JPS62154862A - Method and apparatus for processing image - Google Patents

Abstract

PURPOSE:To extract respective color data effectively and independently and to output and superpose colors included in respective color areas to express an intermediate color too by setting up respective color areas independently at the time of color separation based upon a processed result. CONSTITUTION:The reflected light of a color original is made incident upon an optical means and decomposed to red and cyanine components and respective components are converted into electric signals by photoelectric converting elements such as CCDs. These photoelectrically converted signals are normalized by reference color output values and the red photoelectric conversion signal VR and the cyanine photoelectric conversion signal VC are converted into digital data consisting of 6 bits by an A/D converter. Then, arithmetic processing of the digital data is executed. At the time of color separation based upon the arithmetically processed result, respective color areas are independently set up.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an image processing method and apparatus for separating color images, and more specifically, it is possible to output and express intermediate colors in addition to primary colors by mixing primary colors. The present invention relates to an image processing method and apparatus.

(Prior Art) Various methods are conventionally known for reading a color document with a scanner (image input device) and color-separating the read color image.

(1) First method For example, as shown in FIG. 10, a color original 1 is alternately illuminated with red light source 2 and blue light source 3, and each optical information is converted to a photoelectric conversion device such as a CCD. 4 and converts it into an electrical signal. Values obtained by normalizing the two outputs of the photoelectric conversion means 4 with the blank output value are set as VR and Vc, respectively, and these two signals are subjected to arithmetic processing to obtain a color separation map.

Proceedings of the 1985 National Conference of the Institute of Electronics and Communication Engineers, No. 110
7 creates a color separation map as shown in FIG. 11, and suggests that it is possible to perform multiple types of color separation based on this color separation map. The horizontal axis in Figure 11 is the normalized output (%) of the photoelectric conversion means (sensor) 4 when the red light source is on, and the vertical axis is the normalized output (96) of the photoelectric conversion means (sensor) 4 when the blue light source is on. are shown respectively.

(2) Second method Two types of photodetectors with different spectral sensitivity characteristics are provided for one pixel on the original, and the outputs VA and VB of these photodetectors are subjected to arithmetic processing to separate colors. (Unexamined Japanese Patent Publication No. 57-4
Publication No. 4825). For example, the vertical luminance axis (VA +V
For a), when VA +VB ≧aI (7)
When white a 2 < VA + Vs < a l When chromatic color VA + Ve ≦ a 2 (1) It is judged as black, and the horizontal hue axis (log VA -1o0 Va )
When log VA -1log Vs ≧b t
Red b 2 < log VA 10gVa < b
When I Green 10111 VA -10(] Va ≦
b 2 (1) Determine that Toki l'i. However, a in the formula
l, a2. b, , b2 are constants. FIG. 12 shows the color separation map obtained in this manner.

(3) Third method Optical information is transferred to a dichroic mirror, prism or R.
This method uses G and B filters to separate into three colors, red, green, and blue (see Japanese Patent Laid-Open No. 50-62320@).

FIG. 13 is a diagram showing various methods of color separation.

In (a), the image 12 of the photographic lens 11 is separated into three colors using a plurality of relay lenses 13 to 16 and dichroic mirrors 17 and 17', and the images are separated into three colors in decoy image tubes 18 to 20, respectively.
The structure is such that the image is again focused on the top. <mouth)
In the example shown in , a plurality of prisms 21 to 24 having a special shape are arranged between the photographing lens 11 and each of the image pickup tubes 18 to 20, and the prisms 21 to 24 are arranged between the prisms 21 and 22 and the prisms 23 to 24 are arranged. Dichroic mirrors 17 and 17' are disposed between the two and 24, respectively, to separate the colors into three colors.

(C) shows three prisms with acute apex angles 24.25.26
are fitted to form a triangle ABC as shown in the figure, and a dichroic mirror 27. is placed on the boundary surface of each prism.
28 to perform three-color separation.

The example shown in (d) has a configuration in which the prism of the example shown in (c) is exactly turned over. Dichroic mirrors 29' and 30 are formed at the boundaries of each prism.

(Problems to be Solved by the Invention) In the conventional technology, a color original image is separated into multiple types of color signals using an optical system, the separated color signals are read by a photoelectric conversion means, and various types of color signals are added to the read image signals. The process of creating a color separation map by performing arithmetic processing has been developed. However, the technology for extracting each color data using the created color separation map is still in the development stage and has not been published in writing.

The present invention has been made in view of these points, and
The purpose is to realize an image processing method and apparatus that can effectively extract each color data based on the created color N1 map.

(Means for Solving the Problems) A first invention for solving the above problems is to separate document information into at least two colors for each wavelength range, perform photoelectric conversion processing on the separated color signals, and perform photoelectric conversion processing. The second invention is characterized in that each processed image signal is subjected to arithmetic processing, and each color gamut is independently set when separating colors based on the result of the arithmetic processing. optical means for obtaining optical signals of at least two types of colors for each wavelength range from document information;
photoelectric conversion means for converting each optical signal from the optical means into an electric signal, and color separation information creation means for processing each image signal output of the photoelectric conversion means and obtaining color separation information based on the result of the calculation processing. and density information storage means, each of which has a density data storage area that receives the output signal of the color separation information creation means as an address, and is set independently for each color gamut.

(Example) The present invention sets each color gamut independently when separating a color image.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a flowchart showing one embodiment of the method of the present invention. The following will explain along this flowchart.

Step 1 Scan the color original. In order to read a color original, it is necessary to illuminate the original with a light source. As a light source, for example, a second
A material having spectral characteristics as shown in Figure (a) is used. In the figure, the horizontal axis indicates wavelength (nm), and the vertical axis indicates relative intensity (%). A color original is irradiated with a light source having spectral characteristics as shown in FIG. 2(a). The reflected light from the color original is incident on an optical means as shown in FIG. 3, for example, and is separated into red (Red) and cyan (CVall). In the figure, light reflected from a color original is incident on a prism 31. The incident light is reflected in a cyan color by the dichroic mirror 33 formed at the boundary between the prisms 31 and 32.
It is emitted from. On the other hand, red colors pass through the dichroic mirror 33 and are emitted from the prism 32. In other words,
The dichroic mirror 33 used in the present invention separates incident light into two types of light whose colors are complementary to each other. Figure 2 (b)
is a diagram showing the characteristics of a dichroic mirror.

In the figure, the horizontal axis is wavelength (nm), and the vertical axis is transmittance (%).
It is. From the figure, it can be seen that red wavelengths with longer wavelengths are transmitted, and cyan wavelengths with shorter wavelengths are anti-OA=. Here, being in a complementary color relationship means that if the two colors are P and Q, respectively, then P
+Q = color P such that it becomes white.

Refers to the relationship of Q. Note that any optical means that can achieve the purpose of color separation may be used, such as a half mirror, a combination of a beam splitter and a filter, or an LFI image element capable of color separation. .

Step 2 The separated two colors, red and cyan, are each converted into electrical signals using photoelectric conversion elements such as CCDs.

FIG. 2(c) is a diagram showing the spectral sensitivity characteristics of the COD used in the present invention. In the figure, the horizontal axis is wavelength (nn), and the vertical axis is relative sensitivity (%). As is clear from the figure, this CqD has a peak near the wavelength of 600nIIl. These photoelectrically converted signals are normalized by the output value of the reference color (white). VR normalized red photoelectric conversion signal,
Let the cyan photoelectric conversion signal be Vc. These photoelectric conversion signals are then converted into 6-bit digital data by a linear A/D converter. This is to make it easier to perform arithmetic processing on a computer (or microcomputer).

Step 3 Digital image signal j3V* obtained in step 2.

Color separation is performed based on a color separation map specified by VC. To determine this coordinate axis, consider the following points.

■In order to be able to express halftones, information on the reflectance (reflection density) of the document, which corresponds to the TV's R degree signal, is taken in.

■Incorporate information on color differences (including hue and saturation) of red, cyan, etc.

From the above, it is preferable to use, for example, the following as the luminance signal information and color difference signal information.

Luminance signal information (5 bits) = VR + VcVR, VC (○
≦VR≦1.0. ○≦Vc≦1゜0) sum VR + VC (
0≦VR+VC≦2.0) corresponds to the black level (=O) and the white level (-2), and all colors exist in the range from 0 to 2.0.

Color difference signal information (5 bits) = VR/ (VR+VC) or Vc/(VR+VC>
In the case of an achromatic color, the proportion of the VR acid component and the Vc acid component contained in the whole (Vq + Vc) is approximately constant.

Therefore, VR/(VR+VC)'=0.5 Vc/(VR+VC) i-0,5. Also, V
If the level of R+VC is low, VR/(VR+VC
>, Vc/(V!L +Vc)f7) It becomes black regardless of the value. On the other hand, in the case of chromatic colors, VR/
The value of (VR+VC) and 4tVc/(V*+Vc) is one measure of the hue and saturation of the original. That is, (1) red color 0.5<VR/ (VR+VC)≦1.00≦Vc/
(VR+VC)<0.5 (2) Cyan color 0≦VR/ (VR+VC)<0.5 0.5<Vc/(V++ +Vc)≦1.0. From this, VR + as the coordinate axis
Vc 1! :Vpt/(VR+VC) or Vc/(
By using a coordinate system with two axes (VR+VC),
It becomes possible to clearly separate chromatic colors (red, cyan) and achromatic colors.

FIG. 4 is a diagram showing an example of a color separation map in which the color gamut is divided according to the color separation method described above. In the figure, the horizontal axis represents color difference signal information VC/(VR+VC), the left vertical axis represents luminance signal information VR+VC, and the right vertical axis represents achromatic color contrast f)J
If 1 degree is shown. Color difference signal information - There is an achromatic color in the vicinity of 5 (hatched area in the figure), areas smaller than 0.5 are redish, and areas larger than 0.5 are cyanish. or,
Since there is a correspondence relationship as shown in the figure between the anti-Is degree and the luminance signal information VR+VC, it can be directly linked to the output value.

In the example shown in the figure, the horizontal axis represents color difference signal information as Vc/(v
Although VR/(VR+Vc) is used, the effect is the same.

In an actual image processing apparatus, the operations up to this point are realized by creating and storing a negative separation map in a ROM table as shown in FIG. The operation of the image forming apparatus using this table will be explained. The original is first scanned by a slit exposure optical system used in ordinary copying machines, etc., and the obtained optical image is passed through the color separation means shown in Fig. 3, and the COD
The light is received by photoelectric conversion means such as, to obtain image signals VR and VC, and further to obtain VR+VC and Vc/(VR+VC) signals. Addressed by these values, density-corresponding values are output according to the table.

On the other hand, recording means for recording on a recording medium are, for example, blue, red,
If you have a recording unit that records in black, for example, in blue, corresponding to each of the above scans.

Red and black are driven frame by frame, and each color is overwritten. That is, the following operations are performed: original scanning - outputting density corresponding values from the table -> previous recording -> original scanning -> outputting m degree corresponding values from the table -> red recording -> original scanning -> outputting density corresponding values from the table -> black recording. For such a recording means, the output signal from the table is controlled by a gate means (see Fig. 6 B, B, R color described later) that makes valid only the output value specified in the cyan region when recording in white. Select circuit 46. buffers 43 to 45) are provided.

Here, we will discuss the problems when using the table shown in FIG. 4 without the improvements of the present invention.]71;

Since there is only one VR and VC for each pixel of the original, in this case, the colors output during three scans can only be expressed as achromatic colors (red, blue, black) for each pixel. . It is hard to express neutral colors. These problems are as follows: 1. The color gamut may be configured to overlap for both VR and VC. That is, the inventors of the present invention have come to the conclusion that it is sufficient to be able to record one pixel in two or more colors. To do this, the color gamut must be set to V scale + Vc, VC/ (VR
+Vc), and the memory means were also set independently. By doing this, as will be described later, it is possible to express (reproduce) one pixel of purple or brown.

FIG. 5 is a diagram showing an example of the ROM table of the present invention, which is an improved color separation map shown in FIG.
VC/VR+VC) 3 2x accessed with 5 bits
It has a capacity of 32. These ROM tables each store 4 bits of 1fi (ilJ degree data) corresponding to 11 degrees of quantization obtained from one degree of reflection of the original.

At the time of output, this density corresponding value is read out using a color select signal, and the read density corresponding value is binarized using a threshold value specified for each color gamut and output data is obtained. Note that the output data does not necessarily have to be binary data, but may be multivalued data. (A) is a black ROM table, (
B) is the Rt) M table for the cyan color gamut, and <C) is the ROM table for the red gamut.

By configuring the ROM table in this manner, it is convenient when performing multicolor printing with a copying machine or the like. for example,
First, scan the original once and go to B.

The black density corresponding value is read out from the ROM 10-PULL shown in (a) using the B and R signals, and the corresponding black toner is deposited on the photosensitive drum and transferred onto copy paper. Next again,
Scan the original and B, B.

The cyan density corresponding value is read out from the ROM table shown in (b) using the R signal, and the corresponding f# is placed on the photosensitive drum.
Apply colored toner and transfer to the same copy paper. Finally, the document is scanned for the third time, and the value corresponding to the degree of red is read out from the ROM table shown in (c) using the B, B, and R signals, and the corresponding red toner is deposited on the photosensitive drum, and the same copy is made. Transfer to paper. A multicolored color image can be obtained through such a transfer process.

As you can see from the tflOM table shown in the figure (a)
The black color ROM table shown in (B), the cyan color gamut ROM table shown in (B), and the red color gamut ROM table shown in (C) each have densities that overlap with the same address part of other color gamut ROM tables. Corresponding value storage areas A, B, C
,D. Here, for example, the operation when reading a document and recording it using an electrophotographic method will be described below regarding a certain purple portion on the document.

By the 1rRth scan, a certain pixel on the document is addressed to, for example, the 5th row and 20th column (hereinafter referred to as (5, 20)), and the black memory 83 outputs the m degree corresponding value O, so after the binarization process Exposure is performed based on the data, and no black toner adheres to the copy paper even after the black toner development and transfer steps. In the second scan, (5, 20>) is addressed in the same way, and the value 7 corresponding to m degree is output from the red memory 81, and after processing such as binarization, exposure is performed based on the result, and the red toner is developed. , the toner adheres to the copy paper after the transfer process.The third scan causes the toner to adhere to the copy paper (5).
.
The purple statue is reproduced. That is, these areas A, B, C,
Each unique concentration corresponding value is stored in D.
At the same address, the once corresponding value of area A in (b) and (c)
By reading out the corresponding density value of the corresponding area, purple (red + blue) can be created. Using a similar series of processing and thinking, at the same address, the a-degree corresponding value of the C area in (B) and (
By reading out the density corresponding value of the λ1 corresponding region in c), brown (red + black) can be produced. Other intermediate colors (mixtures of pure colors) can be expressed by arbitrarily forming tables so that areas having density values from each table overlap. For example, pure) color is red.

In the case of yellow and red instead of the helmet, if the desired area is set to 1, the orange color will also be expressed.

The output value can be recorded by optical fiber tube (OFT), liquid crystal, exposure on the photoreceptor surface by laser, inkjet, thermal transfer 9, recording on silver salt or non-silver salt material, output to CRT, etc. It may be something like this.

FIG. 6 is a block diagram showing an embodiment of the device of the present invention. In the figure, 41 is the first
COD, 42 is the second C that receives cyan optical information.
OD, 51 is a first amplifier that amplifies the photoelectric conversion output of the first CC041, and 52 is a second amplifier that amplifies the photoelectric conversion output of the second CCD 42. 1st and 2nd CC
D41.

42 constitutes the photoelectric conversion means 40, and the first and second amplification units 151 and 52 constitute the amplification section 50.

61 is a first A/D converter that converts the output of the first amplifier 51 into digital data; 62 is a second A/D converter that converts the output of the second amplifier 52; The second A/D converters 61 and 62 constitute an A/D conversion section 60. The number of bits of the A/D converters 61 and 62 is, for example, about 6 bits.

71 is the output of the first A/D converter 61 and the second A/D
an arithmetic processing circuit (color separation information creation circuit) 72 that receives the output of the converter 62 and performs various arithmetic processing to obtain color separation information;
73 is a first buffer memory that stores the luminance signal data V*+Vc of the arithmetic processing circuit 71;
A second buffer memory 81 stores the color difference signal data Vc l (VR+VC) of 1, and a third memory 81 outputs a value corresponding to the red color density using the outputs of the first and second memories 72 and 73 as addresses. , 82 is a fourth memory which outputs the cyan color density corresponding value using the outputs of the first and second memories 72.73 as addresses, and 83 also receives the outputs of the first and second memories 72.73. The address receiver is the fifth memory that outputs achromatic color (black, gray, white) density corresponding values. Arithmetic processing circuit 71 and first and second memories 7
2.73 constitutes the color separation information creation means 70, and the third to
The fifth memories 81 to 83 constitute density information storage means 80. As the arithmetic processing circuit 71, for example, a microcomputer is used.

In this way, in the case of the device of the present invention, i! One information storage means is provided independently for each color gamut.

These memories 81 to 83 contain R as shown in FIG.
An OM table is created and stored in the first and second memories 7.
It receives the data output from 2.73 as an address and outputs the 11 degree corresponding values stored in the corresponding address area as image data.

43 is a first memory for temporarily storing the output of the third memory 81;
44 is a second buffer that temporarily stores the output of the fourth memory 82, and 45 is a third buffer that temporarily stores the output of the fifth memory 83. 46 is B
(Black/Black) B (Blue/*) R (Red/Red)
The color select circuit receives a select signal, and its output is applied to first to third buffers 43 to 45.

The output of any one of these first to third buffers 743 to 45 becomes the output of the device shown in the figure. The operation of the device configured as described above will be explained as follows.

The optical information of the color original is incident on an optical means as shown in FIG. 3, and is separated into red and cyan. The separated red and cyan optical information are each COD/1. 1
．． The incident image is formed on 42 and converted into an electrical signal. The converted image signals enter amplifiers 51 and 52, where they are amplified to a predetermined level, and then sent to A/D converters 61 and 61, respectively.
2, it is converted to digital data. Arithmetic processing circuit 71
receives the red and cyan image data converted to digital data and normalizes it using the output value of the reference color (white). In other words, the image data of the reference color is set to 1oo, and the image data of each of the red and cyan colors are correct! , convert to q. The image data normalized in this way are transferred to VR,
VC.

Next, the arithmetic processing circuit 71 performs the calculations expressed by equations (1) and (2), and stores the results in the first and second memories 72.
73. That is, the luminance signal VR+VC is stored in the first memory 72, and the color difference signal Vc/(VR+VC
) is stored in the second memory 73. The outputs of the first and second memories 72 and 73 are given as address signals to the third to fifth memories 81 to 83. As a result, as shown in FIG. 5, the third to fifth memories 81 to 83, which are stored as ROM tables, output the density corresponding values stored at the addresses corresponding to the input addresses, and buffer them respectively. It is held at 43,44°45.

On the other hand, the color select circuit 46 receives the B, B, and R signals and provides a select signal to one of the first to third buffers 43 to 45. For example, when the first buffer 43 is selected, the red density corresponding value is output, and the second buffer 43 is selected.
When the third buffer 44 is selected, the cyan density corresponding value is output, and when the third buffer 45 is selected, the black system (white, gray, black) density corresponding value is output.

The output concentration corresponding value is converted into binary data (or multi-value data in some cases) using a threshold value set to (A vAm) by a binarization circuit (not shown).
By using field data as input data to a printer, copying machine, etc., it can be output and displayed externally. The above operations are repeated every time the C0D41.42 receives new optical information.

In the above-mentioned Nobi 1 light, c/(VR+VC) was used on the horizontal axis of the color separation map shown in Fig. 4, but VR/(V
R+VC). A similar effect on the horizontal axis can also be obtained by using (VR-Vc)/(VR+VC) or (Vc-VR)/(VR+VC) as the horizontal axis. For example, on the horizontal axis (Vp+ -Vc
) / (VR + VC), (Vg - Vc ) / (VR + VC) - 〇 There will be an achromatic color〉O reddish 0 cyanish color in the vicinity.

Furthermore, in the explanation of (e) above, a dichroic mirror with red transmission and cyan reflection type was used as the spectral characteristics, but the present invention is not limited to this.

Further, the color separation means is not limited to a dichroic mirror, but may be any device that can separate colors.

For example, it may be a spectral filter or the like. Furthermore, the color separation map is not limited to the T-shaped one shown in FIG. 4, but may be of any type.

In the above explanation, the color gamut of J5 is red and wild.

Although the case where three systems of black are used is taken as an example, the present invention is not limited to this. cyan, magenta.

Three types of yellow may be used. FIG. 7 is a block diagram showing another embodiment of the device of the present invention. In the embodiment shown in the figure, density corresponding values are obtained for each color gamut based on the color separation map shown in FIG. Optical information separated into red (red), green (green), and blue (blue) by an optical system (not shown) is charged and converted by C0D91 to C093 for each system. The photoelectrically converted signals are amplified to a predetermined level by subsequent amplifiers 94 to 96, and then sent to an A/D converter 97.
~9 are each converted into digital data.

The outputs of these A/D converters 97 to 9 are processed by the processing circuit (
The color separation information generation circuit>100 is entered and predetermined arithmetic processing is performed. On the other hand, the memory 101 stores cyan density correspondence values, the memory 102 stores magenta density correspondence values, and the memory 103 stores yellow density correspondence values independently for each color gamut. Therefore, the arithmetic processing circuit 100
receives input data from R2O and B, and outputs cyan and magenta.

Conversion is performed to select the yellow density corresponding value. Weird I! ! l! The results of the processing are given to memories 101-103 as address data. Memory 101-10
3 is stored at the address corresponding to the input address and outputs the density corresponding value, and the output density corresponding value is stored in the buffer 104.
~106 is temporarily held.

Color selection circuit 107 receives the B, G, and B selection signals and selects any one of buffers 104-106. The output of the selected buffer enters a comparator circuit 108, is compared with a threshold value given from a threshold circuit 109, and is multi-valued (2 (including a)).The output is multi-valued and the lc value is output. The color selection signal and density regulation signal from the color selection circuit 107 are input to the threshold circuit 109, and the threshold circuit 109 receives these two signals and generates an optimal threshold.

Next, an improved invention based on the second method described in the prior art section will be described. As mentioned above, in this case 1
Since the value of 0(I VA -log Vs represents the hue from approximately blue to red, intermediate color expression is possible by adjusting the output characteristics as shown in Figure 8. The axis shows log VA - log VB, and the vertical axis shows the density output value.Equipped with a ROM that stores i11 degree corresponding values of characteristics as shown in the figure for each of R, G, and B.
-3 would be enough. Note that the shaded area in the figure is the intermediate color expression area.

FIG. 9 is a block diagram showing another embodiment of the present invention. The embodiment shown in the figure outputs density-corresponding values for each color gamut based on the color separation map shown in FIG. Red illumination and blue illumination are performed sequentially, and the optical information separated into red and front threads is sent to a photoelectric conversion element 111, respectively.
The signal is converted into an electrical signal by the following amplifier 112 and amplified to a predetermined level. The amplified image signal enters the A/D converter 113 and is converted into digital data.

The outputs VR and VB of the A/D converter 113 are output from the selector 11.
The signals are synchronously entered into the arithmetic processing circuit 116 by the 4 and 1 line memories 115, and predetermined arithmetic processing is performed thereon.

On the other hand, the memory 118 stores cyan density values, the memory 119 stores magenta density values, and the memory 120 stores yellow density values for each color gamut. Therefore, the arithmetic processing circuit 117 receives VR, Ve (7) input data and performs conversion to select T, C, M, Y (7) density corresponding values. The results of the conversion process are given to memories 118-120 as address data. Memories 118-120 output the density-corresponding values stored at addresses corresponding to the input addresses, and the output density-corresponding values are temporarily held in buffers 1121-123.

Color selection circuit 124 selects one of the buffers 121-123. The output of the selected buffer enters the comparator circuit 125, is compared with the Iil value given from the threshold circuit 126, and is multivalued (including 2m conversion). The multivalued value becomes the output. The threshold circuit 126 has a node from the color select circuit 124 as described above.
A color select signal and a moisture level regulation signal are input, and the threshold circuit 126 receives these two signals and generates an optimal threshold value.

In the explanation of FIG. 6, the arithmetic processing circuit 71 includes VR+VC and V.
c/(VR+VC) operation and Δ/D converter 61.
The case where the normalization operation of the output of 62 is performed is taken as an example.

However, the present invention is not limited to this, and the A/D
The output of the converter 61.62 may immediately address the memory 72.73.

In this case, the memories 72 and 73 have VR+Vc corresponding to the input addresses VR and Vc, respectively.

It is preferable to use a ROM in which the result of calculating Vc/(VR+VC) is written in advance. Furthermore, in this case, the A/D converters 61 and 62 are programmed in advance so that full scale (FS) data of 1.0 is output when semi-white image data is input. If the full scale adjustment is made at 0.degree. C., the arithmetic processing circuit 71 becomes unnecessary.

(Effects of the Invention) As described above in detail, according to the present invention, by setting the corresponding value once for each color gamut independently,
An image processing method and apparatus that can effectively extract each color data can be realized. According to the present invention, it is also possible to express intermediate colors by outputting colors belonging to each color gamut independently and overlapping them.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an example of the method of the present invention, and FIG.
The figure shows the light source, dichroic mirror, and C used in the present invention.
FIG. 3 is a block diagram showing an example of optical means used in the present invention, FIG. 4 is a diagram showing an example of a color separation map according to the present invention, and FIG. 5 is a diagram showing an example of a ROM. A diagram showing an example of a table, FIG. 6 is a configuration block diagram showing an embodiment of the apparatus of the present invention, FIGS. 7 to 9 are diagrams showing other embodiments of the present invention, and FIG. 10 is a color separation optical system. Figures 11 and 12 are diagrams showing examples of color separation maps;
FIG. 13 is a diagram showing various methods of color separation. 17.17', 27.28, 29, 30.33...
Dichroic mirror 41.42.91-93...C0D 11...Photographing lens 13-16...Relay lens 18-20...R image tube 21-26.31.32...Prism 40.111・
...Photoelectric conversion means 43-4.5, 104-106, 121-123...
Buffer 46.107.124...Color selection circuit 50.
...Amplification section 51.52.94-96,112...Amplifier 60...
A/D converter 61, 62.97-99,113...A/D converter 70...color separation information creation means 71.116...arithmetic processing circuit 72,73.81-83,101- 103°118~1
20...Memory 8o...Concentration information storage means 114...Selector 115...1 line memory Patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 1 person Figure 1 Figure 2 (A) Wavelength s Angular shadow 3 Figure 33; Dichroic mirror Figure 4 Reflection turbidity VR + VC 131 (A) (C) 17.17; ;Relay lens 29.30i Dichroic mirror 18-20i Image 1-26;Prism

Claims (2)

[Claims] (1) Separate the original information into at least two colors for each wavelength range, photoelectrically convert the separated color signals, perform arithmetic processing on each photoelectrically converted image signal, and convert the colors based on the results of the arithmetic processing. An image processing method characterized in that each color gamut is set independently when separating. (2) Optical means for obtaining optical signals of at least two colors for each wavelength range from document information, photoelectric conversion means for converting the optical signals from the optical means into electrical signals, and each image of the photoelectric conversion means color separation information creation means for calculating the signal output and obtaining color separation information based on the result of the calculation processing;
An image processing apparatus comprising density information storage means in which a density data storage area that receives the output signal of the color separation information creation means as an address is set independently for each color gamut.