KR0144729B1 - Apparatus for processing color image signal - Google Patents

Abstract

No content

Description

Color image signal processing device

1 is a circuit diagram showing one embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: camera signal processing system 2: playback signal processing system

3: Video signal recorder 6: A / D conversion

7: Line memory 11.16: D / A conversion circuit

20: rotating head 21: magnetic tape

26: addition circuit 29, 30, 32: subtraction circuit

31: Trap circuit 33: Band pass filter

The present invention relates to a color image signal processing apparatus most suitable for use in a camera-integrated VTR capable of reproduction.

The present invention relates to a color image signal processing apparatus most suitable for a camera-integrated VTR capable of reproducing, comprising: a reproduction luminance signal and a reproduction carrier color signal including crosstalk components from adjacent tracks obtained by scanning a recording medium by a magnetic head; Greatly simplifying the circuit by using the line memory of the camera signal processing system as a comb filter for removing the cross torque component of the reproduction signal processing system which obtains a luminance signal and a carrier color signal that do not include the crosstalk component by processing It is aimed at miniaturization, cost reduction, and low consumption.

In a conventional camera-integrated VTR capable of reproducing, the camera signal processing of the proxy and the reproduction signal processing at the time of reproduction are performed in completely independent blocks. Therefore, in the camera signal processing system that performs the camera signal processing at the time of recording, a delay line longer than one horizontal period (1H) is used for vertical processing of the carrier color signal and aperture control of the luminance signal.

On the other hand, a delay line of one or more horizontal periods is used in the reproduction signal processing system that performs reproduction signal processing during reproduction, for crosstalk cancellation of luminance signals, dropout compensation circuits, and crosstalk cancellation of carrier color signals.

Furthermore, the need for delay lines as line memories in camera signal processing systems is generally limited to having complementary colors checkered filters and aperture control circuits. In addition, Japanese Patent Application Laid-Open No. 59-244096 discloses adding the luminance signal and the carrier color signal and separating the luminance signal and the carrier color signal again through a single comb-type filter.

However, in the conventional camera-integrated VTR capable of reproducing as described above, since a delay line of at least one horizontal period is used for each of the camera signal processing system and the reproduction signal processing system, the number of the delay lines is large, and thus the circuit configuration is complicated. In addition, the mounting space is increased, the cost is expensive, and the power consumption is further reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and by sharing a delay line or the like used in a camera signal processing system with a comb-type filter in a reproduction signal processing system, the circuit configuration can be simplified, miniaturized, and the cost can be reduced. It is to provide a color image signal processing device that can reduce the power.

The apparatus for processing color resolution signals according to the present invention supplies a signal from the imaging section 4 to the line memory 7 and forms a luminance signal and a carrier color signal based on the delay signal obtained in the line memory 7. A reproduction luminance signal and a reproduction carrier color signal including a crosstalk component from an adjacent track obtained by scanning the recording medium 21 by the camera head processing system 1 and the magnetic head 20 which are sent out and cross the image processing. A reproduction signal processing system (2) which obtains a luminance signal and a carrier color signal containing no torque component, and is followed by the reproduction signal processing system (2) as a comb filter for removing crosstalk components. The memory 7 is configured to be used.

In the camera signal processing system 1 which performs the camera signal processing at the time of recording, the signal from the imaging unit 4 is supplied to the line memory 7 via the A / D conversion circuit 6, and the through (OH) obtained here. An interpolation signal is generated from the upper and lower lines of the luminance control aperture control signal and the carrier color signal based on the through-signal, one horizontal period (1H) delay signal, and two horizontal period (2H) delay signals. The luminance signal and the carrier color signal are respectively formed on the basis of the signal and output through the D / A conversion circuits 11 and 16.

On the other hand, in the reproduction signal processing system 2 which performs reproduction signal processing at the time of reproduction, the reproduction luminance signal and the reproduction carrier color including the crosstalk components from adjacent tracks obtained by scanning the recording medium 21 by the magnetic head 20 A / D change circuit 6, line memory 7 and the camera signal processing system 2 at the same time as supplying the signal directly to the first and second subtracting means 29, 31, 32 and 30, 33, respectively. Subtraction is performed by supplying to the first and second subtraction means via the D / A conversion circuits 11 and 16. In the first and second subtraction means, a luminance signal and a carrier color signal that do not include respective crosstalks are obtained. In this way, the A / D conversion circuit 6, the line memory 7 and the D / A conversion circuits 11 and 16 of the camera signal processing system 1 are substantially comb-shaped filters of the reproduction signal processing system 2. By using a common structure, the configuration is simple and compact, the cost is low, and the power consumption can be reduced.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the same figure, reference numeral 1 denotes a camera signal processing system, reference numeral 2 denotes a reproduction signal processing system, and reference numeral 3 denotes a video signal recording system. At the time of recording, the imaging signal from the CCD image 4 passes to the contact a side of the switch 5, is supplied to the A / D conversion circuit 6, and is converted into an analog signal from a analog signal to the line memory 7. Supplied. The line memory 7 is formed of a plurality of 1H delay circuits 7a and 7b, in which a through (OHD) signal, a 1H delay (1HD) signal and a 2H delay (2HD) signal are formed and apertured together. It is supplied to the control circuit 8, and the aperture control signal of a luminance signal is formed, and aperture control is performed by this. Again, the output signal of the aperture control circuit is gamma corrected in the gamma correction circuit 9, passes through the contact a side of the switch 10, and is supplied to the D / A conversion circuit 11 as an analog luminance signal. Withdrawn.

In addition, a through signal, a 1H delay signal, and a 2H delay signal from the line memory 7 are supplied to the color separation circuit 12, where an interpolation signal from the upper and lower lines of the carrier color signal is formed, and the Based on this, the signals of R, G, and B are separated. This separated signal is subjected to white balance by the white balance circuit 13, supplied to the gamma correction circuit and the encoder 14, subjected to gamma correction, and then encoded into an NTSC or PAL signal to retrieve the D / A conversion (16). It is supplied to and is taken out as an analog carrier signal.

In this way, the luminance signal and the carrier signal drawn from the camera signal processing system 1 are supplied to the FM modulation circuit 17 and the frequency conversion circuit 18 of the video signal recording system 3, respectively.

Even after being supplied to the FM modulator circuit 17, the signal is FM modulated here. In this case, the FM modulation carrier frequency is shifted by 1/2 fh every horizontal field per field (1 track) so that the cross talk components of adjacent tracks are in frequency interleaved relationship with the main signal components. The FM luminance signal from this FM modulator circuit 17 is advanced to one input side of the addition circuit 19.

In addition, the carrier color signal supplied to the frequency conversion circuit 18 has a frequency of about 743 KHz (8 millisecond VTR) at 3.58 MHz when the subcarrier frequency is NTSC, so that the frequency conversion is performed on the low side of the FM luminance signal. do. In the case of such frequency conversion, crosstalk components from adjacent tracks by the phase inversion (PI) method or the phase shift (PS) method, or the like, are in a frequency interleaved relationship with the main signal component. The low-conversion carrier color signal is supplied to the input side of the other side of the addition circuit 19, and is added to the FM luminance signal occupying the high side, and the addition signal is supplied to the rotating head 20 which is the magnetic head, thereby providing the magnetic tape ( 21) recorded as one inclined magnetic track per field.

In addition, the rotating head 20 is actually two heads facing 180 degrees, which rotate in one frame period so that the magnetic tape 21 is wound obliquely over a predetermined angle range along the rotational main surface thereof at a constant speed. It is transported in a certain direction.

Next, at the time of reproduction, the reproduction signal from the magnetic tape 21 is drawn out by the rotating head 20, and when the reproduction signal is supplied to the high pass filter 22 of the reproduction signal processing system 2, the FM luminance signal is drawn out. When supplied to the low pass filter 23, a low-conversion carrier color signal is extracted.

Thus, the FM luminance signal by the high pass filter 22 is FM demodulated by the FM demodulation circuit 24. This demodulated luminance signal includes crosstalk components from adjacent tracks. This luminance signal is thus supplied to one input side of the addition circuit 26 via the de-emphasis circuit 25.

On the other hand, the low-conversion carrier color signal by the low pass filter 23 is supplied to the frequency converter circuit 28 through the ACC circuit 27, where it is returned to the original 3.58 MHz subcarrier signal, which is The input side of the addition circuit 26 is supplied to the input side. This carrier color signal also includes a crosstalk component from an adjacent client.

The luminance signal and the carrier color signal added by the addition circuit 26 are supplied to the input side of one of the subtraction circuits 29 and 30, and are simultaneously supplied to the A / D conversion circuit 6 through the contact b of the switch 5; Is supplied and converted into a digital signal. The converted digital signal is supplied to the line memory 7, where the 1H delayed signal is supplied to the D / A conversion circuit 11 through the contact b of the switch 10 to be converted into an analog signal, and the subtraction circuit ( 11), it is converted into an analog signal and supplied to the other end of the subtraction circuit 29. The signal component supplied to the other input side of this subtraction circuit 29 is a crosstalk component of the luminance signal and the carrier color signal. As a result, on the output side of the subtraction circuit 29, the crosstalk component and the carrier color signal of the gray signal are obtained, and when this passes through the trap signal 31, only the crosstalk and the component of the luminance signal are extracted and the subtraction circuit 32 is obtained. It is supplied to the one side of the inlet side. On the other input side of this subtraction circuit 32, the luminance signal and its crosstalk component are supplied from the de-emphasis circuit 25, so that the crosstalk component is removed in the subtraction retrospective 32, and the luminance on the output side thereof. Only the signal is drawn out.

In addition, in the case of NTSC in reproduction, the switch 15 is connected to the contact br side so that the 1H delayed signal in the line memory 7 is supplied to the D / A conversion circuit 16, while in the case of PAL, the switch 15 Is connected to the contact b side, and the signal delayed by 2H in the line memory 7 is supplied to the D / A conversion circuit 16.

Thus, the signal converted into the analog signal in the D / A conversion circuit 16 is supplied to the input side of the other side of the subtraction circuit 30. The signal supplied to the other input side of this subtraction circuit 30 is a crosstalk component of the luminance signal and the carrier color signal. As a result, the crosstalk component of the luminance signal and the carrier color signal are obtained on the output side of the subtraction retrospective 30, and this passes through the band pass filter 33 to extract only the carrier color signal.

This carrier color signal is supplied to the addition circuit 34 together with this luminance signal by the subtraction circuit 32, and as a result, the desired color image signal is drawn out to the output terminal 35. As shown in FIG. Reference numeral 36 denotes an APC circuit for achieving phase lock by inverting the output of the band pass filter 33 to the frequency converter circuit 28.

As described above, in the present embodiment, the A / D conversion circuit 6, the line memory 7 and the D / A conversion circuits 11 and 16 of the camera signal processing system 1 are reproduced at the time of reproduction. By forming the comb-shaped filter of the reproduction signal processing system 2 together with the addition circuit 26, subtraction circuits 29 and 30 in (2), the circuit configuration is simplified, thereby making it compact and low in cost. And less power consumption.

In addition, in the above-described embodiment, the calculation around the comb-shaped filter such as subtraction may be performed in the state of the digital signal before the D / A conversion circuits 11 and 16. In addition, two A / D converters and the like are used for the luminance signal and the carrier color signal without adding the luminance signal and the carrier color signal and converting them to one A / D conversion circuit 6 as crosstalk cancellation during reproduction. You may do it. In the above-described embodiment, the luminance signal, the carrier color signal, and both are passed through the line memory, but at least one of both signals may be passed through. In addition to the comb-type filter, circuits such as aperture control circuits and the like may be used as the reproduction signal processing system.

As described above, according to the present invention, in the reproduction signal processing system, a comb teeth for removing the crosstalk component from the reproduction luminance signal and the reproduction carrier color signal including the crosstalk component from the adjacent tracks through the line memory of the camera signal processing system. By sharing as a type filter, the circuit configuration can be simplified, downsized, reduced in cost, and low in power consumption.

Claims (1)

Analog-digital conversion means for converting an imager signal into a digital form, a sampling clock means having a frequency four times the color subcarrier frequency for supplying the analog-digital conversion means, and a line delay for delaying the digital imager signal. Means for generating a luminance signal from said digital imager signal and a delayed version from said line delay means, means for generating a color signal from said digital imager signal and a delayed version from said line delay means; Imager signal processing means for processing the digital imager signal including means for encoding a color signal into a carrier color signal, digital-to-analog conversion means for converting the luminance signal and the carrier color signal from digital to analog form; FM-modulation number for frequency modulating a carrier wave with the luminance signal And recording means for recording the analog color signal and the luminance signal on a magnetic medium, the means comprising combining the resulting FM luminance signal with the carrier color signal located at the lower end of the FM luminance signal band. At least one of the recording means operating in a mode, the reproducing means operating in a reproducing mode for reproducing an analog type luminance signal and a color signal from the magnetic medium, and the at least one of the reproduced luminance signal and the color signal. Means for applying to the line delay means through conversion means, and means for obtaining a composite image signal from one of the dispatch from the line delay means and the reproduced luminance signal and color signal applied to the line delay means. A signal processing apparatus, a magnetic recording and reproducing apparatus incorporated in a video camera, and a field of view of the camera A video camera comprising an imager means for providing an imager signal corresponding to an object in a region.

Images