TWI848829B - Image processing device and method having motion detection mechanism - Google Patents

Abstract

An image processing device includes a memory, an image generator, and a motion detection circuit. The image generator generates first data according to input image data and stores the first data to the memory. The motion detection circuit detects whether there is a motion detection event in the input image data. Before the motion detection circuit detects the presence of the motion detection event, the image generator stores the first data in a first period, and after the motion detection circuit detects the presence of the motion detection event, the image generator stores the first data in a second period, and the first period is longer than the second period.

Description

Image processing device and method with motion sensing mechanism

This case is about an image processing device, and in particular, an image processing device and method having a motion sensing mechanism.

Generally speaking, dashcams use a high-performance image capture chip (operating as a host device) to capture images. When the vehicle is parked, the dashcam will enter the stationary mode for monitoring. However, in the prior art, dashcams operating in the stationary mode still use the image capture chip to capture images, resulting in higher power consumption and not meeting the need for long-term shooting when the vehicle is parked.

In some implementations, one of the purposes of this case is to provide an image processing device and method with a motion sensing mechanism, which can generate image data in different cycles to reduce power consumption and improve the shortcomings of the previous technology.

In some embodiments, the image processing device includes a memory, an image generator, and a motion sensing circuit. The image generator generates a first data according to an input image data, and stores the first data in the memory. The motion sensing circuit detects whether there is a motion sensing event in the input image data. Before the motion sensing circuit detects the existence of the motion sensing event, the image generator stores the first data in a first cycle, and after the motion sensing circuit detects the existence of the motion sensing event, the image generator stores the first data in a second cycle, and the first cycle is greater than the second cycle.

In some implementations, the image processing method includes the following operations: generating a first data according to an input image data; detecting whether a motion sensing event exists in the input image data; storing the first data in a memory for a first period before detecting the existence of the motion sensing event; and storing the first data in the memory for a second period after detecting the existence of the motion sensing event, wherein the first period is greater than the second period.

The features, implementation and effects of this case are described in detail below with reference to the diagrams for a preferred embodiment.

0~3: Port

100: Image processing device

101: Image sensor

110: Input interface circuit

115: Automatic exposure circuit

120: Image generator

121: Frame compression circuit

122: Image processing circuit

123: Image encoding circuit

124,140,141:Multiplexer

130: Motion sensing circuit

150:Memory

151~154: Storage space

160: Frame decompression circuit

165:Interface circuit

170: Controller

400: Image capture chip

410: Network device

500: Image processing method

D1,D11,D12,D2,D3,D4: Data

DIN1, DIN2: Input image data

MT,MTH,ST,STH:Parameters

P1, P2: period

S201~S207,S510,S520,S530,S540: Operation

SD: Video streaming

T1,T2: time

[Figure 1] is a schematic diagram of an image processing device according to some embodiments of the present invention; [Figure 2] is an operation flow chart of the image processing device of Figure 1 according to some embodiments of the present invention; [Figure 3] is a schematic diagram of the data in Figure 1, the data processed by the motion sensing circuit, and the input image data according to some embodiments of the present invention; [Figure 4] is a schematic diagram of an application example of the image processing device of Figure 1 according to some embodiments of the present invention; and [Figure 5] is a flow chart of an image processing method according to some embodiments of the present invention.

All terms used in this article have their usual meanings. The definitions of the above terms in commonly used dictionaries and the use examples of any term discussed herein in the content of this case are only examples and should not limit the scope and meaning of this case. Similarly, this case is not limited to the various embodiments shown in this specification.

As used herein, "coupling" or "connection" may refer to two or more components making physical or electrical contact directly or indirectly, or two or more components operating or acting on each other. As used herein, the term "circuit" may refer to a device that is composed of at least one transistor and/or at least one active and passive component connected in a certain manner to process signals.

FIG1 is a schematic diagram of an image processing device 100 according to some embodiments of the present invention. The image processing device 100 can receive input image data DIN1 from an image sensor 101, and can generate a plurality of image data with different formats according to the input image data DIN1.

The image processing device 100 includes an input interface circuit 110, an automatic exposure circuit 115, an image generator 120, a motion detection circuit 130, a multiplexer 140, a multiplexer 141, a memory 150, a frame decompression circuit 160, an interface circuit 165, and a controller 170. The input interface circuit 110 can receive input image data DIN1 from the image sensor 101, and transmit the input image data DIN1 to the automatic exposure circuit 115. In some embodiments, the input interface circuit 110 can be, but is not limited to, a digital video port circuit. The automatic exposure circuit 115 can generate exposure parameters for controlling the image sensor 101 according to the input image data DIN1, and generate input image data DIN2. In some embodiments, the input image data DIN2 is equivalent to the raw image data.

The image generator 120 may generate data D1 according to the input image data DIN2, and store the data D1 in the storage space 151 of the memory 150 via the connection port 0. In some embodiments, the image generator 120 may include a frame buffer compression circuit 121, an image processing circuit 122, an image encoding circuit 123, and a multiplexer 124. The frame compression circuit 121 may generate data D11 according to the input image data DIN2. For example, each pixel data in the input image data DIN2 is 8-bit data. The frame compression circuit 121 may compress the input image data DIN2 so that each pixel data is reduced to 6-bit data, thereby generating data D11. In some embodiments, data D11 may be compressed original image data.

The image processing circuit 122 may generate data D2 according to the input image data DIN2, and store the data D2 in the storage space 152 of the memory 150 via the connection port 1. In some embodiments, the image processing circuit 122 may perform image processing on the input image data DIN2, such as, but not limited to, automatic white balance, image format conversion (such as conversion to YUV format), etc., to generate data D2. The image encoding circuit 123 may read the data D2 from the storage space 152, thereby generating data D12 according to the data D2. For example, the image encoding circuit 123 may use image encoding technology to encode the data D2 to generate data D12. In some embodiments, data D12 may be a Joint Photographic Experts Group (JPEG) image file. In some embodiments, the data volume (or data size) of data D11 is greater than the data volume (or data size) of data D12. For example, data D11 may be original image data, and data D12 may be a JPEG image file, and the two may correspond to the complete content of the same frame.

The multiplexer 124 can receive data D11 and/or data D12, and output one of the data D11 and data D12 as data D1 according to the configuration of the controller 170, thereby storing the data D1 in the storage space 151 via the connection port 0. In some embodiments, the controller 170 can selectively enable one of the frame compression circuit 121 and the image processing circuit 122 to selectively generate data D11 or data D12. In this way, the circuit that is not enabled does not need to perform related operations, thereby saving more power consumption.

The multiplexer 140 can transmit the data D2 or the input image data DIN2 to the motion sensing circuit 130 based on the configuration of the controller 170, so that the motion sensing circuit 130 can detect whether the input image data DIN2 has a motion sensing event according to the received data. For example, the motion sensing circuit 130 can analyze whether there is an obvious pixel difference or an object outline between two consecutive frames in the received data to determine whether the input image data DIN2 has a motion sensing event. If the presence of a motion sensing event is detected, the motion sensing circuit 130 can send an interrupt signal (not shown) to the controller 170 to notify the controller 170 that the presence of a motion sensing event is detected. The motion sensing circuit 130 can store the analyzed data and/or related temporary data to the storage space 153 of the memory 150 via the connection port 2. The above operation method for detecting motion sensing events is only for example, and the present case is not limited thereto.

The controller 170 can control the memory 150 to output the data D1 from the storage space 151. In detail, the controller 170 can be used to control and/or configure the operation of multiple circuits in the image processing device 100. In some embodiments, the controller 170 can include multiple registers (not shown), which can be used to configure the aforementioned multiple circuits. For example, the controller 170 can set the parameters of the first register among the registers, so that the image generator 120 selects to enable the frame compression circuit 121 or the image processing circuit 122 according to the parameters in the first register, and controls the multiplexer 124 to output the data D11 or the data D12 as the data D1. Similarly, the controller 170 can set the parameters in the second register of the registers, so that the multiplexer 140 can transmit one of the data D2 or the input image data DIN2 to the motion sensing circuit 130 according to the parameters in the second register. In some embodiments, the controller 170 can temporarily store the relevant parameters used to configure the operation of other circuits in the storage space 154 of the memory 150 via the connection port 3. Through the above setting method, the above multiple circuits can be coordinated based on the configuration of the controller 170 and share the same memory 150. In some embodiments, the multiple connection ports 0~3 can be, but are not limited to, connection ports in the internal memory interface. In some embodiments, the memory 150 may be, but is not limited to, a static random access memory. In some embodiments, the controller 170 may be a microprocessor and/or microcontroller that executes a specific process or software, such as, but not limited to, an 8051 single-chip microcontroller.

The frame decompression circuit 160 can read the data D1 from the storage space 151 and generate data D3 according to the data D1. In the above example, each pixel data in the data D1 is 6-bit data. The frame decompression circuit 160 can restore each of the pixel data to 8-bit data to generate data D3. Based on the control of the controller 170, the multiplexer 141 can read other data from the memory 150 and output the data or the data D3 as data D4. The interface circuit 165 can receive data D4 from the multiplexer 141 and transmit the data D4 to at least one host device (such as, but not limited to, the image capture chip 400 and/or the network device 410 in FIG. 4 ) for subsequent image applications. In some embodiments, the interface circuit 165 can be, but not limited to, a Serial Peripheral Interface slave controller.

It should be understood that the configuration of the image processing device 100 in FIG. 1 is for example only and the present invention is not limited thereto. In practical applications, the image processing device 100 may further include an Inter-Integrated Circuit (I2C) bus master/slave controller, an infrared controller, a timer, a clock generator, etc. In some embodiments, the multiple circuits mentioned in FIG. 1 may be implemented by at least one digital circuit having image processing or data conversion capabilities.

In some embodiments, the aforementioned multiple registers can further store parameter ST, parameter STH, parameter MT and parameter MTH. The controller 170 can set the aforementioned multiple parameters according to the requirements of at least one of the aforementioned master control devices. In some embodiments, the controller 170 can control the image generator 120 to store data D1 in a first cycle before the motion sensing circuit 130 detects the existence of the motion sensing event according to the parameters ST and STH, and can control the image generator 120 to store data D1 in a second cycle after the motion sensing circuit 130 detects the existence of the motion sensing event according to the parameters MT and MTH, wherein the first cycle is greater than the second cycle. In other words, before the motion sensing circuit 130 detects the existence of the motion sensing event, the image generator 120 captures the content of the input image data DIN2 at a longer time interval (e.g., the period P1 in FIG. 3 ), and stores the captured data as data D1. In contrast, after the motion sensing circuit 130 detects the existence of the motion sensing event, the image generator 120 changes to capture the content of the input image data DIN2 at a shorter time interval (e.g., the period P2 in FIG. 3 ), and stores the captured data as data D1. The operation here will be described later with reference to FIG. 3 . In some embodiments, parameter ST can set the aforementioned first cycle, and parameter MT can set the aforementioned second cycle. For example, the aforementioned first cycle and second cycle can be defined by the number of frames. If parameter ST is set to 5, it means that before the motion sensing circuit 130 detects the existence of a motion sensing event, the image generator 120 will capture one frame in every 5 frames to generate data D1. Similarly, if parameter MT is set to 1, it means that after the motion sensing circuit 130 detects the existence of a motion sensing event, the image generator 120 will capture each frame to generate data D1. The above values of parameter ST and parameter MT are for example only, and the present case is not limited to this. In some embodiments, the value of each of the parameters ST and MT may be, but is not limited to, an integer greater than or equal to 0.

In some embodiments, if the first cycle defined by the parameter ST is greater than or equal to a preset value, the controller 170 may operate in a power saving mode before the motion sensing circuit 130 detects the presence of a motion sensing event. In other words, if the aforementioned first cycle is long enough, the controller 170 may operate in a power saving mode during the period before the presence of a motion sensing event is detected, and be awakened according to the number of frames defined by the parameter ST, thereby performing corresponding operations. In this way, the overall power consumption can be further saved.

In some embodiments, the parameter STH can set a maximum number of frames of the data D1 before the motion sensing circuit 130 detects the existence of a motion sensing event, and the parameter MTH can set a maximum number of frames of the data D1 after the motion sensing circuit 130 detects the existence of a motion sensing event. In other words, the parameter STH represents the upper limit of the number of frames that the storage space 151 can store before the existence of a motion sensing event is detected, and the parameter MTH represents the upper limit of the number of frames that the storage space 151 can store after the existence of a motion sensing event is detected. If the number of frames in the data D1 is equal to the maximum number of frames defined by the parameter STH before the motion sensing event is detected, the controller 170 can control the memory 150 to transmit the currently stored data D1 to at least one host device. Similarly, if the number of frames in the data D1 is equal to the maximum number of frames defined by the parameter MTH after the motion sensing event is detected, the controller 170 can control the memory 150 to transmit the currently stored data D1 to at least one host device. In some embodiments, the value of each of the parameters STH and MTH can be, but is not limited to, an integer greater than or equal to 1.

In the above example, the multiple parameters ST, MT, STH and MTH are stored in the register of the controller 170, but the present invention is not limited to this. In different embodiments, the multiple parameters ST, MT, STH and MTH can also be stored in the register of other circuits in the image generator 120.

FIG. 2 is an operation flow chart of the image processing device 100 of FIG. 1 according to some embodiments of the present invention. In operation S201, the controller 170 configures multiple parameters ST, MT, STH and MTH according to the requirements of the host device. In operation S202, in response to the interrupt signal corresponding to the input image data DIN2, the controller 170 determines to enable the frame compression circuit 121 or the image processing circuit 122.

For example, the input image data DIN1 may include multiple frames, and the input interface circuit 110, the automatic exposure circuit 115, the image generator 120, the motion sensing circuit 130 and other circuits perform image processing frame by frame. After transmitting a frame in the input image data DIN1, the input interface circuit 110 may send an interrupt signal (not shown) corresponding to the frame to trigger the controller 170, so that the controller 170 may decide to enable the frame compression circuit 121 or the image processing circuit 122 during the blank period between the frames. If the controller 170 enables the frame compression circuit 121, the controller 170 can disable the image processing circuit 122 and the image encoding circuit 123 to save power consumption, and the motion sensing circuit 130 can still detect the motion sensing event according to the input image data DIN2. Alternatively, if the controller 170 enables the image processing circuit 122, the controller 170 can disable the frame compression circuit 121 to save power consumption, and the motion sensing circuit 130 can detect the motion sensing event according to the data D2 or the input image data DIN2.

In operation S203, the motion sensing circuit 130 detects whether a motion sensing event exists according to the input image data DIN2. In operation S204, before the motion sensing circuit 130 detects the existence of a motion sensing event, the image generator 120 stores the data D1 in the first cycle according to the parameter ST. In operation S205, before the motion sensing circuit 130 detects the existence of a motion sensing event, if the number of frames in the data D1 is the same as the maximum number of frames defined by the parameter STH, the controller 170 controls the memory 150 to transmit the data D1 to the host device.

As described above, when the motion sensing circuit 130 detects the existence of a motion sensing event, the motion sensing circuit 130 will send an interrupt signal to notify the controller 170. Before receiving the interrupt signal, it means that the motion sensing circuit 130 has not detected the existence of the motion sensing event. In some embodiments, before the motion sensing circuit 130 detects the existence of the motion sensing event, the controller 170 can count according to the interrupt signal corresponding to each of the multiple frames in the input image data DIN1 (as described above, it is sent through the input interface circuit 110) to generate a count value. The controller 170 can compare the count value with the parameter ST to control the image generator 120 to generate data D1 in the first cycle before detecting the existence of the motion sensing event. For example, assuming that the image encoding circuit 123 is selected to generate data D1, the controller 170 may enable the image processing circuit 122 when the count value is equal to the number of frames defined by the parameter ST (or equal to a value before the number of frames), so that the image processing circuit 122 can generate data D2 accordingly, thereby enabling the image encoding circuit 123 to generate a corresponding frame in the data D1 according to the data D2. After generating the corresponding frame of the data D1, the controller 170 may disable the image processing circuit 122 to stop the image encoding circuit 123 from generating the next frame of the data D1, and reset the count value to continue to perform subsequent operations. Similarly, the controller 170 can selectively enable the corresponding circuit of the image generator 120 according to the parameter ST and the counting operation, and adjust the data transmission in the image generator 120 accordingly, so that the image generator 120 generates multiple frames in the data D1 in the first cycle. Then, if the number of frames in the stored data D1 is the same as the maximum number of frames defined by the parameter STH, the memory 150 can transmit the data D1 to the host device via the frame decompression circuit 160 and the interface circuit 165.

In operation S206, after the motion sensing circuit 130 detects the existence of a motion sensing event, the image generator 120 stores the data D1 in the second cycle according to the parameter MT. In operation S207, after the motion sensing circuit 130 detects the existence of a motion sensing event, if the number of frames in the data D1 is the same as the maximum number of frames defined by the parameter MTH, the controller 170 controls the memory 150 to transmit the data D1 to the host device.

Similarly, in some embodiments, the controller 170 may count to generate a count value according to an interrupt signal corresponding to each of a plurality of frames in the input image data DIN1 (as described above, sent via the input interface circuit 110) during a period after the motion sensing circuit 130 detects the presence of a motion sensing event. The controller 170 may compare the count value with the parameter MT to control the image generator 120 to generate data D1 in a second cycle during a period after the motion sensing event is detected. For example, assuming that the image encoding circuit 123 is selected to generate data D1, the controller 170 may enable the image processing circuit 122 when the count value is equal to the number of frames defined by the parameter MT (or equal to a value before the number of frames), so that the image processing circuit 122 can generate data D2 accordingly, thereby enabling the image encoding circuit 123 to generate a corresponding frame in the data D1 according to the data D2. After generating the corresponding frame of the data D1, the controller 170 may disable the image processing circuit 122 to stop the image encoding circuit 123 from generating the next frame of the data D1, and reset the count value to continue to perform subsequent operations. Similarly, the controller 170 can selectively enable the corresponding circuit of the image generator 120 according to the parameter MT and the counting operation, so that the image generator 120 can generate the frames in the data D1 in the second cycle. Then, if the number of frames in the stored data D1 is the same as the maximum number of frames defined by the parameter MTH, the memory 150 can transmit the data D1 to the host device via the interface circuit 165.

The above operation is explained by taking the image encoding circuit 123 as an example to generate data D1, but the present invention is not limited thereto. In other embodiments, if the image generator 120 selects the frame compression circuit 121 to generate data D1, the controller 170 can enable the frame compression circuit 121 when the count value is equal to the number of frames defined by the parameter ST (or parameter MT) (or equal to a value before the number of frames), thereby controlling the image generator 120 to store data D1 in the first cycle (or the second cycle).

FIG3 is a schematic diagram of the data D1 in FIG1 , the data processed by the motion sensing circuit 130 , and the input image data DIN1 according to some embodiments of the present invention. In FIG3 , each line segment on the time axis represents a frame.

At time T1, the motion sensing circuit 130 detects the existence of a motion sensing event. In the period before time T1 (i.e., before the motion sensing event is detected), the image generator 120 will store data D1 with period P1 (i.e., the first period defined by parameter ST). In the period after time T1 (i.e., after the motion sensing event is detected), the image generator 120 will store data D1 with period P2 (i.e., the second period defined by parameter MT). As shown in FIG3, period P1 is greater than period P2. In other words, before time T1, the image generator 120 can store one frame as data D1 after several frames (corresponding to the time interval of period P1). After time T1, the image generator 120 can store each frame (corresponding to the time interval of period P2) as data D1. It should be understood that the setting method of period P1 and period P2 in Figure 3 is only an example, and the present case is not limited to this.

On the other hand, in some embodiments, at time T1, the controller 170 may wake up the host device according to an interrupt signal corresponding to a motion sensing event. Thus, when the number of frames of the data D1 after time T1 is equal to the maximum number of frames defined by the parameter MTH (e.g., time T2), the memory 150 may transmit the data D1 to the host device. In other words, in the image processing device 100, the awakening period of the host device and the period of collecting images after detecting the existence of a motion sensing event have at least partial overlap to achieve better processing efficiency.

In some applications, the above-mentioned setting method can be applied to the parking mode in the dash cam. For example, before detecting that a motion sensing event such as a collision or contact occurs to a stationary vehicle, the dash cam can record the captured image data with a larger period P1, thereby saving power consumption and storage capacity of the memory 150. After detecting that a motion sensing event such as a collision or contact occurs to a stationary vehicle, the dash cam can record the captured image data with a smaller period P1 to obtain a more complete image record. The above-mentioned application is only an example, and the present case is not limited thereto.

FIG4 is a schematic diagram of an application example of the image processing device 100 of FIG1 according to some embodiments of the present invention. In this example, the aforementioned at least one host device includes an image capture chip 400 and a network device 410. In some embodiments, the network device 410 can be coupled to the image processing device 100 via, but not limited to, a wireless network to receive data D4 (which is data D1 generated before a motion sensing event is detected). The image capture chip 400 can receive data D4 (which is data D1 after a motion sensing event is detected) from the image processing device 100, and generate an image stream SD based on the data D4, thereby transmitting the image stream SD to the network device 410. In this way, the network device 410 can upload the image stream SD and the previously received data D1 to a cloud space. The above-mentioned setting method can reduce the number of times the image capture chip 400 is awakened, thereby saving more power consumption.

FIG. 5 is a flow chart of an image processing method 500 according to some embodiments of the present invention. In some embodiments, the image processing method 500 may be executed by, but not limited to, the image processing device 100 of FIG. 1 .

In operation S510, a first data is generated according to an input image data. In operation S520, it is detected whether the input image data has a motion sensing event. In operation S530, before the motion sensing event is detected, the first data is stored in a memory for a first period. In operation S540, after the motion sensing event is detected, the first data is stored in the memory for a second period, wherein the first period is greater than the second period.

The above-mentioned operations can refer to the description of the aforementioned embodiments, so they will not be repeated here. The multiple operations in the image processing method 500 are only examples, and are not limited to be executed in the order in this example. Without violating the operation mode and scope of each embodiment of this case, the various operations in the image processing method 500 can be appropriately added, replaced, omitted or executed in a different order (for example, they can be executed simultaneously or partially simultaneously).

In summary, the image processing device and method in some embodiments of the present invention may have a motion sensing mechanism and generate image data in different cycles, thereby meeting the application requirements of low power consumption.

Although the embodiments of this case are described above, these embodiments are not used to limit this case. People with ordinary knowledge in this technical field can make variations to the technical features of this case based on the explicit or implicit content of this case. All these variations may fall within the scope of patent protection sought by this case. In other words, the scope of patent protection of this case shall be subject to the scope of patent application defined in this specification.

0~3: Port

100: Image processing device

101: Image sensor

110: Input interface circuit

115: Automatic exposure circuit

120: Image generator

121: Frame compression circuit

122: Image processing circuit

123: Image encoding circuit

124,140,141:Multiplexer

130: Motion sensing circuit

150:Memory

151~154: Storage space

160: Frame decompression circuit

165:Interface circuit

170: Controller

D1,D11,D12,D2,D3,D4: Data

DIN1, DIN2: Input image data

MT,MTH,ST,STH:Parameters

Claims (9)

An image processing device includes: a memory; an image generator, generating a first data according to an input image data, and storing the first data in the memory; and a motion sensing circuit, detecting whether the input image data has a motion sensing event; wherein before the motion sensing circuit detects the existence of the motion sensing event, the image generator stores the first data in a first cycle, and after the motion sensing circuit detects the existence of the motion sensing event, the image generator stores the first data in a second cycle, and the first cycle is greater than the second cycle. The image processing device of claim 1 further comprises: a controller for configuring a first parameter and a second parameter, wherein the first parameter is used to set the first cycle, and the second parameter is used to set a maximum number of frames of the first data before the motion sensing circuit detects the existence of the motion sensing event. As in claim 2, the image processing device, wherein the input image data includes a plurality of frames, the controller counts according to an interrupt signal corresponding to each of the frames to generate a count value, and compares the count value with the first parameter to control the image generator to store the first data in the first cycle before the motion sensing circuit detects the existence of the motion sensing event. An image processing device as claimed in claim 2, wherein if the first cycle is greater than or equal to a preset value, the controller operates in a power saving mode before the motion sensing circuit detects the presence of the motion sensing event. As in claim 2, the image processing device, wherein before the motion sensing circuit detects the existence of the motion sensing event, if the number of frames included in the first data is the same as the maximum number of frames, the memory transmits the first data to a host device. The image processing device of claim 1 further comprises: a controller for configuring a third parameter and a fourth parameter, wherein the third parameter is used to set the second cycle, and the fourth parameter is used to set a maximum number of frames of the first data after the motion sensing circuit detects the motion sensing event. As in claim 6, the image processing device, wherein the input image data includes a plurality of frames, the controller counts according to an interrupt signal corresponding to each of the frames to generate a count value, and compares the count value with the third parameter to control the image generator to store the first data in the second cycle after the motion sensing circuit detects the existence of the motion sensing event. As in claim 6, the image processing device, wherein after the motion sensing circuit detects the existence of the motion sensing event, if the number of frames included in the first data is the same as the maximum number of frames, the memory transmits the first data to a host device. An image processing method is performed by an image processing device, the image processing method comprising: generating a first data according to an input image data; detecting whether a motion sensing event exists in the input image data; storing the first data in a memory for a first period before detecting the existence of the motion sensing event; and storing the first data in the memory for a second period after detecting the existence of the motion sensing event, wherein the first period is greater than the second period.

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