JP2885832B2 - Image processing method - Google Patents

Description

The present invention relates to an image processing method, for example, to an image processing method such as a paint process.

[Prior Art] Conventionally, in this type of apparatus, there is a two-dimensional paint system as an example of applying image processing technology to the design field. This is a system in which data can be written to an image memory as if drawing with a pen or paint while observing an image on a CRT monitor using a coordinate input device such as a digitizer.

In the system described above, several representative color palettes that serve as paints drawn with a brush are prepared.
The operator selects an arbitrary color (image processing color) from the color palette and performs drawing.

[Problems to be Solved by the Invention] However, according to the method using the above-described representative color palette, it is desired to select a different color of lightness or saturation, or both, without changing the hue. If you want to select different colors for saturation and / or hue without changing the color, you have to create the image you want by mixing the colors of the pallets yourself. This work requires advanced technology,
Only a skilled person could do it, and it was not a very practical method.

The present invention has been made in view of the above-described conventional disadvantages, and has as its object to enable a user to easily select a desired color used for image processing.

In particular, by providing a plurality of two-dimensional display methods based on color components such as hue, lightness, and saturation according to human color sense, and by allowing the user to select a display method according to the application, It is an object of the present invention to enable a user to easily find and select a desired color used for image processing.

[Means for Solving the Problems] In order to solve the above problems and achieve the object, an image processing method according to the present invention provides a first display for displaying a plurality of colors two-dimensionally based on hue and brightness. A second display method for displaying a plurality of colors two-dimensionally based on brightness and saturation;
3rd display of multiple colors two-dimensionally based on saturation and hue
Inputting a user instruction indicating an arbitrary display method among the first to third display methods, and displaying a plurality of colors two-dimensionally by a display method according to the instruction. Then, a user's instruction regarding selection of an arbitrary color from among the plurality of colors displayed two-dimensionally is input, and image processing is performed based on the color selected in accordance with the instruction.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

<Description of the Configuration of the Apparatus> FIG. 1 is a block diagram showing the configuration of an image processing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes the entire apparatus.
A CPU controlling based on various programs in the ROM 2 is shown, 2 is a ROM storing a control program, an error processing program, a flow chart program shown in FIG. RA used as work area and temporary save area for error processing
M is shown. Reference numeral 4 denotes an HLS volume display control unit, which is provided on a display unit 10 to be described later with a full range for each of three attributes of a color consisting of H (hue), L (lightness), and S (saturation). Is controlled to visually display.
Reference numeral 5 denotes a pallet operation unit, which is used to create color information, that is, a color pallet, based on a combination of two other attributes except an attribute selected by a digitizer 8 described later on a display unit 10 described later. Perform the operation. Reference numeral 6 denotes a pallet display control unit, which controls a color pallet created by the pallet operation unit 5 to be displayed as an image processing color on a display unit 10 described later. Numeral 8 denotes a digitizer functioning as a selecting device, which is a tablet in this embodiment. The display unit 10 described later is also used by using the digitizer 8.
Then, a color attribute displayed by each display control unit or a color in a color palette is selected.

Reference numeral 7 denotes a keyboard having keys for performing various operations, which is used for switching to a mode such as a painting operation of the present embodiment. Reference numeral 9 denotes an HLS / RGB conversion unit, which converts the HLS values transferred from the HLS volume display control unit 4 and the pallet display control unit 6 into a display unit 1 described later.
RGB values (R: red, G: green, B
... blue). Reference numeral 10 denotes a display unit, which is a CRT display in the embodiment. Numeral 11 denotes a paint control unit, which controls a painting operation performed on the pallet selected by the digitizer 8.

<Description of Display Control of Present Apparatus> Next, each display control of the present apparatus will be described.

2 (a), (b), and (c) are diagrams showing display examples of H, L, and S volumes by the HLS volume display control unit 4, and FIG. 3 is an HLS coordinate system of the present embodiment. FIG. The HLS volume display control unit 4 causes the display unit 10 to display the volumes shown in FIGS. 2 (a), 2 (b) and 2 (c). Note that all colors are the same as those of the hexagonal pyramid shown in FIG.
Included in the HLS coordinate system.

First, an H volume shown in FIG. 2 (a) is a volume for selecting a hue, which is at a position of L (brightness) = 0.5 in the HLS coordinate system shown in FIG. The colors of the perimeter of the cross section cut vertically are displayed side by side in a donut shape (or may be displayed side by side in a hexagonal shape). On this donut-shaped H volume, colors are arranged in the order of R (red), Y (yellow), G (green), C (cyan), B (blue), M (magenta), and R (red). Is displayed with. Therefore, hue can be represented by an angle with respect to red. In other words, assuming that the lightness (L) is 0.5, all hues having the maximum saturation (S) are displayed on the donut. The L volume is a brightness volume, which is a gray scale within a range that can be displayed on the display unit 10, where 0 corresponds to black and 1 corresponds to white, which corresponds to all achromatic colors on the L axis in FIG. Means The S volume is a saturation volume, which has the same brightness and the same hue, and whose saturation changes from 0 to the maximum. In the present embodiment, a change in saturation when L (lightness) is 0.5 and H (hue) is 0 degrees (red) is displayed.
That is, 0 becomes gray and becomes reddish as it approaches 1, and 1 becomes completely red. Each of these hue, lightness, and saturation values is handled as an HLS value inside the apparatus, and the operator uses the digitizer 8 to select one of these three types of volumes.
Select a seed and specify any value in it. For example, when using a digitizer 8 on H Boriyumu to move the cursor, the lightness as the portion part of the brightness on the donut as shown in FIG. 2 (a) is indicated by the arrow H ₁ in FIG. Changes. Further, by rotating the Dejitaizupen not shown in that state on a circle, the part indicated by the arrow H ₁ is rotated and moved on concentric circles, switch is pressed at the position of the hue desired, its position It is selected as the value of hue (H).
Similarly, in the case of the L volume and the S volume, when the cursor is moved on each volume, as shown by arrows L ₁ and S _{1 in} FIGS. 2 (b) and 2 (c). In this case, a discontinuity in the brightness appears only in one place. When raising and lowering the digitizer 8 in each state, and upper and lower portion indicated by the arrow L _1, S _1, when the switch of the digitizer 8 is pressed at any position, with arrows L _1, S ₁ at that time The value of the indicated portion is the L value or the S value. By the operation of the operator up to this point, H, L,
The selection of each volume in S is completed. With the above operation, H
When one of the volume, the L volume, and the S volume is selected, there are three types of color palette creation methods corresponding to each of the volumes. Hereinafter, a method of creating a color pallet will be described in three cases.

First, when the H volume is selected, H (hue) is fixed, so that there are two parameters, L (brightness) and S (saturation). Thus, the palette calculator 5 calculates a combination of L (lightness) and S (saturation) with respect to the fixed H (hue). For example, when a hue corresponding to “red” is designated as H, the combination of L and S for reproducing such “red” is controlled by itself. For example, if a very close color is specified as L, the reproduced color will be close to black, and the hue "red" will not be reproduced. Accordingly, here, a reproducible combination of L and S for the set H is calculated. The calculated results are sent to the pallet display control unit 6, arranged in a form having good operability to select them as pallets, and displayed on the display unit 10 via the HLS / RGB conversion unit 9.

FIG. 4 is a diagram showing an example of the LS palette of this embodiment.

This is the case where 0 (zero) deg of H is designated, and at this position, the bullet of R (red) hue is designated. This corresponds to the right half of the cut face obtained by cutting the solid in a plane including the L axis and the R in FIG. On the L axis, the portion where L is the largest is white (W: white), the smallest portion is black (BLACK: black), and the larger the S (saturation), the brighter the red (R). The operator moves the cursor on the palette using the digitizer 8 and presses the switch of the digitizer 8 on the desired color, and the selected color becomes the color for the paint work.

When L volume is selected, L (brightness) is fixed, and the parameters are S (saturation) and H
(Hue). The palette calculator 5 calculates a combination of S (chroma) and H (hue) with respect to the fixed L (brightness). In the subsequent processing, the SH palette is displayed on the display unit 10 as in the case where the H volume is selected.

FIG. 5 is a diagram showing an example of the SH palette of the present embodiment. This corresponds to a three-dimensional cut surface cut on a plane perpendicular to the L axis of the HLS coordinate system shown in FIG. L (brightness) is constant and different colors of S (saturation) and H (hue) are arranged. Thereafter, the operator can select any color from the H volume as in the case where H volume is selected.

When S volume is selected, S (saturation) is fixed, so that the parameters are H (hue) and L
(Brightness). The palette calculator 5 calculates a combination of H (hue) and L (brightness) with respect to the fixed S (saturation). Thereafter, the HL palette is displayed on the display unit 10 in the same manner as when the H volume is selected.

FIG. 6 is a diagram showing an example of the HL palette of this embodiment. This corresponds to an expanded view of the side surface when a solid is cut out with a cylinder having a constant S (saturation) in FIG. Then, similarly to the processing in the case of H volume, the operator can select an arbitrary color from among them.

As described above, the selection of the color is performed, and when the color for the paint work is determined, the paint control unit 11 performs the paint work according to the instruction of the operator.

A processing procedure that summarizes the above operations will be briefly described.

FIG. 7 is a flowchart for explaining the palette color selection processing of this embodiment.

First, when there is an instruction to start the painting operation from the keyboard 7, the HLS volume is displayed on the display unit 10 (step S1). The operator selects a color attribute to be fixed by using the digitizer 8. For example, if the position of the cursor on the display screen is on the H volume (step S2), the brightness at the position specified by the digitizer 8 is changed so that it can be distinguished from other parts on the H volume (step S4). Similarly, if the position of the cursor is the position of the L volume or the S volume (step S2), the brightness of the position specified by the digitizer 8 at each position is distinguished from other portions on the L or S volume. Can be changed as needed (step S5). If the position of the cursor is in another area, no processing is performed.

The position of each volume is designated in each of the steps S3, S4, and S5. At this time, when the switch of the digitizer 8 is turned on (step S6), the type of the volume is determined (step S7). Palette color selection processing is performed according to the type. First, when the H volume is selected, the value of H (hue) is fixed, and L, S corresponding to the value is fixed.
Are calculated (step S8). Then, the LS palette based on the above calculation is displayed on the display unit 10 (step S9). Subsequently, a desired color is selected from the LS palette by the operator, and the selected color is sent to the paint control unit 11 as a color for the painting work (step S10).
The subsequent steps are the same as those in a normal painting operation, and will not be described. Also, as a result of the determination of volume in step S7,
In the case of the L volume or the S volume, the SH palette is used in the case of the L volume, and the HL palette is used in the case of the S volume, and a desired color of the operator is selected from the respective palettes ( Step S1
1 to Step S16).

As described above, according to this embodiment, the operator can view the colors of the same hue, the colors of the same lightness, and the colors of the same saturation as one pallet at a time and select them by comparing them. Of course, the colors are not RGB values according to the structure of the computer, but hue (H), lightness (L),
It can be handled and specified in a form close to human color sense called saturation (S).

In the above-described embodiment, the palette is created using the HLS coordinate system. However, the present invention is not limited to this. For example, the HSV hexagonal pyramid color model and the HSI triangular pyramid may be used as other color coordinate systems. Color model).

Further, in the above-described embodiment, the palette for selecting the color for the paint work is created. However, the present invention is not limited to the paint work and may be used for other image processing (for example, during the processing). , Etc. to specify a color).

Further, in the above-described embodiment, an arbitrary color is selected from the pallet and used as it is for subsequent processing. However, the present invention is not limited to this.
(Lightness) and S (saturation) may be finely adjusted. In this way, by specifying a color desired by the operator in a state close to human color sensation, more detailed operation can be performed. Allows specification.

In the above-described embodiment, R (red) is used for the hue of the S volume (saturation volume), but the hue can be variously changed depending on the application.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an image processing method in which a user can easily select a desired color used for image processing.

In particular, by providing a plurality of two-dimensional display methods based on color components such as hue, lightness, and saturation according to human color sense, and by allowing the user to select a display method according to the application, An image processing method that allows a user to easily search for and select a desired color to be used for image processing can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an image processing apparatus according to an embodiment of the present invention, and FIGS. 2 (a), (b) and (c) show H, L, and S by the HLS volume display control unit 4. FIG. 3 is a diagram showing a display example of a volume, FIG. 3 is a diagram showing an HLS coordinate system of this embodiment, FIG. 4 is a diagram showing an example of an LS palette of this embodiment, and FIG. FIG. 6 is a diagram showing an example, FIG. 6 is a diagram showing an example of an HL pallet of this embodiment, and FIG. 7 is a flowchart for explaining a pallet color selection process of this embodiment. In the figure, 1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... HLS volume display control section, 5 ... Pallet operation section, 6 ... Pallet display control section, 7 ... Keyboard, 8 ... Digitizer, 9... HLS / RGB conversion unit, 10... Display unit, 11... Paint control unit.

Continuation of front page (56) References JP-A-62-200465 (JP, A) JP-A-62-92900 (JP, A) JP-A-63-106762 (JP, A) JP-A-63-237177 (JP, A) , A) Masahiko Kunitomo, "Three Softs that Enable Various Expressions", Monthly ASCII, ASCII Corporation, April 1, 1989, Vol. 13, No. 4, p. 301-308 (Refer to page 3 on page 305) HyPER FRAME & Ayako ", ASCII, Monthly, ASCII Corporation June 1, 1988, Vol. 12, No. 6, P. 239-244 (P. 241 screen 4 See “Full Color Paint Software Super Draw”, Monthly ASCII, ASCII Corporation, April 1, 1988, Vol. 12, No. 4, P. 208-211 (P. 209 Screen 2, Screen 3, Screen 4, (58) Field surveyed (Int.Cl. ⁶ , DB name) G06T 11/80

Claims (2)

(57) [Claims] 1. A first display method for displaying a plurality of colors two-dimensionally based on hue and brightness, and a second display method for displaying a plurality of colors two-dimensionally based on brightness and saturation.
And a third method of displaying a plurality of colors two-dimensionally based on saturation and hue.
Inputting a user's instruction indicating an arbitrary display method among the first to third display methods, and displaying a plurality of colors two-dimensionally by a display method according to the instruction. And inputting a user's instruction regarding selection of an arbitrary color from the two-dimensionally displayed plurality of colors, and performing image processing based on the color selected in accordance with the instruction. Processing method. 2. The method according to claim 1, further comprising: inputting a user's instruction regarding a value of a color component other than two color components defining two dimensions in the two-dimensional display, and displaying a plurality of two-dimensionally displayed according to the instruction 2. The image processing method according to claim 1, wherein the color is changed.