JPS5999438A - Color printer by television signal - Google Patents

Abstract

PURPOSE:To obtain a sharp image in a short time in the stage of performing color printing using a TV signal by using the signals consisting of only the low range signal component as three color signals to be used for color printing, and using the signal consisting of only the high range signal component as a black signal. CONSTITUTION:The TV signal supplied to an input terminal 1 is processed to a luminance signal Y and color difference signals R-Y, B-Y in a signal processing circuit DEC and are processed to a luminance signal Y and three primary color signals R, G, B in a matrix circuit MTX. The signal Y is applied to an HPF, from which the high range signal component Yh of the signal Y is outputted. The signals R, G, B are applied to LPFr, LPFg, LPFb, by which low range signal components Rl, Gl, Bl are outputted. These outputs are subjected to an AD conversion and are stored in a digital memory DM. The signals stored in the memory DM are read out in prescribed order, and are supplied to a recording section RE. Printing is performed on paper P by the ink of prescribed colors according to the printing signals recorded in the section RE. The sharp image is thus printed in a short time with good color reproducibility.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color printing device that can perform color printing using television signals.

(Prior Art and Problems) A color printing device that can perform color printing using television signals (hereinafter, television is abbreviated as W) was previously filed with the applicant company in a patent application. Showa 57
A patent application was filed as No. 95627, and it was discovered that by using this already proposed color printing device, it was possible to obtain high-quality color printed matter using television signals. In the color printing device that has been proposed, yellow, magenta, and cyan inks are used for printing, and black ink is used, which may cause dissatisfaction depending on the content of the image. Raw L: 1.

So, the printing ink is yellow, macenta/color/a7.
We created a prototype color printing device that can always produce satisfactory printed matter by using four colors, black and white, to perform color printing, but this four-color printing device can only print three colors. Of course, the printing time is longer compared to other machines, so it would be desirable to shorten the printing time.

(First Means to Solve the Problem) The present invention provides an R
, G, and B, and when 1 represents the state in which each of the primary color signals corresponds to a primary color with 100% saturation, then
The three color signals Ye, M are represented by B, M, : 1-G, Cy:F 1-R, respectively.

cy and when the luminance signal Y of the W signal is in the white 100 ratio state, it is expressed as 1. At this time, a black signal Bk as shown by Bk:Fl-Y is obtained, and the above-mentioned 1 and 3 are obtained. Color signal Ye
+M+Cy and the black signal Bk are used to perform ℃ color printing using inks of yellow, magenta, seven colors of green, and black, which correspond to the three color signals and the black signal, respectively. The three color signals used in color printing consist of only low-frequency signal components, and the black signal used in color printing consists of only high-frequency signal components. The method in which the printer is used is designed to provide color printing that overcomes the problems already mentioned.

(Embodiment) Hereinafter, specific details of a color printing apparatus using a W signal according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a color printing apparatus using TV signals according to the present invention.
) is a block diagram of the main part of one embodiment, in FIG. 1, 1 is an input terminal for a television signal to be printed in color;
In this case, the luminance signal Y and the carrier color signal are band-sharing multiplexed within the band of the luminance signal Y, and a single W signal (for example, a composite color video signal of the NTSC system) is provided. has been done.

The 1 signal supplied to input terminal 1 is a signal processing circuit (decoder).In DFJC, luminance signal Y and color difference signal R
-Y, B-Y, and then the above-mentioned luminance signal Y and color difference signals R-Y, B-Y, etc. are sent to the matrix circuit MTX.
As a result, a luminance signal Y and three primary color signals R, G, and B are obtained.

The brightness signal YI'i is given to the high-pass filter HPF' (hereinafter referred to as the west-range C-wave filter HPF), and the brightness signal YI'i is given to the high-pass filter HPF' (hereinafter referred to as the west-range C-wave filter HPF), and the brightness signal YI'i is given to the high-pass filter HPF' (hereinafter referred to as the west-range C-wave filter HPF), and the brightness signal YI'i is given to the high-pass filter HPF' (hereinafter referred to as the west-range C wave filter HPF), and the brightness signal YI' For example, a frequency of 500 KHz to 4 MHz and a 4-degree signal Yh in the i band are output.

The three primary color signals R, G, and B output from the matrix circuit MTX are passed through low-pass filters (hereinafter referred to as low-pass filters) LPF r and LP, respectively.
Fg.

LPFbK, J: For example, primary color signals ut, Gt, Bt and π occupying the frequency band below 500 KHz)
It will be done.

One luminance signal Yh output from the sieve area γ wave balancer HPF,
The primary color signals Rt, Gt, Bl, etc. output from the low-pass filter 1"i LPFr, LPFg, and LPFb are as follows:
Each individual ADCy to digital converter (hereinafter referred to as a converter).

ADCr, ADCg, ADCb K and therefore digital signal Yhd.

It is converted into Rld, God, and BAd and stored in the digital memory.

conversion S ADCy , ADCr , ADCg , AD
C-eye digital memory DM and changeover switch SW to be described later
Control signals necessary for the operation of each of the constituent parts are given from the control signal generating circuit C8G to each of the above-mentioned constituent parts, and each of the above-mentioned constituent parts performs the required operation at a predetermined timing.

The digital signals stored in the digital memo IJ DIVI are read out in a predetermined order and sent to the signal conversion circuit SCD K.
Therefore, it is converted into a signal for printing, and then the changeover switch SW
The ink is supplied to the recording unit via the recording unit, and the recording unit prints on the paper P with ink of a predetermined color according to the printing signal supplied thereto.

The manner in which the signal from the digital message DM is output depends on whether the recording (printing) manner in the recording unit is performed in a line-sequential manner, a field-sequential manner, or a point-by-point manner. Needless to say, the manner of switching the changeover switch SW is different depending on whether the changeover switch is
＠It is suitable for the aspect and is made to be one thing.

Previous N? The signal conversion circuit SCD converts the three primary color signals of red, green, and blue into R, G, and B, and the state in which each of the above primary color signals corresponds to a primary color with 100% saturation is established. 1, the three primary color signals mentioned above are expressed as M
E l -G, Ye E1-B, Cyte1
- As shown by RK; Depressive color signal Y
It is configured to have conversion characteristics such that e, M, and Cy each have a transformation characteristic,
Then, the digital signal Rtd given to the signal conversion circuit 5CI) is outputted from the signal conversion circuit SCD as a printing signal YetdE (1-Bid), and then sent to the signal conversion circuit SCD. 4 girls izl this digital signal G
td is the printing signal Mid3 (
1-Gtd), and further output as signal conversion circuit SC
The digital signal Bad given to D is sent from the signal conversion circuit SCD to the printing signal Cyld, 5 (1-Red
) is output as

1. The signal fmlLjl (abbreviated SCD) is represented by 1 when the luminance signal Y of the signal is in the white 100 range. B
Since the digital signal Yhd is configured to have conversion characteristics such that it can be converted into a digital signal, the signal conversion circuit SCD receives four digital signals Yhd, and the signal conversion circuit SCD outputs a printing signal Bkhd:E (1-Yhd). is output as

As in the configuration example shown in Fig. 1, when signal processing is performed by converting the luminance signal Y into the high-frequency signal component ■ or the low-frequency signal components of each color signal R, G, and B, the memory In addition, the signal conversion operation in the signal conversion circuit SCD can be performed extremely easily, and a printing signal in the form of a digital signal can be applied to the recording section to print on paper using printing ink. When printing, a type of operation is used in which the recording element is turned on and off, and by operating the recording element the number of times corresponding to the digital value indicated by the printing signal, one pixel (1
The area of ink adhesion within each picture element and the amount (density) of ink adhesion within each picture element are changed in accordance with the number of times the recording element is operated, so that the recorded image has the necessary gradation. Be able to do that.

It goes without saying that the gradation prevention obtained with the above-mentioned one recording section is limited to bit ls' of the printing signal, but now,
If it is assumed that an 8e recorded image requires 64 gradations for side reception, the printing signal in that case will be a 6-bit digital signal, and as an Ishokukyokai, it is difficult to input it. Use something that can convert an analog signal into a 6-bit digital signal.

By the way, in the case of a 1'V signal, it has been confirmed that the signal 1-bell of the 114] region signal component of Sowa is smaller than the signal level of the i region signal component, so As mentioned above, if the band is limited to 0.5 MHz or less, and the low frequency signal component of the color signal is quantized with 6 bits as described above, then Regarding the MJ region multiplied signal component of the signal having a band of o5iv to 41VfHz, it may be quantized, for example, by 5 bits.

Therefore, as the digital converter ADCy, one that can convert the high frequency signal component Yh of the luminance signal Y into a 5-bit digital signal Yhd is used.
As r, ADCg, and ADCb, each color signal R1G
, B can be used to convert the low frequency signal components Rt, Gz, Bt into 6-bit digital signals RAd, Gld, Btd.

Then, as mentioned above, the digital signal Yhd obtained by dividing the ambient signal component (2) of the luminance signal Y by AI) is the color signal R,
G, B low frequency signal components R1, G1 . If the digital signal obtained by adding Bt to ADlf is made into a digital signal with 1 bit less than RAd, GAd, and Bid, bit a of the printing signal corresponding to black ink will also be in yellow, magenta, and 7 colors. Since it is 1 bit less than the number of bits of the printing signal corresponding to each ink such as yt, 4
The time required to print each color is 3.5 times the time required to print one color.

1. It is clear from the sampling theorem that in an AD converter, sampling quantization must be performed at a sampling quantization that is more than twice the maximum quotient frequency of the analog signal that is being converted. However, now, the highest frequency band of the installed signal component Yh of the luminance signal Y is 4 MHz, and the low frequency signal components Rt, GA of the color signals R, G, and B are
, Bt's most effective frequency is 0.5 MHz, + M) Cy's sampling frequency is 8 MHz.
z or more, ADW '$ gM ADCr, ADCg
, the sampling frequency in ADCb is l IV
IH2 or higher and Sano 1. There must be.

As mentioned above, the sampling frequency U in the one-time AD transformer ADCy that converts the low-frequency signal component of the color signal is the one-time AD transformer ADCy that converts the area signal component of the luminance signal Y into AL.
ADRm g=ADCr, ADCg, ADCMc
Although the sampling frequency may be lower than the sampling frequency in any of the converters ADCr, ADCg, AI)Cb, if the sampling frequency in the converter ADCyK is the same as that in the converter ADCyK, the printing signal Yeld, Mjd
, Cyld can be made equal to the transfer speed of the printing signal Bkhd, and the printing time can be significantly shortened.

In the case of a recording device that performs recording operations based on printing signals, a thermal head is used as the recording element, or an inkjet is used as the recording element, or other types of recording elements are used. Color transfer paper can also be used for recording (printing) with a single recording section configured using a thermal head.

FIG. 2 uses Anamig memory DMa as the memory,
Also, a signal conversion circuit 5CDa based on an AnamiG signal (for example, a configuration similar to the printing signal generation circuit SCT in Japanese Patent Application No. 57-95627 may be used) is used as the signal conversion circuit, and further, The present invention uses a recording element that can change the density of ink or the area of ink deposited within a pixel according to the size of a printing signal, and is equipped with one recording section decoy. This shows an example of a color printing device using distribution signals, and this second
The embodiment shown in the figure can also perform four-color printing in a short printing time.In addition, the signal conversion circuit 5CDa
Bkh, Y'et, Mt as printing signals.

cyt is output.

(Effects) As is clear from the detailed explanation above, in the color printing apparatus using TI/signal of the present invention, the color signal used for color printing consists only of the low frequency signal component. In addition, the black signal used for color printing is made up of only high-frequency signal components, which results in good color reproduction and details that are clearly visible in black. It is possible to easily obtain a drawing board with sharp outlines in a short printing time, and according to the apparatus of the present invention, the above-mentioned one-frame disadvantage can be satisfactorily resolved.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a container embodiment of the device of the invention. DEC-・Decoder, MrX, ・・Matrix circuit, ADCy, ADCr, ADCg, ADCb-
A/D converter, DM...Digital memory DMa...
・Anamig memory, SCD, 5CDa...signal conversion circuit, sw...changeover switch, RE...recording section (printing section), C8G...control signal generation circuit, P...paper, continuation of the first page 0 Inventor: Tsutomu Kiuchi, 3-12 Moriyamachi, Kanagawa-ku, Yokohama City, Japan Victor Co., Ltd. 0 Inventor: Shigeru Kato, 3-12 Moriyamachi, Kanagawa-ku, Yokohama City, Japan Victor Co., Ltd., 341-

Claims (1)

[Claims] The three primary color signals of red, green, and blue of the television signal are R,
G, B, and when the state in which each of the above primary color signals corresponds to a primary color with a saturation level of 100 is represented by 1, then Ye=l−B
-M=l-G, Cy〒l -RK, J: The three color signals Ye+M+cy shown respectively, and the state where the brightness signal Y of the television signal is 100% white are represented by 1. At this time, a black signal Bk as shown by Bk:l-Y is obtained, and the above-mentioned three color signals Ye, M
+Cy and the black signal Bk, respectively. In a color printing device using television signals, which is configured to perform color printing using magenta, cyan, and black inks, 3 is used for color printing.
As a color signal, one consisting only of its low frequency signal components is used, and as a black signal used for color printing, a signal consisting only of its high frequency signal components is used. (-A color printing device using a television signal characterized by