JPH1141622A - Image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor by which difference between a display image on a TV monitor and a printed image in the case of printing out a video signal is eliminated. SOLUTION: An image processing unit 100 has a conversion part 1, a lightness information generating part 2, a parameter selection part 3, a correction parameter library 4, and an inverse conversion part 5 and generates access information to a color correction parameter library or a lightness correction parameter library from a lightness component of inputted image data. Thus, a color or lightness correction parameter stored in the color correction parameter library or the lightness correction parameter library is suitably selected in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus, and more particularly to an image processing apparatus for automatically correcting input image data.

[0002]

2. Description of the Related Art Conventionally, when a video signal output from a photographing device such as a video device is printed, a display screen of a TV monitor and a printed image are determined by a relationship between white level luminance and black level luminance. There was a difference between them. This TV
As a method to eliminate the difference between the monitor display screen and the printed image, a highlight point and a dark point of the luminance data of the input video signal are set, and gradation conversion is performed so that the two points become white and black. Something to do is suggested.

However, in this gradation conversion process, there is no problem if the luminance level of the input image signal is normally distributed around an intermediate value, but a device for inputting a video signal to a video printer, for example, a still video camera In the case where the flash photography is performed by the camera or the overexposure is performed, there is a problem that the quality of the reproduced image is deteriorated.

As a method for solving the above-mentioned problem, Japanese Patent Application Laid-Open No. 4-35467 discloses an "image recording apparatus" which focuses on a luminance signal of an image signal and stores a plurality of conversion data.
A method has been proposed in which an image signal is converted by referring to conversion data that matches the luminance characteristics of an input image signal.

[0005]

However, this method is
Although the focus is on luminance, the color image has not undergone significant brightness or color adjustment, so the printed image
Unlike the display screen of the V monitor, it was far from satisfactory for the operator.

An object of the present invention is to solve the above-mentioned conventional drawbacks and to perform an accurate correction so that an image printed by an image processing apparatus for printing a video signal such as a video printer does not differ from a display screen of a TV monitor. It is an object of the present invention to provide an image processing apparatus capable of performing the following.

[0007]

In order to achieve the above object, an image processing apparatus according to the present invention comprises a converting means for converting an input image signal into a color component and a brightness component, and a brightness converted by the converting means. A first calculating unit that divides the brightness range of the component into predetermined regions, and calculates the frequency of belonging of pixel data to each of the divided regions; and divides the frequency data calculated by the first calculating unit into predetermined regions. Calculation means for calculating where each frequency belongs to each of the divided areas, storage means for storing a plurality of color correction parameters, calculation results of the first calculation means and the second calculation means And selecting means for selecting the color correction parameters classified and stored in the storage means based on the

The image processing apparatus according to the present invention comprises: a converting means for converting an input image signal into a color component and a brightness component; an input means for inputting brightness conversion information; and a storage means for storing a plurality of color correction parameters. A first calculating unit that divides a brightness range into predetermined regions based on the brightness conversion information input from the input unit, and calculates a frequency of belonging of pixel data to each of the divided regions; and a frequency calculated by the first calculating unit. A second calculating unit that divides data into predetermined regions and calculates where each frequency belongs to each of the divided regions; and a storing unit based on calculation results of the first calculating unit and the second calculating unit. Selecting means for selecting the color correction parameters stored in the classification.

The image processing apparatus of the present invention stores a conversion means for converting an input image signal into a color component and a lightness component, an input means for inputting lightness conversion information and color conversion information, and a plurality of color correction parameters. Storage means; first calculation means for dividing the brightness range into predetermined areas based on the brightness conversion information input from the input means, and calculating the belonging frequency of pixel data for each of the divided areas; Dividing the frequency data calculated in the above into predetermined areas, and calculating where each frequency belongs to each of the divided areas, and calculating results of the first calculating means and the second calculating means. Selection means for selecting the color correction parameters classified and stored in the storage means based on the information.

An image processing apparatus according to the present invention comprises a conversion means for converting an input image signal into a color component and a brightness component, and divides the brightness range of the brightness component converted by the conversion means into predetermined areas, A first calculating means for calculating the belonging frequency of the pixel data with respect to the image data; and a second calculating means for dividing the frequency data calculated by the first calculating means into predetermined regions and calculating to which of the divided regions each frequency belongs. (2) calculation means, storage means storing a plurality of brightness correction parameters,
Selecting means for selecting the brightness correction parameters classified and stored in the storage means based on the calculation results of the calculation means and the second calculation means; and a brightness component from the conversion means using the brightness correction parameters selected by the selection means. Convert the second
And a third conversion unit for forming a correction screen from the converted brightness data and color components converted by the second conversion unit.

An image processing apparatus according to the present invention comprises: a conversion unit for converting an input image signal into a color component and a brightness component; an input unit for inputting brightness conversion information; and a storage unit storing a plurality of brightness correction parameters. A first step of dividing the brightness range into predetermined regions from the brightness conversion information input from the input unit, and calculating the frequency of pixel data belonging to each of the divided regions.
Calculating means, dividing the frequency data calculated by the first calculating means into predetermined areas, and calculating where each frequency belongs to each of the divided areas; and first calculating means. Selecting means for selecting a brightness correction parameter classified and stored in the storage means based on the calculation result of the second calculating means, and converting the brightness component from the converting means using the brightness correction parameterer selected by the selecting means. And a third conversion unit for forming a correction screen from the converted brightness data and the color components converted by the second conversion unit.

The image processing apparatus of the present invention stores a conversion means for converting an input image signal into a color component and a brightness component, an input means for inputting brightness conversion information and color conversion information, and a plurality of brightness correction parameters. Storage means; first calculation means for dividing the brightness range into predetermined areas based on the brightness conversion information input from the input means, and calculating the belonging frequency of pixel data for each of the divided areas; Dividing the frequency data calculated in the above into predetermined areas, and calculating where each frequency belongs to each of the divided areas, and calculating results of the first calculating means and the second calculating means. Selection means for selecting a lightness correction parameter stored in the storage means based on the second correction means for converting a lightness component from the conversion means using the lightness correction parameter selected by the selection means. It is characterized in that a third transformation means for forming a correction screen from the conversion lightness data and color component converted by the second converting means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the image processing apparatus of the present invention will be described in detail with reference to the accompanying drawings. 1 to 22 show an embodiment of the image processing apparatus according to the present invention.

FIG. 1 is a block diagram showing the configuration of a first embodiment of the image processing apparatus of the present invention.
The image processing apparatus according to the present embodiment mainly includes a conversion unit 1, a brightness information generation unit 2, a parameter selection unit 3, a correction parameter library 4, and an inverse conversion unit 5.

The conversion unit 1 converts the input image data into a color component and a lightness component. For example, if the image data RGB is 3
When the color space is converted into the color space XYZ defined by the stimulus value, the CIELAB color space LAB, the luminance / color difference space YUV, and the HSV color space which is a standard color space in computer graphics, the color components are sequentially XZ, ab, and UV. , H
Y, L, Y, and V correspond to S and the brightness component, respectively. The conversion into each color space is performed by using a conversion formula defined by a conversion formula or by an interpolation calculation using a three-dimensional memory map method (Japanese Patent Laid-Open No. 5-75848). .

The brightness information generation unit 2 generates brightness information from the brightness component converted by the conversion unit 1. Here, generation of brightness information will be described. First, normalization is performed so that the minimum brightness measured by the monitor is 0 and the maximum brightness is 100%. Next, as shown in FIG.
The frequency (Li) corresponding to the arbitrary brightness Li up to 00 is taken. Here, a threshold value is set for the brightness, and M division is performed. In the present embodiment, as shown in FIG.
1 and Lth2.

Next, the total number of pixels targeted for brightness is represented by Tot.
al, the frequency at any brightness Li is hist (Li)
Then, the occupancy Sj (%) for each of the M divided sections is calculated by the following calculation formula 1.

[0018]

(Equation 1)

FIG. 4 shows a graph of the calculation result. Here, a threshold is also set for the occupancy, and the occupancy is divided into N. FIG. 4 shows an example of three divisions where the thresholds are th1 and th2. Next, based on Equation 2, a flag is generated by comparing the occupancy for each section with two thresholds, and is sent to the parameter selection unit 3 as shown in FIG.

[0020]

(Equation 2)

The parameter selection section 3 is provided with a correction parameter library 4 in which many correction parameters are stored. Information for selecting one appropriate parameter is sent from the brightness information generation section 2. Then, the correction parameter library 4 is accessed based on the transmitted information.

As described above, the appropriate color correction parameter is set to 1
Since information for selecting one is output, a desired parameter can be output from the correction parameter library 4. Note that the correction parameter library 4 stores correction parameters for the data types output by the brightness information generation unit 2. The color components are set so that common correction is performed without depending on brightness. Thereby, it is possible to realize a conversion in which the hue and the saturation such as the saturation are not changed, but only the brightness is changed. Appropriate parameters are loaded into the inverse transform unit 5.

The inverse conversion section 5 corrects the color component and brightness component image signals input from the conversion section 1 in accordance with the correction parameters sent from the parameter selection section 3, and corrects the corrected image R'G 'after correction. B ′ signal is output.

FIG. 2 shows an image processing apparatus 10 according to this embodiment.
0 is shown. First, when an image signal is input, the image signal is converted into a color component and a brightness component by the conversion unit 1 (step 201).

Next, the brightness information generation unit 2 generates brightness information for accessing the correction parameter library 4 from the brightness components converted in step 201 (step 202).

Next, the correction parameter library 4 is accessed with the brightness information generated by the brightness information generation unit 2 (step 203), and a correction parameter is selected (step 2).
04).

Next, in accordance with the correction parameters sent from the parameter selection unit 3, the inverse conversion unit 5 corrects the color component and lightness component image signals input from the conversion unit 1, and obtains a corrected image R 'after correction. A G'B 'signal is output (step 205).

As described above, the image processing apparatus 100 according to the present embodiment can automatically calculate the brightness characteristics of an input image and perform accurate correction.

FIG. 6 is a block diagram showing the configuration of the second embodiment of the image processing apparatus according to the present invention.
In the image processing apparatus 200 of the present embodiment, a brightness information input unit 6 is further provided in the image processing apparatus 100 of the first embodiment shown in FIG. The brightness information generation unit 2 generates access information to the correction parameter library 4 based on the brightness information input from the brightness information input unit 6.

The brightness information generation unit 2 is provided with a flag_Sj conversion unit 22 as shown in FIG. 7, and converts the data input from the brightness information input unit 6 into a flag_Sj
Convert to g_Sj. Thereby, the same processing as that of the image processing apparatus 100 according to the first embodiment can be executed.

FIG. 8 shows an image processing apparatus 20 according to this embodiment.
0 is shown. First, when an image signal is input, the image signal is converted into a color component and a brightness component by the conversion unit 1 (step 801).

Next, information data relating to the brightness is input to the brightness information input unit 6 so that the brightness of the image becomes the brightness desired by the operator.
Is entered from In this example, the brightness related to the brightness as shown in FIG. The brightness information generation unit 2 generates brightness information for accessing the correction parameter library 4 from the information data on brightness input from the brightness information input unit 6 (step 80).
2).

Next, the correction parameter library 4 is accessed using the brightness information generated by the brightness information generation unit 2 (step 803), and a correction parameter is selected (step 8).
04).

Next, in accordance with the correction parameters sent from the parameter selection unit 3, the inverse conversion unit 5 corrects the color component and lightness component image signals input from the conversion unit 1, and the corrected corrected image R ' A G'B 'signal is output (step 805).

As described above, the image processing apparatus 200 of the present embodiment does not need to calculate the lightness frequency, so that high-speed processing can be realized.

FIG. 10 shows a third embodiment of the image processing apparatus according to the present invention.
2 is a block diagram showing the configuration of the embodiment. The image processing apparatus 300 of the present embodiment is different from the image processing apparatus 100 of the first embodiment in that the brightness / color information input unit 7
Are arranged. The conversion information generation unit 8 generates access information to the correction parameter library 4 based on the brightness information input from the brightness / color information input unit 7.

It should be noted that the conversion information generation unit 8 has a flag_
An Sj conversion unit 22, a brightness parameter selection unit 23, and a color parameter selection unit 24 are provided. In FIG.
An example of color information input from the brightness / color information input unit 7 is shown. In this example, the image color is divided into six levels of yellow, green, cyan, blue, magenta, and red, and the intensity of the color is divided into two levels of low and medium. Is generated.

The correction parameter library 4 in the image processing apparatus 300 of this embodiment is a two-dimensional library of lightness × color. An appropriate parameter is selected based on the information of the conversion information generation unit 8.

FIG. 12 shows an image processing apparatus 3 according to this embodiment.
The operation flow of 00 is shown. First, when an image signal is input, it is converted into a color component and a brightness component by the conversion unit 1 (step 121).

Next, information data relating to the brightness and information data relating to the color are input from the brightness / color information input unit 7 so that the brightness and the color of the image become the brightness desired by the operator. Lightness and color information for accessing the correction parameter library 4 is generated from the information data on lightness and color input from the lightness / color information input unit 6 (step 122).

Next, the correction parameter library 4 is accessed using the brightness and color information generated by the conversion information generation unit 8 (step 123), and a correction parameter is selected (step 124).

Next, the inverse conversion unit 5 corrects the color component and lightness component image signals input from the conversion unit 1 in accordance with the correction parameters sent from the parameter selection unit 3, and corrects the corrected image R 'after correction. A G'B 'signal is output (step 125).

As described above, the image processing apparatus 300 of the present embodiment does not need to calculate the lightness frequency, and can realize high-speed processing. Also, color adjustment can be performed.

FIG. 14 shows a fourth embodiment of the image processing apparatus according to the present invention.
2 is a block diagram showing the configuration of the embodiment. In the image processing apparatus 400 according to this embodiment, a brightness correction parameter library 9 in which many brightness correction parameters are stored in a parameter selection unit 3 is provided. The brightness correction parameter library 9 stores parameters for performing only brightness conversion having a characteristic of converting input / output brightness as shown in FIG.

FIG. 16 shows an image processing apparatus 4 according to this embodiment.
The operation flow of 00 is shown. First, when an image signal is input, it is converted into a color component and a brightness component by the conversion unit 1 (step 161).

Next, the brightness information generation unit 2 generates brightness information for accessing the brightness correction parameter library 9 from the brightness components converted in step 161 (step 162).

Next, the brightness correction parameter library 9 is accessed using the brightness information generated by the brightness information generation unit 2 (step 163), and the brightness correction parameters are selected.
The selected brightness correction parameter is sent to the brightness conversion unit 10 (step 164).

Next, in the brightness conversion unit 10, the conversion unit 1
Is converted (step 16).
5). The brightness conversion is performed, for example, by using an LUT (Look up T
able) method.

Next, an image signal is corrected by the inverse conversion unit 5 using the brightness component and the color component converted by the brightness conversion unit 10, and the corrected corrected image R'G'B 'signal is obtained. Output (Step 166).

As described above, the image processing apparatus 400 according to the present embodiment can automatically calculate the characteristics of an input image and perform accurate correction. The color conversion parameter is 1
Since only the type is required, the capacity of the parameter library can be reduced.

FIG. 17 shows a fifth embodiment of the image processing apparatus of the present invention.
2 is a block diagram showing the configuration of the embodiment. In the image processing apparatus 500 according to the fifth embodiment, the brightness information input unit 6 is further provided in the image processing apparatus 400 according to the embodiment in FIG. As shown in FIG. 19, the lightness information generation unit 2 is provided with a flag_Sj conversion unit 22, and converts the data input from the lightness information input unit 6 to f
lag_Sj. The brightness information input from the brightness information input unit 6 is information for selecting a suitable brightness conversion parameter in the brightness correction parameter library via the flag_Sj conversion unit 22 and the parameter selection unit 3.

FIG. 18 shows an image processing apparatus 50 according to this embodiment.
0 is shown. First, when an image signal is input, it is converted into a color component and a lightness component by the conversion unit 1 (step 181).

Next, information data relating to the brightness is input from the brightness information input unit 6 so that the brightness of the image becomes the brightness desired by the operator. In this example, the brightness related to the brightness as shown in FIG. The brightness information generation unit 2 uses a brightness correction parameter library 9 based on the brightness data input from the brightness information input unit 6.
Generate brightness information for accessing (Step 1)
82).

Next, the brightness correction parameter library 9 is accessed with the brightness information generated by the brightness information generation unit 2 (step 183), a brightness correction parameter is selected, and the selected brightness correction parameter is sent to the brightness conversion unit 10. I do. (Step 184).

Next, in the brightness conversion unit 10, the conversion unit 1
Is converted (step 18).
5). The brightness conversion is performed, for example, by using an LUT (Look up T
able) method.

Next, an image signal is corrected by the inverse conversion unit 5 using the brightness component and the color component converted by the brightness conversion unit 10, and the corrected corrected image R'G'B 'signal is output. (Step 186).

As described above, the image processing apparatus 5 of this embodiment
In the case of 00, the calculation of the lightness frequency becomes unnecessary, and high-speed processing can be realized. Also, since only one type of color conversion parameter is required, the capacity of the parameter library can be reduced.

FIG. 20 shows a sixth embodiment of the image processing apparatus according to the present invention.
Is shown. The image processing apparatus 600 of this embodiment further includes a color information input unit 11, a color information setting unit 12, and a color correction parameter library 13 in the image processing apparatus 500 of the fifth embodiment shown in FIG. ing. As shown in FIG. 21, a flag_Sj conversion unit 22 is provided in the brightness information generation unit 2, and the data input from the brightness information input unit 6 is converted to flag_Sj.
Convert to The brightness information input from the brightness information input unit 6 passes through the flag_Sj conversion unit 22 and the parameter selection unit 3 to generate information indicating a suitable brightness conversion parameter in the brightness correction parameter library.

The color information input from the color information input unit 11 generates information indicating a suitable lightness conversion parameter in the color correction parameter library 13 via the color information setting unit 12.

FIG. 22 shows an image processing apparatus 60 according to this embodiment.
0 is shown. First, when an image signal is input, it is converted into a color component and a brightness component by the conversion unit 1 (step 221).

Next, information data relating to the brightness is input to the brightness information input unit 6 so that the brightness of the image becomes the brightness desired by the operator.
Is entered from In this example, the brightness related to the brightness as shown in FIG. The brightness information generation unit 2 generates brightness information for accessing the correction parameter library 4 from the information data on brightness input from the brightness information input unit 6 (step 22).
2).

Next, the brightness correction parameter library 9 is accessed with the brightness information generated by the brightness information generation unit 2 (step 223), and the brightness correction parameters are selected.
The selected brightness correction parameter is sent to the brightness conversion unit 10. (Step 224).

Next, the color information setting section 12 generates information for accessing the color correction parameter library 13 from the color information input by the color information input section 11 (step 22).
5). The color information generated by the color information setting unit 12 is accessed to the color correction parameter library 13, an appropriate color correction parameter is selected, and transmitted to the inverse conversion unit 2 (step 226).

Next, an image signal is corrected by the inverse conversion unit 5 using the brightness component and the color component converted by the brightness conversion unit 10, and the corrected corrected image R'G'B 'signal is obtained. Output (Step 227).

Next, in the brightness conversion section 10, the conversion section 1
Is converted (step 22).
8). The brightness conversion is performed, for example, by using an LUT (Look up T
able) method.

As described above, the image processing apparatus 3 of this embodiment
In the case of 00, the calculation of the lightness frequency becomes unnecessary, and high-speed processing can be realized. Also, color adjustment can be performed.

[0067]

As is apparent from the above description, according to the image processing apparatus of the present invention, the first calculating means and the second calculating means store the color correction parameters from the brightness components of the input image data. Since the access information to the stored storage unit or the storage unit in which the brightness correction parameter is stored is generated, the selection of the color correction parameter or the brightness correction parameter by the selection unit can be performed accurately and in a short time.

According to the image processing apparatus of the second, third, fifth or sixth aspect, externally input access information to the storage means storing the color correction parameters or the storage means storing the brightness correction parameters. Calculation process for obtaining access information is unnecessary,
High-speed processing becomes possible. In addition, it is possible to provide an image desired by the operator.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an image processing apparatus according to the present invention.

FIG. 2 is a flowchart illustrating an operation example of the image processing apparatus.

FIG. 3 is a diagram showing a relationship between lightness and frequency.

FIG. 4 is a diagram showing a relationship between brightness and occupancy.

FIG. 5 is a diagram illustrating a parameter selection unit.

FIG. 6 is a block diagram illustrating a configuration example of a second embodiment of the image processing apparatus according to the present invention.

FIG. 7 is a detailed block diagram of a brightness information generation unit.

FIG. 8 is a flowchart showing an operation example of the image processing apparatus of FIG. 6;

FIG. 9 is a diagram illustrating an example of brightness information.

FIG. 10 is a block diagram illustrating a configuration example of an image processing apparatus according to a third embodiment of the present invention.

FIG. 11 is a detailed block diagram of a conversion information setting unit.

FIG. 12 is a flowchart illustrating an operation example of the image processing apparatus in FIG. 10;

FIG. 13 is a diagram illustrating an example of color information.

FIG. 14 is a block diagram illustrating a configuration example of an image processing apparatus according to a fourth embodiment of the present invention.

FIG. 15 is a diagram illustrating a storage example of a brightness correction parameter library.

FIG. 16 is a flowchart illustrating an operation example of the image processing apparatus in FIG. 14;

FIG. 17 is a block diagram illustrating a configuration example of a fifth embodiment of the image processing apparatus according to the present invention.

FIG. 18 is a flowchart illustrating an operation example of the image processing apparatus in FIG. 17;

FIG. 19 is a detailed block diagram of a brightness information setting unit.

FIG. 20 is a block diagram illustrating a configuration example of a sixth embodiment of the image processing apparatus according to the present invention.

FIG. 21 is a diagram illustrating details of a brightness information setting unit and a color information setting unit.

FIG. 22 is a flowchart illustrating an operation example of the image processing apparatus in FIG. 20;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 conversion unit 2 brightness information generation unit 3 parameter selection unit 4 correction parameter library 5 inverse conversion unit 6 brightness information input unit 7 brightness / color information input unit 8 conversion information setting unit 9 brightness correction parameter library 10 brightness conversion unit

Claims (6)

[Claims] A conversion unit configured to convert an input image signal into a color component and a brightness component; dividing a brightness range of the brightness component converted by the conversion unit into predetermined regions; A first calculating means for calculating the belonging frequency of the pixel data; and a frequency calculating means for dividing the frequency data calculated by the first calculating means into predetermined regions and calculating to which of the divided regions each frequency belongs. 2, a storage unit in which a plurality of color correction parameters are stored, and the color correction parameters classified and stored in the storage unit based on the calculation results of the first calculation unit and the second calculation unit. An image processing apparatus comprising: a selection unit for selecting. 2. A conversion means for converting an input image signal into a color component and a lightness component; an input means for inputting lightness conversion information; a storage means in which a plurality of color correction parameters are stored; A first calculating unit that divides a brightness range into predetermined regions from the obtained brightness conversion information, and calculates a frequency of belonging of pixel data to each of the divided regions; and calculates the frequency data calculated by the first calculating unit. A second calculating means for calculating where each frequency belongs to each of the divided areas; and a storing means based on calculation results of the first calculating means and the second calculating means. Selecting means for selecting the color correction parameters stored as classified. A conversion unit configured to convert an input image signal into a color component and a brightness component; an input unit configured to input brightness conversion information and color conversion information; a storage unit storing a plurality of color correction parameters; A first calculating unit that divides a lightness range into predetermined regions from the lightness conversion information input from the input unit, and calculates a frequency of belonging of pixel data to each of the divided regions; Dividing the divided frequency data into predetermined regions, and calculating where each frequency belongs to each of the divided regions, based on calculation results of the first calculation unit and the second calculation unit. Selecting means for selecting the color correction parameters classified and stored in the storage means. 4. A conversion means for converting an input image signal into a color component and a lightness component; dividing the lightness range of the lightness component converted by the conversion means into predetermined regions; First calculating means for calculating the belonging frequency; and second calculating means for dividing the frequency data calculated by the first calculating means into predetermined areas and calculating to which of the divided areas each frequency belongs. Means, storage means for storing a plurality of brightness correction parameters, and selection for selecting the brightness correction parameters classified and stored in the storage means based on the calculation results of the first calculation means and the second calculation means. Means, a second conversion means for converting the brightness component from the conversion means using the brightness correction parameter selected by the selection means, and a conversion means converted by the second conversion means. An image processing apparatus, comprising: third conversion means for forming a correction screen from lightness data and the color component. 5. A conversion means for converting an input image signal into a color component and a lightness component; an input means for inputting lightness conversion information; a storage means in which a plurality of lightness correction parameters are stored; A first calculating unit that divides a brightness range into predetermined regions from the obtained brightness conversion information, and calculates an attribute frequency of pixel data with respect to each of the divided regions; and calculates the frequency data calculated by the first calculating unit. A second calculating unit that divides the frequency into predetermined regions and calculates where each frequency belongs to each of the divided regions; and a storage unit based on calculation results of the first calculating unit and the second calculating unit. Selecting means for selecting the lightness correction parameter stored in a classifying manner; and a second means for converting the lightness component from the conversion means using the lightness correction parameterer selected by the selecting means. An image processing apparatus comprising: a conversion unit; and a third conversion unit that forms a correction screen from the converted lightness data converted by the second conversion unit and the color component. 6. A conversion unit for converting an input image signal into a color component and a brightness component, an input unit for inputting brightness conversion information and color conversion information, a storage unit storing a plurality of brightness correction parameters, A first calculating unit that divides a brightness range into predetermined regions from the brightness conversion information input from the input unit, and calculates a frequency of pixel data belonging to each of the divided regions; Dividing the divided frequency data into predetermined regions, and calculating where each frequency belongs to each of the divided regions, based on calculation results of the first calculation unit and the second calculation unit. Selecting means for selecting the lightness correction parameter classified and stored in the storage means; and using the lightness correction parameter selected by the selecting means to output the lightness component from the conversion means. Image processing, comprising: second conversion means for converting the minutes; and third conversion means for forming a correction screen from the converted lightness data converted by the second conversion means and the color components. apparatus.