JPH08211514A - Color copying device and method for deciding exposure of color copying device - Google Patents

Abstract

PURPOSE: To always obtain a high-quality print in spite of the change of the characteristic of film such as secular deterioration by deciding exposure by using average image data expressing the average value of original image data stored in a 1st storage means and image data including the larger number of frames than the original image and stored in a 2nd storage means. CONSTITUTION: In an exposure deciding device 32, the image data expressing the characteristic of the original image is generated by an image data generating means based on the photometric value of the original image recorded on a film. The image data is stored in the 1st storage means 30, and the image data including the larger number of frames than that of the image data on the original image stored in the 1st storage means 30 is stored in the 2nd storage means 30. An operation expression decision means obtains the average image data expressing the average value of the image data stored in the 2nd storage means 30, and a known exposure operation expression for deciding the exposure is decided by using the image data stored in the 1st storage means 30 and the obtained average image data. The exposure is obtained based on the decided operation expression and exposure control is performed by an exposure control means based on the obtained exposure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color copying machine and a method for determining the exposure amount of the color copying machine, and more particularly to a color copying machine for copying a color original image and a color copying machine for determining the exposure quantity in the color copying machine. Exposure amount determination method.

[0002]

2. Description of the Related Art When an original image recorded on a color negative film is copied on a copying material such as photographic paper, it is possible to transmit light of three colors of B (blue), G (green) and R (red) which have passed through the original image. It is known empirically that the ratio should generally be a substantially constant ratio. Therefore, in the photo printing apparatus, the exposure amount is determined based on the following formula.

LogEj = Kj + Dj (1) where logE is the logarithm of the exposure amount, K is a constant, D is the density (for example, LATD) of the original image measured by the photometry system, and j is R, G, B. Represents any of the colors. Further, when the original image is printed by the photographic printing apparatus with the exposure amount obtained based on the above formula (1), the print from the underexposed original image is the proper exposure original image due to the characteristics of the photographic printing apparatus and the copying material. The prints from the overexposed original image may be less dense than the prints from
Therefore, the exposure amount is determined by correcting Dj in equation (1) according to the density of the original image.

However, with the exposure amount determined using only the photometric data obtained by photometrically measuring the original image, the colors and densities between the prints may not be uniform, and a good finished print may not be obtained.

In one film or a series of films in which a predetermined number of original images are continuous, since the characteristics of the films are the same or similar, each of the original images of a frame to be printed (hereinafter referred to as a print frame). The characteristics of are also similar. In order to print the original image of this print frame in a good color, the average density value of the original image for a series of film frames including print frames or one film frame including print frames for the image density of each original image. And the density of each original image are used to determine the exposure amount (Japanese Patent Laid-Open No. 51-112345 and Japanese Patent Laid-Open No. 54-1).
10829 publication). As a result, variations in color and density of one or a series of films can be suppressed.

There is an abnormal film (hereinafter referred to as an abnormal film) in a different state from a film in a standard state (hereinafter referred to as a normal film). This abnormal film includes a film whose characteristics have deteriorated with time, a film containing an original image photographed by a photographing light source other than daylight, and a film developed in a remarkably poor developing state among the developing states which differ from one development place to another. Etc. are mentioned as an example. In the above method, unless an abnormal film or a normal film is distinguished and the exposure amount for that is determined,
Prints on either film do not give a good finish.

As a technique for obtaining a print having a good finish from such an abnormal film, there is disclosed in Japanese Patent Laid-Open No. 55-4.
In 6741 publication, one film is measured in advance,
Obtain a color density difference curve for (R + G + B) / 3 density,
A method has been proposed in which exposure control is performed by the pixel density of pixels corresponding to a neutral color subject. In this method, a color density difference curve is generated from one film including print frames, and using the generated color density difference curve, the pixel density of a pixel corresponding to a neutral color subject is irrespective of whether the film is normal or abnormal. Could be detected.

However, according to the above method, when one film contains an original image of a subject whose color is biased such as lawn or sea, a correct color density difference curve cannot be generated due to the bias of these colors, The exposure amount is uneven in color. Therefore, good print quality cannot be obtained unless the abnormal film and the normal film are distinguished.

Further, image data of original images of print frames, average image data of one film including print frames (short-term storage information), and image data of a large number of films of the same film type (long-term storage information). Therefore, there is known an apparatus and method for determining an exposure amount by setting a weighting coefficient based on the number of accumulated data and the like in a well-known arithmetic polynomial for determining the exposure amount (Japanese Patent Laid-Open No. 5-28920).
7 and JP-A-5-303152). With this apparatus and method, it is possible to obtain prints of improved quality over both normal and abnormal films.

However, both the normal film and the abnormal film may contain unique original image frames having different characteristics from other original images (hereinafter referred to as abnormal frames). When trying to obtain a print from an original image of such an abnormal frame, the exposure amount is determined with the same characteristics as other original images, so that a good-finished print cannot be obtained.

Generally, a frame which is supposed to be an abnormal frame is
It is well known that a good print can be obtained by determining the exposure amount with a high color correction, but if a judgment error occurs when judging an abnormal frame, a color ferria will occur and an undesirable color A print will be formed. Therefore, high determination accuracy for abnormal frames is required.

Further, as a means for detecting an abnormal frame, a characteristic value for identifying an abnormal original image of one film including a print frame (maximum density of each color in the screen, area of highly saturated color, etc.) is obtained, and an average of these characteristic values is obtained. A technique for finding an abnormal frame using a value has been proposed (Japanese Patent Laid-Open No. 57-111136). Similar to the abnormal film, this abnormal frame contains the original image recorded on the film that has deteriorated with time, the original image recorded on the film shot with a shooting light source other than daylight, and the development state that is different for each laboratory. There are original images and the like recorded on the developed film. This technique requires a lot of time and labor to develop a method for determining a abnormal frame and is not efficient. Further, there is a drawback that a film on which a subject such as a blue sky having a color deviation is reflected is erroneously determined.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above facts, and it is different depending on a film due to deterioration over time, a film containing an original image by a photographing light source other than daylight, and a developing station. It is an object of the present invention to provide a color copying machine and a method of determining the exposure amount of a color copying machine, which can always obtain a high quality print regardless of changes in film characteristics of a film developed in a poor developing state.

[0014]

In order to achieve the above object, a color copying apparatus according to a first aspect of the present invention divides an original image recorded on a film or a series of films into a large number of pixels. A photometric means for color-separating into at least three primary colors for photometry, an image data generating means for generating image data representing the characteristics of the original image based on the photometric value of the original image, and a first memory for storing the image data. Storage means, second storage means for storing image data having a number of frames greater than the number of frames of the image data of the original image stored in the first storage means, and stored in the second storage means. The average image data representing the average value of the
Computation formula determining means for determining an exposure computation formula for determining the exposure amount using the image data stored in the storage means and the determined average image data, and an exposure for determining the exposure amount based on the determined computation formula An amount calculation means and an exposure control means for performing exposure control based on the exposure amount obtained by the exposure amount calculation means are provided.

A color copying apparatus according to a second aspect of the present invention is a photometric device which divides an original image recorded on one film or a series of films into a large number of pixels, and separates at least three primary colors to perform photometry. And image data generating means for generating image data representing the characteristics of the original image based on the photometric value of the original image, first storing means for storing the image data, and storing in the first storing means. Second storage means for storing image data having a number of frames greater than the number of frames of the image data of the generated original image, image data stored in the first storage means and the second storage means. Determining means for determining an abnormal film based on the image data, an exposure amount calculating means for determining the exposure amount of the original image based on the determination result of the determining means, and an exposure amount calculated by the exposure amount calculating means. And a, and an exposure control means for controlling exposure have.

A color copying apparatus according to a third aspect of the present invention is a photometric device which divides an original image recorded on one film or a series of films into a large number of pixels, and separates at least three primary colors to perform photometry. An image data generating means for generating image data based on the photometric value of the original image; a first storing means for storing image data of a large number of frames included in the film; Second storage means for storing image data for a large number of frames over a large number of films;
Representing an average value of image data stored in the storage means of
Average image data of the first storage means and the second average image data representing the average value of the image data stored in the second storage means, and the obtained average image data of the first storage means and the second storage means. Determining means for determining the film having the average image data that does not correspond to the second average image data as an abnormal film based on the average image data, and exposing the original image based on the determination result of the determining means. Exposure amount calculation means for obtaining the amount, and exposure control means for performing exposure control based on the exposure amount obtained by the exposure amount calculation means,
It has.

According to a fourth aspect of the present invention, there is provided a color copying apparatus in which the original image stored on one film or a series of films is divided into a large number of pixels, and at the same time, at least three primary colors are color-separated to perform photometry. And image data generating means for generating image data representing the characteristics of the original image based on the photometric value of the original image, image data for multiple frames contained in the film, or a large number of films of the same film type as the film. Storage means for storing image data for a large number of frames over a book film, and average image data representing an average value of the image data stored in the storage means, and image data not corresponding to the obtained average image data. Determination means for determining the original image; exposure amount calculation means for obtaining the exposure amount of the original image based on the determination result of the determination means; And a, and an exposure control means for controlling exposure on the basis of the exposure amount determined in amount calculating means.

According to a fifth aspect of the present invention, there is provided a method for determining an exposure amount of a color copying apparatus, wherein an original image recorded on a film or a series of films is divided into a large number of images and color separation is performed into at least three primary colors. To generate an image data representing the feature of the original image based on the photometric value of the original image, and to express an average value of the image data of the original image and the image data of a large number of frames included in the film. Exposure data is determined using the average image data of at least two of the second average image data representing the average value of the image data of multiple frames over multiple films of the same film type as the film. To do.

According to a sixth aspect of the present invention, there is provided a method for determining an exposure amount of a color copying apparatus, in which a recorded original image of a film or a series of films is divided into a large number and color separation is performed into at least three primary colors. To generate an image data representing the feature of the original image based on the photometric value of the original image, and to express an average value of the image data of the original image and the image data of a large number of frames included in the film. Of the first average image data and at least two data of the second average image data representing the average value of the image data of multiple frames over multiple films of the same film type as the film. Or, determining at least one of the original image having image data that does not correspond to the second average image data and the film having average image data that does not correspond, Based on the serial determination result to determine the amount of exposure.

According to a seventh aspect of the present invention, there is provided a method of determining an exposure amount of a color copying apparatus, wherein an original image recorded on a film or a series of films is divided into a large number of pieces and color separation is performed into at least three primary colors. Photometrically, and based on the photometric value of the original image, image data representing the characteristics of the original image is generated for at least each frame to be printed included in the film, and the image data is included in the film in the first storage means. Image data representing the characteristics of all original images to be printed is stored, image data for a large number of frames over a large number of films of the same film type is stored in the second storage means, and is stored in the first storage means. The exposure performance is performed based on the first average image data representing the average value of the image data stored and the second average image data representing the average value of the image data stored in the second storage means. A formula is determined, effective image data of the original image to be printed is obtained based on the first average image data or the second average image data, and the exposure calculation formula and the effective image data of the original image to be printed are obtained. The amount of exposure is determined based on this.

An exposure amount determining method for a color copying apparatus according to an eighth aspect of the present invention is the exposure amount determining method for a color copying apparatus according to the seventh aspect, wherein the first average image data and the second average image data are used. When the average image data differs from the average image data by a predetermined value or more, a common exposure calculation formula is determined for the film. The method of determining the exposure amount of the color copying apparatus of
When the first average image data and the second average image data are different from each other by a predetermined value or more, a common exposure calculation formula is determined for the film.

An exposure amount determining method for a color copying apparatus according to a ninth aspect of the present invention is the exposure amount determining method for a color copying apparatus according to the seventh aspect, wherein the first average image data and the second average image data are used. Predetermine a function that represents the relationship with the average image data,
The exposure calculation formula is determined using the function.

An exposure amount determining method for a color copying apparatus according to a tenth aspect of the present invention is any one of the fifth to seventh aspects.
The method for determining the exposure amount of the color copying apparatus according to the above item,
The second average image data is used as a reference, and image data is generated for pixels excluding pixels corresponding to high saturation.

[0024]

According to the first aspect of the invention, the image data representing the characteristics of the original image is generated by the image data generating means based on the photometric value of the original image recorded on the film. As the image data, photometric data, selection data in which data necessary for determining the exposure amount is selected from the photometric data, average values, added values and data of the photometric data or the selected data classified by density As a result of calculating the number, a density histogram, a color density difference histogram, a density cumulative curve, a color density difference cumulative curve, or the like can be used. The image data is stored in the first storage means, and the second storage means stores image data having a number of frames larger than the number of frames of the image data of the original image stored in the first storage means. The arithmetic expression determining means obtains average image data representing an average value of the image data stored in the second storage means, and the exposure amount is calculated using the image data stored in the first storage means and the obtained average image data. A well-known exposure calculation formula for determining is determined.
The exposure amount is calculated by the exposure amount calculation means based on the determined calculation formula, and the exposure control means controls the exposure based on the calculated exposure amount.

As the image data, it is preferable to adopt data relating to density. Generally, the stored image data has different three-color balance depending on the density, and therefore it is necessary to use image data having the three-color balance at the same density as the original image. The image data of the number of frames larger than the number of frames stored in the first storage unit, which is stored in the second storage unit, generally has a hue obtained by integrating the densities of three colors of gray or a constant hue close to gray. Represents On the other hand, in the image data based on the photometry of the original image of the film on which the original image to be printed is stored, which is stored in the first storage means, the color balance obtained by integrating the densities of the three colors is recorded on the film. It represents the tendency of the overall color balance of a plurality of original images and reflects the characteristics of the film including changes due to deterioration over time (three-color sensitivity balance, three-color gradation balance, three-color density balance, etc.). . Therefore, by comparing the image data of the first storage means with the image data of the second storage means and determining at least the exposure calculation formula for the normal frame or the abnormal frame, the deterioration with time or the like will occur. Even with film characteristics, the exposure amount is determined in consideration of gray or a constant hue close to gray. As a result, high-quality prints can always be obtained regardless of changes in film characteristics such as deterioration over time.

According to the second aspect of the present invention, the image data and the second image data stored in the first storage means by the determination means.
The abnormal film is determined based on the image data stored in the storage means, and the exposure amount of the original image is obtained based on the determination result. As described in the section of the operation of claim 1, the image data of the second storage means corresponds to the characteristics of a general film having a gray or a constant hue close to gray, and the image data of the first storage means. Will reflect the properties of the film containing the original image to be printed. Therefore, an abnormal film having a characteristic different from that of a general film can be determined.

According to the third aspect of the invention, the first storage means stores the image data of a large number of frames contained in the film, and the second storage means stores a large number of films of the same film type as the film. Image data for frames is stored. The determining means abnormalizes the film having the second average image data and the non-corresponding average image data based on the first average image data by the first storage means and the second average image data by the second storage means. Judge as a film. The exposure amount of the original image is obtained based on this determination result, and the exposure is controlled based on the obtained exposure amount. Since the balance of the three colors described above differs depending on the film type, it is necessary to obtain the balance for each film type.
Thus, the second average image data for multiple frames across multiple films of the same film type will be the standard hue corresponding to the film type, ie, gray or a constant hue close to gray. Therefore, for the film containing the original image to be printed, the abnormal film can be determined from this standard hue.

In the fourth aspect of the invention, the storage means stores the image data of a large number of frames contained in the film or the image data of a large number of frames over a large number of films of the same film type as the film. The determination means obtains average image data representing an average value of the stored image data, and determines an original image having image data that does not correspond to the obtained average image data. The exposure amount of the original image is obtained based on this determination result, and the exposure is controlled based on the obtained exposure amount. In this way, the image data stored in the storage means is the original image of many frames. Therefore, in the obtained average image data, the hue obtained by accumulating the densities of the three colors that are generally used as the original image is gray or a constant hue close to gray. This makes it possible to determine whether or not the original image to be printed is different from the hue that is generally used as the original image.

In the invention described in claim 5, the image data of the original image generated based on the photometric value obtained by photometrically measuring the original image recorded on the film, and the first average image data for many frames included in the film. , And the color density difference of at least two data of the second average image data for multiple frames over multiple films of the same film type as the film to determine the exposure amount. Thus, at least one of the first average image data and the second average image data is adopted to determine the exposure amount.
As described in the section of the function of the invention, the exposure amount is determined in consideration of general gray or a constant hue close to gray, and high quality printing is always performed regardless of changes in film characteristics such as deterioration with time. Obtainable.

According to the sixth aspect of the invention, the image data of the original image, the first average image data of a large number of frames contained in the film, and the first frame of a large number of frames of a plurality of films of the same film type as the film. At least one of an original image having image data not corresponding to the first average image data or the second average image data and a film having non-corresponding average image data is determined from at least two data of the two average image data. Then, the exposure amount is determined based on the determination result. Therefore, as described in the operation of the invention of claim 3, it is possible to judge an abnormal film from a standard hue of the same film type for a film containing an original image to be printed, and to obtain a higher quality image. You can get a print.

According to the seventh aspect of the present invention, the image data representing the characteristics of the original image is generated for at least each frame to be printed included in the film, and represents the characteristics of all the original images to be printed included in the film. An exposure calculation formula is determined based on the first average image data for the image data and the second average image data for a large number of frames over a large number of films of the same film type. Effective image data of the original image to be printed is obtained based on the average image data, and the exposure amount is determined based on the exposure calculation formula and the effective image data of the original image to be printed. Therefore, consider the gray hue of the film to be printed or a constant hue close to gray, or consider the standard hue of the same film type, and set the exposure formula to a large number of frames so as not to be affected by changes in film characteristics. Since the exposure amount can be determined from the first average image data and the second average image data, and the effective image data obtained from the image data of the original image to be printed can determine the exposure amount even if there is a change in the characteristics of the film itself, The optimum exposure amount can be determined according to the characteristics of the original or standard film and the characteristics of the original image to be printed.

In this case, as described in claim 8,
When the first average image data and the second average image data are different from each other by a predetermined value or more, a common exposure calculation formula may be set for the film. Further, as described in claim 9, a function representing the relationship between the first average image data and the second average image data can be set in advance, and the exposure amount can be determined using the function.

In the above invention, the image data can be generated for the pixels excluding the pixels corresponding to the high saturation with the average image data in the second storage means as a reference.

[0034]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a photographic printing apparatus to which the present invention can be applied.

A negative carrier 2 which holds a color negative film 20 between a pair of rollers and conveys it in the length direction of the negative film.
A lamp house 10 provided with a mirror box 18 and a halogen lamp is disposed below 1. A light control filter 60 is arranged between the mirror box 18 and the lamp house 10. The dimming filter 60 is a well-known Y (yellow) filter that can enter and leave the optical path,
It is configured to include an M (magenta) filter and a C (cyan) filter.

Above the negative carrier 21, the lens 2
2, a black shutter 24, and a color paper 26 are arranged in this order, and light rays emitted from the lamp house 10 are controlled by the light control filter 60, the mirror box 18, the negative film 20 loaded on the negative carrier 21, and the lens 2.
2 and the original image of the negative film 20 is formed on the color paper 26 by the lens 22.

On the side edge of the negative film 20, a DX code indicating the type of the negative film is recorded by a bar code, and a printable original image of each frame (film frame) in which the original image is recorded. A notch is formed corresponding to each frame (print frame) having a. In order to detect the DX code and notch, the negative carrier 21 is provided with a detector 52 which is arranged so as to sandwich the side edge of the negative film 20 and which is composed of a light emitting element and a light receiving element.

At the position where the density of the original image on the negative film 20 can be measured in the direction inclined with respect to the optical axis of the image forming optical system, the original image on the negative film 20 is divided into a plurality of R images. A scanner 28 including a two-dimensional image sensor provided with a CCD for photometry for each of (red), G (green), and B (blue) is arranged. This scanner 28
Thus, the original image of the frame (print frame) to be printed positioned on the negative carrier 21 can be divided into a large number, and can be spectrally divided into three wavelength bands of RGB for photometry. Note that the scanner 28 may perform photometry with a large number of spectra, and obtain the R, G, and B photometry values by calculation.

The scanner 28 is connected to an exposure amount determining device 32 composed of a personal computer through a photometric data memory 30 which logarithmically converts the photometric value measured by the scanner 28 and stores it for each frame. The photometric value may be logarithmically converted by a personal computer and stored in the photometric data memory 30.

The exposure amount determining device 32 includes the input / output port 3
4. Central processing unit (CPU) 36, read only memory (ROM) 38, random access memory (RAM) 4
0, and a bus including a data bus and a control bus for connecting them, and the like. This ROM
In 38, an exposure amount control routine described below is stored.

The input / output port 3 of the exposure amount determining device 32
Reference numeral 4 is connected to the photometric data memory 30 so as to control the writing and reading timings, and is also connected to the scanner 28 so as to control the photometric timings.

The input / output port 34 is connected to the drive circuit 48.
Is connected to a motor for driving the roller pair of the negative carrier 21 via a drive circuit 50, and is connected to a drive unit of the light control filter 60 via a drive circuit 50 and a drive unit of the black shutter 24 via a drive circuit 54. There is. The input / output port 34 also has a keyboard 44, a detector 52 and a C
RT46 is connected.

Next, the exposure control routine of the first embodiment will be described with reference to FIG.
Will be described with reference to. When the negative film 20 is loaded in the negative carrier 21 and the start switch is turned on, the negative film is conveyed in the first direction along the length direction of the negative film by driving the negative carrier 21 in step 102. The first frame is set at the print position (printing position) in step 104 by detecting the notch with the detector. When the negative film is conveyed in the first direction, the conveyance may be started from the front end of the negative film or the rear end of the negative film. Alternatively, the edge of the frame may be detected and the frame may be set at the print position.

In step 106, the original image of the frame set at the print position is divided into a large number of pixels by the scanner 28, and photometry is performed for each of the three colors R, G, B for each pixel, and in step 108 all the photometric values are measured. The set (photometric value for all pixels) is logarithmically converted, and the logarithmic converted value of the photometric value is stored in the photometric data memory 30 for each frame as a set of photometric data. When storing in the photometric data memory 30, the photometric data R, G, B of the frame are stored according to a predetermined arrangement. In this case, the R, G, and B photometric data may be stored as they are, or may be stored after being compressed in order to reduce the memory capacity. As a result, the photometric data memory 30 stores a set of photometric data R, G, B for each frame.

At the next step 110, the number of photometric frames is counted, and at step 112, it is judged from the count value whether or not the photometry of one negative film is completed. If the photometry of one negative film has not been completed, the process returns to step 102 and the negative film is conveyed by one frame in the first direction as described above, and photometry and storage of a set of photometry data are repeated. As a result, in the memory, a set of photometric data for each of the three colors R, G, and B for one negative film is set for each frame, that is, at least a set of photometric data for the original images of all frames to be copied is stored. Remembered.

In step 114, a plurality of frames for calculating the first average image data of a plurality of original images including the original image of the frame to be printed are selected based on the set of photometric data, and selected in step 116. The set of photometric data of the selected frame is read from the memory, and the first average image data is calculated in step 118.

The first average image data is one color density (for example, G density) or three color average density ((R + G +
Each average color density or each average color density difference (for example, RG, GB) obtained from a set of photometric data of a plurality of original images including the original image of the frame to be printed for B) / 3)
Can be adopted. Further, a function formula or a table value created from a set of photometric data may be used.

The first average image data of a plurality of original images including the original image of the frame to be printed (print frame) is selected from all the frames of one film, and the plurality of original images of one film are selected. Can be calculated based on a set of photometric data.

However, it is not always necessary to calculate the first average image data from the set of photometric data of all the frames of one film, and it is possible to carry the photometric data in the first direction and store the set of photometric data. When finished, you can determine the total number of frames in one film, so select the number of frames according to the total number of frames in one film,
For example, if the number of frames is 36, either one of the two frames may be selected and the first average image data may be calculated.

When it is judged that the frame is largely deviated from the first average image data of one film, the photometric data set of the deviated frame is not used for the calculation of the first average image data. Frame selection, such as
That is, a set of photometric data may be selected. Furthermore, even if the data is excluded from the copy target based on the analysis result of the photometric data of the frame, it may be used for the calculation of the first average image data according to the selection result of the frame.

As the first average image data calculated in step 118, a set of photometric data of original images of a large number of frames of a large number of films for each film type or image data obtained from the set of photometric data is stored in advance. Alternatively, it may be obtained from the stored image data. Further, this image data may be stored in advance and read. In this case, a value obtained from the set of photometric data or the density value, for example, the density of one color (for example, G density)
Alternatively, the color characteristics for the three-color average density ((R + G + B) / 3) can be adopted as the image data. This color characteristic includes each average color density obtained from a set of photometric data of a plurality of original images or each average color density difference (for example, R-G,
GB) can be adopted. Furthermore, a functional expression or table value created from a set of photometric data may be used as image data.

In the next step 120, standardization conditions for standardizing the set of photometric data are determined as described later.

In the next step 122, the negative film is conveyed in the second direction opposite to the first direction without removing the negative film from the negative carrier, the notch is detected, and the first frame is detected in step 124. Set it at the print position. When the final frame is positioned at the print position of the negative carrier, the conveyance in the second direction is unnecessary.

In the next step 126, the set of photometric data of the set frame is read from the memory, and in step 128 the set of photometric data is standardized as follows according to the standardization conditions determined in step 120. First, a set of three-color corrected photometric data is calculated by subtracting the low-density area photometric data from each of a large number of three-color photometric data sets. As the low-density portion photometric data, the photometric data of the base portion of the film including the reference negative film and the film frame can be used. Next, using a predetermined standardization curve (or standardization table) as shown in FIG. 6, the set of the corrected photometric data of B and R is converted into the density of G to normalize (normalize). Then, a set of standardized photometric data of B, R, and G is obtained. Standardizing the photometric data in this way means that negative film has different film densities due to differences in film type and development process. The photometric data is converted so that the density and the color are constant regardless of the kind of seed and the difference in development processing. In addition to the above, standardization methods include Japanese Patent Laid-Open Nos. 56-1039, 61-273532, and 62-1.
The method described in Japanese Patent No. 44158 can be used.

In the next step 130, a pixel is selected, and the image feature amount is calculated from the pixel selected in step 132. As the image feature amount, the maximum density, the minimum density, the average density of the entire surface of the original image or the specific area, the average density of the human face area, and the like can be used. This pixel selection is
This corresponds to extraction of effective image data (effective image data) of the original image to be printed.

In selecting a pixel, first, referring to FIG.
As shown in FIG. 5, the color area is defined on the color coordinates with the horizontal axis representing the difference R−G between the standardized data R and G and the vertical axis representing the difference GB between the standardized data G and B, and including the origin. A, color area A
Other than the color regions of the predetermined color difference range B, the color region A,
The three-color standardized data is classified by determining to which color area of the color area C other than B the three-color standardized data belongs, and the photometric data is classified according to the classification of the three-color standardized data, that is, pixels. Classify.

The set of three-color standardized data is classified into three with the boundary between the color area A and the color area B and the boundary between the color area B and the color area C as the boundary, and therefore three colors are set. A set of standardized data belongs to a color area having a small color difference from the reference value (origin), data belonging to a color area having a medium color difference from the reference value, and a color area having a large color difference from the reference value. Classified as data. In the present embodiment, in step 130, the photometric data whose standardized data belongs to each of the color regions A, B, and C, that is, pixels, is classified and selected as the photometric data used in the subsequent processing. Further, in step 132, the average density for each color (R, G, B) of the entire surface of the original image or the specific region is obtained, and the number of photometric data (pixels) belonging to each color region selected by classification is obtained. The integrated density value of the photometric data belonging to each color area is calculated.

As the technique for selecting the pixel and calculating the image feature amount as described above, the techniques described in JP-A-61-198144 and JP-A-61-232442 can be used.

At the next step 142, step 118
Using the first average image data obtained in step 1 and the image feature amount (average density for each color) obtained in step 132, the following equation (2) is referenced to determine whether the frame is abnormal. The image determination amount ΔRGB is obtained, and it is determined whether or not the print frame is an abnormal frame depending on whether or not the image determination amount ΔRGB is a predetermined value (0.10 in this embodiment).

ΔRGB = {(Ra-Ga) ² + (Ga-Ba) ² }-{(Rm-Gm) ² + (Gm-Bm) ² } or ΔRGB = {| Ra-Ga | + | Ga -Ba |}-{| Rm-Gm | + | Gm-Bm |} (2) However, Ra, Ga, Ba: average image data Rm, Gm, Bm: original image of many frames Image data of the original image (image feature amount)

Based on the determination result of step 142, the coefficient k of the exposure calculation formula (3) shown below is calculated in the next step 144.
The exposure calculation formula is determined by determining 1, k2 and k3.

D = (k1 * SDA + k2 * SDB + k3 * SDC) / (k1 * NA + k2 * NB + k3 * NC) (3) where D: density SDA: integrated density value SDB of pixels included in area Aa : Integrated density value of pixels included in area Ab SDC: integrated density value of pixels included in area Ac NA: number of pixels included in area Aa NB: number of pixels included in area Ab NC: included in area Ac Number of pixels

For example, the above coefficient is ΔRGB <0.10
In the case of, k1 = 10, k2 = 10, k3 = 0, and in the case of ΔRGB ≧ 0.10, k1 = 10, k
It is determined that 2 = 10 and k3 = 10.

Then, the exposure amount is determined by the density value obtained from the exposure calculation formula using the coefficient determined in the next step 134, and the dimming filter 60 is controlled according to the exposure amount determined in step 136 to perform the exposure. Create a print. In step 138, it is determined whether or not the exposure for one film has been completed. If the exposure for one film has not been completed, the process returns to step 122 and the above processing is repeated. On the other hand, when the exposure for one film is completed, the first average image data and the photometric data stored in the photometric data memory 30 for performing the exposure process for the next film in step 140 are erased. To do.

In this way, the image determination amount is ΔRGB <
In the case of 0.10, it is determined that the frame is not an abnormal frame, and the pixels with high saturation are not used for determining the exposure amount, so that color ferria can be prevented. On the other hand, ΔRGB ≧
In the case of 0.10, it is determined that the frame is abnormal, and the pixels with high saturation are also used for determining the exposure amount, so that the color change of the original image contained in the film deteriorated with time and the shooting other than daylight The exposure amount can be determined so as to correct the color change of the original image contained in the film due to the light source and the color change of the original image contained in the film due to the characteristic variation.

The degree of color correction can be changed by changing the values of the coefficients k1, k2 and k3 determined above.

In the above description, the case where the color regions are classified into three types on the color coordinates when selecting pixels has been described, but it is needless to say that the color regions may be further subdivided. For example,
As shown in FIG. 8, the color region is further subdivided on the color coordinates shown in FIG. 7 by straight lines L1, L2, L3, and L4 whose origin is the viewpoint. That is, the color area A in FIG.
2, A3, A4, the color area B to the color areas B1, B2, B
3 and B4, the color area C is replaced by the color areas C1, C2, C3 and C4.
Then, the color area D is subdivided into color areas D1, D2, D3 and D4. The three-color standardized data is classified by determining which color area the three-color standardized data belongs to,
The photometric data is classified (pixels are classified) according to the classification of the three-color standardized data. By doing this,
It is easy to distinguish the vivid color of the subject that causes a color faria from the color deviation due to the change of the shooting light source color or the characteristics of the film, and even if the image determination amount is ΔRGB ≧ 0. And yellow pixels can be excluded from the pixels for conditionally determining the exposure amount, and high-quality prints can be obtained even for red or yellow subjects even if they are determined as abnormal frames. You can

The determination of the exposure amount is not limited to the above, and the following equation (4) may be used.

Di = Dpi−Dni Dw = (ΣDi) / 3 logEi = Si · {Ci (Di−Dw) + Dw} (4) where Dpi: image density of original image of print frame Dni: reference film Image density of the original image of C i: color correction coefficient Si: slope control value (under slope coefficient when Di <0, over slope coefficient is used when Di ≧ 0) Ei: exposure amount i: any of R, G, and B One color

As the image density, for example, the average density of the entire screen, the maximum neutral color density in the image, or the like can be used.
In the above, if ΔRGB <0.10, Ci = 0.6
(Normal collection value), and ΔRGB ≧ 0.
In the case of 10, it is determined that Ci = 1.0 (high correction value).

Further, the following equation (5) may be used instead of the above equation (4). Di = Dpi-Dni Dpi = Ka * D0 + Kb * D1 Dw = (ΣDi) / 3 logEi = Si * {Ci (Di-Dw) + Dw} + Cb (5) However, Dpi: exposure of the original image of the print frame Density (Density for obtaining copy exposure amount) Dni: Image density of original image of reference film Ci: Color correction coefficient Si: Slope control value (under slope coefficient when Di <0, over slope coefficient when Di ≧ 0 is used ) Ei: exposure amount i: any one color of R, G, B Ka, Kb: coefficient (for example, 0.5 for each) D0: image data of original image of print frame D1: data stored in memory Cb : Constant The image density is determined in the same manner as above.

The coefficients k1, k2, k3 are determined according to the color characteristics in the original image, but the coefficients Ka, Kb are determined as follows according to the value of the image discrimination amount.

When ΔRGB> 0.14, Ka = 0.9, Kb = 0.1 0.14 ≧ ΔRGB> 0.10, Ka = 0.7, Kb = 0.3 0.10 When ≧ ΔRGB, Ka = 0.5, Kb = 0.5 As the values of the coefficients Ka and Kb, a function may be set in advance for the image discrimination amount ΔRGB, and the values obtained from this function may be used. .

Further, the coefficients Ka and Kb may be determined according to the color characteristics in the original image (for example, the number of pixels NA, NB, NC, etc.). For example, when the image discrimination amount is ΔRGB> 0.14 and the number of pixels in the tungsten color region is large, it is determined that the image is captured by the tungsten light source, and the coefficient for the tungsten light source prepared in advance can be used.

By using this coefficient as an exposure parameter and using a common value for the original image of one or a series of films, it is possible to suppress variations in color and density for one or a series of films, and to keep constant. In addition, it is possible to obtain a good finished print. This exposure parameter may use the same exposure parameter determination method. In this exposure parameter determination method, when the image determination amount ΔRGB is large when the exposure parameter is calculated by a functional expression, a high value for an initial value or a constant in the functional expression is applied to a print frame included in one or a series of films. Common values may be used.

In the above example, the calculation of the first average image data is performed after the negative film is conveyed in the first direction and the photometric data of the original image is stored for each frame, and before the conveyance in the second direction is started. However, irregularly, for example, using the first average image data calculated from the photometric data of the second half of the frame of one negative film, the photometric value of the first half of the film during conveyance in the second direction is used. Various modifications can be adopted, such as adding the first average image data obtained from the first average image data obtained from the photometric data of the second half frame.

In the above embodiment, a set of photometric data is stored for each frame. However, at the time of photometry, image data representing the characteristics of the original image regarding the color characteristics and the densities described above is extracted from the set of photometric data. It may be generated and the generated image data may be stored for each frame. Alternatively, the color of the pixel may be obtained, and the pixel classified on the color coordinates (FIG. 7 or the like) with respect to the obtained color may be selected and stored.

As described above, in the present embodiment, when it is determined from the image determination amount that the image is not an abnormal frame, pixels with high saturation are not used for determining the exposure amount, so that color ferria can be prevented and abnormalities can be prevented. When it is determined that the frame is a frame, high-saturation pixels are also used to determine the exposure amount, so that the color of the original image included in the film deteriorated over time is included in the film caused by a photographing light source other than daylight. The exposure amount can be determined so as to correct the color change of the original image and the color change of the original image contained in the film due to the characteristic variation.

Next, a second embodiment will be described with reference to the exposure control routine of FIG. In this embodiment, the second average image data which is the average image data of the original images of a large number of films, and the first average which is the average image data of the original images of the print frames included in one or a series of films. The exposure calculation formula is determined from the image data. Since this embodiment has substantially the same configuration as that of the above embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. In the photometric data memory 30 of this embodiment, the first average image data for storing the first average image data described below is stored.
A memory and a second for storing the second average image data
And a memory. For the first memory and the second memory, areas for dividing and using the inside of the photometric data memory 30 may be set in advance according to the application and corresponded. Thus, by setting, it is possible to have a plurality of storage functions in one memory. Also, the first memory and the second memory may be added as separate configurations.

At step 106, the entire set of photometric values (photometric values for all pixels) of the original photometric image is logarithmically converted at step 150, and the logarithmically converted value of the photometric value (that is, the density value) is converted to photometric data. Calculate as a set.
In the next step 152, standardization conditions for standardizing the set of photometric data are determined in the same manner as in step 120 above, and in the next step 154, the set of photometric data is standardized in accordance with the standardization conditions as in step 128 above. Turn into. This step 154 corresponds to the color determination of each pixel. In the next step 156, a predetermined high saturation pixel to be removed is selected and removed from the standardized photometric data set, and the density value of pixels other than the pixel removed in the next step 158, that is, The set of photometric data is stored in the first memory in the photometric data memory 30. Therefore, the first memory stores the density values of the pixels excluding the pixels of high saturation. In the next step 160, the integrated density value and the number of pixels used in the above exposure calculation formula (3) are calculated,
The integrated density value and the number of pixels obtained in the next step 162 are stored in the photometric data memory 30 for each frame. In step 112, it is determined whether or not the photometry of one negative film has been completed. If the photometry of one negative film has not been completed, the process returns to step 102. As a result, the memory stores the density values of pixels excluding high-saturation pixels from the set of photometric data of the original image contained in one negative film, and the integrated density value and the number of pixels for all frames are set, That is, at least all the frames to be copied are stored.

In step 164, at least the set of photometric data of all the frames to be copied stored in the first memory is stored in the second memory. When the data is stored in the second memory, it is preferable to store it as one line of data so that it can be discriminated. By storing in a discriminable manner as described above, a large number of data of a plurality of films or a series of films can be selectively used in the second memory.

In the next step 166, based on the set of photometric data stored in the first memory, the first of the plurality of original images including the original image of the frame to be printed is first extracted as in steps 114 to 118. Select a plurality of frames for calculating the average image data, and calculate the first average image data. In the next step 168,
Second average image data is calculated based on the set of photometric data for the multiple films stored in the second memory. In this calculation, the average image data of all the films stored in the second memory may be used as the second average image data. Alternatively, the average image data for each film stored in the second memory may be obtained, and the obtained plurality of average image data may be used as the second average image data. Furthermore, the second
The average image data for each film stored in the memory is obtained, the average image data of the film group classified in the range of the predetermined average image data is further obtained, and the plurality of average image data may be used as the second average image data. Good.

In the next step 170, the film to be printed is an abnormal film based on the obtained first average image data and second average image data in the same manner as the determination of the abnormal frame in step 142. Determine if there is. That is, using the first average image data obtained in step 166 and the first average image data obtained in step 168, the equation (2) is referred to and the image determination amount Δ
RGB is obtained, and this image determination amount ΔRGB is a predetermined value (0.
10) Whether or not the film is an abnormal film is determined depending on whether or not the above is true. As described above, when there are a plurality of second average image data, the image determination amount ΔRGB may be sequentially obtained, and the minimum image determination amount ΔRGB may be determined. By doing so, the second average image data of similar film groups can be used, and the abnormal film can be determined by the second average image data of the most similar characteristics regardless of the film type.

According to the result of this judgment, in the next step 172, the coefficients k1, k2, k3 of the exposure calculation formula (3) or the coefficients k1, k2, k3, Ka of the exposure calculation formula (5) are calculated in the same manner as in step 144. , Kb to determine the exposure calculation formula.

Next, the negative film is conveyed and the frame is set at the print position (steps 122 and 124), and in the next step 174, the integrated density value and the number of pixels of the frame (print frame) are read from the memory and the determined coefficient is determined. The exposure is performed by controlling the light control filter 60 according to the exposure amount by the density value obtained from the exposure calculation formula (steps 134 and 136).

In this embodiment, the reference value may be stored in advance for each film type and read out. In this case, the second average image data is each reference value for each film type. The reference value and the first image data are sequentially compared to determine the abnormal film. By doing so, the second average image data of similar film types can be used, and there is no need for a film type such as a DX code.

As described above, in this embodiment, the first average image data obtained from the stable second average image data and the original image of the film to be printed are influenced by the subject type of one film.
The abnormal film is determined from the average image data of.
For this reason, the negative film deteriorated with time, which has changed its film properties during film storage such as expiration, latent image regression, long-term storage at high temperature or high humidity, and radiation fog, is accurately determined as an abnormal film different from many film properties. be able to. In addition, film characteristics such as color temperature changes of photographing light sources other than daylight and photographing light sources such as winter days and shades, milk numbers (lot numbers), lot variations, manufacturing variations, and development processing variations are many film characteristics. Different films can be accurately determined as abnormal films.

Therefore, it is possible to prevent color ferria without using pixels with high saturation for determining the exposure amount when the film is not an abnormal film, and determine the exposure amount for pixels with high saturation when the film is abnormal. By using, the color change of the original image contained in the film deteriorated with time, the color change of the original image contained in the film caused by the photographing light source other than daylight, the original image contained in the film caused by the characteristic variation The exposure amount can be determined so as to correct the change in the color.

Further, even for a negative film that is slightly deteriorated with time or a film whose film characteristics are different from many films, an intermediate value between a normal film and an abnormal film can be adopted, and a good color correction value can be determined. be able to. As a result, a good exposure amount can be determined for all films, and high quality prints can be created.

Furthermore, high-quality prints can be produced with uniform print quality within one film, within a series of films, or between films.

Further, in the present embodiment, the first average image data excludes the pixels corresponding to the highly saturated subject.
The first average image data can be obtained with high accuracy even in a negative film including many biased subjects. As a result, the exposure amount can be determined with high accuracy, and high-quality prints can be created.

Next, a third embodiment will be described with reference to the exposure control routine of FIG. In this embodiment, the second average image data, which is the average image data of the original images of a large number of the same film type, and the first image data, which is the average image data of the original images of the print frames included in one or a series of films, are used. The exposure calculation formula is determined from the average image data of.
Since this embodiment has substantially the same configuration as that of the above embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. In the second memory of this embodiment, average image data of a large number of original images is stored in advance for each same film type.

In FIG. 4, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. When the photometry of one film and the storage of the photometric data set are completed in step 112, the type of the negative film is discriminated based on the DX code detected by the detector 52 in step 180, and in the next step 182, A set of at least photometric data of all frames to be copied stored in one memory is stored in the second memory in association with the film type determined in step 182. Therefore, a large number of data of a plurality of films or a series of films for each film type is stored in the second memory.

In the next step 166, the first average image data is calculated in the same manner as described above, and in the next step 184, the second average image data corresponding to the type of the negative film based on the DX code detected in step 180 is calculated. A set of photometric data for a large number of films stored in the memory is read, and second average image data is calculated based on the read set of photometric data.

As described above, in the present embodiment, whether the film to be printed is an abnormal film or not is determined from the second average image data of a large number of films stored in the second memory corresponding to the type of negative film. Since it is judged,
The abnormal film can be more accurately determined when printing.

Next, the exposure control routine of the fourth embodiment will be described with reference to FIG. The first average image data is
It well reflects variations in film characteristics and differences in shooting light sources. Therefore, in the present embodiment, the standardization condition is determined by the first average image data, and the abnormal film determination (exposure calculation formula determination) is performed by comparing the first average image data with the second average image data. It was designed to be done in.

In the control routine of this embodiment, as shown in FIG. 5, the abnormal frame determination process of steps 142 and 144 of the control routine of FIG. 2 is performed by continuing the process of step 190 to step 196 to step 120. It is designed to be processed.

At step 190, the type of the negative film is judged based on the DX code detected by the detector 52, and at the next step 192, it corresponds to the type of the negative film based on the DX code detected at step 190. A set of photometric data for a large number of films stored in the second memory is read, and second average image data is calculated based on the read set of photometric data.

In the next step 194, step 118
By using the first average image data obtained in step 1 and the second average image data obtained in step 192, it is determined whether the film is an abnormal film or not by referring to the above equation (2). This step 1
In the next step 196, the exposure calculation formula is determined by determining the coefficient of the exposure calculation formula in the same manner as above according to the determination result of 94, and the process proceeds to step 122.

In the comparison of the first average image data and the second average image data in the determination of step 194, the first average image data obtained in step 118 is obtained from the data stored in the first memory. Alternatively, a standardization curve (or standardization table) may be used, and a standardization curve obtained from the data stored in the second memory may be used as the second average image data. By comparing these standardized curves, it is possible to determine whether or not the difference is a value within a predetermined range, and to determine whether or not it is an abnormal film.

As described above, in the present embodiment, even if the film characteristic changes, the pixel selection is performed based on the film characteristic, so the exposure calculation formula determined by the film characteristic itself is the second image. The amount of exposure can be determined using the data, as well as the optimum pixel according to the characteristics of the film to be printed.

In the above embodiment, the data stored in the first memory may be measured by advancing the print frame until the required accuracy is obtained and then returning to the first print frame. As a similar technique, the method described in JP-A-4-159534 can be used. Also,
In the case where the data is accumulated in the first memory while being sequentially printed, the first print frame has only the set of photometric data of the original image. Therefore, it is preferable to multiply the discrimination amount ΔRGB by the comparison value (Krgb) and change the comparison value according to the number of sets of data stored in the first memory. As an example of calculating the comparison value, K
rgb = 0.15- (number of sets) / 10,000 can be adopted. However, the comparison value in this case is Krgb ≧ 0.
It is assumed to be 10. This comparison value may be determined from statistical data of the difference between the data stored in the first memory and the data stored in the second memory. For example, it can be determined using the standard deviation of the histogram of the difference between the data stored in the first memory and the data stored in the second memory.

In each of the above embodiments, the first direction and the second direction
The case where the direction of No. 1 is opposite has been described.
As described in Japanese Laid-Open Patent Publication No. 20761, in the case of an apparatus in which there is a space corresponding to about one film between the photometry unit and the exposure unit, the first direction and the second direction are set to the same direction. May be.

When the present invention is applied with a transparent magnetic layer on the entire surface of a negative film and magnetic information is recorded on this magnetic layer, the magnetic recording information is read in the conveying step in the first direction during simultaneous printing. Alternatively, the density correction amount information including manual correction may be stored in the conveying process in the second direction at the time of simultaneous printing, or the color correction amount information may be additionally recorded.

When the information is recorded in this way, in the case of a reorder, the correction amount information recorded on the film in the transporting process in the first direction is read and the presence or absence of the correction amount is determined.
If the correction amount information is recorded, the correction amount information is arranged so that the recorded correction amount information corresponds to each frame, and photometry is performed, and the basic exposure amount is measured in the conveying process in the second direction. Is calculated, the read correction amount is added to determine the exposure amount, and printing is performed based on this exposure amount.
Further, in this case, the exposure amount may be calculated based on the photometric data obtained by scanning, the calculation result and the correction amount may be compared, and the exposure amount or the correction amount may be selected and printed. The manual correction amount or the correction information including the manual correction amount may be stored in the top or last reader of the film.

[0106]

As described above, according to the invention described in claim 1, the exposure calculation formula is determined from the image data of the first storage means and the image data of the second storage means. The exposure amount is determined in consideration of film characteristics such as aging and gray or a constant hue close to gray, and high quality prints can always be obtained regardless of changes in film characteristics such as aging. effective.

According to the invention described in claim 2, since the judging means judges the abnormal film on the basis of each image data stored in the first storing means and the second storing means, it is general. There is an effect that an abnormal film having a characteristic different from that of the film can be easily determined.

According to the third aspect of the present invention, the determining means includes the first average image data stored in the first storage means and the second average image data.
Based on the second average image data by the storage means of
Since the film having the average image data that does not correspond to the average image data of is determined as the abnormal film, it is possible to determine the abnormal film from the standard hue for the film including the original image to be printed. effective.

According to the invention described in claim 4, since the judging means judges the original image having the image data which does not correspond to the general average image data such as the hue obtained by integrating the densities of the three colors. There is an effect that it is possible to easily determine a film having a hue different from a general hue of an original image to be printed.

According to the fifth aspect of the present invention, at least one of the first average image data and the second average image data is used to determine the exposure amount. There is an effect that the exposure amount is determined in consideration of a constant hue close to, and a high-quality print can always be obtained regardless of changes in film characteristics such as deterioration with time.

According to the invention described in claim 6, it is possible to judge an abnormal film from a standard hue of the same film type for a film containing an original image to be printed, and to obtain a higher quality print. There is an effect that you can.

According to the seventh aspect of the invention, the change in the film characteristics is considered by considering the gray hue of the film to be printed or a constant hue close to the gray, or the standard hue of the same film type. The exposure calculation formula can be determined from the first average image data and the second average image data for a large number of frames so as not to be affected, and from the image data of the original image to be printed even if the characteristics of the film change. Since the exposure amount is obtained from the effective image data obtained,
There is an effect that the optimum exposure amount can be determined according to the characteristics of the general or standard film and also the characteristics of the original image to be printed.

Therefore, according to the present invention, a negative film which has deteriorated with time and whose characteristics have changed during storage of the film, such as expiration, latent image regression, long-term storage at high temperature or high humidity, and radiation fog, can be used as a property of many films. Can be accurately determined as a different film. In addition, color temperature changes of shooting light sources other than daylight, and shooting light sources such as winter days and shades,
It is possible to accurately determine a film whose film characteristics such as lots, manufacturing variations, and development processing variations are different from those of many films. Therefore, a good color correction value can be determined, a good exposure amount can be determined for all films, and high quality prints can be produced. In addition, high-quality prints can be produced with uniform print quality within one film, a series of films, or between films. As a result, the excellent effect that high quality prints can always be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing a photographic printing apparatus usable in an embodiment of the present invention.

FIG. 2 is a flow chart showing an exposure amount control routine of the first embodiment of the present invention.

FIG. 3 is a flow chart showing an exposure amount control routine of a second embodiment of the present invention.

FIG. 4 is a flow chart showing an exposure amount control routine of a third embodiment of the present invention.

FIG. 5 is a flow chart showing an exposure amount control routine of a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a standardization table for standardizing photometric data.

FIG. 7 is a diagram showing color coordinates for classifying three-color standardized data.

FIG. 8 is a diagram showing another color coordinate for classifying the three-color standardized data.

[Explanation of symbols]

 20 Film 21 Negative Carrier 28 Scanner

Claims (10)

[Claims] 1. A photometric device for dividing an original image recorded on one film or a series of films into a large number of pixels, and performing photometry by color-separating into at least three primary colors, and based on a photometric value of the original image. An image data generation unit that generates image data representing the characteristics of the original image, a first storage unit that stores the image data, and a number of frames of the image data of the original image stored in the first storage unit. Second storage means for storing a large number of frames of image data, and average image data representing an average value of the image data stored in the second storage means are obtained and stored in the first storage means. An arithmetic expression determining means for determining an exposure arithmetic expression for determining an exposure amount using the image data and the obtained average image data; an exposure amount calculating means for obtaining an exposure amount based on the determined arithmetic expression; A color copying apparatus comprising: an exposure control unit that controls exposure based on the exposure amount obtained by the amount calculation unit. 2. A photometric unit that divides an original image recorded on one film or a series of films into a large number of pixels, and performs photometry by color-separating into at least three primary colors, and based on the photometric value of the original image. An image data generation unit that generates image data representing the characteristics of the original image, a first storage unit that stores the image data, and a number of frames of the image data of the original image stored in the first storage unit. Second storage means for storing a large number of frames of image data, and an abnormal film determination based on the image data stored in the first storage means and the image data stored in the second storage means Determination means, exposure amount calculation means for obtaining the exposure amount of the original image based on the determination result of the determination means, exposure control means for exposure control based on the exposure amount obtained by the exposure amount calculation means, Color copying apparatus equipped. 3. A photometric means for dividing an original image recorded on a single film or a series of films into a large number of pixels and performing color separation by separating into at least three primary colors, and a photometric value of the original image. Image data generating means for generating image data, first storage means for storing image data of a large number of frames included in the film, and image data of a large number of frames over a large number of films of the same film type as the film. And a second storage means for storing, and a first average image data representing an average value of the image data stored in the first storage means, and an average of the image data stored in the second storage means. The second average image data representing the value is obtained, and the second average image data of the first storage means and the obtained average image data of the second storage means are used to calculate the second average image data. Determination means for determining the film having abnormal image data that does not correspond to image data as an abnormal film; exposure amount calculation means for obtaining the exposure amount of the original image based on the determination result of the determination means; and the exposure amount calculation A color copying apparatus comprising: an exposure control unit that controls exposure based on the exposure amount obtained by the unit. 4. A photometric means for dividing an original image stored in a single film or a series of films into a large number of pixels, and performing color separation into at least three primary colors, and photometric means, based on a photometric value of the original image. Image data generating means for generating image data representing the characteristics of the original image, image data for multiple frames included in the film, or image data for multiple frames across multiple films of the same film type as the film. Storage means for storing, determining means for determining average image data representing an average value of the image data stored in the storage means, determining means for determining the original image having image data that does not correspond to the obtained average image data, An exposure amount calculation unit that determines the exposure amount of the original image based on the determination result of the determination unit, and an exposure amount calculation unit that determines the exposure amount calculated by the exposure amount calculation unit. Color copying apparatus having a, exposure control means for controlling exposure have. 5. An original image recorded on one film or a series of films is divided into a large number, and color separation is performed into at least three primary colors to perform photometry, and the original image is determined based on the photometric value of the original image. Image data representing the characteristics of the original image, image data of the original image, first average image data representing an average value of image data of multiple frames included in the film, and multiple images of the same film type as the film. The second which represents the average value of the image data of many frames over the film
Exposure amount determination method for a color copying apparatus, wherein the exposure amount is determined by using a color density difference between at least two data of the average image data. 6. An original image recorded on one film or a series of films is divided into a large number, and color separation is performed into at least three primary colors to perform photometry, and the original image is determined based on a photometric value of the original image. Image data representing the characteristics of the original image, image data of the original image, first average image data representing an average value of image data of multiple frames included in the film, and multiple images of the same film type as the film. The second which represents the average value of the image data of many frames over the film
The original image having non-corresponding image data with the first average image data or the second average image data, and the film having non-corresponding average image data based on at least two of the average image data of Of at least one of the above, and the exposure amount is determined based on the determination result. 7. An original image recorded on one film or a series of films is divided into a large number, and color separation is performed into at least three primary colors to perform photometry, and the original image is determined based on the photometric value of the original image. Image data representative of the characteristics of all original images contained in the film to be printed are stored in the first storage means. Image data for a number of frames over a number of films of the same film type are stored in the second storage means, and first average image data representing an average value of the image data stored in the first storage means, An exposure calculation formula is determined based on the second average image data representing the average value of the image data accumulated in the second storage means, and the first average image data or the second average An exposure amount determining method for a color copying apparatus, in which effective image data of an original image to be printed is obtained based on image data, and an exposure amount is determined based on the exposure calculation formula and the effective image data of the original image to be printed. . 8. The exposure calculation formula common to the film when the first average image data and the second average image data are different from each other by a predetermined value or more. Exposure determination method for color copying machine. 9. A method according to claim 7, wherein a function representing a relationship between the first average image data and the second average image data is predetermined, and the exposure calculation formula is determined using the function. A method for determining an exposure amount of the color copying machine described. 10. The image data is generated for pixels excluding pixels corresponding to high saturation with reference to the second average image data.
The method for determining the exposure amount of the color copying apparatus as described in any one of 1.