JP2000076428A - Aberration correcting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a photographic print of satisfactory image expressing a subject based on obtained image date by picking up the image of the subject with a camera to record the subject image on a photographic film and reading the photographic film to obtain image data expressing the subject image. SOLUTION: When the aberration of the lens of a camera is large and an image pickup center coordinate and a reading center coordinate are coincident with each other or positioned closely in an allowable range (affirmatively judged at a step 302) and trimming processing is not executed or center trimming processing is executed (affirmatively judged at a step 304), a correcting parameter correcting the aberration of the lens of the camera and a compensation parameter correcting the aberration of the less of a scanner are integrated (step 308) to simultaneously correct both of picture deterioration caused by the aberration of the lens of the camera and picture deterioration caused by the aberration of the lens of the scanner through the use of the integrated parameter (step 312).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an aberration correction method, and more particularly, to an image of a subject projected through a first lens, and a subject image recorded on a photographic photosensitive material by the imaging. To an aberration correction method for image data obtained by projecting and reading through a second lens.

[0002]

2. Description of the Related Art Conventionally, a subject is imaged by a camera,
A subject image is recorded on a photographic photosensitive material such as a photographic film (hereinafter simply referred to as a photographic film), the photographic film is read by a scanner to obtain image data representing the subject image, and the subject is obtained based on the obtained image data. Techniques for creating photographic prints representing images are known.

[0003] In the above, the camera records the subject image projected through the lens mounted on the camera on a photographic film. Further, the scanner reads an object image on a photographic film projected through a lens mounted on the scanner.

Generally, since a lens has aberrations, a subject image projected through the lens of the camera or a subject image on a photographic film projected through the lens of the scanner is caused by the aberration of the lens. And the image quality may be degraded. For example, due to lens distortion, FIG.
As shown in FIG. 16A, a barrel-shaped image represented by a solid line is obtained for a lattice-shaped subject represented by a broken line, or a lattice-shaped subject represented by a broken line is represented by a solid line as shown in FIG. Or a pincushion-shaped image. Further, due to the chromatic aberration of magnification of the lens, red or blue color bleeding may occur at the black and white boundary portion of the subject image as shown in FIG.

In particular, as for the lens of the scanner, since the projection magnification from the object to be read (photographic film or the like) to the CCD becomes nearly equal, it is difficult to design a lens with reduced aberration. For this reason, there is a concern that the image quality of the subject image on the photographic film projected through the lens of the scanner may deteriorate.

In addition, in the above technique, there is a possibility that the image quality of a photographic print to be produced is considerably deteriorated due to both the aberration of the camera lens and the aberration of the scanner lens.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. An image of a subject is recorded by a camera, a subject image is recorded on a photographic film, and the photographic film is scanned by a scanner. Provided is an aberration correction method capable of obtaining a photographic print having good image quality when reading and obtaining image data representing a subject image and creating a photographic print representing the subject image based on the obtained image data. With the goal.

[0008]

According to a first aspect of the present invention, there is provided an aberration correction method for imaging an object projected through a first lens by imaging means loaded with a photographic photosensitive material. An image correction method for capturing an image, projecting a subject image recorded on the photographic material by the imaging through a second lens, and reading the image data by an image reading unit. Information about the aberration of the first lens and information about the aberration of the second lens, and read by the image reading unit based on the acquired information about the aberration of the first and second lenses. For the obtained image data representing the subject image, simultaneously correct the deterioration of the image quality of the subject image represented by the image data due to the aberration of the first and second lenses.
It is characterized by the following.

According to a second aspect of the present invention, there is provided an aberration correcting method, wherein an image of a subject projected through a first lens is taken by an image pickup means loaded with a photographic photosensitive material, and the photographic photosensitive material is taken by the imaging. An aberration correction method for projecting the subject image recorded in the second lens through a second lens and reading the image data obtained by the image reading means,
Acquiring information on the aberration of the first lens and information on the aberration of the second lens, determining whether or not the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration; When the amount of aberration of the lens is equal to or larger than a predetermined amount of aberration, the first and second images of the subject image represented by the image data are compared with the image data based on the information regarding the aberration of the first and second lenses. Deterioration of image quality caused by aberration of the second lens is simultaneously corrected, and when the amount of aberration of the first lens is less than a predetermined amount of aberration, based on information on aberration of the second lens, The image data is used to correct a decrease in image quality of the subject image represented by the image data due to aberration of the second lens.

According to a third aspect of the present invention, there is provided an aberration correction method according to the second aspect.
In the invention described in the above, the amount of aberration of the first lens is determined as a predetermined amount of aberration by determining whether the first lens corresponds to one of lenses having a predetermined large aberration. It is characterized in that it is determined whether or not this is the case.

According to the fourth aspect of the present invention, there is provided an aberration correcting method according to the second aspect.
In the invention described above, an image of a reference subject projected on the photographic material through a first lens is captured, and the reference subject image recorded on the photographic photosensitive material by the imaging is captured via a second lens. And determining whether the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration based on image data obtained by projection and reading by the image reading unit.

According to a fifth aspect of the present invention, there is provided an aberration correction method according to the second aspect.
In the described invention, optical property information of the first lens is obtained, and the first lens is obtained based on the obtained optical property information.
It is characterized in that it is determined whether or not the amount of aberration of the lens is equal to or greater than a predetermined amount of aberration.

According to the sixth aspect of the present invention, there is provided an aberration correcting method.
6. The invention according to claim 5, wherein the information on the aberration of the lens is information representing the aberration of the lens, a correction parameter for correcting the aberration of the lens,
And information indicating the type of the imaging means.

In the aberration correcting method according to the seventh aspect,
In the invention according to any one of claims 1 to 6, the information on the aberration of the second lens is an image of a predetermined test image projected through the second lens. The distortion of the image of the test image caused by the aberration of the second lens is detected based on the image data obtained by the reading by the image reading unit, and the detected distortion of the image of the test image is detected. It is characterized by obtaining from.

According to the first aspect of the present invention, there is provided an aberration correction method for an object projected through a first lens by an image pickup means loaded with a photographic photosensitive material such as a photographic film (hereinafter simply referred to as a photographic film). This is an aberration correction method for capturing an image, projecting a subject image recorded on a photographic film by the capturing through a second lens, and reading the image data by an image reading unit.

In this aberration correction method, first, information on the aberration of the first lens and information on the aberration of the second lens are obtained.

Here, for example, for each of the first and second lenses, information relating to aberrations of various lenses is stored in advance for each lens identification information, and the identification information of the target lens is obtained. Information about the aberration of the lens corresponding to the information may be obtained, or information about the aberration of the target lens may be directly obtained.

The information relating to the lens aberration may be information representing the lens aberration or a correction parameter for correcting the lens aberration. Further, as the image reading means, an optical reading device such as a scanner for reading a subject image projected through a second lens by a line CCD sensor or an area CCD sensor can be employed.

Next, based on the acquired information on the aberrations of the first and second lenses, the image data representing the subject image obtained by reading by the image reading means is compared with the subject image represented by the image data. The image quality degradation caused by the aberrations of the first and second lenses is simultaneously corrected.

In this case, for example, when information indicating lens aberration is acquired as information on lens aberration for each of the first and second lenses, the image quality of the subject image generated due to the aberration is obtained. Of the correction for the first lens and the correction parameter for the second lens are integrated to obtain the first and the second parameters of the subject image represented by the image data. A correction parameter for simultaneous correction for simultaneously correcting deterioration in image quality due to aberration of the second lens is obtained.

In the case where the correction parameter for correcting the lens aberration is acquired as the information on the lens aberration for each of the first and second lenses, the first acquired lens is similarly acquired as described above. In order to simultaneously correct the deterioration of the image quality caused by the aberrations of the first and second lenses of the subject image represented by the image data by integrating the correction parameters for the second lens and the correction parameters for the second lens. The correction parameter for the simultaneous correction of is obtained.

The image data obtained by the reading by the image reading means is corrected in accordance with the obtained correction parameters for simultaneous correction.

In this way, it is possible to efficiently correct the deterioration of the image quality caused by the aberration of the first and second lenses of the subject image represented by the image data obtained by the reading by the image reading means.

In addition, good image quality can be obtained even when an image pickup means having an inexpensive lens and an image reading means (scanner or the like) having an inexpensive lens are used.

By the way, the first lens for projecting an image of a subject at the time of image pickup is usually mounted on an image pickup means such as a camera. However, when a single-lens reflex camera is used as the image pickup means, for example, the first lens is mounted on the image pickup means. Does not require any particular aberration correction. Further, when an inexpensive camera such as a film with a lens is used as the imaging means, aberration correction is necessary because the lens mounted on the camera has a large aberration. As described above, the first lens has a large and small aberration depending on the type. When the aberration of the lens is small, the aberration correction is not necessarily required.

Therefore, in the aberration correcting method according to the second aspect, first, information on the aberration of the first lens and information on the aberration of the second lens are obtained, as in the first aspect of the present invention. It is determined whether the amount of aberration of the first lens (a lens that projects an image of a subject at the time of imaging) is equal to or greater than a predetermined amount of aberration.

Here, it is determined whether the first lens corresponds to one of the lenses having a predetermined large aberration, thereby determining the aberration of the first lens. It may be determined whether the amount is equal to or larger than a predetermined aberration amount. Further, as in claim 4, an image of a reference subject projected onto the photographic photosensitive material via a first lens is captured, and a subject image recorded on the photographic photosensitive material by the imaging is captured in a second image. It may be determined whether or not the amount of aberration of the first lens is equal to or larger than a predetermined amount of aberration based on image data obtained by projecting through the lens and reading by the image reading unit. Further, as in claim 5, the first
The optical characteristic information of the first lens may be acquired, and it may be determined based on the acquired optical characteristic information whether the aberration amount of the first lens is equal to or larger than a predetermined aberration amount.

Here, if the amount of aberration of the first lens is equal to or less than a predetermined amount of aberration, an image based on the information on the aberration of the first and second lenses is obtained in the same manner as in the first aspect of the present invention. The image data is simultaneously corrected for image quality degradation caused by aberrations of the first and second lenses of the subject image represented by the image data.

On the other hand, if the amount of aberration of the first lens is smaller than the predetermined amount of aberration, the second lens of the subject image represented by the image data is compared with the image data based on the information on the aberration of the second lens. Of the image quality caused by the aberration of the lens is corrected. That is, only the aberration of the second lens is corrected.

As described above, only when the amount of aberration of the first lens is equal to or larger than the predetermined amount of aberration, the aberration of the first and second lenses is simultaneously corrected.
Aberration correction can be appropriately performed according to the magnitude of aberration of the lens.

The information on the aberrations of the lenses (first and second lenses) includes information indicating the aberration of the lens, correction parameters for correcting the aberration of the lens, and information indicating the type of the imaging means. Either.

According to the seventh aspect of the present invention, information on the aberration of the second lens is obtained as follows. That is, the image of the predetermined test image projected through the second lens is read by the image reading means. Note that an image in which a plurality of straight lines are drawn in a plurality of predetermined directions, such as a grid chart, can be used as the test image.

Next, based on the image data obtained by the above reading, the distortion of the image of the test image due to the aberration of the second lens is detected. In addition, this "image distortion" does not mean the image distortion caused by the lens distortion, but means the image distortion caused by the entire lens aberration including not only the distortion but also the spherical aberration and the chromatic aberration of magnification. are doing. The same applies to “image distortion” below.

For example, image data obtained by reading and image data of a predetermined test image are developed in the same two-dimensional coordinate system by image processing, and a shift between the images developed in the two-dimensional coordinate system is performed. , The distortion of the image of the test image due to the aberration of the second lens can be detected. Then, information on the aberration of the second lens is obtained from the detected image distortion of the test image. In this manner, information on the aberration of the second lens can be easily obtained.

[0035]

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

(Schematic Configuration of Digital Lab System) FIGS. 1 and 2 show a schematic configuration of a digital laboratory system 10 according to the present embodiment.

As shown in FIG. 1, the digital lab system 10 includes a line CCD scanner 14, an image processing section 16, a laser printer section 18, and a processor section 20. The processing unit 16 is integrated as the input unit 26 shown in FIG.
Are integrated as an output unit 28 shown in FIG.

The line CCD scanner 14 is for reading a frame image recorded on a photographic film such as a negative film or a reversal film.
5 size photographic film, 110 size photographic film, and photographic film with a transparent magnetic layer (24
0 size photographic film: so-called APS film), 12
Frame images of photographic film of size 0 and size 220 (Brownie size) can be read. In the line CCD scanner 14, the light emitted from the light source 66 is diffused by the light diffusion plate 72 and is applied to the frame image of the photographic film 68 on the film carrier 74. The light transmitted through the frame image enters the lens unit 76,
The lens unit 76 forms an image of the transmitted light on the light receiving surface of the line CCD 30. The frame image formed here is read by the line CCD 30, and the image data obtained by this reading is A / D converted by the A / D converter 32.
After the conversion, it is output to the image processing unit 16. The photographic film to be read is inserted from the film insertion slot 99 in FIG. 2, and each frame image of the photographic film is sequentially positioned at a reading position by the line CCD 30 by a transport mechanism (not shown).

The image processing section 16 stores image data (scanned image data) output from the line CCD scanner 14.
Is input, and image data obtained by imaging with the digital camera 34 or the like, a document (for example, a reflection document, etc.)
Data obtained by reading the image data with a scanner 36 (flat bed type), image data generated by another computer and recorded in a floppy disk drive 38, MO drive or CD drive 40, and received via a modem 42 The communication image data and the like (hereinafter, these are collectively referred to as file image data) can be externally input.

The image processing unit 16 will be described in detail later. The image processing unit 16 performs various kinds of image processing such as color balance adjustment, contrast adjustment, distortion correction, and magnification chromatic aberration correction on the input image data. The processing is performed, and the image data after the image processing is output to the laser printer unit 18 as recording image data. Further, the image processing unit 16 outputs the image data subjected to the image processing to an external device as an image file (for example, outputs the image data to a storage medium such as an FD, an MO, a CD, or to another information processing device via a communication line). Transmission, etc.).

The laser printer section 18 has R, G, and B laser light sources 52, and controls a laser driver 54 to record image data (temporarily stored in an image memory 56) input from the image processing section 16. Is applied to the photographic printing paper, and scanning exposure (in the present embodiment, mainly the polygon mirror 58 and the fθ lens 60) is performed.
An image is recorded on the photographic paper 62 by an optical system using the same. Further, the processor unit 20 includes a laser printer unit 18.
The photographic paper 62 on which an image has been recorded by scanning exposure is subjected to color development, bleach-fixing, washing, and drying.
Thus, an image is formed on the printing paper.

(Configuration of Image Processing Unit) Next, the configuration of the image processing unit 16 will be described with reference to FIG. As shown in FIG.
The image processing unit 16 performs color balance adjustment, contrast adjustment (color gradation processing), darkness correction, defective pixel correction, shading correction, and trimming processing based on a trimming instruction on image data input from the line CCD scanner 14 or the like. And the like, the aberration of a lens (hereinafter, referred to as an imaging lens) 162 of a camera 160 (see FIG. 12) used for imaging, and the lens unit of the line CCD scanner 14 shown in FIG. A first aberration correction unit 88 and a second aberration correction unit 92 that correct the image quality deterioration caused by the aberration of the scanning lens 76
A switching unit 90 for switching between inputting the output data from the first aberration correction unit 88 to the second aberration correction unit 92 and outputting the data to the outside of the image processing unit 16 (the monitor 16M or the laser printer unit 18). A storage unit 84 for storing image data, lens aberration information to be described later, and the like; and a correction parameter calculating unit for calculating aberration correction parameters based on lens aberration information, image center coordinate information to be described later, and image resolution information. 80, an aberration calculation unit 86 that calculates aberration for a scanning lens whose aberration is unknown, and an image interpolation calculation unit 94 that performs an interpolation calculation described later on the image data.

The storage unit 84 is composed of a non-volatile memory such as a hard disk. The storage unit 84 stores, in addition to the image data, aberration information of the imaging lens for each lens identification data. Are stored in advance for each lens identification data and each scanning magnification. Further, in the storage unit 84, image data (reference image data used for calculating the aberration of the scanning lens described later) representing the grid chart 150 recorded on the film 152S shown in FIG. 10 is stored in advance.

In FIG. 3, in order to make it easy to understand the input and output of various data and information, the storage unit 84 is stored in the storage unit 84A,
Although described separately for 84B and 84C, the storage unit 84 may be actually configured by one storage device (for example, a hard disk) or may be configured by a plurality of storage devices.

In the present embodiment, an imaging device (camera)
In the following, an example in which the lens-equipped film 160 of FIG. 12 is employed will be described. The latent image barcode 156 is recorded on the film 152 in advance. Accordingly, the operator visualizes the barcode 156 by developing the film 152, reads the barcode 156 with the barcode reader 98 in FIG.
The obtained lens identification data of the imaging lens 162 is input to the correction parameter calculation unit 80.

In this embodiment, the image of the subject based on the input image data is displayed on the monitor 16M as shown in FIG. 13, and the image area that the operator wants to capture in the photo print is displayed on the displayed image 190. , And the pre-processing unit 82 can extract image data representing an image in the specified image area from the input image data. So-called trimming processing is possible.

More specifically, the operator designates a first reference point 192A and a second reference point 192B in order with a mouse, and instructs the execution of the trimming process by a predetermined operation, whereby the reference points 192A and 192B are designated. The image data representing the image in the rectangular image area 192 having the diagonal vertex is extracted. At this time, the first and second reference points 192A correspond to each other so that the aspect ratio of the image area 192 becomes an aspect ratio corresponding to the designated print size (for example, any of the L size, the panorama size, and the high definition size). The position of the second reference point 192B may be limited.

(Configuration of Aberration Correcting Unit) Next, the configuration of the first aberration correcting unit 88 and the second aberration correcting unit 92 (hereinafter, these are collectively referred to as an aberration correcting unit) will be described with reference to FIG. . The configuration of the aberration correction units 88 and 92 is the same as the configuration shown in FIG.

As shown in FIG. 4, the aberration corrector 88 (9
2) includes a subtractor 102, a distortion correction unit 104 for correcting lens distortion, an R magnification chromatic aberration correction unit 106 for correcting R magnification chromatic aberration based on G color,
B-magnification chromatic aberration corrector 108 for correcting B-magnification chromatic aberration based on G-color, and adders 110, 112, and 114
Are provided.

The input image data is represented by an XY coordinate system as shown in FIG. 14A, while the aberration correction information of the imaging lens 162 is based on the imaging center S () shown in FIG. X0, Y0) is represented by a two-dimensional coordinate system (hereinafter, referred to as an imaging lens aberration correction coordinate system) having an origin, so that the image data inputted before the aberration of the imaging lens 162 is corrected. Needs to be converted into data of the imaging lens aberration correcting coordinate system.

The aberration correction information of the scanning lens 76 is
Since it is expressed in a two-dimensional coordinate system (hereinafter, referred to as a scanning lens aberration correcting coordinate system) having the origin at the reading center T (X0S, Y0S) shown in FIG. Before performing the correction, it is necessary to convert the input image data into data of a scanning lens aberration correction coordinate system.

Therefore, in the aberration correction unit 88 (92), the subtractor 102 subtracts the center coordinate value (ie, the imaging center coordinate value (X0, Y0)) from the coordinate value (X, Y) of each pixel of the input image data. Alternatively, the reading center coordinate value (X0S, Y0
S)), the coordinate value (X,
Y) is converted into a coordinate value (x, y) of the imaging lens aberration correction coordinate system or the scanning lens aberration correction coordinate system. The image data of each pixel whose coordinate values have been converted is output to the distortion correction unit 104.
And is corrected using the lens distortion correction parameters.

The R color image data (R data) of the image data subjected to the distortion aberration correction is input to the R magnification chromatic aberration correction unit 106, and G is calculated by using the magnification chromatic aberration correction parameter for the R data. R based on color
Correction of chromatic aberration of color is performed. For the B color image data (B data), the B magnification chromatic aberration corrector 10
8, the correction of the chromatic aberration of magnification of the B color based on the G color is performed using the chromatic aberration correction parameter for the B data.

The G color image data (G data) is
Since this serves as a reference for correcting the chromatic aberration of magnification, the chromatic aberration of magnification is input to the adder 112 without being corrected, and the adder 112 adds the center coordinate value to the coordinate value (x, y) of each pixel. Thus, the coordinate value (x, y) of each pixel is calculated as shown in FIG.
(A) is inversely transformed into the coordinate values of the XY coordinate system.

Similarly, the R data after the correction of the chromatic aberration of magnification of the R color is input to the adder 110, and the adder 110 adds the center coordinate value to the coordinate value (x, y) of each pixel. The coordinate value (x, y) of each pixel is represented by X in FIG.
It is inversely transformed into the coordinate value of the Y coordinate system. The B data after the correction of the lateral chromatic aberration of the B color is input to the adder 114,
The center coordinate value is added to the coordinate value (x, y) of each pixel by the adder 114, so that the coordinate value (x, y) of each pixel is obtained.
Is inversely transformed into the coordinate values of the XY coordinate system in FIG.

The image data (RGB data) whose coordinate values have been inversely transformed as described above is output from the aberration corrector 88 (92).

The aberration correction calculation is coordinate conversion in an XY coordinate system as shown in FIG. Output scan address (X,
Y), and the coordinates (X'R, Y'R), (X'G, Y'G), whose coordinates are distorted by aberration,
(X′B, Y′B) is obtained. By interpolating the input image data corresponding to the obtained coordinates by the image interpolation calculation unit 94 shown in FIGS. 3 and 18, output image data in which aberration has been corrected can be obtained.

In each of the distortion aberration corrector 104, the R magnification chromatic aberration corrector 106, and the B magnification chromatic aberration corrector 108 shown in FIG. 4, a calculation is performed to input coordinates having no aberration and to obtain coordinates having aberration.

In the image interpolation calculation unit 94 shown in FIGS.
Known bilinear interpolation and cubic spline interpolation are performed.
When bilinear interpolation is performed, for example, (X ′
The integer part (IX'G, IY'G) of G, Y'G) becomes a reference address, and the image data of four points around it is referred to. The weighting coefficients for interpolation are (X′G, Y′G
) May be given.

When performing scaling processing by electronic scaling, it is desirable to perform the processing in combination with the coordinate transformation described above. For example, if the electronic magnification is N, the coordinates (X′R
, Y'R), (X'G, Y'G), (X'B
, Y′B) by adding (1 / N).

In both the first aberration correction processing and the second aberration correction processing described later, it is desirable that the image interpolation operation be performed at once by the image interpolation operation section 94 as shown in FIG. This is because the interpolation operation involves a reduction in sharpness and the occurrence of artifacts. Therefore, if the interpolation operation is performed twice or more, the image quality is considerably reduced.

(Method of Calculating Aberration of Scanning Lens) Here, a method of calculating the aberration of a scanning lens whose aberration is unknown will be described with reference to the flowchart of FIG. In addition,
For simplicity, FIG. 5 shows a series of procedures including the operation of the operator.

In step 202 of FIG. 5, the operator inserts the film 152S on which the grid chart 150 of FIG. 10 is recorded from the film insertion slot 99 (see FIG. 2), and in the line CCD scanner 14, scans the scanning lens 76.
Is scanned and read by the line CCD 30 through the grid chart 150 projected through the. At this time, it is assumed that reading is performed at a reading magnification corresponding to any one of the film types (APS film / 135 film / Brownie type film).

In the next step 204, image data representing the image of the grid chart 150 obtained by the above reading (hereinafter, referred to as image data).
The read image data) and the lens identification data of the scanning lens 76 are fetched from the line CCD scanner 14 into the aberration calculator 86.

The aberration calculator 86 stores reference image data (hereinafter referred to as reference image data) representing the grid chart 150 stored in advance in the next step 206 in the storage unit 44.
In the next step 208, the read image data and the reference image data are developed on the same virtual two-dimensional coordinate system, and a shift between the two developed images is obtained. The distortion of the image of the chart 150 (the image projected via the scanning lens 76) and the color fringing (here, the shift amounts of the B color and the R color based on the G color) are detected.

In the next step 210, the distortion information of the scanning lens 76 is obtained from the detected image distortion, and the B of the scanning lens 76 is determined from the color blur of the detected image.
The magnification chromatic aberration information of the colors R and R is obtained. Thereby, distortion aberration information and magnification chromatic aberration information of B and R colors corresponding to the reading magnification in step 202 are obtained. Then, in the next step 212, the obtained distortion information and B color,
The magnification chromatic aberration information of the R color is stored in the storage unit 44 in association with the lens identification data and the reading magnification.

Thereafter, returning to step 202, the image of the grid chart 150 is read at a reading magnification corresponding to another film type, and based on the read image data obtained by reading and the reference image data, Distortion aberration information corresponding to the reading magnification and magnification chromatic aberration information of B and R colors are obtained.

As described above, the scanning lens 7 whose aberration is unknown
6 for each film type (APS film / 135
(The film / Brownie type film), distortion aberration information and magnification chromatic aberration information of B color and R color corresponding to the reading magnification corresponding to the reading magnification can be easily obtained, and the obtained distortion information and magnification chromatic aberration of B color and R color can be obtained. The information can be stored in the storage unit 44 in association with the lens identification data and the reading magnification.

(Operation of the present embodiment) Next, as an operation of the present embodiment, an image of the subject projected through the imaging lens 162 is taken, and the subject image recorded on the photographic film 152 by the imaging is taken. A process of performing aberration correction on image data obtained by projecting and reading through the scanning lens 76 will be described with reference to flowcharts of FIGS. Note that each flowchart includes a process performed by a photographer or an operator in order to easily explain the flow of the process. The photographic film 152 is, for example, an APS film.

First, the general flow of the processing will be described with reference to FIG. First, in step 222 in FIG. 6, the photographer images a subject using the film with lens 160 in FIG. Thus, the image of the subject projected via the imaging lens 162 is recorded on the photographic film 152. In the next step 224, the photographer takes the photographed film 15
2 is brought into a photo lab, and the photo lab film 152 is developed by a photo lab operator. Thereby, the photographic film 15
On 2, the bar code 156 representing the image of the subject and the lens identification data of the imaging lens 162 is visualized.

In the next step 226, the operator inserts the photographic film 152 from the film insertion slot 99 in FIG.
The image of the subject projected through the line is scanned and read by the line CCD 30. In the next step 228, although details will be described later, image data representing the image of the subject obtained by the reading is input to the image processing unit 16, and the image processing unit 16 compares the image data with the aberration of the imaging lens 162 and the scanning. Various image processing such as distortion correction for correcting aberration of the lens 76 and chromatic aberration of magnification are performed. Next step 2
In 30, an image forming process based on the image data after the image processing output from the image processing unit 16 is performed by the laser printer unit 1.
8 and the processor unit 20 to create a photographic print in which a subject image based on the image data is recorded.

As described above, a photographic print based on image data representing a subject image subjected to distortion correction and magnification chromatic aberration correction for correcting the aberration of the imaging lens 162 and the scanning lens 76 is obtained.

Next, the image processing executed in step 228 in FIG. 6 will be described in detail with reference to FIGS. FIG.
In step 252, the image data representing the image of the subject obtained by the reading in step 226 in FIG. 6 is fetched into the image processing unit 16, and in the next step 254, the pre-processing unit 82 Processing such as adjustment, contrast adjustment (color gradation processing), dark time correction, defective pixel correction, and shading correction is performed by a known method such as LUT or matrix (MTX) calculation. In the image processing as described above, the image data is developed in a virtual two-dimensional coordinate system shown in FIG. 14A, and the image processing is performed on the image data corresponding to each pixel. By the above image processing,
The resolution information in each of the X-axis direction and the Y-axis direction in FIG.

In the next step 256, it is determined whether or not the operator has instructed the execution of the above-described trimming processing. If there has been an instruction to execute the trimming processing, in step 258, the designated image area shown in FIG. The preprocessing unit 82 performs a trimming process for extracting image data representing an image in the image 192.

In the next step 260, the image data subjected to the above-described image processing is stored in the storage section 84A, and the operator reads the bar code 156 on the photographic film 152 by the bar code reader 98. In the next step 262, the lens identification data of the imaging lens 162 obtained by reading the barcode 156 is input to the correction parameter calculation unit 80, and the line CC is input.
From the D scanner 14, the lens identification data of the scanning lens 76, the information of the reading magnification, the information of the imaging center coordinates (X0, Y0) and the information of the reading center coordinates (X0S, Y0S) in the two-dimensional coordinate system of FIG. Is taken into the correction parameter calculation unit 80.

In the next step 264, the image pickup lens 1
Aberration information corresponding to the lens identification data 62 (aberration information of the imaging lens 162), lens identification data of the scanning lens 76, and aberration information corresponding to the reading magnification (scanning lens 7)
6) from the storage unit 84B into the correction parameter calculation unit 80, and in the next step 266, based on the lens identification data of the imaging lens 162, the imaging lens 1
It is determined whether the amount of aberration of 62 is equal to or greater than a predetermined amount of aberration. That is, in the present embodiment, it is determined whether or not the imaging lens 162 corresponds to one of the lenses having a predetermined large aberration.

If the imaging lens 162 is a lens having a large aberration, the flow advances to step 268 to execute a first aberration correction subroutine of FIG. The image quality deterioration caused by the aberration of the scanning lens 76 and the aberration of the scanning lens 76 is corrected.
On the other hand, if the imaging lens 162 does not correspond to a lens having a large aberration, the process advances to step 270 to execute a second aberration correction subroutine of FIG. To correct the image quality deterioration caused by this. Then, in the next step 271, an interpolation operation is performed on the image data after the aberration correction processing by the image interpolation operation section 94, and in the next step 272, the first
Alternatively, the image data subjected to the second aberration correction processing is output to the laser printer unit 18. As a result, a photograph print of good image quality in which an image based on the image data subjected to the aberration correction is recorded by the laser printer unit 18 and the processor unit 20 (step 23 in FIG. 6).
0).

Next, the first aberration correction processing of FIG. 8 will be described. In step 300 of FIG.
0 calculates an aberration correction parameter (hereinafter, referred to as a scanning lens aberration correction parameter) for correcting image quality deterioration caused by the aberration from the aberration information of the scanning lens 76, and obtains the aberration correction parameter from the aberration information of the imaging lens 162. An aberration correction parameter (hereinafter, referred to as an imaging lens aberration correction parameter) for correcting image quality deterioration due to aberration is obtained. In the present embodiment, an example will be described in which, among the aberrations of the lens, the distortion and the chromatic aberration of magnification of the R color and the B color based on the G color are corrected for image quality deterioration due to these. Accordingly, in step 300, a scanning lens aberration correction parameter and an imaging lens aberration correction parameter are obtained for each of the distortion, the R chromatic aberration of magnification, and the B chromatic aberration of magnification.

In the next step 302, the center coordinates (X
0, Y0) and the read center coordinates (X0S, Y0S) are determined to be coincident or close to a predetermined allowable range. In the next step 304, no trimming processing is performed on the image data. Alternatively, it is determined whether or not center trimming processing has been performed (whether or not trimming processing other than center trimming has been performed).

Here, the imaging center coordinates (X0, Y0)
If the reading and the reading center coordinates (X0S, Y0S) match or are located close to a predetermined allowable range, and the trimming processing has not been performed or the center trimming processing has been performed, the process proceeds to step 306. Then, the switching unit 90 switches so that the image data output from the first aberration correction unit 88 is directly output to the outside of the image processing unit 16 (switches the switching unit 90 upward in FIG. 3). In the next step 308, the scanning lens aberration correction parameter and the imaging lens aberration correction parameter are integrated as follows for each of the distortion, the R color chromatic aberration, and the B color chromatic aberration.

For example, taking the distortion as an example, as shown in FIG.
Assuming that the scanning lens 76 is displaced to the position P1 due to the distortion, the scanning lens 76 is further displaced from the position P1 to the position P2 due to the distortion. Here, the position P2
The correction parameters for the distortion are set so as to return to the normal pixel position P (distortion in the direction opposite to the distortion).

In the next step 310, integrated aberration correction parameters and center coordinate values (imaging center coordinate values (X0, Y0), reading center) for each of distortion, lateral chromatic aberration of R color and lateral chromatic aberration of B color. Coordinates (X0S, Y
0S) to the correction parameter calculator 8
0 to the first aberration correction unit 88, and the next step 3
In 12, the first aberration correction unit 88 performs distortion,
By using the integrated aberration correction parameters for each of the chromatic aberration of magnification R and the chromatic aberration of magnification B, both the image quality deterioration caused by the aberration of the imaging lens 162 and the image quality deterioration caused by the aberration of the scanning lens 76 are simultaneously reduced. to correct.

That is, in the first aberration correction section 88 shown in FIG. 4, the coordinate value (X, Y) of each pixel of the input image data
Is subtracted by the subtractor 102 from the center coordinate value (the imaging center coordinate value (X0, Y0) or the read center coordinate value (X0S, Y0S) supplied in step 310) to obtain the coordinate value (X, Y) of each pixel. ) Is the coordinate value (x, x) of the imaging lens aberration correction coordinate system or the scanning lens aberration correction coordinate system
y). The image data of each pixel whose coordinate values have been converted is input to the distortion correction unit 104, where the image data is corrected using the lens distortion correction parameters.

The R-color image data (R data) of the image data subjected to the distortion correction is input to the R-magnification chromatic aberration correction unit 106, and G is calculated using the chromatic-aberration correction parameter for the R data. R based on color
Correction of chromatic aberration of color is performed. For the B color image data (B data), the B magnification chromatic aberration corrector 10
8, the correction of the chromatic aberration of magnification of the B color based on the G color is performed using the chromatic aberration correction parameter for the B data.

The G color image data (G data) is
Since this serves as a reference for correcting the chromatic aberration of magnification, the chromatic aberration of magnification is input to the adder 112 without being corrected, and the adder 112 adds the center coordinate value to the coordinate value (x, y) of each pixel. Thus, the coordinate value (x, y) of each pixel is calculated as shown in FIG.
(A) is inversely transformed into the coordinate values of the XY coordinate system.

Similarly, the R data after the correction of the chromatic aberration of magnification of the R color is input to the adder 110, and the adder 110 adds the center coordinate value to the coordinate value (x, y) of each pixel. The coordinate value (x, y) of each pixel is represented by X in FIG.
It is inversely transformed into the coordinate value of the Y coordinate system. The B data after the correction of the lateral chromatic aberration of the B color is input to the adder 114,
The center coordinate value is added to the coordinate value (x, y) of each pixel by the adder 114, so that the coordinate value (x, y) of each pixel is obtained.
Is inversely transformed into the coordinate values of the XY coordinate system in FIG.

As described above, the image data (RGB data) which has been subjected to the aberration correction using the integrated distortion correction parameter and the magnification chromatic aberration correction parameters of the R data and the B data are converted to the first aberration correction unit. 88.

As described above, the imaging center coordinates (X0, Y0
) And the read center coordinates (X0S, Y0S) are coincident or located close to a predetermined allowable range, and if the trimming processing has not been performed or the center trimming processing has been performed, an image is taken. Both image quality degradation due to the aberration of the lens 162 and image quality degradation due to the aberration of the scanning lens 76 can be corrected simultaneously, and efficient correction is realized.

On the other hand, step 302 or step 3
If a negative determination is made in step 04, the process proceeds to step 314,
The switching unit 90 switches the image data output from the first aberration correction unit 88 to be output to the second aberration correction unit 92 (switches the switching unit 90 downward in FIG. 3),
In the next step 316, information on the scanning lens aberration correction parameters and the read center coordinates (X0S, Y0S) for each of the distortion, the lateral chromatic aberration of R and the lateral chromatic aberration of B is sent to the first aberration corrector 88. The imaging lens aberration correction parameters and the imaging center coordinates (X0, Y0) for each of the distortion, the lateral chromatic aberration of R color, and the lateral chromatic aberration of B color
Is supplied to the second aberration corrector 92.

In the next step 318, the first aberration correction section 88 corrects the image quality deterioration caused by the aberration of the scanning lens 76 by using the above-mentioned scanning lens aberration correction parameter. The operation of the first aberration correction unit 88 here is the same as that in step 312 described above.

Then, after this correction, step 320
Then, the second aberration correction unit 92 corrects the image quality deterioration caused by the aberration of the imaging lens 162 by using the imaging lens aberration correction parameter. The operation of the second aberration corrector 92 here is the same as that in step 312 described above.

As described above, the imaging center coordinates (X0, Y0
) And the reading center coordinates (X0S, Y0S) are not located within a predetermined allowable range, and when a trimming process other than center trimming is performed, correction of image quality deterioration due to aberration of the scanning lens 76 is performed. Imaging lens 16
Correction of image quality deterioration caused by the second aberration can be sequentially performed.

The order of correction does not matter which one is first. That is, correction of image quality deterioration due to aberration of the imaging lens 162 may be performed first.

Next, the second aberration correction processing of FIG. 9 will be described. In step 292 of FIG.
0 determines a scanning lens aberration correction parameter for correcting image quality deterioration caused by the aberration from the aberration information of the scanning lens 76, and in the next step 294, the switching unit 90 outputs the parameter from the first aberration correcting unit 88. (The switching unit 90 is switched upward in FIG. 3).

In the next step 296, the information on the scanning lens aberration correction parameters and the read center coordinates (X0S, Y0S) for each of the obtained distortion, the chromatic aberration of magnification of R and the chromatic aberration of magnification of B is obtained. Aberration corrector 8
8 Then, in the next step 298, the first
The aberration corrector 88 corrects image quality deterioration caused by the aberration of the scanning lens 76 using the above-described scanning lens aberration correction parameter. The operation of the first aberration correction unit 88 here is the same as that in step 312 described above.

As described above, when the imaging lens 162 does not correspond to a lens having a large aberration (in the case of a negative determination in step 266 of FIG. 7), the second aberration correction processing of FIG. Correction of image quality deterioration caused only by the aberration of the scanning lens 76 is performed.

According to the embodiment described above, the following 3
Correction of aberration appropriate for each case is performed for each case, and a photographic print of good image quality without image quality deterioration due to the aberration of the scanning lens 76 and the aberration of the imaging lens 162 can be obtained.

In the first case (imaging center coordinates (X0,
Y0) and the reading center coordinates (X0S, Y0S) are coincident or located close to a predetermined allowable range, and no trimming processing is performed or the center trimming processing is performed). Both the image quality degradation caused by the aberration of the scanning lens 76 and the image quality degradation caused by the aberration of the scanning lens 76 can be corrected at the same time, and an efficient correction process is realized.

In the second case (imaging center coordinates (X0,
Y0) and the reading center coordinates (X0S, Y0S) are not located within a predetermined allowable range, and the case where trimming processing other than center trimming is performed)
The correction of the image quality deterioration caused by the aberration of the scanning lens 76 and the correction of the image quality deterioration caused by the aberration of the imaging lens 162 can be sequentially executed.

In the third case (the case where the imaging lens 162 does not correspond to a lens having a large aberration), the correction processing for the aberration of the imaging lens 162 is omitted, and the correction of the image quality deterioration caused only by the aberration of the scanning lens 76 is not performed. Be executed. That is, aberration correction can be appropriately performed according to the magnitude of the aberration of the imaging lens 162.

In the embodiment described above, it is determined whether or not the imaging lens 162 corresponds to a lens having a large aberration, and it is determined whether or not the amount of aberration of the imaging lens 162 is equal to or larger than a predetermined amount of aberration. However, the present invention is not limited to this. The image of the reference subject projected on the photographic film 152 via the imaging lens 162 is captured, and the reference image recorded on the photographic film 152 by the imaging is captured. Based on image data obtained by projecting and reading the subject image via the scanning lens 76, it may be determined whether the amount of aberration of the imaging lens 162 is equal to or greater than a predetermined amount of aberration.

Here, the reference subject is, for example, a subject having a linear portion in a predetermined direction, such as the above-described grid chart 150, telephone pole, building, or the like.

Further, the optical characteristic information of the imaging lens 162 may be obtained, and based on the obtained optical characteristic information, it may be determined whether or not the amount of aberration of the imaging lens 162 is equal to or larger than a predetermined amount of aberration.

Here, the optical characteristic information of the image pickup lens 162 includes, for example, the distortion amount of the image pickup lens 162 itself, the chromatic aberration of magnification, the peripheral light amount decrease, and the like.

In the above description, the lens identification data of the imaging lens 162 is stored in the photographic film 152 with the latent image bar code 1.
Although an example in which the lens identification data is recorded in advance at 56 is shown, the lens identification data may be recorded as a barcode on the cartridge 158 (see FIG. Housing,
Printing may be performed on either the cartridge 158 or the photographic film 152.

[0106]

As described above, according to the first aspect of the present invention, the image quality of the subject image represented by the image data obtained by the image reading means due to the aberration of the first and second lenses. Can be efficiently corrected. Further, even when an image pickup unit having an inexpensive lens and an image reading unit (such as a scanner) having an inexpensive lens are used,
Good image quality is obtained.

According to the second to fifth aspects of the present invention, it is possible to appropriately perform aberration correction according to the amount of aberration of the first lens.

According to the seventh aspect of the present invention, the second
Even if information on the aberration of the lens is unknown, the information can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a digital laboratory system according to an embodiment of the present invention.

FIG. 2 is an external view of a digital laboratory system.

FIG. 3 is a block diagram illustrating a configuration of an image processing unit.

FIG. 4 is a block diagram illustrating a configuration of an aberration correction unit.

FIG. 5 is a flowchart showing a processing routine of a scanning lens aberration calculation process.

FIG. 6 is a flowchart showing a processing routine of an aberration correction process.

FIG. 7 is a flowchart showing a subroutine of image processing by an image processing unit.

FIG. 8 is a flowchart showing a subroutine of a first aberration correction process.

FIG. 9 is a flowchart showing a subroutine of a second aberration correction process.

FIG. 10 is a diagram showing a film on which a grid chart is recorded in advance.

FIG. 11 is a diagram showing a film in which a latent image barcode representing lens identification data of an imaging lens is recorded in advance.

FIG. 12 is a schematic view of a camera (film with lens) used at the time of imaging.

FIG. 13 is a diagram for explaining a trimming process.

14A is a diagram illustrating a virtual two-dimensional coordinate system in which image data is expanded when performing image processing in an image processing unit; FIG. 14B is a diagram illustrating an imaging center S (X0, Y0); It is a figure which shows the two-dimensional coordinate system which made the origin the origin, and (C) is a figure which shows the two-dimensional coordinate system which made the reading center T (X0S, Y0S) the origin.

FIG. 15 is a diagram for describing an outline of integration of a scanning lens aberration correction parameter and an imaging lens aberration correction parameter.

16A is a diagram showing an image in which barrel distortion occurs due to lens distortion, and FIG. 16B is an image in which pincushion distortion occurs due to lens distortion. FIG.

FIG. 17 is a diagram showing color fringing caused by chromatic aberration of magnification of a lens.

FIG. 18 is a diagram for describing an interpolation calculation by an image interpolation calculation unit.

[Explanation of symbols]

 Reference Signs List 10 digital laboratory system 14 line CCD scanner 16 image processing unit 34 digital camera 76 scanning lens 80 correction parameter calculation unit 86 aberration calculation unit 88 first aberration correction unit 92 second aberration correction unit 150 grid chart 160 film with lens 162 Imaging lens

Claims (7)

[Claims] 1. An image of a subject projected through a first lens is taken by an image pickup means loaded with a photographic photosensitive material, and a subject image recorded on the photographic photosensitive material by the imaging is taken into a second image. An aberration correction method for image data obtained by projecting through the lens and reading by the image reading means, wherein information relating to the aberration of the first lens and information relating to the aberration of the second lens are provided. Acquiring, based on the acquired information on the aberrations of the first and second lenses, obtained by reading by the image reading means,
An aberration correction method for simultaneously correcting a decrease in image quality of the image data representing the subject image due to aberrations of the first and second lenses of the subject image represented by the image data. 2. An image of a subject projected through a first lens is captured by an image capturing means loaded with a photographic photosensitive material, and a subject image recorded on the photographic photosensitive material by the imaging is captured by a second lens. A method for correcting image data obtained by projecting through the lens and reading the image data by the image reading means, wherein information relating to the aberration of the first lens and information relating to the aberration of the second lens are provided. And determining whether the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration. If the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration, Based on the information regarding the aberration of the second lens, the image data is simultaneously corrected for the deterioration of the image quality of the subject image represented by the image data due to the aberration of the first and second lenses, and Lens aberration When the amount is less than a predetermined amount of aberration, the image data is caused by the aberration of the second lens of the subject image represented by the image data based on the information on the aberration of the second lens. An aberration correction method that corrects image quality degradation. Determining whether the first lens corresponds to one of lenses having a predetermined large aberration, thereby determining the aberration amount of the first lens to a predetermined aberration amount; 3. The aberration correction method according to claim 2, wherein it is determined whether or not the above is true. 4. An image of a reference subject projected onto the photographic photosensitive material via a first lens, and a reference subject image recorded on the photographic photosensitive material by the imaging is captured via a second lens. And determining whether or not the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration based on image data obtained by reading the image by the image reading unit. Aberration correction method. 5. Acquiring optical characteristic information of the first lens, and determining whether or not the amount of aberration of the first lens is equal to or greater than a predetermined amount of aberration based on the acquired optical characteristic information. 3. The aberration correction method according to claim 2, wherein: 6. The information on the aberration of the lens is any one of information indicating the aberration of the lens, a correction parameter for correcting the aberration of the lens, and information indicating a type of the imaging unit. The aberration correction method according to claim 1. 7. The information on aberration of the second lens is obtained by reading an image of a predetermined test image projected through the second lens by the image reading unit, and reading the image. The image distortion of the test image resulting from the aberration of the second lens is detected based on the image data, and the distortion of the image is detected from the detected image distortion of the test image. 7. The aberration correction method according to any one of 6.