JP4446288B2 - Movie recording apparatus and movie recording processing program - Google Patents

Description

  The present invention relates to a moving image recording apparatus and a moving image recording processing program suitable for use in, for example, a digital camera or a digital video camera.

  In a digital camera or a digital video camera having a moving image shooting function, a moving image is compressed and encoded in real time using a motion compensation interframe predictive coding technique and recorded. In the inter-frame predictive coding technique, the compression rate is successfully increased by performing motion compensation. On the other hand, motion vector detection for that purpose places a load on the CPU, which increases power consumption and shortens battery life. It is a cause. In particular, when camera shake occurs in the captured image, parallel movement and rotation occur in the entire captured image, and the amount of calculation for motion vector search increases, resulting in significant battery consumption.

  As a technique for realizing efficient encoding by reducing an increase in the amount of calculation due to camera shake, for example, in Patent Document 1, a motion direction and a motion amount of an imaging unit are detected using an acceleration sensor, and motion compensation is performed accordingly. An apparatus for moving a motion compensation range when performing inter-frame prediction is disclosed.

JP 2004-56578 A

  By the way, the apparatus disclosed in Patent Document 1 merely reduces an increase in the amount of calculation due to camera shake. For example, when the battery capacity is low or when there is little camera shake, encoding is performed so as to suppress power consumption. In addition, there is a problem that it is impossible to record a moving image in consideration of the remaining battery level.

  Therefore, the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a moving image recording apparatus and a moving image recording processing program capable of performing moving image recording in consideration of camera shake and remaining battery level.

  In order to achieve the above object, according to the first aspect of the present invention, the remaining amount detecting means for detecting the remaining battery level, the shaking detection means for detecting the amount of camera shake, and the remaining battery level detected by the remaining amount detecting means. And an instruction means for instructing a compression mode determined according to the amount of camera shake detected by the camera shake detection means, and a recording means for recording a moving image by compressing and encoding the captured image in accordance with the compression mode instructed by the instruction means It is characterized by comprising.

The invention according to claim 2, which is dependent on claim 1, is characterized in that the compression mode is an operation speed of interframe predictive coding and a search limit in motion vector detection.

The invention according to claim 3 that depends on claim 2 is characterized in that the search limit is at least one of a search range and the number of trials.

In the invention according to claim 4 dependent on claim 1, the instruction means has a plurality of threshold values for determining the amount of camera shake detected by the camera shake detection means, and corresponds to the amount of camera shake exceeding the threshold value. Thus, the compression mode is changed.

In the invention according to claim 5 subordinate to claim 1, the instruction means has a plurality of threshold values for determining the amount of camera shake detected by the camera shake detection means, and these threshold values are determined by the remaining amount detection means. It changes according to the battery remaining amount detected.

In the invention according to claim 6 that is dependent on claim 1, the instruction means has a plurality of threshold values for determining the amount of camera shake detected by the camera shake detection means, and variably sets the threshold values by a user operation. Threshold setting means is provided.

In the invention according to claim 7, which is dependent on claim 1, the instruction means reduces the operation speed of the inter-frame predictive encoding when the remaining battery level detected by the remaining quantity detection means is less than a predetermined value. And the recording means is instructed to narrow the search limit in motion vector detection.

In the invention according to claim 8, which is dependent on claim 1, the instruction means detects the amount of camera shake detected by the camera shake detection means when the battery remaining amount detected by the remaining capacity detection means has a predetermined amount. If it is within the range where motion compensation is possible, the recording means is instructed to increase the operation speed of inter-frame predictive coding and widen the search limit in motion vector detection.

In the invention according to claim 9 that is dependent on claim 1, the instruction means detects the amount of camera shake detected by the camera shake detection means when the battery remaining amount detected by the remaining capacity detection means has a predetermined amount. If it is outside the range where motion compensation is possible, the recording means is instructed to reduce the operation speed of inter-frame predictive coding and to narrow the search limit in motion vector detection.

According to a tenth aspect of the present invention, the remaining amount detection process for detecting the remaining battery level, the camera shake detection process for detecting the amount of camera shake, the remaining battery level detected by the remaining amount detection process, and the camera shake detection process are detected. An instruction process for instructing a compression form determined according to the amount of camera shake to be performed, and a recording process for recording a moving image by compressing and encoding the captured image according to the compression form instructed in the instruction process are executed by a computer It is characterized by that.

  According to the first and tenth aspects of the present invention, the remaining battery level and the amount of camera shake are detected, and the captured image is compressed and encoded in accordance with a compression mode determined according to the detected remaining battery level and the amount of camera shake. Therefore, moving image recording can be performed in consideration of camera shake and remaining battery level.

  According to the seventh aspect of the invention, when the remaining battery level is less than the predetermined value, the operation speed of the inter-frame predictive encoding is instructed to be reduced and the motion vector search range is narrowed, resulting in image quality deterioration. Video recording with reduced battery consumption can be performed.

  According to the eighth aspect of the present invention, when the amount of camera shake detected when the remaining battery level is within a predetermined range, the operation speed of inter-frame predictive coding is increased, and the motion vector Since an instruction is given to widen the search range, moving image recording with priority on image quality can be performed at the expense of battery life.

  According to the ninth aspect of the present invention, when the amount of camera shake detected when the battery remaining amount is a predetermined amount is out of the range capable of motion compensation, the operation speed of inter-frame predictive encoding is reduced, and the motion vector Since the search range is instructed to be narrowed, moving image recording can be performed with reduced battery consumption at the expense of image quality.

Embodiments of the present invention will be described below with reference to the drawings.
A. Configuration (1) Overall Configuration FIG. 1 is a block diagram showing a schematic configuration of a digital camera according to an embodiment including a moving image recording apparatus according to the present invention. In this figure, the operation unit 10 has various operation keys such as a power switch and a shutter key, generates a key event corresponding to the key operation, and supplies it to the control unit 13. The acceleration sensor 11 is composed of, for example, a piezoresistive element or the like, and detects and outputs camera shake during photographing. The power supply unit 12 includes a DC / DC converter, converts the battery voltage into a drive voltage to be supplied to each unit, outputs the drive voltage to the respective units, detects the remaining battery level, and outputs it to the control unit 13.

  The control unit 13 includes a CPU and the like, and generates a control signal for controlling each unit in accordance with a key event input from the operation unit 10. In addition, the control unit 13 executes a shooting operation control process (see FIG. 3) described later during moving image shooting, and takes into account the remaining battery level supplied from the power supply unit 12 and camera shake detected by the acceleration sensor 11. To the image encoding unit 15. The imaging unit 14 has an optical system including a photographing lens group and a shutter mechanism, and a color image sensor such as a CCD that captures a subject image and generates a color image signal at a predetermined frame period, and is obtained by imaging. The image signal is converted into image data composed of a luminance component and a color difference component and output.

  The image encoding unit 15 compresses and encodes a moving image (a series of image data) input from the imaging unit 14 using an inter-frame predictive encoding method, and a schematic configuration thereof will be described later. Further, the image encoding unit 15 changes the operation clock in accordance with an instruction from the control unit 13 so as to widen or narrow the motion vector search range in the motion vector detection unit 107 described later. The image storage unit 16 stores the encoded data output from the image encoding unit 15 as a moving image file under the control of the control unit 13. The image decoding unit 17 decodes the moving image file stored in the image storage unit 16 according to an instruction from the control unit 13 and outputs moving image data. The display unit 18 displays the moving image data generated by the image decoding unit 17 on the screen under the control of the control unit 13.

(2) Configuration of Image Encoding Unit 15 FIG. 2 is a block diagram showing a schematic configuration of the image encoding unit 15. In this figure, a subtracter 100 generates a prediction error signal representing a luminance difference by subtracting the pixel value of the prediction block from the pixel value of the current block. The transform / quantization unit 101 performs integer DCT (Discrete Cosine Transform) on the prediction error signal output from the subtracter 100, and quantizes the transform coefficient obtained thereby with a predetermined quantization width to generate coefficient data. . The entropy coding unit 102 uses an exponential Golomb code based on the variable length coding VLC and a CABAC (Context-based Adaptive Binary Arithmetic Coding) applied to the coefficient data generated by the transform / quantization unit 101. Encoded data that has been entropy-encoded is generated.

  The inverse quantization / inverse transform unit 103, the adder 104, the loop filter 105, and the frame memory 106 form a local decoding unit. The local decoding unit performs inverse quantization and inverse integer DCT on the coefficient data generated by the transform / quantization unit 101, adds the pixel value of the previous prediction block to the coefficient data, generates a decoded image, and generates the generated decoding The image is subjected to loop filtering to reduce block noise, and then temporarily stored in the frame memory 106. The motion detector 107 detects the motion vector of the current block.

The motion detection unit 107 widens or narrows the motion vector search range in accordance with an instruction from the control unit 13. The motion compensation unit 108 performs motion compensation on the reference frame (the decoded image read from the frame memory 106) according to the motion vector of the current block detected by the motion detection unit 107, and calculates an inter-frame prediction block value. According to such a configuration, the moving image is compressed by inter-frame coding using the correlation in the time domain, and the compression rate changes according to the amount of camera shake and the remaining battery level.

B. Operation Next, the operation of the photographing operation control process executed by the control unit 13 will be described with reference to FIG. In the digital camera having the above-described configuration, when the mode for moving image shooting is set, the control unit 13 proceeds to step SA1 shown in FIG. 3, and each of the registers BP1, BP2, SH1 to SH3 has predetermined threshold values (described later). Is initialized or the registers CK and SR are reset. Subsequently, in Step SA2, it is determined whether or not the remaining battery level supplied from the power supply unit 12 is smaller than a threshold stored in the register BP1 (hereinafter referred to as threshold BP1). If the remaining battery level of the power supply unit 12 is smaller than the threshold value BP1, the determination result is “YES”, the process proceeds to step SA3, “L” is set in the register CK, “S” is set in the register SR, and this process is finished. .

Here, “L” set in the register CK indicates that the operation clock of the image encoding unit 15 is set to a low speed. “S” set in the register SR represents that the motion vector search range of the motion detection unit 107 in the image encoding unit 15 is narrowed.
Therefore, when the remaining battery level of the power supply unit 12 is smaller than the threshold value BP1, the image encoding unit 15 sets the operation clock to a low speed and reduces the motion vector search range in accordance with an instruction from the control unit 13 to reduce power consumption. Plan. As a result, moving image recording with reduced battery consumption at the expense of image quality is performed.

  On the other hand, if the remaining battery level of the power supply unit 12 is greater than the threshold value BP1, the determination result of step SA2 is “NO”, and the process proceeds to step SA4. In step SA4, it is determined whether or not the remaining battery level supplied from the power supply unit 12 is larger than a threshold value stored in the register BP2 (hereinafter referred to as threshold value BP2). If the remaining battery level is larger than the threshold BP2, the determination result is “YES”, and after adding a predetermined value α to each threshold of the registers SH1 to SH3 and increasing the thresholds SH1 to SH3 for determining the amount of camera shake The process proceeds to step SA6.

  On the other hand, when the remaining battery level is smaller than the threshold BP2, the determination result in step SA4 is “NO”. In this case, the thresholds SH1 to SH3 set as the initial values in step SA1 are set. Step SA6 and subsequent steps are executed. The threshold values SH1 to SH3 are in a relationship of SH1 <SH2 <SH3.

  Next, in step SA6, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH1. If the amount of camera shake is smaller than the threshold value SH1, the determination result is “YES”, the process proceeds to step SA7, “L” is set in the register CK, and “S” is set in the register SR, and this process is terminated.

  Therefore, if the amount of camera shake is smaller than the threshold value SH1, the image encoding unit 15 sets the operation clock to a low speed and narrows the motion vector search range in accordance with an instruction from the control unit 13. In other words, low camera shake means that there is little image motion, and optimal motion vector detection is possible even if the search range of motion vectors is narrowed.In this case, video recording with reduced battery consumption without causing image quality degradation is possible. Do.

  On the other hand, if the amount of camera shake is larger than the threshold value SH1, the determination result in step SA6 is “NO”, and the flow proceeds to step SA8. In step SA8, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH2. If the amount of camera shake is smaller than the threshold value SH2, the determination result is “YES”, the process proceeds to step SA9, “M” is set in the register CK, “M” is set in the register SR, and this process is terminated.

  Here, “M” set in the register CK indicates that the operation clock of the image encoding unit 15 is set to a medium speed. Further, “M” set in the register SR represents that the motion vector search range of the motion detection unit 107 in the image encoding unit 15 is set to the middle. Therefore, if the amount of camera shake is smaller than the threshold value SH2, the image encoding unit 15 sets the operation clock to the medium speed and sets the motion vector search range to the middle according to the instruction of the control unit 13, so that the optimal motion vector Detection is possible.

  On the other hand, if the amount of camera shake is larger than the threshold value SH2, the determination result in step SA8 is “NO”, and the process proceeds to step SA10. In step SA10, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH3. If the amount of camera shake is smaller than the threshold value SH3, the determination result is “YES”, the process proceeds to step SA11, “H” is set in the register CK, “L” is set in the register SR, and the present process is terminated.

  Here, “H” set in the register CK indicates that the operation clock of the image encoding unit 15 is increased. Further, “L” set in the register SR represents that the motion vector search range of the motion detection unit 107 in the image encoding unit 15 is expanded. Therefore, if the amount of camera shake is smaller than the threshold value SH3, the image encoding unit 15 sets the operation clock at high speed and widens the motion vector search range in accordance with an instruction from the control unit 13. As a result, although the power consumption is increased, moving image recording is performed without image quality deterioration.

  On the other hand, if the amount of camera shake is larger than the threshold value SH3, the determination result in Step SA10 is “NO”, and the process proceeds to Step SA12. In step SA12, "L" is set in the register CK and "S" is set in the register SR, and this process is finished. Therefore, when the amount of camera shake is larger than the threshold value SH3, the image encoding unit 15 sets the operation clock to a low speed and narrows the motion vector search range in accordance with an instruction from the control unit 13. In other words, in a state where camera shake is too high to compensate for motion, even if the motion vector search range is widened, optimal motion vector detection cannot be expected.Therefore, the operation clock is set to a low speed and the motion vector search range is reduced. Narrow down to reduce power consumption. As a result, moving image recording is performed with reduced battery consumption at the expense of image quality.

  As described above, in the present embodiment, the operation clock and the motion vector search range of the image encoding unit 15 are changed according to the remaining battery level of the power supply unit 12 and the amount of camera shake detected by the acceleration sensor 11. Thus, “video recording with reduced battery consumption without incurring image quality degradation”, “video recording with priority on image quality at the expense of battery life” and “video recording with reduced battery consumption at the expense of image quality” are performed.

  That is, when the battery of the power supply unit 12 is low, the operation clock of the image encoding unit 15 is set to a low speed, and the search range of the motion vector is narrowed to reduce power consumption. Record video with reduced image quality. Even when a small amount of camera shake occurs when the battery level of the power supply unit 12 is a predetermined amount, the operation clock of the image encoding unit 15 is set to a low speed and the search range of the motion vector is narrowed. In this case, since the motion of the image is small and the optimum motion vector can be detected even if the search range of the motion vector is narrowed, moving image recording with reduced battery consumption can be performed without causing image quality deterioration.

  Further, when a large amount of camera shake that can be compensated for motion occurs when the battery level of the power supply unit 12 has a predetermined amount, the operation clock of the image encoding unit 15 is set at a high speed, and the motion vector search range is expanded. Record video with priority on image quality at the expense of battery life. In addition, when a large amount of camera shake that cannot be compensated for motion occurs when the battery level of the power supply unit 12 has a predetermined amount, optimal motion vector detection cannot be expected even if the motion vector search range is widened. The operation clock is set to a low speed, the motion vector search range is narrowed to reduce power consumption, and moving image recording is performed with reduced battery consumption at the expense of image quality. As a result, moving image recording can be performed in consideration of camera shake and the remaining battery level.

In the above-described embodiment, the threshold values SH1 to SH3 for determining the amount of camera shake are changed according to whether or not the remaining battery level of the power supply unit 12 is sufficient. The threshold values SH1 to SH3 may be variably set. In this way, a user-preferred moving image recording mode can be selected.
Furthermore, it is possible to continuously vary the threshold values SH1 to SH3 in accordance with the remaining battery level of the power supply unit 12 that changes with time. A moving image recording mode adapted to the remaining amount and the amount of camera shake can be automatically set.

C. Other Embodiments Next, with reference to FIG. 4, an operation of a shooting operation control process according to another embodiment will be described. 4 is different from the above-described embodiment (see FIG. 3) in that the motion vector search range is changed to the number of motion vector search trials.

  That is, in other embodiments, when the mode for shooting a moving image is set, the control unit 13 proceeds to step SB1 shown in FIG. 4 and sets predetermined thresholds (described later) in registers BP1, BP2, SH1 to SH3. ) Or reset the registers CK and RL. Subsequently, in step SB2, it is determined whether or not the remaining battery level supplied from the power supply unit 12 is smaller than a threshold stored in the register BP1 (hereinafter referred to as threshold BP1). If the remaining battery level of the power supply unit 12 is smaller than the threshold value BP1, the determination result is “YES”, the process proceeds to step SB3, “L” is set in the register CK, “S” is set in the register RL, and this process ends. .

  Here, “L” set in the register CK indicates that the operation clock of the image encoding unit 15 is set to a low speed. “S” set in the register RL represents that the number of trials of motion vector search of the motion detection unit 107 in the image encoding unit 15 is reduced.

  Therefore, when the remaining battery level of the power supply unit 12 is smaller than the threshold value BP1, the image encoding unit 15 sets the operation clock to a low speed and reduces the number of motion vector search trials according to the instruction from the control unit 13. To reduce As a result, moving image recording is performed with reduced battery consumption at the expense of image quality.

  On the other hand, if the remaining battery level of the power supply unit 12 is greater than the threshold value BP1, the determination result in step SB2 is “NO”, and the process proceeds to step SB4. In step SB4, it is determined whether or not the remaining battery level supplied from the power supply unit 12 is larger than a threshold value stored in the register BP2 (hereinafter referred to as threshold value BP2). If the remaining battery level is larger than the threshold BP2, the determination result is “YES”, and after adding a predetermined value α to each threshold of the registers SH1 to SH3 and increasing the thresholds SH1 to SH3 for determining the amount of camera shake The process proceeds to step SB6.

  On the other hand, if the remaining battery level is smaller than the threshold value BP2, the determination result in step SB4 is “NO”. In this case, the threshold values SH1 to SH3 set as initial values in step SB1 are used. Step SB6 and subsequent steps are executed. The threshold values SH1 to SH3 are in a relationship of SH1 <SH2 <SH3.

  Next, in step SB6, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH1. If the amount of camera shake is smaller than the threshold value SH1, the determination result is “YES”, the process proceeds to step SB7, “L” is set in the register CK, and “S” is set in the register RL, and this process ends.

  Therefore, when the amount of camera shake is smaller than the threshold value SH1, the image encoding unit 15 sets the operation clock to a low speed and decreases the number of motion vector search trials according to the instruction of the control unit 13. In other words, low camera shake means that there is little image motion, and optimal motion vector detection is possible even if the number of motion vector search attempts is reduced, so in this case, a moving image with reduced battery consumption without causing image quality degradation. Make a record.

  On the other hand, if the amount of camera shake is larger than the threshold value SH1, the determination result in step SB6 is “NO”, and the flow proceeds to step SB8. In step SB8, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH2. If the amount of camera shake is smaller than the threshold value SH2, the determination result is “YES”, the process proceeds to step SB9, “M” is set in the register CK, “M” is set in the register RL, and this process is terminated.

  Here, “M” set in the register CK indicates that the operation clock of the image encoding unit 15 is set to a medium speed. “M” set in the register RL indicates that the number of trials of motion vector search of the motion detection unit 107 in the image encoding unit 15 is set to the middle. Therefore, if the amount of camera shake is smaller than the threshold value SH2, the image encoding unit 15 sets the operation clock to a medium speed and sets the number of trials of motion vector search to the medium according to the instruction of the control unit 13. Vector detection becomes possible.

  On the other hand, if the amount of camera shake is larger than the threshold value SH2, the determination result in step SB8 is “NO”, and the flow proceeds to step SB10. In step SB10, it is determined whether or not the amount of camera shake detected by the acceleration sensor 11 is smaller than the threshold value SH3. If the amount of camera shake is smaller than the threshold value SH3, the determination result is “YES”, the process proceeds to step SB11, “H” is set in the register CK, and “L” is set in the register RL, and this process is finished.

  Here, “H” set in the register CK indicates that the operation clock of the image encoding unit 15 is increased. Further, “L” set in the register RL indicates that the number of trials of motion vector search of the motion detection unit 107 in the image encoding unit 15 is increased. Therefore, when the amount of camera shake is smaller than the threshold value SH3, the image encoding unit 15 sets the operation clock at a high speed and increases the number of trials of motion vector search in accordance with an instruction from the control unit 13. As a result, although the power consumption increases, moving image recording is performed without image quality deterioration.

  On the other hand, if the amount of camera shake is greater than the threshold value SH3, the determination result in step SB10 is “NO”, and the flow proceeds to step SB12. In step SB12, "L" is set in the register CK and "S" is set in the register RL, and this process is finished. Therefore, when the amount of camera shake is larger than the threshold value SH3, the image encoding unit 15 sets the operation clock to a low speed and decreases the number of motion vector search attempts in accordance with an instruction from the control unit 13. In other words, in the state where camera shake that cannot compensate for motion has occurred, optimal motion vector detection cannot be expected even if the number of motion vector search attempts is increased, so the operation clock is set to a low speed and motion vector search is performed. Reduce the number of trials to reduce power consumption. As a result, moving image recording is performed with reduced battery consumption at the expense of image quality.

  In the other embodiments described above, the operation clock of the image encoding unit 15 and the number of motion vector search attempts are changed according to the remaining battery level of the power supply unit 12 and the amount of camera shake detected by the acceleration sensor 11. "Video recording with reduced battery consumption without incurring image quality degradation", "Video recording with priority on image quality at the expense of battery life" and "Video recording with reduced battery consumption at the expense of image quality" However, instead of this, any one of these moving image recording modes may be selected by a user operation in accordance with the amount of camera shake and the remaining battery level.

In this specification, “degradation of image quality” is described as an inconvenience when motion compensation is insufficient. However, this is originally a case where the code amount is to be kept constant, and the image quality is reduced. Needless to say, if it is kept constant, it will appear as a defect of "increase in code amount".

It is a block diagram which shows the whole structure of one Embodiment by this invention. 3 is a block diagram illustrating a schematic configuration of an image encoding unit 15. FIG. It is a flowchart which shows operation | movement of imaging | photography operation control processing. It is a flowchart which shows the operation | movement of the imaging | photography operation control process by other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Operation part 11 Acceleration sensor 12 Power supply part 13 Control part 14 Imaging part 15 Image encoding part 16 Image memory | storage part 17 Image decoding part 18 Display part

Claims (10)

A battery level detection means for detecting the battery level;
Camera shake detection means for detecting the amount of camera shake;
Indicating means for instructing a compression mode determined according to the remaining battery level detected by the remaining amount detecting means and the amount of camera shake detected by the camera shake detecting means;
A moving image recording apparatus comprising: a recording unit that compresses and encodes a captured image according to a compression mode instructed by the instruction unit and records the moving image. 2. The moving picture recording apparatus according to claim 1, wherein the compression mode is an operation speed of inter-frame predictive coding and a search limit in motion vector detection. The moving image recording apparatus according to claim 2, wherein the search limit is at least one of a search range and the number of trials. The said instruction | indication means has several threshold value which determines the amount of camera shake detected by the said camera shake detection means, The compression mode is changed according to the amount of camera shake exceeding these threshold values. Video recording device. The instructing unit has a plurality of thresholds for determining the amount of camera shake detected by the camera shake detecting unit, and changes the thresholds according to the remaining battery level detected by the remaining amount detecting unit. The moving image recording apparatus according to claim 1. The said instruction | indication means has a some threshold value which determines the amount of camera shake detected by the said camera shake detection means, The threshold value setting means which variably sets these threshold values by user operation is characterized by the above-mentioned. Movie recording device. The instruction means, when the battery remaining amount detected by the remaining amount detecting means is less than a predetermined value, the operation speed of inter-frame predictive encoding is reduced, and the search limit in motion vector detection is reduced. The moving image recording apparatus according to claim 1, wherein the recording unit is instructed. The instruction means performs inter-frame predictive encoding when the amount of camera shake detected by the camera shake detection means is within a motion-compensable range when the battery remaining amount detected by the remaining capacity detection means is a predetermined amount. 2. The moving image recording apparatus according to claim 1, wherein the recording unit is instructed to increase the operation speed and to widen a search limit in motion vector detection. When the battery remaining amount detected by the remaining amount detecting unit is a predetermined amount and the amount of camera shake detected by the camera shake detecting unit is outside a motion compensation range, the instruction unit performs inter-frame prediction encoding. 2. The moving image recording apparatus according to claim 1, wherein the recording means is instructed to reduce the operation speed and to narrow a search limit in motion vector detection. A battery level detection process for detecting the battery level;
Camera shake detection processing for detecting the amount of camera shake;
An instruction process for instructing a compression mode determined according to a remaining battery level detected by the remaining capacity detection process and an amount of camera shake detected by the camera shake detection process;
A moving image recording processing program that causes a computer to execute a recording process of compressing and encoding a captured image and recording a moving image in accordance with a compression mode instructed in the instruction processing.

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