TWI513314B - Image recording method and portable electronic device - Google Patents

Description

Image recording method and portable electronic device

The present invention relates to an electronic device and a method of operating the same, and more particularly to a portable electronic device capable of generating a mixed image and a method of operating the same.

In today's era of information explosion, human life is inseparable from electronic communication. It is quite common to use electronic communication devices to transmit messages to each other, especially portable electronic devices that can be carried around, such as mobile phones. A telephone or an electronic device with wireless communication capabilities.

Today, mobile communication technology is increasingly developed, and the functions of portable electronic devices are constantly being introduced. In addition to listening to broadcast and other functions, many portable electronic devices have been developed with camera functions, so when users want to take pictures, they can take digital images with portable electronic devices with camera or video functions. However, a portable electronic device generally having a camera or video function separates the photographing and recording functions, so that only a still photo can be generated when photographing, and only a dynamic movie can be generated when recording. Although still photos have higher resolution and better image quality, it is easy to miss the brilliant moment when the shutter is pressed due to delay, and it is impossible to capture the scene outside the shutter moment. On the other hand, although the video can record the live dynamics as a continuous screen, the user spends more time browsing, and the result of capturing a single image frame in the dynamic movie is not as good as the resolution and quality. Static photo.

The invention provides an image recording method, which can effectively grasp the image capturing timing and retain the complete image recording of the shooting entity.

The invention provides a portable electronic device, which can save storage capacity and save time for users to browse image records.

The present invention provides an image recording method, which is applicable to a portable electronic device. The image recording method includes: recording a mixed image of at least one shooting entity, wherein the mixed image includes at least one moving image and a static of the at least one shooting entity An image, and the at least one motion image includes a plurality of image frames and has a fixed frame rate. The mixed image is compressed by sampling the image frames to change the fixed frame rate to a variable frame rate.

In an embodiment of the present invention, the image recording method, wherein the step of sampling the image frames to compress the mixed image comprises: The image frames are sampled according to an image capturing time point of the still image, so that the number of sampling frames of the variable frame rate increases as the image capturing time point approaches.

In an embodiment of the present invention, in the image recording method, the closer to the image capturing time point, the frame rate is gradually increased from 15 to 20 frames per second to 30 frames per second.

In an embodiment of the present invention, the image recording method, wherein the step of sampling the image frames to compress the mixed image comprises: analyzing a dynamic rate of change of the at least one shooting entity in the at least one dynamic image. Sampling the image frames according to the dynamic rate of change to change the fixed frame rate The rate becomes the rate of the change box that is proportional to the rate of dynamic change.

The invention further provides a portable electronic device, comprising: an image recording module and a control unit. The image recording module generates a mixed image for at least one of the shooting entities, wherein the mixed image includes a still image and at least one moving image, and the moving image includes a plurality of image frames and has a fixed frame rate. The control unit shrinks the mixed image by sampling the image frames such that the fixed frame rate becomes a variable frame rate.

In an embodiment of the present invention, the control unit includes: a time-based sampling module for sampling the image frames according to an image capturing time point of the still image, The number of sampling frames of the rate of the change frame is increased as the closer to the image capturing time point.

In an embodiment of the present invention, the portable electronic device, wherein the closer to the image capturing time point, the frame rate is increased from 15 to 20 frames per second to 30 frames per second.

In an embodiment of the present invention, the portable electronic device, wherein the control unit comprises: an analysis module and a dynamic change-based sampling module. The analysis module analyzes a dynamic rate of change of the at least one shooting entity in the at least one dynamic image. The dynamic change is a basic sampling module, and according to the dynamic change rate, the rate of the fixed frame is changed to become the frame rate proportional to the rate of dynamic change.

The present invention further provides an image recording method, which is applicable to a portable electronic device. The image recording method includes: continuously recording at least one shooting entity as a mixed image, wherein the mixed image includes a plurality of moving images and The plurality of still images are interspersed between the motion images, and each of the motion images includes a plurality of image frames and has a fixed frame rate. The mixed image is compressed such that the fixed frame rate of each of the moving images becomes a variable frame rate.

In an embodiment of the present invention, the method for compressing the mixed image includes: sampling the image frames of the moving images to change the fixed frame rate to be closer to the adjacent still image. The more the number of sampling frames, the rate of the change box.

In an embodiment of the present invention, the image recording method, wherein the variable frame rate is between 15 and 30 frames/second.

In an embodiment of the present invention, the image recording method, wherein the compressing the mixed image comprises: analyzing a dynamic rate of change of the at least one shooting entity in each of the moving images. And sampling the image frames of the moving images according to the dynamic rate of change of the at least one shooting entity in each of the moving images to change the fixed frame rate of each of the moving images to become the dynamic rate of change Proportional of the change box rate.

In an embodiment of the present invention, the method for continuously recording the at least one shooting entity as the mixed image comprises: recording the moving image of the at least one shooting entity in a recording mode. Receiving a plurality of image capture signals in sequence, wherein, while receiving each of the image capture signals, switching from the video mode to an image capture mode, and capturing the at least one in the image capture mode Shooting the still image of the entity, and after capturing the still image of the at least one shooting entity, switching the image capturing mode to the recording mode, and capturing the signal in the two images Between the recording modes, the moving images of the at least one shooting entity are continuously recorded.

The invention further provides a portable electronic device, comprising: an image recording module and a control unit. The image recording module continuously records at least one shooting entity as a mixed image, wherein the mixed image includes a plurality of moving images and a plurality of still images, and the static images are respectively interposed between the moving images, and each of the dynamic images The image contains a plurality of image frames and has a fixed frame rate. The control unit compresses the mixed image so that the fixed frame rate of each of the moving images becomes a variable frame rate.

In an embodiment of the present invention, the control unit includes: a time-based sampling module that samples the image frames of the moving images to change the fixed frame rate. The closer to the adjacent still image, the more the number of sampling frames.

In an embodiment of the present invention, the portable electronic device, wherein the variable frame rate is between 15 and 30 frames/second.

In an embodiment of the present invention, the portable electronic device, wherein the control unit comprises: an analysis module and a dynamic change-based sampling module. The analysis module analyzes a dynamic rate of change of the at least one shooting entity in each of the plurality of motion images. The dynamic sampling-based sampling module samples the image frames of the moving images according to the dynamic rate of change of the at least one shooting entity in each of the moving images to change the fixed frame rate of each of the moving images. The rate of the change frame is proportional to the rate of dynamic change.

The invention captures the static image of the real object in the image capturing mode Image, and continuously record the moving image of the shooting entity before and after capturing the still image, so the generated mixed image can not only provide a static image with higher image resolution, but also provide precious before and after capturing the static image. Dynamic images to provide users with more precious memories of the time. In addition, by compressing the mixed image by sampling the image frame of the moving image of the mixed image according to different sampling requirements, the storage space required for storing the mixed image can be greatly saved, and the time required for the user to browse the mixed image can be shortened.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1A is a schematic diagram of a portable electronic device according to an embodiment of the invention. FIG. 2 is a schematic flow chart of an image recording method according to an embodiment of the invention. Referring to FIG. 1A , in the embodiment, the portable electronic device 100 of the present invention includes an image recording module 104 and a control unit 106 . The portable electronic device 100 is, for example, a personal digital assistant (PDA), a PDA mobile phone, a smart phone, a touch mobile phone, a digital camera, or a digital video camera.

Referring to FIG. 1A and FIG. 2, in step S201, the image recording module 104 records at least one mixed image of the shooting body. The mixed image includes at least one moving image and a still image of the shooting body, and the moving image includes a plurality of image frames and has a fixed frame rate.

In an embodiment, when an image recording start signal is received, the image is captured. The recording module 104 starts the recording mode according to the received image recording, starts the recording mode, and starts recording the first moving image of the shooting entity. The first motion image includes a plurality of first image frames (please refer to the first image frames 302a/402a in the first motion image 302/402 of the hybrid image 300/400 in FIGS. 3 and 4). The fixed frame rate mentioned later and mentioned later refers to the continuous generation of a plurality of image frames constituting the dynamic image at a uniform speed during the entire time period of recording the physical entity when the video recording entity becomes a motion image. . Further explained by the concept of time flow, the fixed frame rate means that the image frames constituting the dynamic image are evenly distributed in the entire recording time section in which the dynamic image is generated.

After receiving an image capture signal, the image recording module 104 switches from the recording mode to the image capturing mode to capture a still image of the shooting entity (as shown in FIG. 3 and FIG. 4, statically). Image 304/404). It is worth noting that since the image recording is switched from the recording mode to the image capturing mode, and the still image of the shooting entity is captured in the image capturing mode, the generated still image is more than the first moving image and the subsequent generated moving image. Has a high degree of image resolution.

Then, after capturing the still image of the shooting entity, the image recording module 104 switches from the image capturing mode to the recording mode to continue recording the shooting entity to a second moving image having a second fixed frame rate. The second motion image includes a plurality of second image frames (please refer to the first image frames 306a/406a of the second motion images 306/406 of the hybrid image 300/400 in FIGS. 3 and 4).

Further, the image recording module 104 is based on the received image Switching between the video mode and the image capturing mode, such as capturing a signal, to generate a mixture of a still image, a first motion image before generating the still image, and a second motion image after the static image is generated for the shooting entity Image (please refer to the mixed image 300/400 in Figure 3 and Figure 4). In other words, before the signal receiving module 102 receives the image capturing signal, the image recording module 104 generates a first motion image for the shooting entity video until the signal receiving module 102 receives the image capturing signal. The group 104 is switched from the recording mode to the image capturing mode, and in the image capturing mode, the still image of the shooting entity is captured, and after the static image is generated, the image capturing mode is automatically switched to the recording mode, and the video is recorded. In the mode, the second motion image is continuously generated for the shooting entity.

Then, referring to FIG. 1 and FIG. 2, in step S215, the control unit 106 compresses the mixed image by sampling the image frame of the motion image in the mixed image, so that the original fixed frame rate of the motion image is changed to a variable frame rate. . The control unit 106 is, for example, a processor.

In an embodiment, the control unit 106 adjusts the information capture amount of the mixed image, and compresses the mixed image by sampling the first image frame and/or the second image frame (refer to the mixed image 300/ in FIG. 3 and FIG. 4). 400), changing the first fixed frame rate to a first change frame rate, and/or changing the second fixed frame rate to become a second change frame rate.

FIG. 1B is a schematic diagram of a control unit in a portable electronic device according to an embodiment of the invention. FIG. 3 is a schematic diagram of hybrid image compression according to an embodiment of the invention. Referring to FIG. 1B and FIG. 3, in the embodiment, the control unit 106 includes a time-based sampling module 106a, which is The image capturing time point of the still image is taken, and the image frame of the moving image is sampled, so that the number of sampling frames of the moving frame rate of the sampled moving image increases as the closer to the image capturing time point. That is, the closer to the image capturing time point, the increasing frame rate is gradually increased, for example, the frame rate is gradually increased from 15 to 20 frames per second to 30 frames per second.

In one embodiment, the method of sampling the first image frame and/or the second image frame to compress the mixed image is, for example, a time-based sampling module 106a captures an image based on the image received by the image (ie, Generating an image capture time point of the still image 304, sampling the first image frame 302a of the first motion image 302 and/or the second image frame 306a of the second motion image 306 (step S301) to change the first motion image. The fixed frame rate of 302 becomes closer to the image capturing time point (that is, the time position of the static image 304 in the time stream in which the mixed image is generated), and the first frame rate of the sampling frame is increased (that is, the increasing frame) Rate), and/or change so that the fixed frame rate of the second motion image 306 becomes farther away from the image capturing time point (that is, the time position of the static image 304 in the time stream in which the mixed image is generated), the fewer the number of sampling frames The second change box rate (ie, the decreasing frame rate).

Referring to FIG. 3, before the control unit 106 compresses the mixed image 300, whether it is the first motion image 302 or the second motion image 306, in the time stream in which the mixed image is generated, the first image frame 302a and the second image frame 306a It is evenly distributed before and after the time position at which the still image 304 is generated. However, after the control unit compresses the mixed image 300 (step S301), in the compressed mixed image 300a, the sampled first image frame 302'a in the first dynamic image 302' after sampling is closer to the image capturing time point ( As indicated by arrow 308, That is, in the time stream in which the mixed image is generated, the generation time position of the still image 304) is the number of sampling frames (that is, the number of image frames sampled at a unit time point). On the other hand, in the compressed mixed image 300a, the sampled second image frame 306'a in the second moving image 306' after sampling is farther away from the image capturing time point (as indicated by the arrow 310, that is, the mixing is generated). In the time stream of the image, the time position of the still image 304 is generated, and the number of sampling frames is smaller (that is, the number of image frames sampled at a unit time point is smaller).

FIG. 1C is a schematic diagram of a control unit in a portable electronic device according to another embodiment of the invention. FIG. 4 is a schematic diagram of hybrid image compression according to still another embodiment of the present invention. In another embodiment, the control unit 106 includes an analysis module 106b and a dynamic change to the basic sampling module 106c. The analysis module 106b analyzes the rate of dynamic change of the photographing entity in at least one of the motion images. The dynamic change-based sampling module 106c samples the image frame in the dynamic image according to the dynamic rate of change of the shooting entity, so as to change the fixed frame rate of the dynamic image to a variable frame rate proportional to the dynamic change rate.

In one embodiment, the method of sampling the first image frame and the second image frame to compress the mixed image is, for example, the analysis module 106b analyzing the first dynamic change rate and/or the second dynamic of the captured entity in the first dynamic image 402. The second dynamic rate of change of the captured entity in the image 406. That is, the analysis module 106b analyzes the rate of dynamic change of the shooting entity between the first image frame 402a and/or the rate of dynamic change between the second image frame 406b, wherein the dynamic rate of change is, for example, the rate of change of light and shadow on the shooting entity. , shooting the displacement speed of the entity and the speed of changing the posture.

Thereafter, the dynamic change is the basic sampling module 106c, according to the first dynamic change rate and the second dynamic change rate, to change the first fixed frame rate to be the first change frame rate proportional to the first dynamic change rate, and/or The second fixed frame rate is changed to a second variable frame rate that is proportional to the second dynamic rate of change.

Referring to FIG. 4, before the control unit 106 compresses the mixed image 400, whether it is the first motion image 402 or the second motion image 406, in the time stream in which the mixed image is generated, the first image frame 402a and the second image frame 406a It is evenly distributed before and after the time position at which the still image 404 is generated. However, after the control unit compresses the mixed image 400 (step S215), in the compressed mixed image 400a, the sampled first image frame 402'a located in the time blocks 408 and 410 in the first dynamic image 402' after sampling and The sampled second image frame 406'a of the second motion picture 406' after the sampling is located in the time block 412. Since the rate of change of the shooting entity in the time blocks 408, 410, and 412 is relatively large, the time block 408 is The number of sampling frames of the image frame in 410, 412 is large (that is, the more the number of image frames sampled at a unit time point, that is, the first image frame 402'a and the first time frame 408, 410, and 412 The frame rate of the two image frames 406'a is larger.

On the other hand, in the compressed mixed image 400a, the sampled first motion image 402' is located in the sampled first image frame 402'a and the sampled second motion image 406' other than the time blocks 408 and 410. The sampled second image frame 406'a located outside of the time block 412, because the rate of change of the captured entities in the time blocks 408, 410, and 412 is relatively small, the image blocks in the time blocks 408, 410, and 412 Small number of sampling frames (also That is, the smaller the number of image frames sampled at a unit time point, that is, the frame rate of the first image frame 402'a and the second image frame 406'a other than the time segments 408, 410, and 412 are smaller.

In the above embodiment, the hybrid image generated by the image recording method of the present invention includes a still image and a motion image before and/or after the static image is generated. However, the present invention is not limited thereto, that is, the mixed image of the present invention may be composed of a plurality of moving images and a plurality of still images.

FIG. 5 is a schematic flow chart of an image recording method according to another embodiment of the present invention. Referring to FIG. 1 and FIG. 5, in step S501 of the embodiment, the image recording module 104 continuously records at least one shooting entity as a mixed image. FIG. 6 is a schematic diagram of a mixed image according to still another embodiment of the present invention. Referring to FIG. 6, the mixed image 600 includes a plurality of moving images and a plurality of still images, and the still images are interspersed between the moving images. In the embodiment of FIG. 6, only three motion images 602, 604, and 606 and two still images 608 and 610 are displayed. However, the present invention is not limited thereto, that is, as long as each static image is generated. The mixed image of the present invention may include more than three moving images and two or more still images, after a condition of generating a moving image after or after the generation. In addition, each motion image (eg, motion images 602, 604, and 606 in FIG. 6) includes a plurality of image frames 602a, 604a, and 606a and has a fixed frame rate.

It should be noted that, in an embodiment of the present invention, the method for continuously recording a shooting entity to generate a mixed image is, for example, recording a moving image of a shooting entity in a recording mode. When receiving a plurality of image capturing signals sequentially during recording of the moving image of the shooting entity, each image is received 撷 At the same time, the image recording module 104 switches from the recording mode to the image capturing mode, and in this image capturing mode, captures a still image of the shooting entity. After capturing the still image of the at least one shooting entity, the image recording module 104 switches from the image capturing mode to the recording mode to continuously record between the two image capturing signals in the recording mode. Take a picture of the moving image of the entity.

Thereafter, in step S505, the control unit 106 compresses the mixed image 600 so that the fixed frame rate of each moving image becomes a variable frame rate.

The step of compressing the mixed image is described, for example, in the embodiment shown in FIG. 3, that is, the image frame 602a of the sampling module 106a (FIG. 1B) sampling the motion images 602, 604 and 606 based on the time of the control unit 106. 604a and 606a (step S601 of FIG. 6), to change the fixed frame rate of the dynamic images 602, 604, and 606 to be closer to the adjacent still images 608 and 610, the more the number of sampling frames is, the farther away from the adjacent static The images 608 and 610 have the same frame rate as the number of sampling frames. The change box rate is between 15~30 photo frames/second.

In another embodiment, the step of compressing the mixed image is described in the foregoing embodiment shown in FIG. 4, that is, the analysis module 106b of the control unit 106 analyzes the dynamic change of the shooting entity in each motion image. rate. Thereafter, the dynamic change-based sampling module 106c samples the image frames 602a, 604a, and 606a of the dynamic images 602, 604, and 606 according to the dynamic rate of change of the captured entities in each of the dynamic images 602, 604, and 606 to change each of the images. The fixed frame rate of the dynamic images becomes the variable frame rate proportional to the rate of dynamic change.

In summary, the present invention captures a still image of a real object in the image capturing mode, and continuously records the moving image of the shooting entity before and after capturing the still image, so that the generated mixed image can provide image resolution. The higher static image also provides precious dynamic images before and after capturing the static image, so as to provide users with more precious memories at that time. In addition, according to different sampling requirements (for example, the closer to the static image generation time point, the larger the sampling amount of the image frame, the farther away from the static image generation time point, the smaller the sampling amount of the image frame. For example, the dynamic image change of the sampling result The frame rate is proportional to the dynamic rate of change of the shooting entity in the motion image. The image frame of the motion image of the mixed image is sampled to compress the mixed image, which can greatly save the storage space required for storing the mixed image, and can shorten the user's browsing of the mixed image. The time required.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Portable electronic devices

104‧‧‧Image Recording Module

106‧‧‧Control unit

106a‧‧‧ time-based sampling module

106b‧‧‧Analysis module

106c‧‧‧ Dynamic Change as Basic Sampling Module

S201~S215‧‧‧ Method flow steps

300, 300a, 400, 400a‧‧‧ mixed images

S301, S401, S601‧‧‧ sampling steps

302, 306, 302', 306', 402, 406, 402', 406', 602, 604, 606‧‧‧ motion pictures

302a, 306a, 302'a, 306'a, 402a, 406a, 602a, 604a, 606a‧‧‧ image frames

304, 404, 608, 610‧‧‧ still images

308, 310‧‧‧ arrows

408, 410, 412‧‧‧ time blocks

S501~S505‧‧‧ Method flow steps

FIG. 1A is a schematic diagram of a portable electronic device according to an embodiment of the invention.

FIG. 1B is a schematic diagram of a control unit in a portable electronic device according to an embodiment of the invention.

FIG. 1C is a schematic diagram of a control unit in a portable electronic device according to another embodiment of the invention.

FIG. 2 is a schematic flow chart of an image recording method according to an embodiment of the invention.

FIG. 3 is a schematic diagram of hybrid image compression according to an embodiment of the invention.

FIG. 4 is a schematic diagram of hybrid image compression according to still another embodiment of the present invention.

FIG. 5 is a schematic flow chart of an image recording method according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a mixed image according to still another embodiment of the present invention.

S201~S215‧‧‧ Method flow steps

Claims (17)

An image recording method is applicable to a portable electronic device. The image recording method includes: capturing a mixed image of at least one shooting entity, wherein the mixed image includes at least one moving image and a still image of the at least one shooting entity. And the at least one dynamic image includes a plurality of image frames and has a first frame rate; and compressing the mixed image by sampling the image frames to change the first frame rate to a second frame rate. The image recording method of claim 1, wherein the step of sampling the image frames to compress the mixed image comprises: sampling the image frames according to an image capturing time point of the still image, so that the image frames are The number of one sampling frames of the two frame rate increases as the closer to the image capturing time point. The image recording method according to claim 2, wherein the closer to the image capturing time point, the second frame rate is gradually increased from 15 to 20 frames per second to 30 frames per second. The image recording method of claim 1, wherein the step of sampling the image frames to compress the mixed image comprises: analyzing a dynamic rate of change of the at least one shooting entity in the at least one dynamic image; Dynamically changing the rate, sampling the image frames to change the first frame rate to be the second frame rate proportional to the rate of dynamic change. A portable electronic device includes: An image recording module for generating a mixed image for at least one of the shooting entities, wherein the mixed image includes a still image and at least one moving image, and the moving image includes a plurality of image frames and has a first frame rate; The control unit shrinks the mixed image by sampling the image frames to make the first frame rate a second frame rate. The portable electronic device of claim 5, wherein the control unit comprises: a time-based sampling module for sampling the image frames according to an image capturing time point of the still image, so that the image frames are The number of sampling frames of the second frame rate increases as the closer to the image capturing time point. The portable electronic device of claim 6, wherein the closer to the image capturing time point, the second frame rate is gradually increased from 15 to 20 frames per second to 30 frames per second. The portable electronic device of claim 5, wherein the control unit comprises: an analysis module, analyzing a dynamic rate of change of the at least one shooting entity in the at least one dynamic image; and a dynamic change is The basic sampling module changes the first frame rate to the second frame rate proportional to the dynamic rate of change according to the dynamic rate of change. An image recording method is applicable to a portable electronic device. The image recording method includes: continuously recording at least one shooting entity as a mixed image, wherein the mixing The image includes a plurality of motion images and a plurality of still images, the static images being interspersed between the motion images, and each of the motion images includes a plurality of image frames and having a first frame rate; and compressing the image The images are mixed such that the first frame rate of each of the motion pictures becomes a second frame rate. The image recording method of claim 9, wherein the compressing the mixed image comprises: sampling the image frames of the moving images to change the first frame rate to be closer to the adjacent still image The second frame rate of the number of sampling frames. The image recording method according to claim 10, wherein the second frame rate is between 15 and 30 frames per second. The image recording method of claim 9, wherein the compressing the mixed image comprises: analyzing a dynamic change rate of the at least one shooting entity in each of the moving images; and according to each of the moving images The dynamic rate of change of the at least one shooting entity, sampling the image frames of the moving images to change the first frame rate of each of the moving images to be the second frame proportional to the dynamic rate of change rate. The image recording method of claim 9, wherein the step of continuously recording the at least one shooting entity as the mixed image comprises: recording the dynamic image of the at least one shooting entity in a recording mode; Receiving a plurality of image capture signals in sequence, wherein, while receiving each of the image capture signals, switching from the video mode to an image capture mode, and capturing the at least one in the image capture mode Shooting the still image of the entity, and after capturing the still image of the at least one shooting entity, switching the image capturing mode to the recording mode, and between the two image capturing signals, in the recording mode And continuously recording the moving images of the at least one shooting entity. A portable electronic device includes: an image recording module, continuously recording at least one shooting entity as a mixed image, wherein the mixed image includes a plurality of moving images and a plurality of still images, and the static images are respectively inserted into the images Between the dynamic images, each of the dynamic images includes a plurality of image frames and has a first frame rate; and a control unit compresses the mixed images such that the first frame rate of each of the moving images becomes A second box rate. The portable electronic device of claim 14, wherein the control unit comprises: a time-based sampling module, sampling the image frames of the moving images to change the first frame rate to become The second frame rate of the number of sampling frames is closer to the adjacent still image. The portable electronic device of claim 15, wherein the second frame rate is between 15 and 30 frames per second. The portable electronic device of claim 14, wherein the control unit comprises: An analysis module, configured to analyze a dynamic rate of change of the at least one shooting entity in each of the motion images; and a dynamic change as a base sampling module, according to the dynamic of the at least one shooting entity in each of the motion images Rate of change, sampling the image frames of the dynamic images to change the first frame rate of each of the dynamic images to be the second frame rate proportional to the rate of dynamic change.