KR790001240B1 - Color analysing filter for color photographing - Google Patents

Abstract

A color imaging device for forming the color analyzed image of a material, obtaining the combined signal of an illuminating signal and a color carrier signal, has a good feature in removing the level unbalance of the illuminating signal by a color anlayzing device. The color analyzing filter comprised of two filter strips diagnoally intersecting each other. The area of one filter passes through all kinds of color, and is wider than the other filter passes through only one color.

Description

Color separation filter for color imaging

1 is a diagram of an example of a color separation filter.

2 is a waveform diagram of a signal obtained therefrom.

3 and 4 are diagrams for explaining the nonlinearity of the image pickup tube.

5 is a view of an example of a decomposition filter according to the present invention.

6 and 7 show examples of the manufacturing method.

8 is a diagram of another example of a color separation filter according to the present invention.

9 shows the frequency spectrum of the signal thus obtained.

10 is a vector diagram for explaining a signal obtained by the filter.

11 is a schematic diagram of an example of a demodulation circuit.

12 is a waveform diagram for explaining the acupuncture diagram.

13 and 14 are schematic diagrams of an example of an NTSC encoder, respectively.

15 and 16 are views of another example of the color separation filter according to the present invention, respectively.

17 is an explanatory diagram of a relationship between a color separation filter and an electron beam.

18 shows the frequency spectrum of the obtained signal.

19 is a schematic diagram showing another example of a demodulation circuit.

In the color image pickup device, a color separation image of a subject is formed by a color separation filter, and the color separation image is picked up by a single image pickup tube to obtain a composite signal of a luminance signal and a color signal (carrier color signal) from this.

That is, in the color separation filter, as shown in FIG. 1, stripe S _W for transmitting all color light and stripe S _X for transmitting only predetermined color light are alternately arranged, and the color separation image formed therefrom is imaged. Thus, as shown in FIG. 2, a composite signal E _i from the image pickup tube with the color signal C _i of the carrier frequency corresponding to the pitch of the luminance signal Y _i and the stripes S _W and S _X is obtained. In this case, in general, the stripe S _w and S _X have the same width in the horizontal scanning direction, so that the duty factor of the color signal C _i becomes one to one, and the luminance signal Y _i and the color signal C _i And are at the same level.

By the way, in such an imaging device, the imaging tube is considered to be an optical-electric conversion means, but its conversion characteristic is generally nonlinear, and hence level instability occurs in the luminance signal for the following reasons.

That is, as shown in FIG. 3, the imaging tube 12 is an abnormal imaging tube 101 without non-linearity and a signal transmission circuit 102 having non-linearity in input / output characteristics. Assuming that the non-linear characteristics of the circuit 102 are represented by the curve of FIG. 4, in the imaging tube 101, a combined signal E ₀ between the luminance signal Y ₀ and the color signal C ₀ which is not affected by non-linearity is obtained. It can be seen that the transmission signal 102 is made of a composite signal E _i with the color signal C _i of the luminance signal Y _i affected by the nonlinear characteristic.

In this case, however, when the color signal C ₀ passes through the transmission circuit 102, the color signal C ₀ is detected due to the nonlinear characteristic 103. The detection signal is only a luminance signal, and by this detection action, the luminance signal is mixed with the original luminance signal Y ₀ . That is, the color signal C ₀ is detected by the nonlinear characteristic 103 to form a luminance signal, and a mixed signal of the luminance signal and the original luminance signal Y ₀ is obtained as the luminance signal Y _i .

And when referred to a half of the width of the stripe of the color separation filter pitch, the fourth, as shown in Figure, signals E ₀ (when a one-dot chain leader) of the level of the luminance signal Y ₀ is the peak-to-peak of the color signal C ₀ ( peak to peak) level, but in the case of the nonlinear characteristic 103, the level of the luminance signal Y _i in the signal E _i (single-dotted line display) by the detection action is the peak-to-peak level of the color signal C _i . Increases more than 1/2 (dotted line) of. Since this but increase the color signal C ₀ detection luminance signal minutes formed doemeurosseo, the higher the level of the increment signal E ₀ As is apparent from the drawing, that is, the subject (11) The brighter significantly, this results level to a luminance signal Y _i This imbalance results in uneven luminance on the playback screen.

When the nonlinear characteristic of the transmission circuit 102 is represented by the curve 104, the level of the luminance signal Y _{i in} the signal E _i decreases than half of the peak to peak level of the color signal C _i , and the decrease is The higher the luminance is, the more the luminance unstable is formed.

The present invention is intended to solve the level unbalance of the luminance signal by the color separation filter.

Therefore, the filter according to the present invention is such that the area of the portion that transmits all the color light is sufficiently large, that is, the width of the stripe including the portion that destroys all the color light is larger than half of the pitch.

In other words, the characteristics of the filter of FIG. 5 will be described. S _B , S _R , and S _G are stripes that transmit blue, red, and green color light, respectively, with respect to the extending directions of the stripes S _R , S _G, and stripe S _B. It extends in a direction inclined by Q _{1 in} opposite directions. This filter causes the electron beams to i-1, i, i + 1,... … … But arranged to scan the array direction of the stripes corresponding to the stripe S _B on the color separation, the pitch in a direction corresponding to the scanning direction of the beam of these stripe S _B, S _R, and S _G as indicated by each other Furthermore, the width in one direction becomes 2/3 of the pitch in this direction, respectively.

Therefore, the parts attached with R, B, and G pass through only the color light of red, blue, and green, and the parts attached with RB, RG, and GB correspond to red and blue (ie magenta), red and green (ie yellow), The part which added W through green light and blue (namely cyan), respectively, passes through all the color light, and the area of this part is large enough. The hatched portion does not overpower all the colored lights.

Further, if the distance between positions corresponding to the beam dice merged adjacent to each other is d,

Becomes

In this case, if the effective scanning surface of the photoelectric conversion surface of the imaging tube is, for example, a size of 9 mm x 12 mm in which the length-to-width ratio is 3: 4, for example, it corresponds to the stripe S _B in this effective scanning surface. In order to form 186 stripe images, the pitch P described above is 12 mm / 186, i.e. 64 µ, in terms of the photoelectric conversion surface. If the effective scanning player is 250, the above-mentioned distance d is 9mm / 250 or 36 mu in terms of the photoelectric conversion surface. Therefore, in the above example, θ is selected to be about 30.6 °.

Of course, if the ratio between the longitudinal and lateral sides of the effective scanning surface is not 3: 4, for example, 1: 2, the inclination angle θ ₁ will be changed accordingly.

In the case of interlaced scanning, the position corresponding to the beam dice in the next field is i-1, i, i + 1,... … … It goes without saying that between the positions indicated by.

Such a filter can be obtained by the same method as in FIG. 6 or 7.

In other words, Fig. 6 is based on the principle of the additive color method, in which a reversal type color film 2 is placed in the camera 1, and first, as shown in Fig. A, A filter 3 having a stripe that does not transmit all color light indicated by BL is arranged to cross each other in a width of 2 to 1 is photographed through the blue filter 6B to expose the film 2 to the stripe with blue light. . In addition, as shown in FIG. 2B, the filter 4 in which the stripe extends inclined with respect to that of the filter 3 is photographed through the green filter 6G, and the film 2 is exposed to the stripe with green light. do. In addition, as shown in FIG. 3C, the filter 5 having the inclination direction of the stripe opposite to that of the filter 4 is photographed through the red filter 6R, and the film 2 is exposed to the light on the stripe with red light. . When the film 2 is developed, the filter as described above is obtained.

7 is a case of the principle of the blue color method, in which a stripe that transmits red or green color light indicated by RG as shown in FIG. The filter 7 to be cross-arrayed, the stripe which transmits the red or blue color light indicated by RB as shown in FIG. In addition, the stripe is a filter 8 inclined with respect to that of the filter 7, and a stripe that transmits all the color light indicated by the stripe W, which transmits the blue and green color light indicated by BG as shown in FIG. The crosswise arrangement of the widths of one to two and the inclination direction of the stripe are overlapped with the filter 9 opposite to that of the filter 8 as shown in FIG. Thus, the three filters 7 to 9 are combined in duplicate to form the filter as described above.

In the example of FIG. 8, the width of the stripe S _B , S _R , S _G becomes 3/4 of the pitch, so that the area of all of the color light passing through W is larger than the example of FIG. 5 and any color light passes. In this case, the slopes of the stripes S _R and S _G are the same as those of FIG. 5.

According to such a color separation filter, the amount of white light transmission increases, so that the frequency spectrum of the synthesized signal E _i from the image pickup tube 12 is as shown in FIG. 9, and the level of the color signal C _i is the level of the luminance signal Y _i . Become smaller than. At this time, since the level of the color signal C ₀ from the abnormal imaging tube 101 is smaller than the level of the luminance signal Y ₀ , the color signal C ₀ is detected by the nonlinear characteristic 103 of the transmission circuit 102. however, the level of the luminance signal formed by the detector is therefore small relative to the original level of the brightness signal Y ₀ of this effect to the luminance signal Y ₀ by are getting almost not, therefore chwalsanggwan 12 the level imbalance with little The luminance signal Y _i can be obtained.

Next, a color imaging method using the above-described color separation filter will be described.

That is, when the subject is color-separated by each of the above-described filters and the color-decomposed image is projected on the photoelectric change plane of the image pickup tube and scanned as an electron beam, as long as it corresponds to the scanning direction of the electron beams of the stripes S _R , S _B , and S _G , respectively. Since the pitches of the directions are the same, each color signal component of red, blue, and green is obtained as a signal carrierized at the same carrier frequency. Moreover, the directions of inclination of the stripes S _R , S _B , and S _G are different from each other. The phase difference with respect to the horizontal scanning interval to be summed is different for each color signal component.

For example, in the case where the pitch P is selected as described above, the carrier frequency fc of each color signal component is 3.58 MHz in any of the filters, and the synthesized signal E _i obtained in the image pickup tube at any i-th horizontal scanning section is

는 휘도신호이므로, 이것을 Y_i로 표시하고, 또Is displayed. And in this equation

Since is a luminance signal, this is expressed as Y _i , and

는 색신호이므로, 이것을 C_i로 표시한다. 여기서 m과 n은 스트라이프의 피치 및 폭으로 정해지는 정수,

_R,

_B및

_G는 초기 위상각이고, 제 5 도의 예에서 m=3, n=2이고, 제 8 도의 예에서 m=4, n=3이다.If

Since is a color signal, denote it as C _i . Where m and n are integers determined by the pitch and width of the stripe,

_R ,

_B and

_G is the initial phase angle, m = 3, n = 2 in the example of FIG. 5 and m = 4, n = 3 in the example of FIG.

진행하고, 청색신호성분에 있어서는 인접하여 합해진 수평구간에의 위상차가 0으로 되고, 녹색신호성분에 있어서는 다음의 수평구간에 대해서 앞의 수평구간에 대해 위상이 2/3

지연된다.As shown in the column of the original signal of FIG. 10, the red signal component has a phase of 2/3 of the previous horizontal section for the next horizontal section.

In the blue signal component, the phase difference between adjacent horizontal sums becomes 0, and in the green signal component, the phase is 2/3 of the previous horizontal section with respect to the next horizontal section.

Delay.

를 분리할 수 있다.Therefore, if appropriate abnormality and arithmetic operation are performed in the color signal components in three adjacent horizontally synthesized horizontal sections, each of the color signal components of red, blue, and green

Can be separated.

The specific configuration thereby is shown in FIG. 11 as an example. In other words, 11 denotes a subject, 12 denotes an image pickup tube, a main lens 13 is disposed on an optical path therebetween, and a color separation shown in FIG. The filter 14 is arranged to form a color separation image of the subject 11. At the same time, the color separation image is projected onto the photoelectric conversion surface of the image pickup tube 12 by the field lens 15 and the relay lens 16, and the synthesized signal E according to the above-described formula (10) in the i + 1th horizontal period therefrom. get _i +1 Also in this example, fc is 5 MHz.

The signal E _i +1 thus obtained is supplied to a low pass filter 21 having a band of 0-4 MHz to take out the luminance signal Y _i +1 and supply it to the delay line 22 to delay i + by one horizontal period. The luminance signal Y _i is obtained in the first horizontal period. In addition, the signal E _i + 1 from the image pickup tube 12 is supplied to a band pass filter 24 having a band of 4-6 MHz, and the color signal C _i + 1 is taken out, and the delay lines 25 are delayed by one horizontal period, respectively. ) And (26) sequentially to obtain the color signal C _i from the delay line 25 in the i + 1th horizontal period, and obtain the color signal C _i -1 from the delay line 26. Therefore, in the filter 24, the delay lines 25 and 26, the color signals C _i + 1, C _i and C _i- 1 are obtained simultaneously.

지상시키는 이상기(31)을 통하여, 색신호 C_i는 그대로, 또 색신호 C_i-1은 2/3

진상(進相)시키는 이상기(移相器)(32)를 통해 각각 가산기(37)에 공급된다. 따라서 가산기(36)에 공급되는 색신호 C_i+1, C_i및 C_i-1중의 각 색신호성분의 위상관계는 제 10 도의 제 2 란에 표시한 바와같이 된다. 즉 적색신호성분

은 모두 동상으로 되고, 청색신호성분

은 서로 2/3 위상차로 되고 또 녹색신호성분

에는 서로 2/3

위상차로 된다. 따라서, 가산기(37)에서 청색신호 성분은 서로 상쇄되고 또한 녹색신호 성분도 서로 상쇄되므로 가산기(37)에서는 적색신호성분

의 가산신호가 얻어진다. 또한, 이들 성분

및

은 성분

와 거의 같으므로, 이 가산신호는 적색신호성분

이다.The color signal C _i +1 of the color signals obtained in this manner is 2/3

The color signal C _i remains unchanged and the color signal C _i- 1 is 2/3 through the phase-out phaser 31.

The feeders 37 are supplied to the adders 37 through the phase shifters 32 that advance. Therefore, the phase relationship of each color signal component among the color signals C _i + 1, C _i and C _i -1 supplied to the adder 36 is as shown in the second column of FIG. Red signal component

Are all in phase, blue signal component

Are two thirds of the phase difference and the green signal

There are 2/3 of each other

It becomes a phase difference. Therefore, in the adder 37, the blue signal components cancel each other and the green signal components cancel each other.

The addition signal of is obtained. In addition, these components

And

Silver ingredients

Since this is almost the same as, the addition signal is the red signal component.

to be.

The red signal component 3R _i thus obtained is envelope-detected by the detection circuit 41 to obtain a red signal R _C.

은 서로

위상차가 있고, 청색신호 성분

은 서로 동상으로 되고 또 녹색신호 성분

및 G_i-1은 서로 2/3

의 위상차가 있으므로 가산기(38)에서는 청색신호성분 3B_i가 얻어진다. 이 청색신호성분 3B_i는 검파회로(42)에서 포락선 검파하여 청색신호 B_C를 얻는다.In addition, the color signals C _i + 1, C _i and C _i −1 obtained at the same time from the filter 24, the delay lines 25 and 26 are supplied to the adder 38. In this case, the red signal component as shown in the third column of FIG.

Are each other

Phase difference, blue signal component

Are in phase with each other and the green signal

And G _i- 1 are 2/3 of each other

Since there is a phase difference in, the adder 38 obtains the blue signal component 3B _i . The blue signal component 3B _i is envelope-detected by the detection circuit 42 to obtain a blue signal B _C.

진상시킨 이상기(33)을 통해 지연선(25)에서의 색신호 C_i를 그대로 하고, 또 지연선(26)에서의 색신호 C_i-1을 2/3

지상시킨 이상기(34)를 통하여 각각 가산기(39)에 공급한다. 이 경우에는 제 10 도의 최하란에 표시한 바와같이, 적색신호성분

은 모두 2/3

의 위상차로 되고, 청색신호성분

도 모두 2/3

의 위상차로 되지만, 녹색신호성분

은 모두 등상으로 되므로, 가산기(39)에서의 녹색신호성분

가 얻어진다. 이 녹색신호성분

는 검파회로(43)에서 포락선 검파하여 녹색신호 G_C를 얻는다.In addition, the color signal C _i +1 of the filter 24 is 2/3.

Through the advanced phaser 33, the color signal C _i at the delay line 25 is kept as it is, and the color signal C _i- 1 at the delay line 26 is 2/3.

The feeders 39 are supplied to the adders 39 through the grounded phase shifter 34. In this case, as indicated in the bottom column of FIG. 10, the red signal component

Is all 2/3

Becomes a phase difference of and the blue signal component

2/3 of all

Phase difference, but the green signal component

Since all become equiphase, the green signal component in the adder 39

Is obtained. The green signal component

Detects an envelope in the detection circuit 43 to obtain a green signal G _C.

In this case, the delay time of the delay line 22 is one horizontal period and the luminance signal Y _i is that the three primary color signals R _C , B _C and G _C are the color signals C _i +1, C _i and C _i -1. so obtained, is to match the three primary color signals R _C, G _C and B _C, and temporal relationship corresponding to the luminance signal Y by _i in. For this reason, in the simple type, it is not always necessary to do this. In this case, the delay time of the delay line 22 corresponds to the time delay of the color demodulator.

By the way, in such a single-tube type color image pickup device, the band of the luminance signal Y _i is limited and the sharpness tends to be lowered. In addition, since the center of the photoelectric conversion surface and the optical system of the imaging tube 12 has the highest resolution and the color is faint at the periphery, the sharpness of the three primary color signals may be reduced or color shading may occur.

For this reason, in this example, a sharpness improvement circuit for reducing the sharpness drop in the luminance signal Y _i and a circuit for correcting the three primary color signals are provided.

In other words, the sharpness improvement circuit is to improve the sharpness by attaching the Fourier and Overshoot to the luminance signal Y _i , and thus the three primary color signals R _C and B _C in the detection circuits 41, 42 and 43. And G _C are supplied to the adder 54 to obtain the luminance signal Y _C. In this case, since the band of the color signal C _i is relatively narrow, the band of the luminance signal Y _C is also relatively narrow (see FIG. 9), and if the luminance signal Y _i is a square wave as shown in the 12th degree, the luminance signal Y _C is equal to As indicated by the solid line, the up and down signals are loose. The luminance signal Y _C is supplied to the subtractor 51 by the attenuator 55 at a predetermined level as indicated by the dotted line in the b diagram b, and the luminance signal Y _C is subtracted from the luminance signal Y _i .

Therefore, the subtractor 51 obtains the luminance signal Y _W with improved sharpness in the horizontal direction, to which the Four-Shoot and the Overshoot are attached, as shown in FIG. In this case, the luminance signal Y _C is obtained based on the color signals C _i +1, C _i , C _i -1 in three horizontal periods i + 1, i, i-1, so that the sharpness in the horizontal direction Sharpness in the vertical direction is also improved.

Again, a calculation circuit 56 is provided as a correction circuit for the three primary color signals, and the three primary color signals R _C , B _C and G _C from the detection circuits 41, 42, and 43 and the subtractor 51 are provided. At the same time as the luminance signal Y _W and the luminance signal Y _C from the adder 54 is supplied as a predetermined level by the athene following the athene 57, and the arithmetic circuit 56

K

1이다.Operation is performed. In this case, the signals R _C , B _C , G _C and Y _C have a relatively narrow band as described above, and one signal Y _W has a wide band, but converts the three wide color primary signals into R _W , B _W and G _W. (R _W + B _W + G _W = Y _W ), generally R _W = KR _C , B _W = KB _C and G _W = KG _C. Where K is a coefficient that changes by a blurred state of the phase of each part on the photoelectric conversion surface of the imaging tube 12, and is 0

K

1

Therefore, when the above calculation is performed in the calculation circuit 56, the levels of the three primary colors R _C , B _C and G _C become constant regardless of the value of K, that is, the three primary colors having a high resolution regardless of the blurred state. Signals R _W , B _W and G _W. In addition, color shading does not occur because of constant level. The high resolution obtained in this way, that is, the wideband three primary color signals R _W , B _W and G _W are supplied to the NTSC encoder 60, for example.

/2 어긋난 적색차신호에 의한 평형변조신호를 얻는다. 그리고 변조기(63) 및 (65)로부터의 청 및 적색차신호에 의한 각평형변조신호를 가산기(66)에 공급하여 가산하고, 적 및 청색차 신호에 의한 직각 2상 평형복조신호를 얻음과 동시에, 이 가산기(66)에는 가산기(61)로부터 휘도신호 Y_W를 공급하고, 또 신호발생기(67)로 부터 수직 및 수평동기신호와 버스트(burst)신호를 공급하고, 이렇게 하여 가산기(66)으로부터 NTSC 방식에 의한 칼라영상신호를 얻고, 이것을 출력단자(68)에서 취출한다.The NTSC encoder 60 is configured as in the thirteenth diagram. That is, the three primary color signals R _W , B _W , and G _W from the correction circuit 56 are supplied to the adder 61 to obtain a wideband luminance signal Y _W , which is added from the signal Y _W and the correction circuit 56. The blue signal B _W is supplied to the subtractor 62 to obtain a blue difference signal B _W -Y _W , which is supplied to the balance modulator 63 to obtain a balanced modulated signal by the blue difference signal. At the same time, the signal Y _W from the adder 61 and the red signal R _W from the correction circuit 56 are supplied to the subtractor 64 to obtain a red difference signal R _W -Y _W , which is balanced by the balance modulator 65. Is supplied in phase with the equilibrium modulated signal

A balanced modulated signal is obtained due to a shifted red difference signal. Then, the angular balance modulated signals of the blue and red difference signals from the modulators 63 and 65 are supplied to the adder 66, and added to each other to obtain a right angle two-phase balanced demodulated signal of the red and blue difference signals. The adder 66 is supplied with the luminance signal Y _W from the adder 61, and the vertical and horizontal synchronization signals and the burst signal are supplied from the signal generator 67, and thus from the adder 66. The color image signal by the NTSC system is obtained, and taken out from the output terminal 68.

In the case where the correction circuit 56 is not provided, the encoder 60 is configured as in the fourteenth degree. In this case, the three primary color signals R _C , B _C , G _C from the detection circuits 41, 42, 43 are supplied to the adder 61 to obtain the luminance signal Y _C , and the adder 62 is added. (64) obtains the blue and red difference signals B _C -Y _C and G _C -Y _C from the signals Y _C and B _C and R _C and simultaneously adds the wideband luminance signal Y _W from the subtractor 51. 66) to obtain an NTSC color image signal at the terminal 68.

In this case, the color image signal is obtained, but in this case, according to the present invention, since the area of the filter 14 that transmits white light is larger than that of the portion that transmits specific color light, the synthesized signal from the image pickup tube 12 as described above. E _i luminance signals Y _i are color signal C _i not the number of the level of the larger than the peak level and the luminance signal Y _i is changed by the brightness level of in, thus obtained is of high quality without a color image signal is unbalanced due to luminance do.

In particular, such a configuration is simple and inexpensive since only the change of the width of the stripe of the filter 14 is sufficient.

Further, in this case, the narrower the width of the stripe through which the color light of the filter 14 is transmitted, the higher the level of the luminance signal Y _i . Therefore, it is preferable to make the width of the stripe larger than half of the pitch.

Next, another example of the present invention will be described with reference to FIGS. 15 and 16. FIG.

The 15 degree example, the stripe S _B and S _G stripe S _B of the stripes S _E for transmitting impregnated color light being formed to extend in a direction perpendicular to a direction that corresponds to the scanning direction of the beam, passes through the enemy, and the green light It is formed by extending in a direction inclined by angles θ ₁₄ and θ ₁₅ in directions opposite to each other in the direction of extension, and furthermore, the pitches in one direction corresponding to the scanning direction of the beams of stripes S _B , S _R , S _G are This is a case where the widths of the stripes S _B , S _R , and S _G are each two-thirds of the pitch as indicated by P, P _R , and P _G.

in this case

Therefore, when pitch P and distance d are selected as described above, θ ₁₄ is about 26.9 ° and θ ₁₅ is about 35.4 °, respectively.

In the example of FIG. 16, the stripe S _{R through} which the direct light is transmitted is formed extending in a direction perpendicular to one direction corresponding to the scanning direction of the beam, and the stripe S _{B through} the blue light is inclined by θ ₁₀ with respect to the stripe S _R. , stripes S _G which passes through the green light is striped leaning in the same direction as the large θ ₁₁ than θ ₁₀ for S _R, in addition, each the pitch in one direction corresponding to the scanning direction of the beam of the stripe S _R, S _B, S _G P , P _B , P _G slightly different from the example of FIG. 15, and the widths of the stripes S _R , S _B , and S _G become 2/3 of the pitch, respectively, as in the example of FIG. 15. .

in this case

Therefore, when the pitch P and the distance d are selected as described above, θ ₁₀ is about 32.8 ° and θ ₁₁ is about 54.9 °.

In addition, in the case of FIG. 16, it is conceivable to reverse the inclination directions of the stripes S _B and S _G , but it is better to incline as shown in the figure with respect to one direction corresponding to the scanning direction of the beam in terms of resolution. In other words, since the electron beam sequentially scans the photoelectric conversion plane, the effective spot size of the beam is super crescent, surrounded by a thick line in FIG. However, since the diameter of the beam is larger than the interval between the scanning lines, it is pre-charged at the part overlapping with the spot in the horizontal scanning section before displaying it by the dotted line circle. Only one part. Thus striped S _B, according becomes S _G is tilted, as claim 16 help, this stripe side different from the tilted to the scanning direction of the beam, as indicated by S _i according to claim 17, also by the stripe S _B, S _G is the sixteenth help Is inclined in the opposite direction, so that the resolution is better than when the stripe image is inclined as indicated by S ₂ in FIG.

Also in these filters of FIG. 15 and FIG. 16, when subjects are color-separated and these color-resolution images are projected on the photoelectric conversion surface of the imaging tube, and scanned with an electron beam, the electron beam of each stripe S _R , S _B , S _G is obtained. according to a direction corresponding to the scanning direction since the pitch is slightly different from each other red, blue and rust for each color signal component is obtained and, moreover, each stripe S _R, S _B, as a carrier screen signal to a different carrier frequency, each adjacent to each other Since the directions of the slopes of S _G are different from each other, the phase differences in adjacent horizontal scanning sections are as different in each color signal component.

For example, when the distance d of the pitch p is selected as described above, in the example of FIG. 16, the carrier frequencies f _R , f _B and f _G of the respective color signal components of red, blue, and green are 3.58 MHz, 3.0 MHz, and 3.3 MHz, respectively. In the example of FIG. 15, the values are 4.2 MHz, 3.58 MHz, and 3.0 MHz, respectively.

That is, the synthesized signal E _i obtained from the image pickup tube at any i-th horizontal scanning section is

_R,

_B,

_G는 스트라이프 S_R, S_B, S_G의 기울기로 결정되는 위상각으로 제 16 도의 경우는 m=3, n=2,

_R=0,

이고, 제 15 도의 경우는 m=3, n=2,

,

_B=0,

이다. 또한 신호 E_i의 주파수 스펙트럼의 일예를 제 18 도에 표시했다.Is displayed. From here

_R ,

_B ,

_G is a phase angle determined by the slopes of the stripes S _R , S _B , and S _{G. In} FIG. 16, m = 3, n = 2,

_R = 0,

In the case of FIG. 15, m = 3, n = 2,

,

_B = 0,

to be. An example of the frequency spectrum of the signal E _i is shown in FIG. 18.

중에 포함되는 누화성분을 제거함과 동시에, 가산기(39)와 검파회로(43)과의 사이에 트랩회로(46)을 설치하여 녹색신호성분 G_i중에 포함된 누화성분을 제거하도록 한 경우이다.For example, in the case of FIG. 15, the phase relationship of the color signal components R _i , B _i , and G _i in each horizontal section is the same as in the case of the filter of FIG. 5. Therefore, as shown in FIG. Color video signal can be obtained from inquiry. In this demodulation circuit, however, a trap circuit 45 is provided between the adder 37 and the detection circuit 41 to provide a red signal component.

It is a case where the crosstalk component contained in the green signal component G _i is removed by providing the trap circuit 46 between the adder 39 and the detection circuit 43 at the same time.

Also in the case of the filter of FIG. 16, a color video signal can be obtained.

Furthermore, in addition to the above-described example, the present invention also doubles one stripe having a pitch in one direction corresponding to the scanning direction of two stripe electron beams, so that the carrier frequency is the same in two color signal components, so that the remaining one It is widely applied even when the carrier frequency of the color signal component is doubled.

In addition, in the above-mentioned case, although it is a case where a television camera is comprised, when the color separation image obtained is image | photographed with the photographic film for black-and-white, and the imaging film 12 is imaged after processing required for image fixing, printing, etc., the imaging tube A color separation image is projected on (12), so that a color image signal can be obtained.

The synthesized signal E _i can be recorded in a film or the like by an electron beam recording method, and the recorded film or the print film can be reproduced by a dedicated player. Alternatively, the hologram can be used as a so-called selector vision.

Claims (1)

As described above and shown in the drawings, the color separation filter for color imaging, wherein the area of the portion transmitting all color light obliquely intersects at least two filter stripes whose area is larger than the area of the portion transmitting any one color light. .

Images