JP2010226567A - Moving image encoding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome disadvantage in the conventional art in which it is necessary to impose limitations on imaging systems in photography, such as photographic image sizes or imaging time for continuous photographing operation, during high frame rate (FR) photography which causes a larger amount of processing per unit time in an imaging device as compared with ordinary FR photography. <P>SOLUTION: In a moving image encoding device including an encoder for encoding a moving image signal obtained by photography, the encoder changes encoding conditions of the moving image signal according to the frame rate by which the moving image signal is obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and method for compressing and encoding a moving image, and more particularly to a method for encoding moving images acquired at a plurality of frame rates.

  In recent years, in a digital still camera and a digital video camera, in addition to imaging at a normal frame rate (hereinafter referred to as normal FR), it has become possible to perform imaging at a high frame rate (hereinafter referred to as high FR). . The normal FR is a frame rate used in television broadcasting and is set from 30 fps to 60 fps. On the other hand, the high FR indicates a frame rate higher than the normal FR, and specifically indicates a frame rate of 120 fps or more per second.

Conventionally, as a technique for performing imaging using normal FR and high FR, there is a method of switching between normal FR and high FR during imaging (for example, see Patent Document 1). This Patent Document 1 discloses a technique for switching to a high FR particularly when imaging is performed with a normal FR.
JP 2006-325881 A

  In the imaging using the high FR as described above, the processing amount per unit time in the imaging apparatus is larger than that in the normal FR imaging. For this reason, when performing high-FR imaging, it is necessary to limit the imaging method at the time of imaging, for example, the image size at the time of imaging, the imaging time that can be continuously imaged, and the like.

  Accordingly, the present invention solves the above-described problems and captures a subject without restricting the imaging method even when imaged at a high FR, and a moving image signal obtained by encoding the moving image signal can be encoded. An object is to provide an image encoding device.

  In order to achieve the above object, the present invention provides a moving picture coding apparatus for coding a moving picture signal having a plurality of pictures, and a reference picture generated based on an already coded picture. An inter-screen prediction that generates a prediction image using a pixel obtained by decoding an encoded macroblock in a picture to be encoded, and an inter-screen prediction that generates a prediction image from the reference image A prediction image generation unit that generates a prediction image corresponding to a macroblock to be encoded using one of the prediction methods, and encoding the moving image signal based on the prediction image, An encoding unit that generates encoded data, and a control unit that controls the prediction image generation unit, wherein the control unit generates the prediction image according to a frame rate at which the moving image signal is captured. And setting a prediction method to be applied in the.

  According to the present invention, by appropriately setting the encoding condition when changing the frame rate of the captured moving image signal, it is possible to encode the captured moving image signal without changing the imaging method. There is an effect.

  In Embodiment 1 of the present invention, a moving picture coding apparatus for coding a moving picture signal having a plurality of pictures, which stores a reference picture generated based on an already coded picture And intra-screen prediction for generating a predicted image using pixels obtained by decoding a macroblock that has been encoded in a picture to be encoded, and inter-screen prediction for generating a predicted image from the reference image Using one prediction method, a prediction image generation unit that generates a prediction image corresponding to a macroblock to be encoded, and encoding the moving image signal based on the prediction image, An encoding unit that generates the control unit, and a control unit that controls the prediction image generation unit. The control unit controls the prediction image generation unit according to a frame rate at which the moving image signal is captured. It has a configuration and sets the prediction mode applicable Te.

  With the above configuration, by appropriately setting the encoding condition when changing the frame rate of the captured moving image signal, it is possible to encode the captured moving image signal without changing the imaging method. Play.

  In addition, when the moving image signal is captured at a second frame rate that is faster than the first frame rate, the control unit included in the moving image encoding device captures an image at the second frame rate. The predicted image generation unit may be configured to generate the predicted image to be applied to the moving image signal using the intra prediction.

  With this configuration, the prediction method for generating a prediction image to be applied when imaging at a high-speed second frame rate can be limited to in-screen prediction. The processing amount can be reduced.

  The moving image encoding device further includes an imaging unit that captures the moving image signal, and a frame rate setting unit that sets a frame rate when the imaging unit captures an image. In the middle of encoding, when the control unit sets the frame rate in the imaging unit to a second frame rate that is faster than the first frame rate, the control unit You may make it the structure provided with the characteristic which controls the said prediction image production | generation part so that the said prediction image corresponding to an uncoded macroblock among the macroblocks which a picture has may be produced | generated using intra prediction.

  With this configuration, the prediction method for generating a prediction image can be limited to in-screen prediction at the time when the frame rate is switched even in the middle of encoding. It becomes possible to reduce the processing amount of the whole encoding apparatus.

  In addition, while the moving image encoding apparatus is encoding a picture, the control unit causes the frame rate setting unit to change the frame rate in the imaging unit to a second frame rate that is faster than the first frame rate. After setting, when generating the predicted image corresponding to an uncoded macroblock among the macroblocks of the picture being encoded, using inter-screen prediction, the reference image in the inter-screen prediction You may make it the structure provided with the characteristic which controls the said prediction image generation part so that a reference structure may be restrict | limited.

  Further, the control unit controls the prediction image generation unit to use, as the reference image, a picture temporally closest to a picture having a macroblock to be encoded among the already encoded pictures. You may make it the characteristic structure.

  Further, the control unit controls the prediction image generation unit to use, as the reference image, a picture that is most referenced by an already encoded macroblock among macroblocks included in a picture to be encoded. You may make it the structure provided.

  With the configuration described above, it is possible to reduce the processing amount for selecting a reference image, and as a result, it is also possible to reduce the processing amount of the entire moving image coding apparatus.

  In addition, the moving image encoding apparatus includes a plurality of recording units that record the encoding information for each frame rate, and the plurality of recording units are different recording media for each frame rate. You may make it a structure.

  In addition, the moving image encoding apparatus further includes a control unit that controls the storage unit, the storage unit stores the captured moving image signal and the reference image, and the encoding unit includes: The video signal stored in the storage unit is encoded, and the control unit generates the predicted image using inter-screen prediction in the encoding unit of the recording area of the storage unit. The recording area may be controlled so that an area in which a reference image that is not referred to is accumulated is opened and the captured moving image signal is accumulated in the opened area.

  By configuring as described above, it is possible to increase the buffer for storing moving image signals obtained by imaging without increasing the circuit scale, and to capture and capture the subject without limiting the imaging method. There is an effect that the obtained moving image signal can be encoded.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a video camera 10 according to Embodiment 1 of the present invention. The video camera 10 includes a moving image encoding device 100 and an imaging unit 200.

  The moving image encoding apparatus 100 performs encoding of a moving image signal generated in the imaging unit 200 and recording of encoded data obtained by encoding. Furthermore, the moving image encoding apparatus 100 changes the setting of the frame rate when the imaging unit 200 captures an object.

  The imaging unit 200 captures a target subject based on the frame rate set by the video encoding device 100, and generates a video signal. The generated moving image signal is output to the moving image encoding apparatus 100.

  Furthermore, the moving image encoding apparatus 100 includes a frame rate setting unit 101, an encoding unit 102, a recording unit 103, a storage unit 104, and a control unit 105. In the first embodiment, the moving image signal captured by the imaging unit 200 is temporarily accumulated in the accumulation unit 104, and the encoding unit 102 reads out the moving image signal accumulated in the accumulation unit 104 for each picture, Coding is performed in units of macroblocks included in a picture.

  The frame rate setting unit 101 sets a frame rate when the imaging unit 200 images a subject. The frame rate setting can be changed at any timing such as when a change instruction is received from the user. Further, the frame rate setting unit 101 notifies the control unit 105 of frame rate information (hereinafter referred to as FR information) set by the imaging unit 200. For example, when the frame rate is changed, the changed FR information is notified to the control unit 105. Furthermore, when the imaging unit 200 starts imaging, the control unit 105 is notified of FR information preset in the imaging unit 200.

  The encoding unit 102 encodes the moving image signal generated in the imaging unit 200. Then, the encoded data obtained by encoding is output to the recording unit 103. Note that when encoding a moving image signal, for example, H.264 using intra prediction or inter prediction. It is assumed that encoding is performed using an encoding standard such as H.264 / AVC.

  The recording unit 103 stores the encoded data output from the encoding unit 102. The recording unit 103 includes a recordable unit such as a flash memory, a DRAM, or a ferroelectric memory.

  The accumulation unit 104 accumulates the moving image signal output from the imaging unit 200. The storage unit 104 is composed of a recordable medium such as a flash memory, a DRAM, or a ferroelectric memory.

  The control unit 105 controls the entire moving image encoding apparatus 100. Specifically, when the FR information is notified from the frame rate setting unit 101, a control signal for setting a prediction method to be applied in the encoding process is output to the encoding unit 102. For example, when the preset FR information is a frame rate of less than 240 fps, a control signal using inter-screen prediction and intra-screen prediction is output, and when the frame rate is 240 fps or higher, a control signal using intra-screen prediction is output. To do. Note that in the case of a frame rate of 240 fps or higher, a control signal using inter-screen prediction and intra-screen prediction in which the use of a reference image is restricted may be output to the encoding unit 102.

  Next, the encoding unit 102 will be described with reference to the drawings.

  FIG. 2 is a schematic diagram illustrating the configuration of the encoding unit 102. The encoding unit 102 includes a subtracter 1001, an orthogonal transform unit 1002, a quantization unit 1003, a modulation modulation encoding unit 1004, an inverse quantization unit 1005, an inverse orthogonal transform unit 1006, an adder 1007, a deblocking filter unit 1008, a frame. A memory 1009, a motion vector detection unit 1010, a motion compensation unit 1011, an intra-screen prediction direction detection unit 1012, an intra-screen prediction unit 1013, and a selection unit 1014 are configured.

  The subtracter 1001 calculates a difference between the moving image signal output from the imaging unit 200 and the predicted image generated by the in-screen prediction unit 1013 or the motion compensation unit 1011 output from the selection unit 1014 as a macroblock (hereinafter referred to as a macroblock). , And MB, and a residual signal is generated. Then, the residual signal is output to the orthogonal transform unit 1002.

  The orthogonal transform unit 1002 generates a DCT coefficient by performing orthogonal transform on the residual signal output from the subtracter 1001 for each MB that is a predetermined processing unit, and outputs the DCT coefficient to the quantization unit 1003.

  The quantization unit 1003 quantizes the DCT coefficient output from the orthogonal transform unit 1002 based on a quantization parameter set for each MB, and generates a quantization coefficient. Then, the generated quantization coefficient is output to the modulable encoding unit 1004 and the inverse quantization unit 1005.

  Modulatable encoding section 1004 generates encoded data by performing modulation modulation on the quantization coefficient output from quantization section 1003, and outputs the encoded data to recording section 103.

  The inverse quantization unit 1005 restores a DCT coefficient by inverse quantization of the quantization coefficient output from the quantization unit 1003 and outputs the DCT coefficient to the inverse orthogonal transform unit 1006.

  The inverse orthogonal transform unit 1006 performs inverse orthogonal transform on the DCT coefficient output from the inverse quantization unit 1005 to restore the residual signal, and outputs the residual signal to the adder 1007.

  The adder 1007 adds the residual signal output from the inverse orthogonal transform unit 1006 and the prediction image generated by the intra prediction unit 1013 or the motion compensation unit 1011 output from the selection unit 1014 for each MB. Then, a reconstructed image is generated and output to the deblocking filter unit 1008, the intra-screen prediction direction detection unit 1012, and the intra-screen prediction unit 1013.

  The deblocking filter unit 1008 performs deblocking filter processing on the MB boundary in the reconstructed image output from the adder 1007 and outputs the result to the frame memory 1009.

  The frame memory 1009 stores the reference image output from the deblocking filter unit 1008. The frame memory 1009 is composed of a recordable medium such as a flash memory, a DRAM, or a ferroelectric memory. Note that the frame memory 1009 may be configured by the same recording device as the storage unit 104. In this case, the frame memory 1009 and the storage unit 104 are configured by the same recording device, and the recording area of the recording device is logically divided according to information to be recorded.

  The motion vector detection unit 1010 detects a motion vector by performing motion detection on the MB that is the current encoding target using a reference image stored in the frame memory 1009. When a control signal is output from the control unit 105 to the motion vector detection unit 1010, the reference image is limited or motion detection is stopped according to the control signal.

  Based on the motion vector detected by the motion vector detection unit 1010, the motion compensation unit 1011 generates a predicted image in which motion compensation is performed on the reference image stored in the frame memory 1009. Note that a predicted image is an image predicted from a reconstructed image or a reference image generated from a macroblock that has already been encoded with respect to an MB that is currently being encoded.

  The intra-screen prediction direction detection unit 1012 detects a prediction mode applied when performing intra-screen prediction based on the reconstructed image output from the adder 1007 and the moving image signal output from the imaging unit 200. To do. Then, the detected prediction mode is output to the in-screen prediction unit 1013.

  The intra-screen prediction unit 1013 performs intra-screen prediction on the reconstructed image output from the adder 1007, and generates a predicted image. Then, the prediction image is output to the selection unit 1014.

  The selection unit 1014 compares the predicted image output from the in-screen prediction unit 1013 with the predicted image output from the motion compensation unit 1011, and determines the final amount of encoded data output from the encoding unit 102. A predicted image that is determined to be smaller is selected and output to the subtracter 1001. Further, when a control signal is output from the control unit 105 to the selection unit 1014, one of prediction images output from the in-screen prediction unit 1013 and the motion compensation unit 1011 is based on the control signal. Are predicted and output to the subtractor 1001. Specifically, a prediction image generated by a prediction method defined in the control signal is selected. For example, when intra-screen prediction is defined in the control signal, a prediction image predicted by intra-screen prediction is selected. When the selection unit 1014 selects intra prediction, the motion vector detection unit 1010 and the motion compensation unit 1011 may be controlled not to operate. In this case, since it is not necessary to calculate a motion vector and generate a predicted image using inter-screen prediction, there is an effect that the processing amount of the entire moving image encoding apparatus 100 can be further reduced.

  Here, an operation when a control signal is input from the control unit 105 to the encoding unit 102 will be described with reference to the drawings.

  FIG. 3 is a schematic diagram for explaining an operation of changing a prediction method when a control signal is input during encoding of a picture included in a moving image signal.

  Consider a situation in which a control signal using intra prediction is input from the control unit 105 when the t-th MB 301 is encoded as shown in FIG. In this case, the t + 1-th MB 302 and subsequent MBs to be encoded next are encoded using only intra prediction. Note that the pictures after the picture 303 to be encoded when the control signal is input are encoded using intra prediction.

  Next, another operation when a control signal is input from the control unit 105 to the encoding unit 102 will be described.

  As shown in FIG. 3, when encoding a t + 1-th MB 302, when an inter-screen prediction in which the use of a reference image is restricted and a control signal using intra-screen prediction are input, intra-screen prediction or inter-screen prediction It becomes the structure which encodes with the encoding system using prediction. In this case, when using inter-screen prediction, it is defined that the use of the reference image is restricted. Therefore, the picture 303 currently being encoded and the closest temporal picture are set as the reference image. The encoding is performed.

  As another method for restricting the use of the reference image when using inter-screen prediction, the reference that is most frequently referred to when encoding the t + 1th MB302 and subsequent MBs, and the 0th MB304 to the tth MB301 is referred to. You may make it the structure encoded using an image. With the configuration described above, when encoding the t + 1th and subsequent MBs, the reference image to be referred to is limited to one. Therefore, there is an effect that the processing amount of the entire moving image encoding apparatus 100 can be reduced. Further, since the reference image to be referred to is limited to one, reference images other than the selected reference image are unnecessary and can be released from the frame memory 1009.

  Next, the imaging operation of the video camera 10 in Embodiment 1 of the present invention will be described with reference to the drawings.

  FIG. 4 is a flowchart showing a specific operation of the video camera 10 according to Embodiment 1 of the present invention. In FIG. 4, a macroblock encoding operation when a subject is photographed using the video camera 10 will be described.

  First, the encoding unit 102 detects whether a control signal is input from the control unit 105 (step S101). If not detected, the process proceeds to step S102 as normal encoding. In normal encoding, a prediction image is generated using inter-screen prediction (step S102), and then a prediction image is generated using intra-screen prediction (step S103). Then, a prediction image for inter-screen prediction and a prediction image for intra-screen prediction are selected (step S104). Finally, encoding is performed using the prediction image (step S105), and the operation ends.

  If a control signal is detected in step S101, the process proceeds to step S107. In step S107, the prediction method specified by the control signal is detected. If the prediction method is inter-screen prediction and intra-screen prediction, the process proceeds to step S108. If only intra-screen prediction is performed, the process proceeds to step S109. If it is determined in step S107 that the prediction is inter-screen prediction or intra-screen prediction, a prediction image is generated using inter-screen prediction in which the reference image is limited in step S108. Then, the process proceeds to step S103, and thereafter, encoding is performed in the same procedure as when normal encoding is selected in step S101.

  If it is determined in S107 that only intra prediction is performed, a predicted image is generated using intra prediction in step S109. Here, this step S109 is the same operation as step S103. Then, the process proceeds to step S105, encoding is performed using the predicted image, and the macroblock encoding process is completed.

  The moving picture coding apparatus 100 according to Embodiment 1 of the present invention configured as described above encodes a moving picture signal input from the imaging unit 200 when switching from a low frame rate to a high frame rate. It is possible to limit the prediction method applied to the. Therefore, it is possible to reduce the amount of processing related to motion vector detection and motion compensation, and it is possible to encode a captured moving image signal without limiting the image size, imaging time, or the like. Play.

(Modification)
A modification of the moving picture coding apparatus 100 according to Embodiment 1 of the present invention will be described with reference to the drawings. In the moving image encoding apparatus 100 described above, the encoded data encoded by the encoding unit 102 is stored in the recording unit 103. However, for example, when imaging is performed at a frame rate such as 240 fps, the amount of encoded data output from the encoding unit 102 to the recording unit 103 also increases. Therefore, if the configuration uses the same recording unit 103 with a normally used frame rate such as 60 fps and a high frame rate such as 240 fps as in the moving image encoding apparatus 100, a high frame rate is used. Problems arise when taking images with.

  Therefore, as shown in FIG. 5, the first recording unit 106 and the second recording unit 107 are provided. Here, the first recording unit 106 is configured by a recording medium that can record encoded data of a moving image signal captured at a normally used frame rate, such as a DVD, in real time. The second recording unit 107 is configured by a recording medium that can record encoded data of a moving image signal captured at a high frame rate, such as FLASH, in real time.

(Embodiment 2)
Next, the operation of the moving picture coding apparatus 600 according to Embodiment 2 of the present invention will be described with reference to the drawings. In the first embodiment of the present invention, when a frame rate that is normally used such as 60 fps is changed to a high frame rate such as 240 fps, it is applied when a moving image signal input from the imaging unit 200 is encoded. The configuration is such that a prediction method is appropriately selected and the moving image signal is encoded. However, when the frame rate is changed to a high frame rate and the reference image to be referred to when performing intra prediction or inter prediction is limited, at least a part of the reference image stored in the frame memory 1009 in the encoding unit 102 is used. Will not be.

  Therefore, in Embodiment 2 of the present invention, when the prediction method in the encoding unit 102 is limited by the control signal output from the frame rate setting unit 101, the storage area of the frame memory 1009 is limited. The efficiency of the moving picture coding apparatus 600 can be further increased by opening a storage area in which reference images that are not used in the prediction method are stored, and using the open storage area as a storage area for storing moving image signals temporarily captured. It aims at improving.

  Note that the second embodiment is configured such that the frame memory 1009 exists in a part of the storage area of the storage unit 104.

  FIG. 6 is a diagram showing the video camera 20 according to Embodiment 2 of the present invention. In addition, the same number is attached | subjected about the same component as the video camera 10, and description is abbreviate | omitted. The video camera 20 includes an imaging unit 200 and a moving image encoding device 600. Furthermore, the moving image encoding device 600 has a configuration including a control unit 601 instead of the control unit 105 included in the moving image encoding device 100.

  When the control unit 601 detects the FR information output from the frame rate setting unit 101 in addition to the operation of the control unit 105, the control unit 601 releases the data stored in the storage unit 104 according to the FR information, and stores the storage unit 104. The setting of the logical allocation of the storage area of the is changed.

  FIG. 7 is a diagram for explaining data release of the storage unit 104 and change of setting of logical allocation of storage regions in the control unit 601.

  First, FIG. 7A shows a configuration of a storage area included in the storage unit 104 when the moving image encoding apparatus 600 captures an image at a normal frame rate. When the image is captured at a normal frame rate, the accumulation area is a moving image signal accumulation area 701 for accumulating the moving image signal imaged by the imaging unit 200, and a reference image used when the encoding unit 102 performs inter-screen prediction. A reference image storage area 702 for storing the image data, and another storage area 703 for storing the encoded data, the application of the device itself, and the like. The reference image storage area 702 is the frame memory 1009 in the encoding unit 102.

  Next, when the FR information indicating the high-speed frame rate is detected, the control unit 601 changes the setting of the storage area that the storage unit 104 has. Specifically, as shown in FIG. 7B, the reference image stored in the reference image storage region 702 is released, and an extended image signal storage region in which moving image signals captured by the imaging unit 200 are stored in an expanded manner. 704 is set. The reference image storage area 702 to be opened is an area in which reference images that are not used in the prediction method defined in the control signal output by the control unit 601 are stored. Therefore, when the prediction method defined in the control signal is inter-screen prediction, it is necessary to leave a reference image used in the inter-screen prediction in the reference image accumulation area. Therefore, after changing to a high frame rate, the storage unit 104 is set by the control unit 601 so that a part of the reference image storage area is set as the extended image signal storage area 704 and a part remains as the reference image storage area. Is done. Note that the frame memory 1009 may be configured separately from the storage unit 104.

  Next, the operation timing of the storage unit 104 by the control unit 601 will be described with reference to the drawings.

  FIG. 8 is a diagram illustrating the operation of the storage unit 104 when the frame rate setting unit 101 is changed from a normal frame rate such as 60 fps to a high frame rate such as 240 fps. In addition, it is assumed that the number of reference images to be referred to when performing inter-frame prediction at a normal frame rate in the encoding unit 102 is set to three.

  When the normal frame rate is set in the imaging unit 200, the moving image signal captured by the imaging unit 200 is temporarily stored in the storage unit 104. The encoding unit 102 reads out the moving image signal stored in the storage unit 104 and encodes one image in 1/60 seconds. While the encoding unit 102 is encoding an image, the next moving image signal is sent from the imaging unit 200, so the number of moving image signals stored in the storage unit 104 is two.

  The number of reference images stored in the storage unit 104 is four, including three reference images used for encoding and one reference image generated from the image currently being encoded.

  In the frame rate setting unit 101, when the frame rate is changed from 60 fps to 240 fps, the imaging unit captures and outputs an image every 1/240 seconds. After the encoding of the moving image signal captured at 60 fps is completed, the encoding unit 102 encodes the moving image signal captured at 240 fps using only intra-screen encoding. By using only intra-picture encoding, the encoding time for one sheet is shortened, and the encoding for one sheet is completed in 1/240 seconds.

  When the frame rate is changed to 240 fps in the frame rate setting unit 101, the reference image storage area is released, and the number of reference images stored in the storage unit 104 is 0 or 1. The open area is allocated as an extended image signal storage area 704 that stores a moving image signal, and stores a moving image signal output by the imaging unit 200 every 1/240 seconds. The number of moving image signals accumulated in the accumulating unit 104 is a maximum of five because the imaging unit 200 outputs a moving image every 1/240 seconds. These data are accumulated in the moving image signal accumulation area 701 and the extended image signal accumulation area 704 in the accumulation unit 104.

  In the moving picture coding apparatus 600 according to Embodiment 2 of the present invention configured as described above, the prediction scheme used in the coding unit 102 is changed when switching from a normal frame rate to a high frame rate. In this case, among the reference images stored in the storage unit 104 by the control unit 601, reference images that are not used in the encoding unit 102 can be released. For this reason, it is possible to increase the buffer for storing the moving image signal output from the imaging unit 200 without increasing the circuit scale, and the moving image obtained by capturing an image of the subject without limiting the imaging method. There is an effect that a signal can be encoded.

  The present invention realizes an encoding device without adding a circuit or greatly increasing a processing amount even when capturing a high frame rate image when capturing moving images having different frame rates. can do.

  Further, when moving from normal frame rate moving image capturing to high FR moving image capturing, it is possible to make a seamless transition without stopping moving image capturing.

  The present invention particularly relates to H.264. This is effective when data encoded by H.264 / AVC is handled.

The figure which shows the video camera in Embodiment 1 of this invention. Schematic diagram showing the configuration of the encoding unit 102 Schematic diagram for explaining the operation of changing the prediction method when a control signal is input during encoding of a picture included in a moving image signal The flowchart which shows the specific operation | movement at the time of encoding the macroblock in Embodiment 1 of this invention. The figure which shows the modification of the video camera in Embodiment 1 of this invention. Schematic diagram showing the configuration of the video camera 20 according to Embodiment 2 of the present invention. The figure for demonstrating the data release of the accumulation | storage part 104 in the control part 601, and the setting change of the logical allocation of an accumulation | storage area | region. The figure explaining operation | movement of the accumulation | storage part 104 when the frame rate setting part 101 changes from normal frame rates, such as 60 fps, to a high frame rate, such as 240 fps.

DESCRIPTION OF SYMBOLS 10, 20 Video camera 100, 500, 600 Moving picture encoding apparatus 101 Frame rate setting part 102 Coding part 103 Recording part 104 Storage part 105,601 Control part 106 1st recording part 107 2nd recording part 200 Imaging part 301 tth MB
302 t + 1st MB
303 Picture to be coded 701 Moving image signal accumulation region 702 Reference image accumulation region 703 Other accumulation region 704 Extended image signal accumulation region 1001 Subtractor 1002 Orthogonal transform unit 1003 Quantization unit 1004 Modulation coding unit 1005 Inverse quantization Unit 1006 inverse orthogonal transform unit 1007 adder 1008 deblocking filter unit 1009 frame memory 1010 motion vector detection unit 1011 motion compensation unit 1012 intra-screen prediction direction detection unit 1013 intra-screen prediction unit 1014 selection unit

Claims (8)

A moving image encoding apparatus for encoding a moving image signal having a plurality of pictures,
An accumulator for accumulating a reference image generated based on an already encoded picture;
One prediction of intra prediction for generating a prediction image using pixels obtained by decoding an encoded macroblock in a picture to be encoded, and inter prediction for generating a prediction image from the reference image A prediction image generation unit that generates a prediction image corresponding to a macroblock to be encoded using a method;
An encoding unit that encodes the moving image signal based on the predicted image and generates encoded data;
A control unit for controlling the predicted image generation unit,
The moving picture coding apparatus, wherein the control section sets a prediction method to be applied in the predicted picture generation section according to a frame rate at which the moving picture signal is captured. When the moving image signal is captured at a second frame rate that is faster than the first frame rate, the control unit applies the predicted image to the moving image signal captured at the second frame rate. The moving picture encoding apparatus according to claim 1, wherein the prediction image generation unit is controlled to generate the image using the intra prediction. The video encoding device further includes an imaging unit that images the video signal;
A frame rate setting unit that sets a frame rate for imaging in the imaging unit,
While the moving image encoding apparatus is encoding a picture, the control unit sets the frame rate in the imaging unit to a second frame rate that is faster than the first frame rate. In this case, the prediction image generation unit is controlled so as to generate the prediction image corresponding to an uncoded macroblock among the macroblocks included in the picture that is being encoded using intra prediction. The moving picture encoding apparatus according to claim 1. While the moving image encoding apparatus is encoding a picture, the control unit sets the frame rate in the imaging unit to a second frame rate that is faster than the first frame rate. Then, when generating the predicted image corresponding to an uncoded macroblock among the macroblocks of the picture in the middle of encoding using inter-screen prediction, referencing the reference image in the inter-screen prediction The moving image encoding apparatus according to claim 1, wherein the prediction image generation unit is controlled so as to limit a structure. The control unit controls the prediction image generation unit to use, as the reference image, a picture temporally closest to a picture having a macroblock to be encoded among the already encoded pictures. The moving picture encoding apparatus according to claim 4. The control unit controls the prediction image generation unit to use, as the reference image, a picture that is most referenced by an already-encoded macroblock among macroblocks included in a picture to be encoded. The moving picture encoding apparatus according to claim 4. The moving image encoding device includes a plurality of recording units that record the encoding information for each frame rate,
The moving image encoding apparatus according to claim 1, wherein the plurality of recording units are different recording media for each frame rate. The moving image encoding apparatus further includes a control unit that controls the storage unit,
The storage unit stores the captured moving image signal and the reference image,
The encoding unit encodes a moving image signal stored in the storage unit,
The control unit releases an area in which a reference image that is not referred to when the encoding unit generates the predicted image using inter-screen prediction in the recording unit and stores the reference image. 8. The moving image encoding apparatus according to claim 1, wherein a recording area is controlled so as to store the captured moving image signal.