JPH06205361A - Picture signal recording device - Google Patents

Abstract

PURPOSE:To effectively use a digital picture signal generated by an external computer or the like by providing each means used to input an external digital picture signal to a digital signal processing circuit in the recording device. CONSTITUTION:A DI/F circuit 12, a 2nd A/D converter circuit 13 and a 4th DSP 14 apply each processing to input digital (D) and analog (A) picture signals to make the signals suitable for a 3rd DSP 6. Either of an output signal from the circuit 12 or the DSP 14 or an output signal of the 1st DSP 4 is selected by 2nd and 3rd selection switches 15, 16 and the DSP 6 applies picture processing to the selected signal. The processed D picture signal is outputted to a recorder via a 2nd DSP 5, a D/A converter circuit 8 and a 1st selector switch 10 sequentially. Furthermore, when the picture processing is not executed, a switch 10 is thrown from the position D to the position A automatically under the control of a CPU 7. Thus, the D picture signal generated by an external computer or the like is effectively used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal recording apparatus for recording an analog image signal such as a camera-integrated video tape recorder.

[0002]

2. Description of the Related Art Conventionally, in an image signal recording apparatus such as a camera-integrated video tape recorder having an image processing function of performing image processing such as mosaic processing and digital zoom processing on an image signal by a digital signal processing circuit, a device Only the image signal input from the built-in camera (image sensor) is processed by the digital signal processing circuit.

FIG. 2 is a block diagram showing a schematic structure of a conventional camera-integrated video tape recorder (hereinafter referred to as VTR) having the above structure.

In FIG. 2, reference numeral 1 is an optical lens, and 2 is a CCD (image pickup element) as a camera which is an output section inside the apparatus.
Then, the optical image signal input through the lens 1 is converted into an electric signal (photoelectric conversion). Reference numeral 3 denotes an analog / digital conversion circuit (hereinafter referred to as an A / D conversion circuit) CC
The analog image signal input from D2 is converted into a digital signal. 4, 5, 6 are the first, second and third DSPs,
These constitute a digital signal processing block that performs various digital signal processing on the image signal digitally converted by the A / D conversion circuit 3. First DSP4
And the second DSP 5 is a camera interface, the third DSP
A digital signal processing circuit 6 performs special image processing. Reference numeral 7 denotes a CPU (central processing unit) for controlling the first to third DSPs 4 to 6, and 8 denotes a digital / analog conversion circuit (hereinafter referred to as a D / A conversion circuit), which is a digital image signal (digital image signal) after the digital signal processing. The output signal of the second DSP 5) is converted into an analog signal to provide horizontal and vertical synchronization. Reference numeral 9 denotes an analog image signal input terminal dedicated to a recorder for inputting an analog image signal from outside the apparatus, and 10 denotes an analog image signal from the D / A conversion circuit 8 and an analog image signal from the analog image signal input terminal 9. This is a selection switch that is alternatively selected to be sent to a recorder (not shown).

In such a structure, the analog image signal photoelectrically converted by the CCD 2 through the lens 1 is A /
The D conversion circuit 3 converts the digital image signal and inputs the digital image signal to the first DSP 4. The digital image signal input to the first DSP 4 is separated into a luminance signal Y and a color difference signal C, subjected to γ and knee correction processing, which are known techniques, and input to the third DSP 6.

The digital image signal input to the third DSP 6 is subjected to predetermined digital signal processing when image processing such as mosaic processing is performed under the control of the CPU 7, and when image processing is not performed. ,
It is unprocessed, passes through the third DSP 6, and is input to the second DSP 5.

The color difference signal C of the digital image signal input to the second DSP 5 is converted into a carrier color signal (3.
The color subcarrier of 58 [MHz] is modulated. ), The luminance signal Y is subjected to DC setup processing and output.

The digital image signal output of the second DSP 5 is converted into an analog image signal by the D / A conversion circuit 8,
A vertical sync (sync) is added. The output signal of the D / A conversion circuit 8 and the analog image signal input from the outside of the apparatus through the analog image signal input terminal 9 are selectively selected by the selection switch 10 and sent to the recorder. Recorded at the recorder.

A fade (in /
Also when performing the (out) processing, the processing is performed by the third DSP 6 under the control of the CPU 7.

[0010]

In the above-mentioned conventional example, since the external input terminal is an analog image signal input terminal dedicated to the recorder outside the apparatus, a digital image signal is input from outside the apparatus to perform digital signal processing. Image processing cannot be performed in the circuit (third DSP 6), and since the first to third DSPs 4 to 6 are exclusively configured to process the image signal from the CCD 2, the analog image signal input from the external input terminal can be processed. However, there is a problem in that the digital signal processing circuit cannot perform image processing.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an image signal recording apparatus capable of performing image processing even on a digital image signal generated by an external device. The purpose of 1.

A second object of the present invention is to provide an image signal recording apparatus capable of performing digital image processing on both analog image signals and digital image signals generated outside the apparatus.

[0013]

In order to achieve the first object, the first invention of the present invention is to digitize an analog image signal, image-process it by a digital signal processing circuit, and then record it on a recording medium as an analog signal. In the image signal recording apparatus, the digital image signal input means for inputting a digital image signal from the outside of the apparatus to the digital signal processing circuit is provided.

In order to achieve the above-mentioned second object, a second invention of the present invention is an image signal to be recorded on a recording medium as an analog signal after image processing of an image signal output from a camera by a digital signal processing circuit. In a recording device, an analog image signal input means for inputting an analog image signal from outside the device to the digital signal processing circuit through an analog / digital signal converting means, and a digital image signal from outside the device for the digital signal processing circuit Digital image signal input means for directly inputting to
The image signal from the camera, the image signal from the analog image signal input means, and the image signal from the digital image signal input means are selected to be selectively input to the digital signal processing circuit. It is characterized by that.

[0015]

In the image signal recording apparatus according to the first aspect of the invention, the digital image signal is input from the outside of the apparatus to the digital signal processing circuit by the digital image signal input means, and the digital signal processing circuit performs image processing.

The image signal recording apparatus according to the second aspect of the invention comprises a digital image signal input means and an analog image signal input means, which are respectively input from outside the apparatus, and an image signal output from the camera. The three image signals are selectively input to the digital signal processing circuit by the selection means and image-processed by the digital signal processing circuit.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing the schematic arrangement of an image signal recording apparatus according to this embodiment.

In the present embodiment, the same parts as those in FIG. 2 in the above-mentioned conventional example are denoted by the same reference numerals in the drawings, the detailed description thereof will be omitted, and only the characteristic part of the present invention will be described below.

In FIG. 1, 11 is a digital image signal input terminal (digital image signal input means) for inputting a digital image signal from the outside of the apparatus, and 12 is a digital image signal input from the digital image signal input terminal 11. An interface circuit for converting so as to meet the input specifications of the 3DSP 6, and a second analog circuit 13 for converting an analog image signal input from an analog image signal input terminal (analog image signal input means) 9 into a digital image signal.
A digital conversion circuit (hereinafter referred to as a second A / D conversion circuit) 14 is a fourth DSP for converting the image signal A / D converted by the second A / D conversion circuit 13 so as to meet the input specifications of the third DSP 6, Reference numeral 15 is a second selection switch for selecting an output signal from the interface circuit 12 and output signal from the fourth DSP 14, and 16 is a first selection switch for selecting the output signal of the first DSP 4 and the image signal selected by the second selection switch 15. 3 selection switch.

Next, the operation of the image signal recording apparatus according to this embodiment will be described.

The digital image signal input from the digital image signal input terminal 11 is transferred to the interface circuit 12
At the 3rd DSP for clock rate and data arrangement
6 are converted to meet the input specifications.

On the other hand, the analog image signal input from the analog image signal input terminal 9 receives the second A / D conversion circuit 13
Is converted into a digital signal at, and at the fourth DSP 14,
Luminance signal Y is added to remove horizontal and vertical synchronization, DC
Setup processing, the color difference signal C is the added horizontal,
3D for signal processing such as vertical synchronization deletion, demodulation (carrier color signal → color signal), clock rate and data arrangement.
It is converted to meet the input specifications of SP6.

The second selection switch 15 selects one of the output signal from the interface circuit 12 and the output signal from the fourth DSP 14, and further the signal selected by the second selection switch 15 and the output from the first DSP 4. One of the signals is selected by the third selection switch 16 and input to the third DSP 6. This third DS
The digital image signal input to P6 is the third DSP.
In the same manner as the above-mentioned conventional example, the image processing is performed in 6, and the second DSP 5, the D / A conversion circuit 8, the first selection switch 10
Is sequentially output to a recorder (not shown).

When the image processing is not performed,
The first selection switch 10 is automatically controlled by the control of the CPU 7.
Is switched from D (digital signal side) to A (analog signal side), and the analog image signal input from the analog signal input terminal 9 is directly output from the first selection switch 10 to the recorder. D conversion circuit 1
By bypassing the third, fourth DSP 14, third DSP 6, second DSP 5, and D / A conversion circuit 8, image quality deterioration due to image processing in the digital signal processing circuit can be avoided.

[0026]

As described in detail above, according to the image signal recording apparatus of the first invention, since the digital image signal can be inputted to the digital signal processing circuit from outside the apparatus by the digital image signal inputting means, the digital image processing apparatus can be used. A signal can be input from the outside of the apparatus and image processing (digital signal processing) can be performed by a digital signal processing circuit, and a digital image signal generated by a computer or the like outside the apparatus can be effectively used.

According to the image signal recording apparatus of the second invention, the digital image signal input means and the analog image signal input means can input the digital image signal and the analog image signal from outside the apparatus, and the image signal output from the camera. Since these three signals can be selectively input to the digital signal processing circuit by the selecting means, any of the digital image signal, the analog image signal and the image signal from the camera generated outside the apparatus can be Image processing is possible with a digital signal processing circuit.

According to the image signal recording apparatus of the third aspect of the invention, in addition to the above second effect, the digital signal processing circuit is bypassed by bypassing the digital signal processing circuit when image processing is not performed. It is possible to avoid the image quality deterioration due to the signal processing of.

Further, according to the image signal recording apparatus of the fourth invention, in addition to the effects of the second or third invention, a D / A conversion circuit is shared for a plurality of image signal inputs and an image signal from a camera. Therefore, the cost of the entire system and the scale of hardware can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image signal recording apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional image signal recording device.

[Explanation of symbols]

2 CCD (output section inside the device) 3 A / D conversion circuit (analog / digital signal conversion means) 6 3rd DSP (digital signal processing circuit) 7 CPU (control means) 8 D / A conversion circuit (digital / analog signal conversion) Means) 9 analog image signal input terminal (analog image signal input means) 10 first selection switch (control means) 11 digital image signal input terminal (digital image signal input means) 13 second A / D conversion circuit (analog / digital signal conversion) Means) 15 second selection switch (selection means)

Claims (4)

[Claims] 1. An image signal recording apparatus for digitizing an analog image signal, image-processing it by a digital signal processing circuit, and recording it on a recording medium as an analog signal, wherein the digital image signal is supplied to the digital signal processing circuit from outside the apparatus. An image signal recording apparatus comprising a digital image signal input means for directly inputting. 2. An image signal recording apparatus for recording an image signal output from a camera as an analog signal on a recording medium after image processing by a digital signal processing circuit,
An analog image signal input means for inputting an analog image signal from outside the apparatus to the digital signal processing circuit via an analog / digital signal converting means, and a digital image signal from outside the apparatus is directly input to the digital signal processing circuit. Digital image signal input means, image signal from the camera, image signal from the analog image signal input means and image signal from the digital image signal input means are selected to be selectively input to the digital signal processing circuit. An image signal recording device, comprising: 3. When the analog image signal from the analog image signal input means is being input to the digital signal processing circuit by the selection means, when the digital signal processing circuit does not perform processing, 3. The image signal recording apparatus according to claim 2, further comprising control means for controlling the analog image signal so as to bypass the analog / digital signal converting means and the digital signal processing circuit. 4. A digital signal shared by the three types of image signals input to the digital signal processing circuit.
The image signal recording apparatus according to claim 2, further comprising an analog signal converting means.