve data pre-latching, and the rear-stage latch mainly realizes synchronous release of data at a specific time to achieve complete synchronization, realizing complete synchronization of the single-chip microcomputer's cross-group I / O. Description of the drawings

[0026] Figure 1 It is the circuit diagram of the single-chip microcomputer in the present invention;

[0027] Figure 2 It is the circuit diagram of the single-chip microcomputer 101 in the present invention;

[0028] Figure 3 It is the circuit diagram of the latch in the present invention;

[0029] Figure 4 It is the circuit diagram of the wiring terminals K1-K100 in the present invention;

[0030] Figure 5 It is the circuit diagram of the power supply chip in the present invention. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1:

[0035] Please refer to Figures 1-5 A shutter control circuit for bullet time shooting. In the circuit, JP1 is an input terminal and can be externally connected to a DC voltage of 5 - 25V. For the stability of the system, a 12V power supply voltage is generally selected. C9 is an input filter capacitor to ensure the stability of the input power supply. The switching power supply chip U27 adopts a buck structure and internally integrates a MOS tube, which can provide an output current of about 3A. After the processing of U27, a voltage of 3.3V is obtained across the capacitor C10. The function of C10 is an output filter, and the subsequent C11 - C36 is an output high-frequency filter, which is used to be connected near the power supplies of each chip to suppress high-frequency interference; stm1 is the main control chip, and this main control uses the STM32RBT6 of STMicroelectronics. This main control chip is externally connected with an 8M passive crystal oscillator and a button for reset, and these constitute the minimum system circuit of the single-chip microcomputer. The pins of this main control with the network labels EN1 - EN14 are used to control the enable terminals of the latch. I1 - I8 are for providing 8-bit parallel data to the latch. The wiring terminals K1 - K100 are used to connect to cameras, and a total of 100 Canon single-lens reflex cameras are connected. The network labels J1 - J100 corresponding to these 100 terminals K1 - K100 are the shutter control signals for 100 cameras. The COM terminals of these 100 terminals are common and share the COM terminal of the output terminal J101. This is for connecting the focus signal of the camera, and the COM terminal of the just-mentioned input terminal J101 is for connecting the focus input signal of the shutter controller, that is, the focus of the shutter controller directly controls the camera;

[0036] The focus signal is directly connected to the focus trigger port of the camera. When the focus signal is detected, the camera focus is directly triggered. Once the shutter signal is pressed, the single-chip microcomputer K101 detects a low level, locks the focus and starts to execute the first step of triggering. It is only necessary to directly release the trigger port EN14. The actual circuit requires that the signal data shown before triggering has been shown at Q1-Q8 of U1. After triggering, what is released is the enable LE (network EN14) of U2 and then it is latched immediately. LE is the enable terminal for the change of the output terminal state. When LE is at a low level, the output terminal Q always maintains the signal stored last time (input from the D terminal). When LE is at a high level, Q follows the change of the state of D and latches the state of D. After LE is latched, a new set of data is directly loaded. The latch is released again at the set time until the triggering is completely finished. The UART_TX and UART_RX of the single-chip microcomputer communicate with the computer end through serial port to time-delay data.

[0037] The above; only the preferred specific implementation mode of the present invention; but the protection scope of the present invention is not limited thereto; any person skilled in the art within the technical scope disclosed by the present invention; according to the technical solution of the present invention and its improved concept, making equivalent substitution or change; should be covered by the protection scope of the present invention.

Claims

1. A shutter control circuit for bullet time shooting, comprising an input terminal JP1, a single-chip microcomputer, multiple groups of latches, connection terminals K1-K100, and an output terminal J101. The single-chip microcomputer includes a main control chip, and the main control chip stml uses a chip of the STM32RBT6 model. The main control chip is externally connected with a passive crystal oscillator and a reset button. There is also a switching power supply chip U27. The input terminal JP1 is externally connected with a DC voltage of 5-25V. The input terminal JP1 is also connected with an input filter capacitor C9, and the input filter capacitor C9 is used to ensure the stability of the input power supply. The main control pins of the main control chip with network labels EN1-EN14 are used to control the enable terminals of the latches, and I1-I8 are used to supply 8-bit parallel data to the latches. Each group of latches includes a pre-stage latch D1-D8 and a post-stage latch Q1-Q8. The pre-stage latch is mainly used to store data for data pre-locking, and the post-stage latch is mainly used to synchronously release data when the shutter is triggered as pre-set to achieve complete synchronization. The connection terminals K1-K100 are used to connect with the camera. The network labels J1-J100 corresponding to the 100 connection terminals K1-K100 are the shutter control signals of 100 cameras. The com terminal of the connection terminals K1-K100 is connected with the focus signal of the camera. The com terminal of the input terminal J101 is connected with the focus input signal of the shutter controller. The com terminal of the connection terminals K1-K100 is the common terminal, and the com terminal of the connection terminals K1-K100 and the com terminal of the output terminal J101 are shared. The switching power supply chip U27 adopts a buck structure and internally integrates a MOS tube, which is used to provide a current output of about 3A. The output terminal of the switching power supply chip U27 is also connected with an output filter capacitor C10. After being processed by the switching power supply chip U27, a voltage of 3.3V is obtained across the output filter capacitor C10. The subsequent C11-C36 is an output high-frequency filter, which is used to be connected near the power supplies of each chip to suppress high-frequency interference; The circuit system of the shutter control circuit includes a focus signal receiving circuit, a shutter signal receiving circuit, a camera focusing and shutter control circuit, and a serial port to implement a timing delay time setting circuit; The focus signal receiving circuit is used to receive the focus signal to wake up the camera; The shutter signal receiving circuit is used to receive the shutter signal to lock the focus, quickly synchronously trigger the shutter according to the set time, and release the shutter; The camera focusing and shutter control circuit is used for the single-chip microcomputer to receive the trigger signal to control the latch, from pre-locking to releasing the signal, and then control the MOS to achieve the focusing and shutter control of the camera; The serial port to implement a timing delay time setting circuit is used for the single-chip microcomputer to interact and communicate data with the computer through the serial port TTL signal and store it in the internal flash.

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