JPH0561839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transmitting color image information from an apparatus for displaying digital signals in different colors to other equipment such as a video tape recorder.

Generally, the types of colors used in computer display terminals, color fish finders, etc. are about 4 to 32 colors.
This color signal is generated by a color converter, and a digital signal for color identification is input to the color converter. That is, in such a device, the color image signal before the color converter is a digital signal for color identification, and the color image signal after the color converter is a color signal (analog signal).

By the way, the color image information of this device is NTSC.
In order to transmit the digital signal to a device to which an image transmission method such as the above-mentioned image transmission method is applied, the digital signal cannot be directly transmitted. Conventionally, therefore, a method has been proposed in which the color signal is converted into a color signal based on the NTSC system or the like and then transmitted.

However, in methods such as the NTSC method, in which image information is transmitted separately into a color signal part and a luminance signal part, the frequency bandwidth of the color signal part is usually narrow (DC to 1.5MHz in the NTSC method), so the display after transmission is The drawback was that the image quality deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for transmitting color image information without complicating a transmission system and without deteriorating display quality.

This invention is based on the fact that the frequency band of the luminance signal part of the NTSC system is relatively wide, from DC to 4MHz, and because the number of colors in devices that display digital signals by color is 4 to 32, the digital signal is This was done with a focus on the fact that it is about the size of a bit.

In the method for transmitting color image information according to claim 1 of the present invention, information on the color to be displayed in each pixel of a display image is transmitted on the transmitting side by multi-bit digital data indicating the type of the color. In addition to forming color image information, the color image information is sequentially D/A converted pixel by pixel in the horizontal and vertical directions of the image, and a horizontal synchronization signal and a vertical synchronization signal are added to the D/A converted signal. to form an analog image signal in a luminance signal frequency band and transmit it to a receiving side using a wideband luminance signal section, and on the receiving side, the received analog image signal is synchronized with a horizontal synchronization signal and a vertical synchronization signal and is transmitted to a pixel. In addition to restoring each image to color image information consisting of multiple bits of digital data indicating the type of color,
The present invention is characterized in that this color image information is converted into a display signal of the color of the information, and the signal is provided to a color image display section.

In the method for transmitting color image information according to claim 2, in claim 1, the transmitting side further inserts a reference signal for each color type into the analog image signal, and the receiving side inserts a reference signal for each color type. By restoring the analog image signal to the color image information with reference to the signal, compensation for the linearity characteristic of the transmission system is performed.

In addition, the method for recording and reproducing color image information according to claim 3 of the present invention stores color information to be displayed in each pixel of a display image using color information consisting of multi-bit digital data indicating the type of color. In addition to forming the color image information as image information, the color image information is sequentially D/A converted for each pixel in the horizontal and vertical directions of the image, and a horizontal synchronization signal and a vertical synchronization signal are added to the D/A converted signal. An analog image signal in a luminance signal frequency band is formed and recorded on a recording medium, and when the analog image signal recorded on the recording medium is reproduced, the analog image signal is synchronized with a horizontal synchronization signal and a vertical synchronization signal to form pixels. The present invention is characterized in that each image is restored to color image information consisting of a plurality of bits of digital data indicating the type of color, and is also converted into a display signal of the color of this color image information and provided to a color image display section.

The method for recording and reproducing color image information according to claim 4 further includes, in claim 3, inserting a reference signal for each color type into the analog image signal at the time of recording, and inserting a reference signal for each type of color into the analog image signal at the time of reproduction. By restoring the analog image signal to the color image information with reference to , compensation for the linearity characteristic of the recording/reproducing apparatus is performed.

In this way, when transmitting or recording/reproducing color image information in which the color of each pixel is composed of multiple bits of digital data, the present invention makes it possible to continuously change the types of colors that can be expressed. Although it can only take on a limited number of colors,
By using multiple levels of analog signals as color type information, it is no longer necessary to use a color signal section for transmitting color information or recording and reproducing color information with a limited frequency bandwidth, such as the color signal in the NTSC system. It is possible to transmit, record and reproduce high-resolution color image information using a wideband luminance signal section.

For example, if each pixel of color image information is composed of 2-bit digital data, and this 2-bit data represents color image information of 4 different colors, the following data will be obtained when recording/reproducing this. The analog signal is as shown in FIG. In FIG. 5, V ₀ , V ₁ , V ₂ , and V ₃ are signal levels for distinguishing each color type. For example, assume that 2-bit data 00 represents light blue, 01 represents green, 10 represents yellow, and 11 represents red, and by D/A conversion, data 00 represents level V ₀ , data 01 represents level V ₁ , Data 10 is converted to an analog signal of level V ₂ and data 11 is converted to an analog signal of level V ₃ . When converting such an analog signal back into digital data, for example, the original two
If the analog luminance signal is converted to bit digital data and the correspondence between the digital data and the color type is as described above, then the analog luminance signal will be light blue during the V ₀ period, green during the V ₁ period, and V ₂ period is yellow,
Each period of V ₃ will be displayed in red.

The present invention will be explained below with reference to the drawings. Note that in this embodiment, the color image information receiving device is
NTSC video tape recorder (hereinafter referred to as VTR)
).

Fig. 1 is a block diagram of the color image information transmission control section of the color image display device, Fig. 2 is a block diagram of the display control section of the same display device, Fig. 3 is a configuration diagram of the image memory, and Fig. 4 is the display screen. 5 is a circuit diagram of a portion of the transmission control section, and FIG. 6 is a block diagram of a color converter used in the display control section.

As shown in FIG. 4, the display screen is divided into M parts in the H direction and N parts in the V direction, and consists of a total of M×N pixels. Corresponding to this display screen, the image memory is composed of M×N×I memory elements as shown in FIG. Here, I indicates the storage capacity per pixel, and means that _2I colors can be displayed. In order to simplify the explanation, in this example I=
2, that is, up to 4 colors can be displayed, and the 4 colors are respectively named 0th color (for example, light blue), 1st color (for example, green), 2nd color (for example, yellow), and 3rd color (for example, red).

In Figure 4, (M-3) to (M-
The area A defined by 1) and 11 to 0 in the V direction is
This area displays reference colors for color identification of VTR playback signals. In this embodiment, the reference color is also displayed during playback to compensate for the linearity characteristics of the transmission system and the VTR itself.

In FIG. 1, the output of a clock pulse generator 2 with an oscillation frequency of ₀ (=3 MHz) is input to an H counter 3 that counts columns (in the H direction) of an image memory 1.
H counter 3 is an M ₀ (M ₀ > M) base counter, and the value is 0.
Count up to (M ₀ -1) and (M ₀ -1)
When it reaches V counter 4, it is reset with the next pulse.
Sends 1 pulse to . Repeat this action. Furthermore, as will be described later, when a predetermined value _{m 1} is loaded with the rise of the H synchronization signal extracted from the reproduced signal during playback as the load timing, counting is performed using that m ₁ as the preset value. . Note that the count value (M ₀ -1 to M) corresponds to the retrace time (blank time) in the H direction on the display screen, and in the NTSC system, when the clock frequency of the clock pulse generator 2 is set to ₀ . M ₀ = _0/15750 .

V counter 4 is an N ₀ (N ₀ > N) base counter,
The output pulse of the H counter 3 is counted from 0 to (N ₀ -1), and when it reaches (N ₀ -1), it is reset with the next pulse. Repeat this action. The count value of the V counter 4 indicates the display position of the row (V direction) of the image memory 1. This V counter is also similar to the H counter,
When a predetermined value n ₁ is loaded with the rise of the V synchronization signal extracted from the reproduction signal during reproduction as the load timing, counting is performed using n ₁ as the preset value. In addition, (N ₀
-1 to N) correspond to the retrace time (blank time) in the V direction on the display screen, and also correspond to the NTSC
In the scheme, N ₀ =262.

The image memory 1 stores color image information, and the image information is digital information for identifying colors in each pixel. This information is given by a CPU or hard logic (not shown), and is written during the blank period corresponding to the H (horizontal) retrace period or V (vertical) retrace period of the display screen, and is always written outside the blanking period. It is being read. Image information is read out by the H counter 3 and V counter 4. That is, since the H and V counters indicate the address of the image memory 1, image information is continuously read out in accordance with updating of this address. In this case, when the H counter 3 has a count value of (M ₀ -1 to M) or the V counter 4 has a count value of (N ₀ -1 to N), the read mode must be changed to the write mode. This is done by a display blank signal generated by. Therefore, this blank signal is stored in image memory 1.
On the other hand, it is input as a mode switching signal to the switch 20 that switches between a write address and a read address.

ROM1, ROM2, and switch 9 are circuits that generate reference image information for displaying the aforementioned reference colors. ROM1 is a memory that inputs the count value of V counter 4 as an address and outputs the contents specified by the address.When the value of V counter 4 is between 0 and 2, it is 0 (a digital signal corresponding to the 0th color, Outputs “00” (expressed in binary code),
When the value of V counter 4 is 3 to 5, it outputs 1 (a digital signal corresponding to the first color, which is "01" if expressed in binary code), and when the value of V counter 4 is 6 to 8
When V
When the value of the counter 4 is between 9 and 11, it outputs 3 (a digital signal corresponding to the third color, which is "11" if expressed in binary code). (See area A in Figure 4).
ROM2 also inputs the count values of H counter 3 and V counter 4, and the count value of H counter 3 is M-3.
~M-1, this memory outputs 1 when the count value of the V counter 4 is 0 to 11, and outputs 0 otherwise. ROM1 inputs only the count value of V counter 4 and outputs 0 to 3, so its storage capacity is N ₀ × 2, and ROM2 inputs count values of V counter 4 and H counter 3, so , its storage capacity is M ₀ ×N ₀ ×1. The switch 9 is driven by the output of the ROM 2, and its
When the ROM output is 1, it is connected to the ROM1 side, and when it is 0, it is connected to the image memory 1 side.

ROM3 and ROM4 are memories that output a display blanking signal and a synchronization signal, respectively, and the H counter 3 and V counter 4 reach a predetermined count value, that is, a count value corresponding to the blanking period or a count value corresponding to the time of forming the synchronization signal. Outputs 1 when it becomes full, and outputs 0 otherwise. storage capacity is
In both ROMs 3 and 4, the input is the count value of the H counter 3 and the V counter 4, and the output is 0 or 1, so M ₀ ×N ₀ ×1.

The switch 11 is driven by the output of the ROM 3, and when the blanking signal is output, the adder 1
It operates so that the signal from the image memory 1 is not output to the image memory 2.

A D/A converter 10 connected to the output side of the switch 9 converts the output signals (image information) of the image memory 1 and ROM 1 into D/A, and inputs I (two in this embodiment) input signals. One output is formed for each. The D/A converted analog signal is guided to a switch 11 controlled by a switching signal from the ROM 3, and further inputted from the switch 11 to an adder 12.

The adder 12 receives an analog image signal from the D/A converter, a blanking signal from the ROM 3,
This is a circuit for synthesizing synchronization signals from ROM4. As shown in FIG. 5, this adder 12 is
It is composed of two high-speed operational amplifiers 120 and 121 and several constants for setting amplification factors. The output of the operational amplifier 121 is set so that the analog video signal is on the positive side centered on the V ₀ level as shown in the figure.
Also, the blanking signal and synchronization signal are placed on the negative side. Also, among analog video signals, the V ₀ level is the 0th color (light blue), the V ₁ level is the 1st color (green), the V ₂ level is the 2nd color (yellow), and the V ₃ level is the 3rd color (red). The blanking signal corresponds to the _VB level. The signal from the adder 12 is input as is to the VTR 13 via the transmission line. Here, the read frequency from the image memory 1 is the output frequency of the clock pulse generator 2, ₀ , that is, 3 MHz, so in the NTSC system, this image signal is regarded as a luminance signal and is input to the VTR 13. On the other hand, since the brightness signal frequency bandwidth of the VTR 13 is 0 to 3MHz,
The input image information is recorded without deterioration of linearity. In this way, the image information stored in the image memory 1 and the reference image information stored in the ROM 1 are transmitted to the VTR at a relatively high frequency.
Recorded on the 13th.

In this embodiment, image monitoring can be performed in parallel with the recording operation described above. That is, in FIG. 2, the output i of the switch 9 and the output c of the ROM 3 are supplied to the color converter 16 through the switch 15 connected to the R contact during recording (hereinafter referred to as R mode), and In the R mode, the synchronizing signal (including the horizontal synchronizing signal and vertical synchronizing signal) from the ROM 4 is sent to the horizontal deflection circuit 18 through the switch 21 connected to the R contact. 19, and the recorded images are simultaneously monitored by the CRT 17.

The color converter 16 converts R, G, and B of the CRT 17 into digital signal image information (digital signal for color identification) and blanking signal.
Drive the terminal with an analog signal of a predetermined size,
This circuit forms R, G, and B color signals, and includes a ROM, a D/A converter, and an amplifier corresponding to each color (see FIG. 6).

Next, the operation during playback will be explained.

The output signal a of the VTR 13 in FIG. 1 is a mixture of analog image information, a blanking signal, and a synchronizing signal. This mixed output a is input to sample and hold circuits S/H0-4 and comparators 0-3 which separate image information of each color according to the magnitude of the output amplitude (see FIG. 2). As will be described later, the sample and hold circuit is a circuit for sampling and holding the reference image information being mixed and output.

The mixed output is further amplified by an amplifier 23, and inputted to the sync separation circuit 22 via a switch 21 connected to the B contact during playback (hereinafter referred to as B mode), where the H (horizontal) and V (vertical) synchronization signal is connected to the horizontal and vertical deflection circuits 18,1
9 is input. In this B mode, the signal is guided to the H counter 3 and V counter 4 via the switch 14 connected to the B contact in FIG. As described above, predetermined values m ₁ and n ₁ are loaded into the H counters 3 and 4 at the rising edge of the signal. These predetermined values m ₁ and n ₁ are the start positions of the H and V synchronization signals stored in the ROM 4. That is, the count value of the H counter 3 is m ₁ to _{m 2}
If the H synchronization signal is set to be output from ROM4 during
m ₁ , and the count value of V counter 4 is n ₁
When the V synchronization signal is set to be output from the ROM 4 during the period of _.about.n2 , the value to be loaded into the V counter 4 is set to _n1 .

The thus loaded value is supplied to the matching circuit 24 while being counted up in FIG. The matching circuit 24 has five independent comparison circuits built therein, and calculates the count values of the counters 3 and 4 corresponding to the center position considered to be the least distorted position of each color in the reference color area A in FIG. and the count values of counters 3 and 4 corresponding to the blanking signal position are stored in advance as comparison values of five comparison circuits, respectively. For example, for the first color, M-2 is stored as the comparison value for the H counter output, 4 is stored as the comparison value for the V counter output, and for blank, M+1 is stored as the comparison value for the H counter output, and M+1 is stored as the comparison value for the V counter output. 1 is stored as the output comparison value. These comparison outputs become 1 when the respective input counter values match the above-mentioned comparison values, and become 0 otherwise. Also, for each comparison output, the output corresponding to the 0th color is S/H0, and the output corresponding to the 1st color is S/H0.
The output corresponding to the color is given to S/H1, the output corresponding to the second color is given to S/H2, the output corresponding to the third color is given to S/H3, and the output corresponding to the blanking signal is given to S/H4. It will be done. In other words, S/H0 is the 0th
When the center position of the reference color area of a color is specified (by counters 3 and 4), a sample signal is received from the matching circuit 24, the image information from the VTR 13 is sampled, and similarly S/H1 to S/H3 are also receive sample signals from the matching circuit 24 when the center positions of the reference color areas of the first to third colors are specified, respectively.
The S/H4 samples the image information from the VTR 13, and when the blanking signal position is designated, the S/H4 receives the sample signal from the matching circuit 24 and sends it to the VTR.
Sample the image information from 13. On the other hand, as mentioned above, the H counter 3 has the value _m1 corresponding to the rising position of the H synchronizing signal, and the V counter 4 has the value _n1 corresponding to the rising position of the V synchronizing signal, and the VTR output has the value m1 corresponding to the rising position of the H synchronizing signal. Since it is set at the rising edge of the sync signal and V sync signal when it appears,
During VTR playback, the count values of H and V counters 3 and 4 are synchronized with the VTR output. Therefore, when a sample signal is output from the matching circuit 24, the sample hold circuit that receives the signal introduces VTR image information of the reference color specified by the sample signal. In this way, the reference color information in the VTR playback signal is determined. Note that each sample and hold circuit holds a
Samples the VTR playback signal, but holds the sampled value at other times.

This held reference color information is used to extract image information from the reproduced signal. As already mentioned,
During recording, D/A conversion is performed with the 0th color as V ₀ level, the 1st color as V ₁ level, the 2nd color as V ₂ level, the 3rd color as V ₃ level, and the blanking signal as V _B level. , the reproduced image information approaches either of these levels. Relatively, the V _B level is the lowest, and the levels increase in the order of V ₀ , V ₁ , V ₂ , and V ₃ . Adders 5 to 8 are circuits that calculate a threshold value by adding 1/2 of the hold value of the reference color information in accordance with the relationship between the levels. FIG. 7 is a diagram showing the relationship between this threshold value and the above-mentioned hold value. Adder 8 adds the hold value (blanking signal) _V'B of S/H4 and the hold value (0th color image information) V'0 of S/H0, and further divides by ₂ to obtain the threshold value. Find 1/2 (V′ ₀ +V′ _B ). Adder 7 adds the hold value of S/H0 (0th color image information) V' ₀ and the hold value of S/H1 (1st color image information) V' ₁ , and further divides by 2. Threshold 1/2 (V′ ₁ +
V′ ₀ ). Similarly, adder 6 calculates the threshold value 1/2 (V' ₂ +V' ₁ ), and adder 5 calculates the threshold value 1/2.
Find (V′ ₃ +V′ ₂ ). Comparing circuits 0 to 3 to which the reproduced signal is input compare the respective threshold values and the reproduced signal. Threshold 1/2 (V′ ₁
+V' ₀ ) and above the threshold value 1/2 (V' ₀ +V' _B ), if there is a signal within level a (see FIG. 7), the comparator circuit 0 outputs 1. Similarly, if the reproduced signal has a signal within level b, the comparator circuit 1 outputs 1. Further, the comparison circuit 2 outputs 1 for a signal within level c, and the comparison circuit 3 outputs 1 for a signal within level d. By doing this, signals within level a can be estimated as approximately 0th color image information, signals within level b can be estimated as first color image information, and signals within level c can be estimated as second color image information. , the signals within level d can be estimated as third color image information, respectively.

The ROM 5 is a memory circuit that encodes the outputs from the comparison circuits 0 to 3 mentioned above and converts them into signals similar to the digital signals stored in the image memory 1. It is supplied to a color converter 16 via a switch 15 that switches to a contact point. FIG. 8 shows a conversion table by the ROM5. In FIG. 8, the upper row of the conversion table shows the possible values of the 4-bit data output from the four comparison circuits 3, 2, 1, and 0 shown in FIG. 4 bits are shown in the vertical direction), and the lower row shows the 4 bits.
The figure shows 3-bit output data from the ROM 5 when bit data is input as address information. In other words, the 2 ¹ and 2 ⁰ outputs are 2 corresponding to the color type.
It is digital data of bits, and the ²⁰ output is its lower bit, and the ²¹ output is its upper bit. Another 1-bit data “Blanking output”
is a blanking signal to the color converter 16 via the switch 15. For example, if the output of 4 bits of comparator circuit 3, comparator circuit 2, comparator circuit 1, and comparator circuit 0 is 1111, the digital data is output from ROM5.
110 (2-bit digital data 11 corresponding to the color type and blanking signal data 0), and if the outputs of the comparison circuits 3, 2, 1, and 0 are, for example, 0011, the digital data 010 ( 2-bit digital data 01 and blanking signal data 0) corresponding to the color type are generated. Also, the outputs of comparison circuits 3, 2, 1, 0 are
If 0001, digital data 000 from ROM5
(2-bit digital data 00 and blanking signal data 0 corresponding to the type of color) are generated. If the outputs of the comparison circuits 3, 2, 1, and 0 are 0000, the output of the ROM 5 becomes 001, and a blanking signal is generated. (At this time, the 2 ¹ and 2 ⁰ outputs of the ROM 5 are 00, but since they are blanked, they have no meaning as information representing the color type.) As described above, during VTR playback, the predetermined value m _{1 .} That is, even if the linearity and attenuation characteristics of the VTR 13 and the transmission system are somewhat poor, it is possible to reproduce colors with high precision up to the pre-transmission state stored in the image memory 1.

On the other hand, analog image information that has been D/A converted is
Since it is transmitted at a relatively high frequency of 3MHz, there is almost no deterioration in image quality during playback. Therefore, there is almost no difference between the image quality monitored during recording and the reproduced image quality. In this way, in this embodiment, color image information can be recorded on a VTR using a simple circuit without deteriorating image quality, and since reference color image information is simultaneously recorded, distortion in the transmission system and VTR can be avoided. It has the advantage of being able to compensate for such things. FIG. 9 is a time chart for recording and playback when the count value of the V counter 4 is 7. As shown in FIG. 9, during recording, if the output of the ROM 2 is 1, that is, the "H" level (high level), the contents of the ROM 1 are converted into an analog signal by the DA converter 10. In this example, digital data representing the type of second color shown in FIG. 4 is output from the ROM1.
If the output of the ROM 2 is 0, that is, the "L" level (low level), data corresponding to the output data of the image memory 1 is converted into an analog signal. Also
When the output of the ROM 3 is 1, that is, at the "H" level, it is a blanking period and a blanking signal is generated. Further, when the output of the ROM 4 is 1, that is, at the "H" level, a horizontal synchronizing signal is generated.
During playback, the horizontal synchronization signal included in the signal output from the VTR is separated by the synchronization separation circuit 22 as a horizontal synchronization signal. In the example shown in FIG. 9, the sample signal for the sample and hold circuit S/H2 of the matching circuit 24 is H=M-2, V
= 7, which is generated at the timing of the center dot among the _nine dots of second color reference signals in FIG. The sample will be held.

Note that since the reference color does not necessarily have to be displayed on the screen, the reference signal may be inserted in a period other than the period in which the color image information is actually displayed on the screen. Furthermore, the receiving device for transmitted image information does not have to be an NTSC VTR, but may be a PAL or SECAM VTR. In short, the receiving device may be an image information receiving device as long as it has a frequency characteristic with a narrow bandwidth for receiving a color signal and a frequency characteristic with a wide bandwidth for receiving a luminance signal.

As detailed above, according to the present invention, R,
High-quality color images can be easily transmitted without transmitting G and B color signals individually. Also, if the receiving device is an NTSC VTR,
If the recorded information is color information that corresponds to the level proportional to the reflection intensity or temperature of a color fish finder or thermograph, it should be played back on a general home NTSC color TV instead of using a dedicated color monitor TV. You can also use it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a color image information transmission control section in a display device embodying the present invention, FIG. 2 is a block diagram of a display control section of the same display device, FIG. 3 is a configuration diagram of an image memory, and FIG. 4 5 is a block diagram of a display screen, FIG. 5 is a circuit diagram of a portion of the transmission control section, and FIG. 6 is a block diagram of a color converter used in the display control section. Also, Fig. 7 is a diagram explaining the method for color identification of VTR playback signals (analog image information), and Fig. 8 is a diagram that explains how to perform color identification of VTR playback signals (analog image information).
The ROM image information conversion table, FIG. 9, shows time charts for recording and playback in a predetermined state.

Claims (1)

[Claims] 1. On the transmitting side, information on the color to be displayed in each pixel of the display image is formed as color image information consisting of multi-bit digital data indicating the type of color, and the color image information is Sequentially performs D/A conversion for each pixel in the horizontal and vertical directions of the image,
A horizontal synchronization signal and a vertical synchronization signal are added to this D/A converted signal to form an analog image signal in the brightness signal frequency band in the television system, and the analog image signal is transmitted to the receiving side using a wideband brightness signal section. , on the receiving side, restores the received analog image signal to color image information consisting of multi-bit digital data indicating the type of color for each pixel in synchronization with a horizontal synchronization signal and a vertical synchronization signal;
A method for transmitting color image information, comprising converting this color image information into a display signal of the color of the information and providing it to a color image display section. 2. According to claim 1, the transmitting side inserts reference signals of various colors into the analog image signal, and the receiving side refers to the reference signals to restore the analog image signal to the color image information. A method for transmitting color image information. 3 Information on the color to be displayed in each pixel of a display image is formed as color image information consisting of multiple bits of digital data indicating the type of color, and the color image information is transmitted for each pixel in the horizontal and vertical directions of the image. Sequential D/A conversion, this D/A
A horizontal synchronization signal and a vertical synchronization signal are added to the converted signal to form an analog image signal in the brightness signal frequency band in the television system and recorded on a recording medium, and the analog image signal recorded on the recording medium is During playback, the analog image signal is restored to color image information consisting of multi-bit digital data indicating the type of color for each pixel in synchronization with the horizontal synchronization signal and vertical synchronization signal, and the color of this color image information is 1. A method for recording and reproducing color image information, comprising converting the signal into a display signal and applying the converted signal to a color image display section. 4. Color according to claim 3, wherein reference signals of various colors are inserted into the analog image signal during recording, and the reference signals are referred to during playback to restore the analog image signal to the color image information. A method for recording and reproducing image information.