JPS63131796A - Video signal recorder - Google Patents

Abstract

PURPOSE:To eliminate a mechanism, a magentic head, etc., by converting the output of an image pick-up element to a digital signal and recording it to a memory. CONSTITUTION:An image pick-up element 1 has a color filter 1a in which plural lines composed by arranging cyclicly respective colors of red(R), green(G) and blue(B) in a horizontal direction are arranged in a vertical direction. The output of the image pick-up element 1 is supplied through an amplifying circuit 2 and an AGC circuit (automatic gain control circuit) 3 to an A/D converter 4 and converted to a digital signal. The digital signal is supplied and recorded through a gamma correcting circuit 5 and a controller 6 to a field memory 7 having the capacity for one field. Into the field memory 7, identifying signals in accordance with the type of the image pick-up element 1, namely, information signals such as the arrangement condition of respective colors the color filter 1a, the number of picture elements in a horizontal direction and the number of the picture elements (horizontal line number) in a vertical direction are also recorded. Thus, the mechanism, a magnetic head system, etc., are eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a video signal recording device for recording still images.

B1 Summary of the Invention The present invention provides a video signal recording device for recording still images, which converts the output of an image sensor having a color filter into a digital signal and records it in a memory, thereby achieving high reliability. Accordingly, image quality deterioration during dubbing can be suppressed, and the circuit section can be easily integrated into an LSI.

BACKGROUND OF THE INVENTION So-called electronic still cameras that record still images on magnetic disks have been proposed. This electronic still camera has a configuration as shown in FIG. 5, for example. That is, an output from an image sensor 101 such as a CCD (charge coupled device) is supplied to a matrix circuit 103 via a synchronization circuit 102. The matrix circuit 103 generates a luminance signal Ev, a color difference signal ER-Ev, and a color difference signal EsEy based on the output from the synchronization circuit 102.
is formed.

After these signals are subjected to predetermined modulation in a modulation circuit 104, they are supplied to a magnetic head 105 and recorded on a magnetic disk 107 that is rotationally driven by a spindle motor 106.

D0 Problems to be Solved by the Invention However, such electronic still cameras cannot be said to be highly reliable due to the presence of a mechanism and a magnetic head system, and furthermore, image quality deteriorates during dubbing. Furthermore,
Since the signal processing is done in analog, the circuit part is LSI.
(large-scale integrated circuits) is difficult to implement.

Therefore, the present invention has been proposed in view of the above-mentioned conventional problems, and provides an image processing system that is highly reliable, can prevent image quality deterioration during dubbing, and can easily convert the circuit section into an LSI. The purpose is to provide a signal recording device.

Means for Solving the E0 Problem In order to solve the above-mentioned problems, the video signal recording device according to the present invention converts the output of an image sensor having a color filter into a digital signal, and converts the output of an image sensor having a color filter into a digital signal, It is characterized in that it is recorded in a memory having a capacity for at least one field along with identification information corresponding to the type of element.

F9 Effect According to the present invention, since the output of the image sensor is converted into a digital signal and recorded in the memory, a mechanism, a magnetic head system, etc. are not required.

G. EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a video signal recording device.

An imaging device such as a CCD for capturing an image of a subject has a plurality of vertically arranged lines in which the colors of red (R), a (G), and blue (B) are arranged cyclically in the horizontal direction. It has a color filter Ia. The number of pixels in the horizontal direction of this image sensor 1 is 3N, and the number of pixels in the vertical direction, that is, the number of horizontal lines, is H.

The output of the image sensor 1 is supplied to an A/D converter (analog/digital conversion circuit) 4 via an amplifier circuit 2 and an AGC circuit (automatic gain control circuit) 3, and is converted into a digital signal. This digital signal is supplied to a field memory 7 having a capacity of 1 field via a T correction circuit 5 that performs γ correction and a controller 6 that controls writing, etc., and is recorded therein. Further, the field memory 7 stores an identification signal corresponding to the type of the image sensor 1, that is, the arrangement state of each color of the color filter 1a.

Information signals such as the number of pixels in the horizontal direction and the number of pixels in the vertical direction (number of horizontal lines) are also recorded.

This information is required during playback.

The signal recorded in the field memory 7 is converted into an analog signal by a D/A converter (digital/analog conversion circuit) 8 and fed back to the AGC circuit 3, so that automatic gain control is performed. Further, a synchronization signal from the controller 6 is supplied to a drive circuit 9 for driving the image sensor 1, and a field memory 7
address and each pixel of the image sensor 1 are synchronized.

Further, the field memory 7 is removable and is in the form of a card, for example, for convenient portability.

Such a video signal recording device uses the field memory 7 as a recording medium and does not require a mechanism or a magnetic head system, so it can be said to have very high reliability.

Furthermore, since the output of the image sensor 1 is converted into a digital signal and recorded in the field memory 7, there is almost no deterioration in image quality during dubbing, and good image quality can be maintained. Furthermore, the amplifier circuit 2 and the GC circuit 3
Everything else is made up of digital circuitry, so
It is easy to implement into an LSI, and can be configured with about 3 to 4 chips, for example. Furthermore, it is possible to miniaturize the device.

Next, an example of a reproducing apparatus for the above-mentioned video signal recording apparatus will be explained with reference to FIG. The output (still image information) from the field memory 7 is converted into an analog signal by a D/A converter 10, and then supplied to a synchronization circuit 20, where color signals are synchronized. The synchronization circuit 20 is an S/H circuit (sample/hold circuit)
2L 22.23, a phase shift circuit 24 that performs a phase shift process of 120 degrees, and a phase shift circuit 25 that performs a phase shift process of 240 degrees. The clock signal φ1 supplied to the clock terminal 30 is supplied as is to the S/H circuit 21, and is also supplied to the S/H circuit 22 via the phase shift circuit 24, and to the S/H circuit 22 via the phase shift circuit 25. The signals are supplied to the circuits 23, respectively. The frequency of the clock signal φ is equal to the horizontal frequency fMA of the image element 1 (for example, 15.
75kHz) and the number of pixels in the horizontal direction (3N), f, lA・
It is 3N.

The output from the synchronization circuit 20, that is, each color signal E*, F, c, from each S/H circuit 21, 22, 23,
E s are respectively supplied to the matrix circuit 40 and output as a luminance signal E7, a color difference signal E++-Ev and a color difference signal EI.
-EV is formed. These signals are then supplied to the encoder 50 and output from the output terminal 60 as, for example, an NTSC standard television signal SNT.

Here, the D/A converter 10 and the matrix circuit 4
The configuration of the synchronization circuit provided between 0 and the clock signal supplied to the synchronization circuit are determined based on the identification signal corresponding to the type of the image sensor 1 recorded in the field memory 7 together with the still image information. Be changed.

For example, instead of the image sensor 1 described above, it is possible to use an image sensor 71 having a color filter 71a as shown in FIG. 3 in a video signal recording device. The color filter 71a
is a line consisting of red (R) and green (G) colors arranged alternately in the horizontal direction, and blue (B).

Lines in which each color of green (G) is arranged in the horizontal direction are alternately arranged in the vertical direction. Further, the number of pixels in the horizontal direction of this image sensor 71 is 2N, and the number of pixels in the vertical direction (number of horizontal lines) is H. When such an image sensor 71 is used, a synchronization circuit 80 as shown in FIG. 4, for example, may be used as a synchronization circuit in the reproduction device. In FIG. 4, parts corresponding to those in FIG. 2 are given the same reference numerals. The above-mentioned synchronization circuit 80 includes S/H circuits 81, 82 and 1
It is composed of a phase shift circuit 83 that performs a phase shift process of 80 degrees, an IH delay circuit 84 that has a delay amount of IH (one horizontal period), and changeover switches 85 and 86. The clock signal φ3 supplied to the clock terminal 30 is transmitted to the phase shift circuit 8.
3 to the S/H circuit 81, and is also supplied as is to the S/H circuit 82. The above clock signal φ3
The frequency of is the horizontal frequency f of the image sensor 71, Il(
For example, the product of 15.75 kHz) and the number of pixels in the horizontal direction, 2N, is f,ll·2N.

A green signal E is output from the S/H circuit 81 and supplied to the matrix circuit 40. Further, the S/H circuit 82 outputs a red signal EIl and a blue signal E alternately for each IH. The output from this S/H circuit 82,
The output from the IH delay circuit 84 is alternately selected for each IH by the changeover switches 85 and 86. As a result, the changeover switch 85 outputs a red signal E, and the changeover switch 86 outputs a blue signal E, which are respectively supplied to the matrix circuit 40. The operations after the matrix circuit 40 are the same as those of the reproducing apparatus shown in FIG. 2, and the explanation thereof will be omitted.

H0 Effects of the Invention As is clear from the description of the embodiments described above, the video signal recording device of the present invention converts the output of the image sensor into a digital signal and records it in the memory, and the mechanism and magnetic head system are etc., so it can be said that the reliability is very high. Furthermore, there is almost no deterioration in image quality during dubbing, and good image quality can be maintained. Furthermore, the circuit section can be easily integrated into an LSI.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a video signal recording device according to the present invention, and FIG. 2 is a block diagram showing an example of a reproducing device for the video signal recording device of FIG. 3 is a diagram showing another example of the image sensor, and FIG. 4 is a block diagram showing an example of a reproduction device for the image sensor of FIG. 3. FIG. 5 is a block diagram showing an example of the configuration of a conventional electronic still camera. 1.71...Image sensor la, 71a...Color filter 4...A/D converter 7...Field memory

Claims (1)

[Scope of Claims] The output of an image sensor having a color filter is converted into a digital signal, and the digital signal is recorded in a memory having a capacity for at least one field along with an identification signal according to the type of the image sensor. video signal recording device.