JP2004072148A - Av data recording apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AV data recording apparatus capable of simultaneously recording a moving picture and a still picture to solve problems of prior arts and having compatibility between recording of a moving picture with excellent S/N and recording of a still picture with high resolution. <P>SOLUTION: The AV data recording apparatus includes: an imaging lens 100; a distribution section for distributing a light beam made incident from the imaging lens; at least one photodetector for receiving the light beam distributed by the distribution section and outputting the received light beam as a moving picture signal; at least one photodetector for receiving the light beam distributed by the distribution section and outputting the received light beam as a still picture signal; a moving picture signal recording section for recording the moving picture signal; and a still picture signal recording section for recording the still picture signal. A moving picture photographing CCD 102 (with e.g., 350,000 pixels) and a still picture photographing CCD 110 (with e.g., 4,000,000 pixels) receive the incident light branched by a prism 101. The moving picture is MPEG-compressed and the still picture is JPEG-compressed, and both pictures are recorded on a memory card 130 at the same time. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an AV data recording apparatus and method for recording and reproducing moving images and still images using a recording medium such as a memory card and an optical disk.
[0002]
[Prior art]
Some recent camcorders have a function of recording a moving image on a tape and simultaneously recording a still image on a memory card in order to record a moving image and a still image at the same time.
[0003]
FIG. 3 shows a configuration of a conventional AV data recording / reproducing apparatus (for example, a camcorder). The user selects moving image shooting or still image shooting, and performs either one of the shootings. At the time of shooting a moving image, a light beam incident from the lens 300 reaches the CCD 302 via the stop 350. An interlaced video signal is output from the CCD 302, A / D converted by an A / D conversion unit 303, and enters an MPEG2 compression unit 305 via a video signal processing unit 304. On the other hand, the audio signal input from the audio input unit 320 enters the MPEG2 compression unit 305 via the audio A / D conversion unit 321. In the MPEG2 compression unit 305, the video signal and the audio signal are MPEG2 compressed and recorded on the memory card 330.
[0004]
On the other hand, at the time of shooting a still image, a progressive video signal is output from the CCD 302, A / D converted by the A / D conversion unit 303, and enters the JPEG compression unit 312 via the still image signal processing unit 312. Then, the data is JPEG-compressed by the JPEG compression unit 312 and recorded on the memory card 330.
[0005]
At the time of reproduction, the MPEG2 data read from the memory card 330 is decoded by the MPEG2 decompression unit 340, the video data is displayed on the LCD 343 via the D / A conversion unit 342, and the audio data is stored in the audio D / A conversion unit. The sound is reproduced by the speaker 346 via 345. On the other hand, the JPEG data read from the memory card 330 is decoded via the JPEG decompression unit 341 and displayed on the LCD 343 via the D / A conversion unit 342. The output of the D / A converter 342 and the output of the audio D / A converter 345 can also be reproduced by the TV 344.
[0006]
[Problems to be solved by the invention]
However, since the conventional camcorder employs a common CCD for recording moving images and recording still images, it has been difficult to simultaneously record high-resolution still images while recording moving images.
[0007]
For example, using a CCD capable of outputting 60 frames per second at 600,000 pixels, a video frame photographed at 600,000 pixels is reduced and zoomed down to about 350,000 pixels (about 720 × 480) (an entire image is reduced). At the time of such moving image recording, even if one frame in the moving image is cut out as a still image and recorded as still image data different from the moving image, the number of pixels of the still image is at most 600,000.
[0008]
Also, some camcorders using a CCD that can perform both moving image shooting and still image shooting can record a 1.5 million pixel still image when not shooting a moving image. However, since still-image CCDs such as digital still cameras capable of recording still images of 6 million pixels have been commercialized, the still image shooting function of a camcorder is inferior to that of a digital camera.
[0009]
Also, in the case of a camcorder using a CCD that is used for both a moving image and a still image, the S / N ratio (signal / noise) at the time of moving image shooting is increased by using a CCD with a large number of pixels to increase the number of pixels of the still image. Tended to decrease. This is because in the case of a CCD that combines moving image recording and still image recording, the light receiving area per unit pixel is smaller than that of a CCD dedicated to moving images.
[0010]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to enable simultaneous recording of a moving image and a still image, and to achieve both recording of a moving image with an excellent S / N ratio and recording of a high-resolution still image. And
[0011]
[Means for Solving the Problems]
In order to achieve the above object, an AV data recording apparatus according to the present invention includes an imaging lens, a distribution unit for distributing a light beam incident from the imaging lens, a light receiving unit for receiving the light beam distributed by the distribution unit, and a moving image signal. At least one light receiving element that outputs the light beam distributed by the distribution unit, and outputs at least one light receiving element that outputs a still image signal; a moving image signal recording unit that records the moving image signal; A still image signal recording unit for recording signals. Thereby, the light beam incident from the imaging lens is distributed by the distribution unit, and the moving image signal and the still image signal are processed and recorded by the independent light receiving elements, respectively, so that the moving image and the still image can be simultaneously recorded. .
[0012]
In the AV data recording apparatus of the present invention, the light receiving element for outputting the still image signal is a light receiving element having more pixels than the light receiving element for outputting the moving image signal. This makes it possible to achieve both recording of a moving image with an excellent S / N ratio and recording of a high-resolution still image.
[0013]
In the AV data recording device of the present invention, the moving image signal recording unit or the still image signal recording unit further records related information for associating the moving image signal with the still image signal. Thereby, the moving image and the still image can be recorded in association with each other.
[0014]
Further, the AV data recording apparatus of the present invention includes an aperture for each light receiving element, and the aperture values of the apertures are independently set. As a result, the aperture can be set independently for the light receiving element that processes a moving image and the light receiving element that processes a still image, so that the aperture value can be set according to the characteristics of each light receiving element.
[0015]
Also, the AV data recording method of the present invention includes a step of distributing an incident light beam to at least two light receiving elements; a step of recording a moving image signal output from at least one of the light receiving elements; Recording a still image signal output from at least one of the light receiving elements. As a result, the incident light beam is distributed, and the moving image signal and the still image signal are processed and recorded by independent light receiving elements, respectively, so that a moving image and a still image can be recorded simultaneously.
[0016]
Further, the AV data recording method of the present invention further includes a step of recording related information for associating a moving image signal with a still image signal. Thereby, the moving image and the still image can be recorded in association with each other.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an AV data recording apparatus (for example, a camcorder) according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 100 denotes an imaging lens; 101, a prism for distributing light rays received by the imaging lens 100; 102, a moving image CCD; 103, a moving image A / D converter for A / D converting an output of the moving image CCD; Is a moving image signal processing unit, 105 is an MPEG2 compression unit, 110 is a still image CCD, 111 is a still image A / D conversion unit that A / D converts the output of the still image CCD, and 112 is a still image signal processing Unit, 113 a JPEG compression unit, 120 an audio input unit to which an audio signal is input, 121 an audio A / D converter for A / D converting the audio signal, 130 a memory card for recording moving images and still images, 140 is an MPEG2 decompression unit for decompressing MPEG2 moving images read from the memory card, 141 is a JPEG decompression unit for decompressing JPEG still images read from the memory card, and 142 is D / A converter for D / A conversion of the image signal, 143 LCD, 144 are TV, 145 is the audio D / A converter for D / A converts audio signals, 146 a speaker, 150 denotes a stop.
[0018]
Here, it is desirable that the still image CCD 110 has a larger number of pixels than the moving image CCD 102 in order to obtain a high-resolution still image. Therefore, a 4 million pixel CCD is used as the still image CCD 110, and a 350,000 pixel CCD is used as the moving image CCD 102. The moving image CCD 102 uses a complementary color filter, and the still image CCD 110 uses a primary color filter. The moving image CCD 102 outputs a video signal of 60 fields, and the still image CCD 110 can output a still image signal of at least 4 million pixels at a predetermined cycle (for example, 4 sheets per second).
[0019]
FIG. 2 is a flowchart illustrating the operation of the AV data recording device. Hereinafter, the operation of the AV data recording apparatus will be described with reference to FIGS.
[0020]
It is assumed that the user gives an instruction to record a still image at an arbitrary timing during moving image shooting. First, the moving image shooting operation will be described. When there is no instruction for recording a still image and there is an instruction for recording a moving image, the moving image shooting operation starts (S1, S2). When moving image shooting is started, a light beam incident from the lens 100 reaches the moving image CCD 102 via the stop 150 and the prism 101. The interlaced video signal is output from the moving image CCD 102 and A / D converted by the moving image A / D converter 103 (S3). The audio signal input from the audio input unit 120 is A / D converted by the audio A / D conversion unit 121 (S4). The A / D converted video signal is input to the MPEG2 compression unit 105 via the moving image signal processing unit 104, and the A / D converted audio signal is also input to the MPEG2 compression unit 105. In the MPEG2 compression section, the video signal and the audio signal are MPEG2 compressed (S5) and recorded on the memory card 130 (S6). Then, when the user gives an instruction to stop the photographing operation, the process ends, and when there is no instruction to stop the photographing operation, the process continues (S7).
[0021]
Next, the still image shooting operation will be described. When a still image photographing is instructed (S1), the light beam incident from the lens 100 reaches the still image CCD 110 via the stop 150 and the prism 101. A progressive video signal is output from the still image CCD 110, and A / D converted by the still image A / D 111 (S8). Then, it is input to the JPEG compression unit 113 via the still image signal processing unit 112, is JPEG-compressed (S9), and is recorded on the memory card 130 (S10).
[0022]
At the time of reproduction, the MPEG2 data read from the memory card 130 is decoded by the MPEG2 decompression unit 140, the video signal is displayed on the LCD 143 via the D / A conversion unit 142, and the audio signal is output from the audio D / A conversion unit. The sound is reproduced by the speaker 146 via the speaker 145.
[0023]
On the other hand, the JPEG data read from the memory card 130 is decoded via the JPEG decompression unit 141 and displayed on the LCD 143 via the D / A conversion unit 142. The output of the D / A converter 142 and the audio D / A converter 145 can be reproduced by the TV 145.
[0024]
Here, the description has been made on the assumption that the MPEG2-compressed moving image data and the JPEG-compressed still image data are recorded as independent data. However, the JPEG-compressed still image data is replaced with any of the MPEG2-compressed moving image data. Related information indicating whether a frame corresponds may be recorded at the same time. This related information is expressed as an elapsed time from the beginning of the recorded moving image data, a presentation time stamp of the moving image frame, or a frame number from the beginning. Then, the related information may be recorded by linking to still image data, may be recorded by linking to moving image data, or may be recorded as independent data. This makes it possible to associate the recorded moving image data with the still image data. Further, related information indicating which field in the moving image data corresponds to the still image data may be recorded.
[0025]
With the above configuration, recording of a moving image and recording of a still image can be simultaneously recorded. At the same time, the resolution of the still image (that is, the number of pixels constituting the still image) can be easily improved. Further, since the number of pixels of the moving image CCD can be determined independently of a still image, a CCD that outputs a moving image with an excellent S / N ratio can be selected.
[0026]
In the first embodiment, the moving image CCD 102 and the still image CCD 110 are complementary color filters and primary color filters, respectively. However, primary color filters and complementary color filters may be used, respectively. Both may be primary color filters, or both may be complementary color filters.
[0027]
Although the moving image CCD 102 outputs a video signal of 60 fields in the first embodiment, a video signal of 60 frames may be output. However, in this case, it goes without saying that it is necessary to increase the throughput of the portion related to recording from 30 frames to 60 frames.
[0028]
Although only two CCDs are used in the first embodiment, a third CCD (CCD for moving images) is used, its video output is converted to a CIF size, and then MPEG4 compression is performed. It may be recorded at the same time. Here, it goes without saying that high-resolution still image recording becomes possible while recording MPEG2 data and MPEG4 data.
[0029]
In the first embodiment, only two CCDs are used. However, a third CCD (moving image CCD) is used, and the two moving image CCDs output an image of 30 frames per second, for a total of every second. A 60-frame image may be MPEG2 compressed and recorded on a memory card.
(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram of the AV data recording apparatus according to the second embodiment. Components having the same reference numerals as those in FIG. 1 have the same functions, and therefore detailed description is omitted.
[0030]
The difference from the first embodiment is that dedicated apertures 250 and 251 exist for the moving image CCD and the still image CCD, respectively. Thereby, the aperture value of a moving image and the aperture value of a still image can be set independently. This expands the range of still image expression. For example, if a high-speed shutter is used by opening the aperture more than a moving image, the blurring of the subject can be reduced as compared with a video taken by a moving image.
[0031]
This makes it possible to simultaneously obtain smooth moving image data and sharp still image data with less blur.
[0032]
In this embodiment, the storage medium is a memory card. However, the present invention is not limited to this. For example, MO, DVD @ RAM, DVD-R, DVD-RW, DVD + RW, CD-R, A recording medium having a disk shape such as an optical disk such as a CD-RW or a hard disk may be used.
[0033]
In this embodiment, the moving image data is MPEG2 data. However, it goes without saying that DV data, motion JPEG2000 data and the like may be used. However, in this case, it is needless to say that the MPEG compression unit needs to be replaced with a DV compression unit.
[0034]
In this embodiment, the still image data is JPEG data. However, it is needless to say that DCF data, Exif data, and the like may be used.
[0035]
In this embodiment, the storage medium is a memory card. However, the present invention is not limited to this. For example, MO, DVD @ RAM, DVD-R, DVD-RW, DVD + RW, CD-R, A recording medium having a disk shape such as an optical disk such as a CD-RW or a hard disk may be used.
[0036]
In the present embodiment, a still image is recorded during shooting of a moving image. However, needless to say, a still image may be recorded alone. Even in this case, it is possible to obtain the same resolution as that of a digital camera while being a camcorder.
[0037]
【The invention's effect】
As described above, according to the AV data recording apparatus of the present invention, it is possible to simultaneously record a moving image with an excellent S / N ratio and a high-resolution still image.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an AV data recording device according to a first embodiment; FIG. 2 is a flowchart of an AV data recording method according to a first embodiment; FIG. 3 is a configuration diagram of an AV data recording device according to a second embodiment; Configuration diagram of a conventional AV data recording / reproducing apparatus.
101 Lens 101 Prism 102 Movie CCD
103 moving image A / D converter 104 moving image signal processor 105 MPEG2 compressor 110 still image CCD
111 A / D conversion unit for still image 112 Signal processing unit for still image 113 JPEG compression unit 120 Audio input unit 121 A / D conversion unit for audio 130 Memory card 140 MPEG2 decompression unit 141 JPEG decompression unit 142 D / A conversion unit 143 LCD
144 TV
145 Audio D / A converter 146 Speaker 150 Aperture 160 Recording / reproducing device

Claims (6)

An imaging lens;
A distribution unit that distributes a light beam incident from the imaging lens,
At least one light receiving element that receives the light beam distributed by the distribution unit and outputs the light beam as a moving image signal;
At least one light receiving element that receives the light beam distributed by the distribution unit and outputs the received light beam as a still image signal;
A moving image signal recording unit that records the moving image signal,
An AV data recording device, comprising: a still image signal recording unit that records the still image signal. 2. The AV data recording apparatus according to claim 1, wherein the light receiving element for outputting the still image signal is a light receiving element having more pixels than the light receiving element for outputting the moving image signal. The AV data recording device according to claim 1, wherein the moving image signal recording unit or the still image signal recording unit further records related information for associating the moving image signal with the still image signal. The AV data recording apparatus according to any one of claims 1 to 3, wherein each of the light receiving elements has an aperture, and the aperture value of each of the apertures is independently set. Distributing the incident light beam to at least two light receiving elements;
A step of recording a moving image signal output from at least one of the light receiving elements,
Recording a still image signal output from at least one of the light receiving elements. 6. The AV data recording method according to claim 5, further comprising a step of recording related information for associating the moving image signal with the still image signal.

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