JPH0830779A - Color tone adjusting device for color image - Google Patents

Abstract

PURPOSE:To obtain a device which is capable of adjusting the color tone of only a designated part and performing a color tone adjustment by noticing arbitrary hue by providing a means designating a partial area to be corrected and separating it from other area and a color tone adjustment processing means designating a hue direction and adjustment amount to be added to and subtracted from the partial area. CONSTITUTION:In an area designation part 102, a closed area where a color tone adjustment is performed in image data is designated by using an input device. In an adjustment area decision part 103, whether each picture element within a screen belongs to the adjustment area designated by the area designation part 102 or not is decided. In an adjustment amount designation part 104, the hue direction to be added or subtracted in the color tone adjustment is selected by a color tone ring and a color bar, etc. In a component intensity adjustment part 105, the color tone adjustment of the area decided as the adjustment area by the adjustment area decision part 103 is performed according to the hue and adjustment amount designated by the adjustment amount designation part 104. When the adjustment of the color tone is performed, it is performed by converting the hue and adjustment amount designated by the adjustment amount designation part 104 into the intensity of each component of red, green and blue (RGB).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image which can be used in a wide range of industrial fields related to image and video production and processing, display and printing in video communication, television broadcasting, computer graphics, electronic publishing and the like. The present invention relates to a color tone adjusting device.

[0002]

2. Description of the Related Art In a conventional color tone adjusting device, when the color tone is adjusted, the color tone of the entire screen changes. Also, it only adjusted the red, green, and blue components.

[0003]

Therefore, in the conventional case, there is a problem that it is not possible to partially adjust the color tone such as only the complexion or the shade density. In addition, adjustment of intermediate hues such as yellow and flesh color is not intuitive and difficult to adjust, which is a big problem.

The present invention aims to solve the above-mentioned problems of the prior art, and intuitively adjusts the tone by paying attention to the process of adjusting the tone of only a designated portion and an arbitrary hue. The purpose is to realize the processing.

[0005]

In order to solve the above problems, the present invention specifies a partial area to be corrected in an image,
The adjustment area specification process that separates the specified area from the other areas, and the hue direction and the adjustment amount that are adjusted are specified.
There are provided two processing means called a color tone adjustment processing for adjusting a component according to the adjustment amount in the designated hue direction.

[0006]

By the above means, the areas such as only the complexion and the shade density are separated without changing the color tones of other areas. Therefore, the partial color adjustment in the designated area and the yellow and It becomes possible to intuitively adjust an intermediate hue such as a skin color.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A block diagram of a color tone adjusting apparatus according to the present invention is shown in FIG. Reference numeral 101 is a signal input unit, 102 is a region designation unit, 103 is an adjustment region determination unit, 104 is an adjustment amount designation unit, 105 is a component intensity adjustment unit, 106 is a signal output unit,
Is represented.

The signal input unit 101 inputs an image signal from a video camera, an image scanner, an image storage device, an image transmission device or the like, and sends it to the adjustment area determination unit 103. The area designating unit 102 designates a closed area, such as a person's face or the body of an automobile, in which color tone adjustment is performed in image data, using an input device such as a digitizer or a mouse. When designating a region, first, a closed figure that is a region boundary is drawn, and then, of the regions divided by the closed figure, which region is to be subjected to color tone adjustment is designated.

FIG. 2 shows how the area boundary is designated and the adjustment area is designated on the screen. In FIG. 2, screen 201
The three ellipses 202, 203, and 204 inside the box indicate the specified area boundaries, and the black circles 205 indicate the points pointed to for specifying the area.

The adjustment area determination unit 103 determines whether the area is a designated area or another area. In the adjustment area determination unit 103, each pixel in the screen is assigned to the area designation unit 1
It is determined whether or not it belongs to the adjustment area designated by 02. The adjustment area determination unit 103 firstly determines the area designation unit 102.
With the point pointed to for area designation as the starting point, pixels in the proximity of 8 are inspected, and if each pixel is not the area boundary, that pixel is labeled as an adjustment area. After that, with respect to the outermost pixel (outer circumference) of the partial area labeled as the adjustment area, each pixel in the vicinity of 8 is used as the adjustment area except when it is already labeled or is the area boundary. Label. The adjustment area determination process ends with the end condition that the area is not expanded in all the pixels on the outer periphery.

FIG. 3 shows a state of the adjustment area determined by the adjustment area determination unit 103. In the figure, screen 301
The shaded area 302 in the area indicates the area determined as the adjustment area.

The adjustment amount designation unit 104 selects the hue direction to be adjusted in the color tone adjustment by using a hue circle or a color bar. After the hue is determined, the degree of addition or subtraction of the hue component is specified using the volume or slider.
Once the adjustment amount (ratio) is determined, the hue of each pixel is adjusted by adjusting only the hue component to be adjusted.

FIG. 4 shows how a color bar is used to select a hue direction to be adjusted and how a slider is used to specify an adjustment amount. Here, an example is shown in which the hue to be adjusted is yellow and the adjustment amount (ratio) is 0.5 times.

The component intensity adjusting unit 105 adjusts the color tone of the area determined as the adjusting area by the adjusting area determining unit 103 according to the hue and the adjusting amount specified by the adjusting amount specifying unit 104. When adjusting the color tone, the hue and the adjustment amount specified by the adjustment amount specifying unit 104 are set to red, green, and blue (RGB).
The color tone is adjusted by converting the intensity of each component.

FIG. 5 shows how the hue and adjustment amount designated by the adjustment amount designating unit 104 are converted into RGB component intensities.

[0016]

[Outside 1]

A unit vector with black as the origin in the hue direction designated by the adjustment amount designation unit 104

[0018]

[Equation 1]

It is assumed that Assuming that the adjustment amount specified by the adjustment amount specifying unit 104 is m = 0.5, the color vector of an arbitrary pixel to be adjusted

[0020]

[Equation 2]

Is converted according to the following equation.

[0022]

(Equation 3)

However, in order that the converted RGB values do not become negative,

[0024]

[Equation 4]

And

[0026]

(Equation 5)

And

[0028]

(Equation 6)

It is necessary to limit the adjustment amount m within the range. In order to realize this limitation, a negative component is accepted by not accepting the designation of m exceeding this range, or by allowing the hue to be adjusted to be different from the hue designated by the adjustment amount designation unit 104. Is replaced with 0 or the adjustment amount is specified to be different from the adjustment amount specified by the adjustment amount designating unit 104, and the adjustment amount is limited to a range satisfying the condition that the converted RGB value does not become negative. End up,
Etc. can be used.

In the signal output unit 106, the component intensity adjusting unit 1
The image whose color tone has been adjusted in 05 is output to a display, a printer, an image storage device, an image transmission device, or the like.

[0031]

As described above, according to the present invention, it is possible to intuitively adjust the color tone of only a designated portion by paying attention to an arbitrary hue.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a conceptual diagram showing how an area is designated.

FIG. 3 is a conceptual diagram showing how adjustment area determination is performed.

FIG. 4 is a conceptual diagram showing how an adjustment amount is designated.

FIG. 5 is a conceptual diagram showing a state of conversion into component intensity.

[Explanation of symbols]

 101 signal input unit 102 region designation unit 103 adjustment region determination unit 104 adjustment amount designation unit 105 component intensity adjustment unit 106 signal output unit 201 screen 202 closed figure that becomes a region boundary 203 closed figure that becomes a region boundary 204 closed figure that becomes a region boundary 205 Pointed point 302 Adjusted area determined

Front page continuation (72) Inventor Harumi Kawamura 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Masayuki Inoue 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Noboru Sonehara 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor, Kanji Uemura 1-6-18 Minamiazabu, Minato-ku, Tokyo N T-Learning Systems Co., Ltd. (72) Inventor Yoshiharu Takizawa 1-6-18 Minamiazabu, Minato-ku, Tokyo NTT L-Learning Systems Co., Ltd.

Claims (1)

[Claims] 1. An apparatus for adjusting a color tone of a color image, comprising: an area designating section for designating a partial area to be modified in the image; and an adjusting area determining section for determining whether the partial area is a designated area or another area. A color image characterized by comprising an adjustment amount designating unit for designating a hue direction to be adjusted and an adjustment amount, and a component intensity adjusting unit for converting the adjustment amount into a variation amount of each primary color and adjusting the component intensity of the primary color. Color adjustment device.