JPS6145918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A conventional conveyed color generating device has a color filter configuration as shown in FIGS. 1A and B, and a green signal G is applied to each line.
An imaging device that can obtain red signal R and blue signal B
An image pickup device has been proposed which is equipped with an image pickup device that can obtain a line-sequential image signal, and is configured to obtain a color video signal from a green signal G for each line and a red signal R and a blue signal B that are line-sequential. In such a conventional carrier color signal generating device, to obtain the color difference signals _ERY and _EBY from the signals of the n line and the n+1 line, E _R-Yo+1 = R-Y = 0.70Rn-0.59Gn ₊₁ - 0.11Bn ₊₁ ………(1) E _B-Yo+1 = B-Y = 0.89Bn ₊₁ −0.59Gn ₊₁ −0.30Rn ………A configuration that satisfies the formula of (2) is taken. ing. Here, Y is a luminance signal, and n is a natural number of 1, 2, . . . . In this case, the nth
The line is black and the signal level is “0”, and the n _+1th
When the line is white and the signal level is "1", Rn = Gn = 0 Gn ₊₁ = Rn ₊₁ = 1, and the color difference signal at this time is E _R-Yo+1 = -0.7 E _{B- Yo+1} = 0.3, and even though an achromatic image is being taken, a signal level appears in the color difference signal, resulting in color. That is, when a black-and-white image is captured, the color difference signal in a portion having no correlation in the vertical direction becomes E _RY ≠ 0 and E _BY ≠ 0, so that it is reproduced as a so-called "shape", which deteriorates the reproduced image quality.

In view of these points, the present invention is designed to improve the above-mentioned drawbacks.

Now, considering the color difference signals E _RY and E _BY in general, E _RY = R - Y = 0.7 (R - G) - 0.11 (B -
G) ………(3) E _BY =B-Y=0.89(B-G)-0.30(R-
G) ......(4) can be replaced. Here, in the above-mentioned imaging device in which the red signal and the blue signal are obtained on separate lines, and the green signal is obtained on each line, it is possible to obtain the red signal R and the green signal G from the same line. At the same time, the blue signal B and the green signal G can be obtained from the same line. Therefore, when obtaining a color difference signal from the signals of the nth line and the n ₊₁ line, the above equations (3) and (4) are E _R-Yo+1 = 0.7 (Rn - Gn) - 0.11 (Bn ₊₁ -
Gn ₊₁ ) ………(5) E _B-Yo+1 = 0.89 (Bn ₊₁ − Gn ₊₁ ) − 0.30 (Rn −
Gn) ......(6)

In the present invention, the carrier color signal generating device is constructed so as to satisfy these equations (5) and (6).

In this configuration, the nth line of the object being imaged is black and the signal level is "0", the n _+1th line is white and the signal level is "1", and Rn=Gn=0 Gn When ₊₁ = Bn ₊₁ = 1, the color difference signal becomes E _R-Yo+1 = 0 E _B-Yo+1 = 0, and so-called "color blur" in the reproduced image can be improved.

Hereinafter, an embodiment of the carrier color signal generating device of the present invention which satisfies the equations (5) and (6) will be described with reference to FIG.

In FIG. 2, reference numeral 1 denotes an imaging device from which a green signal G is obtained for each line on its output side, and reference numeral 2 represents an imaging device from which a red signal R and a blue signal B are obtained line-sequentially from its output side. 1a and 2a indicate color filters, respectively. The imaging devices 1 and 2 are configured to perform horizontal and vertical scanning in synchronization with horizontal and vertical signals obtained from a synchronization board 3, respectively. Also, in this example, the imaging devices 1 and 2 are BBD and CCD.
The color solid-state imaging device uses semiconductor elements such as the following as a solid-state imaging body.
A 4.5MHz sampling signal is supplied to the imaging devices 1 and 2.

The video signal of the green signal G for each line from the imaging device 1 which obtains the green signal G for each line is supplied via the sampling hold circuit 4 for waveform shaping to the process circuit 5 that performs γ correction, black level setting, etc. , the green signal G obtained at the output side of this process circuit 5 is supplied to a first input terminal of a matrix circuit 6 for obtaining a luminance signal Y. Further, the line-sequential video signals of the red signal R and the blue signal B from the imaging device 2 are supplied to a process circuit 8 that performs gamma correction, black level setting, etc. via a sampling hold circuit 7 for waveform shaping. A delay circuit 9 supplies the line-sequential signals of the red signal R and blue signal B obtained at the output side of the matrix circuit 6 to the second input terminal of the matrix circuit 6, and delays the input signal by one horizontal period. is supplied to the third input terminal of this matrix circuit 6 via. In this case, the signals supplied to the second and third input terminals of this matrix circuit 6 are red signals Rn every horizontal period.
and blue signal Bn ₊₁ are sequentially different, and the red signal R is supplied to one of the second and third input terminals, and the blue signal B is supplied to the other, and the output side of this matrix circuit 6 is supplied as in the conventional case. A luminance signal Y is obtained, and the luminance signal Y obtained at the output side of the matrix circuit 6 is supplied to a color video signal synthesis circuit 10. Further, the green signal Gn ₊₁ for each line obtained at the output side of the process circuit 5 is supplied to one fixed contact 12a of the switch 12 via a delay circuit 11 that delays the input signal by one horizontal period, and the green signal for each line is Gn ₊₁ is supplied to the other fixed contact 12b of this switch 12, and the movable contact 12 of this switch 12
The signal obtained at point c is supplied to the other input terminal of the subtraction circuit 13. Further, the line sequential signals of the red signal R and the blue signal B delayed by one horizontal period obtained on the output side of the delay circuit 9 are connected to one fixed contact 1 of the switch 14.
The red signal R and the blue signal B, which are supplied to the output side of the process circuit 8 at the same time as being supplied to the output side of the process circuit 8, are supplied to the other fixed contact 14b of this switch 14, and are obtained at the movable contact 14c of this switch 14. The signal is supplied to one input terminal of the subtraction circuit 13. Further, the green signal Gn ₊₁ obtained at the output side of the process circuit 5 is supplied to one fixed contact 15a of the switching device 15, and the green signal Gn for each line delayed by one horizontal period obtained at the output side of the delay circuit 11 is supplied to the output side of the delay circuit 11. The signal is supplied to the other fixed contact 15b of the switch 15, and the signal obtained at the movable contact 15c of the switch 15 is supplied to the other input terminal of the subtraction circuit 16. Also, the line-sequential video signals of the red signal R and the blue signal B obtained at the output side of the process circuit 8 are supplied to one fixed contact 17a of the switch 17, and the line-sequential video signals obtained at the output side of the delay circuit 9 are supplied to one horizontal period. The line-sequential video signals of the delayed red signal R and blue signal B are supplied to the other fixed contact 17b of this switch 17, and the signal obtained at the movable contact 17c of this switch 17 is applied to one of the subtraction circuits 16. Supplied to the input terminal. In this case, the movable contacts 12c, 14c, 15c, and 17c of the switching devices 12, 14, 15, and 17 are switched in synchronization with the horizontal synchronization signal from the synchronization board 3. That is, one input terminal of the subtraction circuit 13
When the red signal Rn of the line is supplied, the green signal Gn of the nth line is supplied to the other input terminal of this subtraction circuit 13, and the difference signal (Rn-Gn ), and at this time, the blue signal Bn +1 of the n ₊₁ line is supplied to one input terminal of the subtraction circuit 16, and furthermore, the blue signal Bn ₊₁ of the n+1 line is supplied to the other input terminal of the subtraction circuit ₁₆ at this time. The line green signal Gn ₊₁ is supplied so that a difference signal (Bn ₊₁ - Gn ₊₁ ) is obtained at the output side of the subtraction circuit 16. The difference signal (Rn-Gn) obtained at the output side of this subtraction circuit 13 is multiplied by -0.3 times its input signal.
0.3 amplifier 18 and this difference signal (Rn
−Gn) to multiply its input signal by 0.7 times 0.7 amplifier 1
The difference signal (Bn ₊₁ - Gn ₊₁ ) obtained at the output side of the subtraction circuit 16 is supplied to the 0.89 amplifier 20 which multiplies its _input signal by 0.89. Gn ₊₁ ) to a -0.11 amplifier 21 which multiplies its input signal by -0.11. The output signal -0.3 (Rn - Gn) of the -0.3 amplifier 18 and the output signal 0.89 (Bn ₊₁ - Gn ₊₁ ) of the 0.89 amplifier 20 are supplied to one input terminal and the other input terminal of the adder circuit 22, respectively. , 0.89(Bn ₊₁ −
Obtain the signal of equation (6) corresponding to the (B-Y) color difference signal of Gn ₊₁ ) -0.30 (Rn - Gn), and balance the (B-Y) color difference signal obtained at the output side of this adder circuit 22. The signal is supplied to the modulator 23. Also, the output signal of the 0.7 amplifier 19 is 0.7
(Rn−Gn) and −0.11 output signal of amplifier 21 −
0.11 (Bn ₊₁ − Gn ₊₁ ) are respectively supplied to one and the other input terminals of the adder circuit 24 , and 0.7 (Rn − Gn) −0.11 (Bn ₊₁ − ) is supplied to the output side of the adder circuit 24 .
The signal of formula (5) corresponding to the (R-Y) color _difference signal of
Supply to 5. As is well known, the balanced modulators 23 and 25 transmit subcarrier signals, for example, 3.58 MHz, which are out of phase by 90 degrees to each other (B-Y) color difference signal and (R
-Y) Balanced modulation is performed using color difference signals.
The respective output signals of the balanced modulators 23 and 25 are added in an adder circuit 26 to obtain a carrier color signal, and the carrier signal obtained at the output side of the adder circuit 26 is supplied to the color video signal synthesis circuit 10, In addition, the horizontal and vertical synchronizing signals obtained from the synchronization board 3 are supplied to the color video signal synthesis circuit 10, and the synchronization board 3
The burst signal obtained is supplied to this color video signal synthesis circuit 10, and a composite color video signal is obtained at the output terminal 10a of this color video signal synthesis circuit 10.

In the example shown in FIG. 2, the (R-Y) color difference signal and the (B-Y) color difference signal are obtained from a configuration that satisfies equations (5) and (6), so the so-called "color" of the reproduced image is Tabby”
can be improved.

As described above, according to the present invention, there is an advantage that the so-called "color blur" in the reproduced image when a monochrome image is captured is improved.

Also, using three lines, the nth line, the n ₊₁ line, and the n+2th line, E RY(o _{+ 2)} = 0.7 (Rn−Gn+Rn ₊₂ −Gn ₊₂ )/2−0.11(Bn _{+ 1}
−Gn ₊₁ ) ………(7) E _BY(o+2) = 0.89(Bn ₊₁ −Gn ₊₂ )−0.30(Rn−Gn+Rn ₊₂ −
Gn ₊₂ )/2 ......(8) is satisfied, and three lines, the n ₊₁ line, the n ₊₂ line, and the n ₊ 3 line, are used, and E _RY(o+3) = 0.7 (Rn ₊₂ −Gn ₊₂ ) −0.11 (Bn ₊₁ −Gn ₊₁ +Bn ₊₃
−Gn ₊₃ )/2 ………(9) E _BY(o+3) = 0.89 (Bn ₊₁ −Gn ₊₁ +Bn ₊₃ −Gn ₊₃ )/2−0.30
(Rn ₊₂ −Gn ₊₂ ) Even if it is configured to satisfy (10), the same effect as shown in Fig. 2 can be obtained. In this case, the first or second term of the equation becomes an averaged signal, which is more advantageous when reproducing color signals. Further, this specific example can be constructed in the same manner as shown in FIG. 2, as shown in FIG. In this Figure 3, the second
Portions corresponding to those in the figures are given the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 3, the output signal of the process circuit 5 from which the green signal G for each line is obtained is input to one side of the adder circuit 29 through series circuits of delay circuits 27 and 28 each having one horizontal period. The green signal G obtained at the output of the delay circuit 27 is supplied to the input of the matrix circuit 6, and the output signal of the process circuit 5 is supplied to the other input of the adder circuit 29. For example, a Gn ₊₂ +Gn signal is obtained on the output side of the adder circuit 29, and this signal is sent to the switch 3.
0 to one fixed contact 30a of the switch 31, and the output signal of the adder circuit 29 to the other fixed contact 31b of the switch 31. Further, the output signal of the delay circuit 27, for example, the Gn ₊₁ signal, is supplied to one fixed contact 31a of the switch 31, and is also supplied to the other fixed contact 30b of the switch 30, and is obtained at the movable contact 30c of this switch 30. For example, when a Gn ₊₂ +Gn signal is supplied to the other input terminal of the subtraction circuit 32 and obtained at the movable contact 31c of the switch 31,
The Gn ₊₁ signal is supplied to the other input terminal of the subtraction circuit 33. Further, the output signal of the delay circuit 9 is supplied to one input terminal of the adder circuit 35 via the delay circuit 34 having a delay time of one horizontal period, and the output signal of the process circuit 8 is supplied to the other input terminal of the adder circuit 35. For example, a Rn ₊₂ +Rn signal is obtained on the output side of the adder circuit 35, and this signal is supplied to one fixed contact 36a of the switch 36, and the switch 3
7, and supplies the output signal of the delay circuit 9, for example, the Bn ₊₁ signal, to one fixed contact 37a of the switch 37.
is supplied to the other fixed contact 36b. The signal obtained at the movable contact 36c of the switch 36 is supplied to one input terminal of the subtraction circuit 32, and the signal obtained at the movable contact 37c of the switch 37 is supplied to one input terminal of the subtraction circuit 33. In this case, the movable contacts 30c, 31c, 36c, and 37c of the switches 30, 31, 36, and 37 are switched in synchronization with the horizontal synchronization signal from the synchronization board 3.
That is, when the signal of the n ₊₂ line is supplied from the imaging devices 1 and 2, the movable contacts 30c and 31
c, 36c and 37c are each connected to one fixed contact 30
a, 31a, 36a, and 37a, and when the signal of the n ₊₃ line is supplied from the imaging devices 1 and 2, these movable contacts 30c, 31c, and 36c
and 37c to the other fixed contacts 30b and 31, respectively.
b, 36b and 37b. Therefore, in the case of the n ₊₂ line, the Rn ₊₂ −Gn ₊₂ +Rn−Gn signal is obtained at the output side of the subtraction circuit 32, and the Bn ₊₁ −Gn ₊₁ signal is obtained at the output side of the subtraction circuit 33. is,
Also, in the case of the nth ₊₃ line, the output side of the subtraction circuit 32
An Rn ₊₂ −Gn ₊₂ signal is obtained, and a Bn ₊₃ −Gn ₊₃ +Bn ₊₁ −Gn ₊₁ signal is obtained at the output side of the subtraction circuit 33. Further, the output signal of this subtraction circuit 32 is supplied to one fixed contact 39a of the switch 39 via a 1/2 amplifier circuit 38 that halves the input signal, and the output signal of this subtraction circuit 32 is supplied to one fixed contact 39a of the switch 39. The signal obtained at the movable contact 39c of this switch 39 is supplied to the input sides of the -0.3 amplifier 18 and the 0.7 amplifier 19, respectively. Also, the output signal of the subtraction circuit 33 is halved from the input signal.
The signal is supplied to one fixed contact 41a of the switch 41 via the 1/2 amplifier circuit 40, and the output signal of the subtraction circuit 33 is supplied to the other fixed contact 41a of the switch 41.
b, and the signal obtained at the movable contact 41c of this switch 41 is supplied to the input sides of the 0.89 switch 20 and the -0.11 amplifier 21, respectively. In this case, the movable contacts 39c and 41c of the switching devices 39 and 41, respectively
is switched in synchronization with the horizontal synchronization signal from the synchronization board 3. That is, when the signal of the n ₊₂ line is being supplied from the imaging devices 1 and 2, the movable contacts 39c and 41c are connected to one of the fixed contacts 39a.
, and when the signal of the n ₊₃ line is supplied from the imaging devices 1 and 2, the movable contact 39c
and 41c to the other fixed contacts 39b and 41, respectively.
b. Therefore, for the n ₊₂ line, the movable contact 39c of the switch 39 receives a signal of (Rn ₊₂ - Gn ₊₂ +Rn - Gn)/2, and the movable contact 41c of the switch 41 receives a signal of (Bn ₊₁ −Gn ₊₁ ) signal is obtained. Also, at the n ₊₃ line, the (Rn ₊₂ - Gn ₊₂ ) signal is obtained at the movable contact 39c of the switch 39, and the (Bn ₊₃ - Gn ₊₃ +Bn ₊₎ signal is obtained at the movable contact 41c of the switch 41. A signal of ₁ − Gn ₊₁ )/2 is obtained. The rest of the structure is the same as in FIG. 2.

Therefore, in the example of FIG. 3, at the n ₊₂ line, the output side of the adder circuit 22 is 0.89 (Bn _{+1 −} Gn ₊₁ ) − 0.30 (Rn − Gn + Rn ₊₂ −
Equation (8) corresponding to the (B-Y) color difference signal of Gn ₊₂ )/2
signal is obtained. Also, on the output side of the adder circuit 24, 0.7 (Rn−Gn+Rn ₊₂ −Gn ₊₂ )/2−0.11(Bn ₊₁
−Gn ₊₁ ), a signal expressed by equation (7) corresponding to the (R−Y) color difference signal is obtained. Also, for the nth ₊₃ line, the output side of the adder circuit 22 is 0.89 (Bn ₊₁ −Gn ₊₁ +Bn ₊₃ −Gn ₊₃ )/2−0.30
The signal of equation (10) corresponding to the (B-Y) color difference signal of (Rn ₊₂ − Gn ₊₂ ) is obtained, and the output side of the adder circuit 24 has a signal of 0.7 (Rn ₊₂ − Gn ₊₂ )−0.11. (Bn ₊₁ −Gn ₊₁ +Bn ₊₃
-Gn ₊₃ )/2 (R-Y) color difference signal equivalent formula
The signal (9) is obtained. Other operations operate in the same manner as in FIG. Also in Fig. 3, the (R-Y) color difference signal and the (B-Y) color difference signal are obtained from the configuration that satisfies equations (7), (8), (9), and (10). It is possible to improve the so-called "color blur" in the reproduced image.

Also, when obtaining a PAL color video signal, the phase of the subcarrier signal supplied to the (R-Y) balanced modulator 25 in FIG. 2 may be changed by 180° every horizontal period. According to the invention, a good color video signal of the PAL system can be easily obtained.

Furthermore, a similar configuration can be used when creating an IQ signal.
That is, I=0.63R-0.28G-0.32B =0.63(R-G)-0.32(B-G) Q=0.21R-0.52G+0.31B =0.21(R-G)+0.31(B-G) The R signal and G signal and the B signal and G signal in the cutout can be respectively obtained by signals on the same line. That is, I = 0.63 (Rn - Gn) - 0.32 (Bn ₊₁ - Gn ₊₁ )
………(11) Q=0.21(Rn−Gn)+0.31(Bn ₊₁ −Gn ₊₁ )
It is easy to understand that if the configuration satisfies equations (11) and (12) of (12), the same effect as shown in FIG. 2 can be obtained.

Further, in the above embodiment, an example was described in which two imaging devices 1 and 2 are used, but a color filter 27a as shown in FIG. 4 is used, and the green signal G and red signal R are Obtain repeated signals, in the second line blue signal B and green signal G
One imaging device is used to obtain a repetitive signal, and from this output signal, a line-sequential signal of a red signal R and a blue signal B is obtained, and a green signal G is obtained for each line. It is easy to understand that the same effects as described above can be obtained with one imaging device 1 by processing in the same manner as described above. Further, the present invention is not limited to the above-described embodiments, and various other configurations may be adopted without departing from the gist of the present invention.

[Brief explanation of the drawing]

1 and 4 are diagrams showing examples of color filters, FIG. 2 is a block diagram showing one embodiment of the carrier signal generating device of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. FIG. 1 and 2 are respectively image pickup devices, 3 is a synchronous board, 6 is a matrix circuit, and 9 and 11 are delay circuits 1, respectively.
2, 14, 15 and 17 are switchers, 13 and 16 are subtraction circuits, 18, 19, 20 and 2.
1 is an amplifier, 22, 24 and 26 are adder circuits, and 23 and 25 are balanced modulators.

Claims (1)

[Claims] 1. An imaging device is provided in which a red signal and a blue signal are obtained on separate lines, and a green signal is obtained on each line, and the red signal and green signal of one line from the imaging device are and a second difference signal between the blue signal and the green signal of the adjacent line to form an orthogonal two-axis signal, and modulate the orthogonal two-axis signal to obtain a carrier color signal. Carrier color signal generator.