JPS60242785A - Picture recording and reproducing device for electronic camera - Google Patents

Abstract

PURPOSE:To obtain a reproduced picture of high picture quality with high resolution and less in generation of color false signal by applying frame image pickup at recording of picture to record sequentially a video signal of fields A and B on a recording medium, reading the video signal of the fields A and B at the same time from the said recording medium and synthesizing a color video signal. CONSTITUTION:The video signal of fields A, B recorded on tracks A, B of a recording medium 45 is read at the same time by reproducing heads 48, 49 at reproduction, and after the read video signal is amplified by reproducing amplifier circuits 50, 51, the signal is outputted to sample and hold circuits 52-55. Since the fields A, B is read at the same time, read lines 1, 1', for example, are read at the same time and since the three primary color signals exist on the same horizontal line, a circuit as shown in a conventional example, passing a line sequential signal (red, blue signal) through a delay circuit and converting the signal to a simultaneous signal is not required.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electronic camera that can record a video signal obtained by capturing a still image on a recording medium such as a magnetic disk, and then reproduce it. The present invention relates to an image recording and reproducing device.

[Technical backbone of the invention]

In recent years, as an alternative to optical cameras, electronic cameras have been developed that integrate recording media such as magnetic discs with video cameras. FIG. 1 shows an example of a color filter array used in this electronic camera. This color filter array is used in accordance with the photosensitive section of a solid-state image pickup device placed in the imaging section of an electronic camera. An image of the object is formed on the photosensitive section of the solid-state image sensor through this color filter, and a video signal containing color information of the object is obtained from the solid-state image sensor.

In the color filter array shown in FIG. 1, numerals 1, 2, and 3 indicate signal readout lines in the A field, and numerals 1', z', and 3' indicate signal readout lines in the B field, respectively. In addition, symbols G in the figure,
The portions indicated by R%B indicate filter portions that transmit green, red, and blue, respectively.

FIG. 2 is a configuration diagram showing an example of a conventional image recording and reproducing apparatus for an electronic camera that records and reproduces video signals obtained from the solid-state image sensor. A color filter array (same as that shown in FIG. 1) 21 is closely attached to the photosensitive portion of the image sensor 22. A video signal containing color information is extracted from the image sensor 22, amplified by an amplifier 24, and supplied to a recording head 25. The recording head 25 is located on a recording medium 26 such as a magnetic disk, and the video signal sent to this recording head 25 is recorded on the recording medium 26.

During playback, the video signal recorded on the recording medium 26 is read out by the playback head 27 located on the recording medium 26, and the read video signal is amplified by the amplifier circuit 28 and then sent to the sample hold circuit. Entered at 29.30. The sample and hold circuits 29 and 30 perform color separation from the inputted video signals, and a green signal G is obtained from the sample and hold circuit 29. On the other hand, since the red and blue signals R%B obtained from the sample and hold circuit 30 are line sequential signals, these signals are sent to the switch 32 via the one horizontal scanning period delay circuit 31.

At the same time, it is sent directly to the switch 33. switch 32
．． 33 are switched synchronously, and the red signal R and the blue signal B are separated by alternately selecting the signal passed through the delay circuit 31 and the direct signal from the sample and hold circuit 30 that does not pass through the delay circuit. Output. These green, red, and blue signals G, R, and B can be converted into standard color video signals by a color encoder (not shown) and then monitored.

[Problems with background technology]

By the way, since it is essential for the Naruko camera to be small and lightweight just like a normal optical camera, the absolute number of pixels of the solid-state image sensor 22 is currently insufficient. As shown in the array, it is not possible to extract the three primary colors red, blue, and green from the same horizontal line. For example, only green and red signals are obtained from readout line 1 of the A field. Therefore, to extract the three primary colors,
Line-to-line interpolation is performed based on the information obtained from readout lines 1 and 2 of the A field, thereby extracting three primary color signals to compensate for the lack of pixels in the image sensor 22. As a result, the number of pixels used in the solid-state image sensor 22 is reduced, resulting in insufficient resolution of recorded and reproduced video signals, and because interpolation is performed between lines, unnecessary color false signals are generated. In particular, since electronic cameras capture still images, high image quality is required, and the above-mentioned disadvantages must be avoided.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide an image recording and reproducing device for an electronic camera that has a high resolution and a high image quality in which color artifacts are less likely to occur.

[Summary of the invention]

The present invention writes a video signal including color signals obtained from a solid-state image sensor having a densely layered color filter array onto a recording medium,
In an image recording and reproducing device for an electronic camera that reads video signals recorded on this recording medium, separates three primary color signals, and synthesizes a color video signal from these three primary color signals, frame imaging is performed during image recording. field, B
means for sequentially writing each field video signal separately in different areas of the recording medium; and means for simultaneously reading out the A field and B field video signals written in different areas of the recording medium during image reproduction; The above object is achieved by providing means for separating the three primary color signals from the field signal.

[Example of explanation]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing an embodiment of an image recording and reproducing apparatus for an electronic camera according to the present invention. A color filter array 41 is densely layered on the photosensitive portion of the solid-state image sensor 42. A video signal including a color signal outputted by the solid-state image sensor 42 is amplified by an amplifier 43 and then sent to a recording medium 45 via a switch 44.
The recording heads 46 and 47 located above are supplied with gr. The video signals read out by the Machio heads 48 and 49 located on the recording medium 45 are respectively transmitted to reproduction amplification circuits 50 and 5.
The output signal is input to the sample hold circuit 52, 54, and the output signal is input to the regenerative amplifier circuit 50q).
The output signal of 1 is input to sample and hold circuits 53 and 55. Each output signal of the sample-and-hold circuit 52 and the sample-and-hold circuit 53 is input to the addition circuit 56, and the addition 1! '' path 56 outputs a green signal G. The sample and hold circuit 54 outputs a red signal R, and the sample and hold circuit 55 outputs a blue signal B. Note that the sample and hold circuits 52 and 54 correspond to the A field, and the sample and hold circuits 53 and 55 correspond to the B field.

FIG. 4 is a diagram showing a detailed example of the color filter array 41 of FIG. 3. In the figure, G, R, and B indicate filters that transmit green, red, and blue. In the A field, the green G and red R signals are sent to the solid-state image sensor 4 by the brightening line 1.2.3.
2, and in the B field, green G and blue B@ are read out by readout lines 1', 2', 3'
Next, the operation of this embodiment in which the number is read out from the corresponding pixel of the solid-state image sensor 42 will be described. Among the video signals read out from the solid-state image sensor 42, the signals read out by the A field are applied to a switch 440 and a recording head 46, and are recorded by this recording head 46 on a track A on a recording medium 45. nru. Similarly,
Among the video signals of the solid-state image sensor 42, the video signals read out in the B field are sent to the recording head 47 by the switch 44.
4]1, is recorded on track B on the recording medium 45 by this recording head 47. Note that the recording medium 45
When recording a video signal on a video signal, it may be possible to perform frequency modulation or the like instead of direct recording. It is assumed that the switch 44 is switched in synchronization with the scanning of the solid-state image sensor.

During playback, the playback heads 48 and 49 move the recording medium 45
The video signals of field A and field B recorded on tracks A and B of are simultaneously read out, and the read video signals are amplified by reproduction amplification circuits 50 and 51 and then output to sample bold circuits 52 to 55. be done. The sample and hold circuit 52 receives the green signal G from the video @ signal of the A field.
The sample and hold circuit 53 separates the green signal G from the B field video signal, and the sample and hold circuit 53 separates the green signal G from the B field video signal.
] Added by arithmetic circuit 56 and added green signal G of both fields
is output from the adder circuit 56. The sample and hold circuit 54 separates the red signal R from the A field video signal and outputs all of it. The sample hold circuit 55 separates the blue signal B from the B field video signal and outputs it. Green 1g No. G contributes thickly to the luminance signal, so A
Both sides of the 1B field (e.g. read line 1.1
') are added by addition 1 path 56. Also, since the A field and B field are read at the same time, for example, the read line/
1.1' are read out at the same time, and since there are three primary color signals on the same horizontal line, the line sequential time signals (red,
A circuit that passes the green signal through a delay circuit and converts it into a simultaneous signal is no longer necessary. Green, red and blue traffic lights isolated
SR and B are converted into a composite color video signal using a standard color encoder or the like.

In addition, it is sufficient to perform the interlace operation in the circuit shown in the above ηi3 diagram and change the combination of scanning lines, so that in the A field, the readout line 1.1', the readout line 2.2', . . . in the B field. Read lines 1', 2, read lines 2', 3, etc. may be used.Also, during recording, the two fields are scanned separately and recorded on the recording medium 45, and during playback, the two fields are generated simultaneously. Therefore, if a difference occurs in the video signal between fields, if the readout time for reading out the video signal from the solid-state image sensor 42 during recording is made faster than usual, the above difference can be minimized. It is possible to disable the use of English clay pots.

According to the non-embodiment, when recording an image, frame imaging is performed and video signals read out sequentially from the A field and the B field are read out from the above 21. It is recorded on separate tracks and ASBs of the recording medium 45, and during image reproduction, the A field and B field video signals recorded separately on these tracks A and H are simultaneously read out, and three primary color signals are generated from these two field signals. With this configuration, the color video signal can be synthesized from the video signal using the total number of pixels of the solid-state image sensor 42 during the image reproduction field, and the color video signal can be reproduced. In addition to increasing image resolution, since there is no interpolation between readout lines to extract the three primary color signals, it is possible to reduce the occurrence of color artifacts and improve the reproduced image quality. can.

In the above embodiment, two recording heads were used during recording, but one recording head may also be used. In this case, the video signals of the A field and B field are continuously recorded on one track by one recording head, and the readout lines 1.1' in Fig. 4 are simultaneously reproduced during playback. By scanning the same track using two playback heads spaced apart from each other, A
A configuration may also be adopted in which the video signal of the SB field is read out.

Furthermore, by using a recording/reproducing head that serves both as a recording head and a reproducing head, it is possible to construct a device with two heads.

〔Effect of the invention〕

As described above, according to the electronic camera σ) image recording and reproducing device of the present invention, frame imaging is performed during image recording, and video signals of fields A and B are sequentially recorded on a recording medium, and when reproducing images, the video signals of fields A1 and B are sequentially recorded. By reading the signals from the recording medium simultaneously and combining the symbols of these two fields into a color video signal, it is possible to obtain a high-quality reproduced image with high resolution and less occurrence of color artifacts.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of a conventional color filter array, Fig. 2 is a configuration diagram showing an example of an image recording and reproducing device for a conventional electronic camera, and Fig. 3 is a diagram showing an example of an image recording and reproducing device for an electronic camera according to the present invention. FIG. 4 is a block diagram showing one embodiment of the apparatus, and FIG. 4 is a diagram showing a detailed example of the color filter array used in FIG. 41...Color filter array 42...Solid-state image sensor 44...Switch 45...Recording medium 46.47...Recording head 48.49...Reproducing head 52.53.54.55...・Sample hold circuit agent Patent attorney Nori Yuuki Chika Figure 1 Figure 2 □ □

Claims (1)

[Claims] A video signal including n color signals obtained from a solid-state image sensor having a color filter array is written on a recording medium, the recorded video signal is read out to the recording medium, three primary color signals are separated, and these three primary color signals are In an image recording and reproducing device for an electronic camera that synthesizes color video signals from
Means for performing frame imaging and sequentially writing the A field and B field video signals separately in different areas of the recording medium; The video signals are read out simultaneously, and 3 fields are extracted from these 2 field signals.
An image recording and reproducing device for an electronic camera, characterized by comprising means for separating primary color signals.