JPS59163995A - Hue adjusting device - Google Patents

Abstract

PURPOSE:To simplify the hue adjustment without changing a color saturation level by forming a color signal in which the hue of each chrominance signal is shifted by a prescribed value respectively. CONSTITUTION:The chrominance signals R, G, B are converted once into two kinds of functions B-Y and R-Y as variables and then multiplier means 4-7 where trigonometric functions cosphi and sinphi taking a prescribed variable phi as a phase are multiplied with the functions B-Y and R-Y are provided. The output of the multiplier means 4-7 is mixed at mixer circuits 8, 9 and then mixed at a matrix circuit 10 so as to form signal again.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a hue adjustment device suitable for video equipment such as a video printer using an R (red), G (green), or B (blue) input method, for example.

(Prior Art) Conventionally, in printing devices that input color video signals and reproduce images on paper, etc., direct input signals such as R, G, and B inputs that are not converted to standard television signals are used. Color signals are often used as input signals.

In such so-called direct input color video equipment, when adjusting the hue, the only method that has been considered is to adjust the hue by adjusting the levels of the RoG and H input signals, respectively.

However, in this method of adjusting each color signal individually, the color saturation changes each time, and it is very difficult to smoothly obtain a desired hue.

(Objective) It is an object of the present invention to provide a hue adjustment device that can eliminate the drawbacks of the prior art.

In particular, it is an object of the present invention to provide a hue adjustment device that allows easy hue adjustment.

(Example) The present invention will be described in detail below based on Examples.

FIG. 1 is a schematic diagram of a first embodiment of the present invention.

Reference numeral 1 denotes a matrix circuit as a function forming means of the present invention, which forms three functions, for example, using each input of R, G, and B (i) as a parameter (variable).

Here, (RY) is assumed to be a first function, and (BY) is assumed to be a second function.

Reference numeral 11 represents a hue setting operation member according to the present invention, which outputs a predetermined value φ.

2.3 are the trigonometric functions cosφ, s with these values as φ variables, respectively.
This is a trigonometric function circuit that outputs inφ, respectively.

4 to 7 are multiplication circuits as multiplication means according to the present invention, and the multiplication circuits 4.5 and 4.5 are respectively co.
The circuit for multiplying sφ and sinφ, the multiplication circuit 6.7, is (R-
Y) This is a circuit that multiplies the signal by e08φ and sinφ, respectively.

8.9 is a mixer circuit as a mixing means according to the present invention, where circuit 8 adds the output of circuit 4 and output of circuit 6, and circuit 9 adds the inverted output of circuit 5 and the output of circuit 7. do.

Therefore, the output (B-Y) (φ) of circuit 8 is (13-Y) (
φ)−=(B−Y) cosφ+(RY)sin
φ...■, the output (RY) (φ) of circuit 9 is (R
−Y ) (φ)= −(B −Y ) sinφ
+(RY)cosφ...■.

Therefore, if as shown in the second diagram < (RY) axis, (B-Y)
Color Z (Cc
osγ, Cs1nγ), so ■, 0
It can be expressed using the formula.

That is, Z(C cos
The color Z'(Ccos(r-
φ), Cs1n(r−φ)).

This does not change p-chroma (color saturation) at all,
It is possible to obtain an effect substantially equivalent to shifting the hue clockwise by φ.

In the present invention, after performing such conversion, the Y signal and (B
-Y)(φ), (RY)(φ) signal to R(φ), G
(φ) and B(φ), it is possible to finally obtain a color signal in which the hue of each color signal is shifted by φ.

Next, FIG. 3 is a diagram showing an example of the configuration of the trigonometric function circuit according to the present invention, in which the value φ output from the operating member 11 is converted into a digital signal by the k converter 16. This digital signal is ROM (read only memory) 12
．． It is input as a 13 address signal.

Data is stored in each of the ROMs 12 and 13 so as to generate a function by table lookup at an address corresponding to this address signal.

That is, the cas function is stored in the ROM '12, and the RO
A sine function is stored in M13.

Therefore, the ROM 12.13 outputs digital signals of cosφ and sinφ corresponding to the operating member 11,
Analog amount Φe08φ with D/A converter 14 and 15 respectively,
It is converted to sinφ.

In this way, in the present invention, each color signal (for example, ff, R6G,
Instead of adjusting the hue by changing the levels of B), multiplication is performed in which each color signal is converted into two types of functions as variables, and then each function is multiplied by a trigonometric function whose phase is a predetermined variable. Since the multiplication means is configured to mix the outputs of the multiplication means and then form the color signal again, the hue can be easily adjusted with a single operating member, and the desired hue can be obtained extremely easily. can. In addition, since only the hue can be adjusted independently without changing the color saturation level when adjusting the hue, it is also easier to operate than conventional ones.

In addition, in this embodiment, as the first and second functions (RY),
(B-Y), it is also possible to use a general-purpose IC for television signal processing.

In the above embodiment, R, G, and B inputs were considered, but for example, Ye (yellow), Ma (macenta LCy (cyan),
Needless to say, the present invention can be applied to all color video equipment such as a monitor television, which may be a K (black) input, and which inputs a plurality of color signals independently.

In addition, in the example, the first and second functions are (RY), (
B-Y) was considered, but it may be combined with other examples such as (G-Y).

Alternatively, one of the (2) signal and the Q signal in the standard television signal may be used as the first function, and the other may be used as the second function.

(Effects) As explained above, according to the present invention, hue adjustment can be performed without affecting color saturation in color video equipment that uses direct input signals such as R, G, and B. =i-no.

Further, the hue can be easily adjusted by operating only one operating section. Moreover, it has many effects such as the ability to simplify the circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of the hue adjustment device of the present invention, and FIG.
The figure is a diagram for explaining the effect of the configuration shown in the first diagram, and FIG. 3 is a diagram for explaining an example of the configuration of the trigonometric function circuit. 1.10...Matrix circuit, 11...Operation member, 2.3 Trigonometric function circuit, 4-7...Multiplication circuit, 8.9...Mixer circuit. Patent applicant: Canon Co., Ltd. = 54

Claims (1)

[Scope of Claims] Function forming means for inputting a plurality of independent color signals and forming mutually different first and second functions using the plurality of color signals as variables; and a mixing means for mixing the outputs of the means. and color signal forming means for forming a plurality of independent color signals from the output of the mixing means.