JPH03127284A - Color picture processing device - Google Patents

Abstract

PURPOSE:To perform color conversion without damaging the qualitative feeling by changing the hue and the saturation while keeping the brightness with respect to the color of a designated position area. CONSTITUTION:Color picture data of R, G, and B outputted from a color resolving means such as a color scanner which resolve an inputted color picture to respective color components are converted to color picture data of the hue, the saturation, and the brightness. The hue and the saturation are converted by a color converting means 4 while keeping the brightness as designated by a color designating means 3 with respect to the color of the position area designated by a position designating means 2 and are converted to color picture data of R, G, and B. Thus, color conversion is performed without damaging the qualitative feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color image processing device that processes color image data and changes a predetermined color to a different color without impairing texture.

[Prior Art] Conventionally, in a digital color image read by a color scanner or the like, color conversion processing to change a predetermined color of the image may be required.

Conventionally, when color conversion is performed in response to this request, the color after conversion is kept constant within a designated area such as a character.

[The invention attempts to solve the problem.] i! ff1lHowever, although such a device is good for images that do not take into account shading, such as characters, for example, there is a problem in that the texture is lost when it comes to images that have complicated shading changes, such as natural images.

The present invention has been made to solve the above-mentioned problems, and provides a color image processing device that can perform color conversion by changing hue and saturation while maintaining brightness and without impairing texture. It's about doing.

[Means for Solving the Problems] In order to achieve this object, the color image processing device of the present invention includes a color separation means that separates an input color image into each color component, and a color separation means that separates the input color image into each color component, and separates each color component data into hue and chroma, respectively. data converting means for converting into brightness and brightness data; position specifying means for specifying a positional area of the color image to which color conversion is desired;
It is comprised of a color specifying means for specifying a color after conversion, and a color converting means for changing the hue and saturation of the color in the position area specified by the position specifying means while maintaining the brightness.

[Operation] The present invention having the above-mentioned configuration is capable of dividing color image data of, for example, R, G, and B output from a color separation means such as a color scanner that divides an input color image into each color component into hue and saturation. , and brightness, and converts the hue and saturation of the color in the position area specified by the position specifying means while maintaining the brightness as specified by the color specifying means. , this is R,G
.

Color conversion is performed by converting to B color image data.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic block diagram of a color image processing apparatus according to an embodiment of the present invention. Reference numeral 1 denotes a data conversion means, for example, a color image that separates an inputted color image from a color scanner (as shown) into each color component. The decomposition means converts the color image into R,
A color image that is separated into three primary colors, G and n, and captured as 8-bit gradation data for each color, is converted from R, G, and n data into hue, saturation, and brightness data, and this inverse conversion is performed. It is something.

2 is a position specifying means which displays a color image on a color display (when shown) and selects the W of the color to be converted in the color image.
The F5 value of a certain point in the area i is input using a cursor or keyboard. 3 is a color specifying means for specifying a color after conversion.

Reference numeral 4 denotes a color conversion means that performs color conversion.

FIG. 2 shows a configuration diagram of a system using the color image processing device, which inputs a color image, specifies an area, performs color conversion according to the present invention only on the specified area, and outputs it to a display device. This is what I am trying to do. In FIG. 2, 5 is a color image input device that takes in a color image, 6 is an area designation device that specifies an area for color conversion, and 7
Reference numeral 8 indicates a color image processing device of the present invention, 8 a control device for performing $IJtil of the entire system, 9 a storage device for storing various data, and 10 an output device for displaying a color image.

Next, the operation of the system using the color image processing apparatus configured as described above will be explained based on FIG.

First, in step 1, color image data is input using a color image data input device 25 such as a color scanner or a camera.

Next, in step 2, an area is specified using the area specifying device 6. This can be done, for example, by displaying a color image on the output device 10 and surrounding the desired area of the color image with a mouse. Specify the clothes (shaded areas) of the person in the image shown in Figure 4, and create a mask as shown in Figure 5. Alternatively, a pre-stored mask as shown in FIG. 5 may be retrieved from the storage device 9.

Thereafter, in step 3, the color image data within the area specified in step 2 is converted into hue,
Convert to saturation and brightness data. These hue, saturation, and brightness are the three attributes of color that suit human vision, and there are H3I triangular pyramid models, HS V hexagonal pyramid models, and HSL Sugoroku bell models, all of which are based on the 6th color. It can be considered in a cylindrical coordinate system as shown in the figure. Here, θ is hue, S is saturation, and ■ is brightness.

Next, in step 4, the color to be converted is specified. This displays a color image on the output device 10, specifies an appropriate position in the area using the position specifying means 2, and sets the color at this position as the representative color before conversion.

Also, in step 5, the color after conversion is specified. This is done by inputting R, G, and B values from the keyboard using the color specifying means 3, and these are used as converted colors.

The xy coordinate system of the cylindrical coordinate system shown in Fig. 6, which performs color conversion in step 6.
'The F side is shown in FIG. 7, the representative color designated in step 4 is A, and the converted color designated in step 5 is B. Here, the representative color A is moved to the converted color B.

This can be done by using a conversion formula to rotate the fIA value of the representative color A in the hue θ direction 1hJ while maintaining the brightness V, and expand it in the saturation S direction. This operation is performed for all pixels within the area specified in step 2 to perform color conversion.

Next, in step 7, the data conversion means 1 inversely converts the converted data of all pixels into R, G, and B.

Finally, in step 8, the converted image is displayed on the output device 10.

The color image obtained in this way maintains its brightness even if the hue and saturation change, so the texture of the original image is not lost even if the color changes.

Note that this invention is not limited to the above embodiments, and can be modified and embodied as desired without departing from the gist of the claims. [Effects of the Invention] It is clear from the above detailed description. As described above, according to the present invention, there is an effect that color conversion can be performed without impairing the texture.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the color image processing device of the present invention, FIG. 2 is a block diagram of a system using the color image processing device of the present invention, FIG. 3 is a flowchart, and FIG.
The figure is a front view explaining the designated area of the image, Figure 5 is a front view showing the mask image, Figure 6 is a perspective view showing the color attributes of hue, saturation, and brightness, and Figure 7 is the same as Figure 6. FIG. 1... Data conversion means, 2... Position specifying means, 3.
...Color designation means, 4.Color conversion means, 5.Input device, 6.A area designation device, 7.Color image processing device, 8.Control device, 9.. Storage device, 10...
Output device.

Claims (1)

[Claims] 1. Color separation means for separating an input color image into each color component; data conversion means for converting each color component data into hue, saturation, and brightness data; a position specifying means for specifying a positional area to be color converted; a color specifying means for specifying a color after conversion; and a color for changing the hue and saturation of the color in the positional area specified by the position specifying means while maintaining brightness. A color image processing device comprising a conversion means.