JP2005091434A - Position adjusting method and image reader with damage compensation function using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide simple technique for obtaining the accurate correspondence of positional relation between image information obtained from a sensor for visible light and image information obtained from a sensor for infrared light. <P>SOLUTION: The position adjusting method is a method for adjusting the positions of a visible light image from photographic film acquired by the sensor for visible light and an infrared light image from the photographic film acquired by the sensor for infrared light. The visible light image and the infrared light image are divided into a plurality of areas, and positional shift is performed several times in corresponding area units, and also pattern matching processing is performed between the visible light image and the infrared light image at respective shifted positions. The shifted position where a matching rate is the highest is regarded as the accurate positional relation between the visible light image and the infrared light image. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a position adjustment method, a position adjustment program, and a position adjustment program for a visible light image from a photographic film acquired by a visible light sensor and an infrared light image from the photographic film acquired by an infrared light sensor. The present invention relates to an image reading apparatus with a flaw correction function for generating a photographic film image having a flaw corrected from an optical image and an infrared light image.

  A photographic printing apparatus (generally called a minilab) that reproduces a photographed image formed on a photographic film as a photographic print has recently been digitized, and the photographed image of the photographic film is photoelectrically read and read. Is converted into a digital signal, and then various image processes are performed to obtain print data. The photographic paper is exposed based on the print data to produce a photographic print. Such a digitized photographic printing apparatus is therefore provided with an image reading apparatus that photoelectrically reads an image recorded on a film, an image processing apparatus that performs image processing on the read image and converts it into print data, and a print And a printing apparatus that exposes and develops photographic paper according to data.

  An image reading apparatus used in such a photographic printing apparatus irradiates a photographic film with light emitted from a light source, and in general, the transmitted light is detected by a CCD sensor or the like and photographed on the photographic film. However, it is also possible to detect scratches and dust on the photographic film (hereinafter simply using the word “scratch” as a generic term for scratches and dust). By specifying, an image reading apparatus with a flaw correction function for correcting an image affected by the flaw has appeared. In general, visible light is affected by both the image itself taken on the photographic film and scratches and dust on the photographic film, while infrared light is affected by scratches and dirt on the photographic film. The dust is affected by scattering, but utilizes the phenomenon that it is not affected by the image (that is, the basic color component) taken on the photographic film itself (see, for example, Patent Document 1).

  However, in the above-described scratch correction, when the visible image and the infrared image of the photographic film are compared, even if the same photographic film is read with the same lens, the position of the same object (the same part) in the photographic film image Since there is a slight shift between the image information obtained from the visible light sensor and the image information obtained from the infrared light sensor, the position of the scratches detected by the infrared image in the infrared image It has become clear that if the image is applied to a visible image as it is, a location slightly different from the location where the scratch is actually present is corrected. The cause of the difference between the image information obtained from the visible light sensor and the image information obtained from the infrared light sensor is due to the assembly error of the optical system including the visible light and infrared light sensors and its change over time. In addition, aberrations of the lens can be considered.

  In order to accurately associate the positional relationship between the image information obtained from the visible light sensor and the image information obtained from the infrared light sensor, a reference chart having a grid line is scanned and A technique is known in which a correction parameter for correcting a deviation of an external light image is obtained, the correction parameter is stored in the apparatus as a machine difference parameter, and used for flaw correction (see, for example, Patent Document 2).

  Further, a calibration chart having six through-holes arranged in parallel at equal pitches is inserted into a photographic film image reading point, and the hole pitch and infrared light obtained from an image obtained by a visible light sensor are used. From the hole pitch obtained from the image obtained by the sensor, obtain the ratio of the magnification when reading the image of the photographic film with the sensor for visible light and the magnification when reading the image of the photographic film with the sensor for infrared light, There is also a technique of determining a position correction formula for matching the positional relationship on the photographic film image between the visible light image and the infrared light image from the ratio, and using this position correction formula for flaw correction (for example, (See Patent Document 3).

JP-A-6-28468 (paragraph number 0016, FIG. 1) JP 2001-7987 (paragraph number 0029-0032, FIG. 3) JP 2001-157003 A (paragraph numbers 0033-0037, FIG. 2 and FIG. 3)

  However, in the above-described prior art, in order to accurately associate the positional relationship between the image information obtained from the visible light sensor and the image information obtained from the infrared light sensor, the reference chart or the calibration chart is used as a photographic film. It was necessary to carry out a calibration operation completely separate from the normal operation by inserting it into the image reading point, which put a great burden on the operator of the photographic printing apparatus. In view of the above situation, an object of the present invention is to provide a simple technique for accurately associating a positional relationship between image information obtained from a visible light sensor and image information obtained from an infrared light sensor. An object of the present invention is to provide an image reading apparatus employing the technology.

  In order to solve the above problems, the present invention performs position adjustment between a visible light image obtained from a photographic film obtained by a visible light sensor and an infrared light image obtained from the photographic film obtained by an infrared light sensor. In the method according to the above, a position shifting process is performed in which the relative position of the visible light image and the infrared light image is shifted a plurality of times, and pixel values included in the infrared light image are included in the visible light image at each shifted position. A dispersion calculation process for calculating a dispersion value of the pixel value of the visible light image that has been corrected after performing a flaw correction process for the pixel value to be corrected, and a shift position that leads to the lowest dispersion value is set as the shift position that derives the lowest dispersion value This is regarded as the correct positional relationship of the optical image.

  In the present invention, when a visible light image captured under the influence of a scratch existing in a photographic film is appropriately corrected using the captured infrared light image, an area corresponding to the scratch is detected. Based on the inventor's insight that the dispersion value of the corrected visible light image tends to be small because the pixel value is flattened. In other words, if the relative position between the visible light image and the infrared light image is shifted variously and the flaw correction is performed using the infrared light image each time, if there is a positional shift between the visible light image and the infrared light image, red Since the flaw correction using the external light image is not properly performed, the dispersion value of the corrected visible light image is not reduced, and red when the visible light image and the infrared light image are not misaligned (or small). Since the scratch correction using the external light image is appropriately performed, the dispersion value of the visible light image after the correction becomes small. For this reason, it can be determined that the positional relationship between the visible light image and the infrared light image that produce the smallest dispersion value is the correct positional relationship. As the flaw correction algorithm used at that time, it is preferable to use one known from the above-mentioned publicly-known materials.

  This method is particularly superior to other conventional methods in that a visible light image from a photographic film obtained by a visible light sensor and an infrared from the photographic film obtained by an infrared light sensor. Position between images based on CCD mounting error, lens characteristics (aberration), etc., only by image processing including flaw correction processing implemented by hardware and / or software using optical images This means that misregistration can be adjusted, and no adjustment tool such as a reference chart is used for misregistration adjustment as in the prior art. For this reason, misregistration adjustment can be easily performed at any time without burdening the operator. This is particularly effective for regular misregistration adjustment accompanying a change with time.

  In one preferred embodiment of the present invention, the visible light image and the infrared light image are divided into a plurality of regions, and the position shift processing, the flaw correction processing, and the variance calculation processing are performed in units of the corresponding regions. The correct positional relationship between the visible light image and the infrared light image is set for each region. In this method, misregistration adjustment between visible light image and infrared light image becomes possible in units of partial areas, so adjustment of misregistration that differs depending on local image areas caused by lens aberration etc. Is also possible.

  In the case of a color image, it is usually composed of images for each of three reference colors such as R (red), G (green), and B (blue). Therefore, in another preferred embodiment of the present invention, the position shifting process, the flaw correction process, and the dispersion calculation process are the reference colors constituting the visible light image. The average value of the variance values calculated for each image and for each reference color represents the variance value at the corresponding shift position.

  The relative position shifting process between the visible light image and the infrared light image may be performed in at least four directions (up, down, left, and right), but is preferable in order to achieve more accurate misregistration adjustment when there is no problem in the calculation speed. Is preferably performed in eight directions including an oblique direction. The up, down, left, and right directions here are the X axis positive direction and the negative direction and the Y axis positive direction and the negative direction in the image arranged on the XY coordinate plane, and the oblique direction is inclined from the X axis or the Y axis. Direction.

  In one preferred embodiment of the present invention, the correct positional relationship is made into a position adjustment table in units of pixels, and the pixels of the visible light image are correctly associated with the pixels of the infrared light image through the position adjustment table. . When correcting the visible light image based on the flaw information found in the infrared light image, this adjustment table is used to convert the pixel position of the infrared light image into the pixel position of the visible light image, thereby misregistration. Thus, the misregistration adjustment function according to the present invention can be added without greatly changing the conventional flaw correction algorithm that does not have the misregistration adjustment function.

  The present invention also covers a program for causing a computer to execute the above-described position adjustment method for a visible light image and an infrared light image, and a medium on which the program is recorded.

In the present invention, the image reading apparatus with a flaw correction function that adopts the above-described position adjustment method is also subject to rights, and the image reading apparatus with a flaw correction function includes a visible light sensor, an infrared light sensor, , A memory for storing a visible light image from the photographic film obtained by the visible light sensor and an infrared light image from the photographic film obtained by the infrared light sensor, and the visible image developed in the memory An image shift unit that shifts the relative position of the light image and the infrared light image, and a pixel value included in the infrared light image between the visible light image and the infrared light image shifted by the image shift unit. A first flaw correction unit that performs flaw correction processing of pixel values included in the visible light image using, and a variance calculation unit that calculates a variance value of pixel values of the visible light image corrected by the first flaw correction unit And double A positioning unit that determines a shift position that leads to the lowest dispersion value among the dispersion values obtained at the shift position as a correct positional relationship between the visible light image and the infrared light image, and a correct value determined by the positioning unit. A second flaw correction unit is provided that generates a photographic film image that has been flaw-corrected from the visible light image and the infrared light image under the positional relationship. Naturally, this image reading apparatus with a flaw correction function can also obtain all the effects of the above-described position adjustment method. In addition, the first flaw correction unit and the second flaw correction unit may be used together. However, the first flaw correction unit is intended only for misregistration adjustment, and thus the second flaw correction is performed using a simple flaw correction algorithm. It is advantageous to use a full flaw correction algorithm using a visible image and an infrared image that have been misregistered. Of course, when the first flaw correction unit and the second flaw correction unit are combined, there is an advantage that misregistration adjustment and flaw correction are performed simultaneously.
Other features and advantages of the present invention will become apparent from the following description of embodiments using the drawings.

  FIG. 1 is an external view showing an image printing system equipped with an image reading apparatus with a flaw correction function according to the present invention. This photographic printing system is a photographic film 1 developed by a film developing machine (not shown here). An operation station OS including an image reading device 3 that reads a captured image frame of a unit film) as digital image data, a controller 4 that performs image processing on the acquired image data and creates print information, and the like. The printing station 2 includes a print station PS that performs exposure processing and development processing on the photographic paper 2 based on print information from the station OS to create a photographic print 2a. The controller 4 is basically composed of a general-purpose personal computer. The personal computer includes a monitor 4a for displaying the operation screen of the photo print system, a media reader 4b for reading an image from a memory card such as a digital camera, and an operator. The keyboard 4c used for the operation input by is incorporated.

  As shown in FIG. 2, the print station PS pulls out the roll-shaped photographic paper 2 stored in the two photographic paper magazines 11 and cuts it into a print size by the sheet cutter 12, and is cut in this way. On the photographic paper 2, print processing information such as color correction information and frame number is printed on the back surface of the photographic paper P by the back print unit 13, and a photographed image is exposed on the surface of the photographic paper 2 by the exposure print unit 14. The exposed photographic paper 2 is sent to a processing tank unit 15 having a plurality of development processing tanks for development processing. The photographic paper 2, that is, the photographic prints 2a, sent to the sorter 17 from the transverse feed conveyor 16 at the upper part of the apparatus after drying, is collected in a state of being sorted in units of orders on a plurality of trays 17a of the sorter 17 (FIG. 1). reference).

  A photographic paper transport mechanism 18 is laid to transport the photographic paper 2 at a transport speed in accordance with various processes for the photographic paper 2 described above. The photographic paper transport mechanism 18 is composed of a plurality of nipping and transporting roller pairs including a chucker type photographic paper transport unit 18a disposed before and after the exposure unit 14 in the photographic paper transport direction.

  The exposure print unit 14 applies R (red) and G (green) to the photographic paper 2 conveyed in the sub-scanning direction based on print information such as print data from the operation station OS along the main scanning direction. A line exposure head for irradiating laser beams of the three primary colors B (blue) is provided. The processing tank unit 15 includes a color developing tank 15a for storing a color developing processing liquid, a bleach-fixing tank 15b for storing a bleach-fixing processing liquid, and a stabilizing tank 15c for storing a stable processing liquid.

  The image reading apparatus 3 is a film scanner with a flaw correction function, and includes an illumination optical system 31, a zoom lens 32 as an imaging optical system, and a dichroic mirror 33 that divides incident light into visible light and infrared light as main components. Further, a visible light sensor unit 34 and an infrared light sensor unit 35 are provided. The illumination optical system 31 includes a halogen lamp or a light emitting diode as a light source, and a mirror tunnel or a diffusion plate that dimmes light from the light source. The visible light sensor unit 34 includes three CCD arrays 34a each equipped with a color filter suitable for detecting a visible light image composed of three basic color components (for example, R, G, B) of the film 1, and these A visible light signal processing circuit 34 b that processes the visible light signal detected by the CCD array 34 a to generate R, G, B image data composed of basic color components and transfers the image data to the controller 4. On the other hand, the infrared light sensor unit 35 is disposed so as to receive only the infrared light branched from the dichroic mirror 33 in order to detect the state of scratches on the film 1 as an infrared light image. The CCD array 35a and an infrared light signal processing circuit 35b for processing infrared light signals detected by the CCD array 35a to generate infrared light image data and transferring the infrared light image data to the controller 4 are provided.

  In the image reading apparatus 3 configured as described above, when the photographed image frame of the film 1 is positioned at a predetermined reading position, reading processing of the photographed image frame is started. Are sequentially read by the visible light sensor unit 34 and the infrared light sensor unit 35 in the form of being divided into a plurality of slit images by the feeding operation of the film 1 in the sub-scanning direction by the film transport mechanism 36. It is photoelectrically converted into an image signal of G and B color components and an image signal of an infrared component and sent to the controller 4 as raw digital image data. Each control of the illumination optical system 31, the imaging optical system 32, the visible light sensor unit 34, and the infrared light sensor unit 35 is performed by the controller 4, and in this embodiment, one of the controllers 4 is controlled. The functional part of this part is a component of the image reading apparatus 3.

  The controller 4 has a CPU as a core member, and a functional unit for performing various processes on input data is implemented by hardware and / or software, but the functional unit particularly related to the present invention. As shown in FIG. 3, a visible light image from the film 1 acquired by a memory 41 for temporarily storing an image (specifically, image data) for various processing and a visible light sensor unit 34 Read image preprocessing means 50 for performing misregistration adjustment and film flaw correction, which will be described in detail later, using the infrared light image from the film 1 acquired by the infrared light sensor unit 35, and this read image Color correction for image data (visible light image data) that has been subjected to scratch correction processing by the preprocessing means 50 and developed in the memory 41 An image processing unit 42 that performs various image processing such as filtering (blurring, sharpness, etc.) and trimming, captures image data and other display items into a video memory, and converts the image developed in the video memory into a video signal by a video controller. The video control unit 43 to be sent to the monitor 4a, the final image data processed by the image processing unit 42, etc., are converted into print data and transferred to the exposure print unit 14 of the print station PS, and the GUI There is a print management unit 45 that controls each functional unit based on an operation command input through the keyboard 4c or the like under an operation screen created by using or a pre-programmed operation command.

  The read image preprocessing unit 50 includes an image shifting unit 51 that shifts the relative positions of the visible light image and the infrared light image developed in the memory 41, and the visible light image and the infrared light image shifted by the image shifting unit 51. A first flaw correction unit 52 that performs flaw correction processing on pixel values included in the visible light image using pixel values included in the infrared light image, and the visible light corrected by the first flaw correction unit 52 The dispersion calculation unit 53 that calculates the dispersion value of the pixel value of the light image, and the displacement position that leads the lowest dispersion value among the dispersion values obtained at the plurality of displacement positions is the correct position of the visible light image and the infrared light image. A positioning unit 54 that determines the relationship, a position adjustment table 55 that stores information indicating the correct positional relationship determined by the positioning unit, and a visible light image and an infrared light image using the position adjustment table 55 Scratch correction from The and a second defect correction unit 56 to generate a photographic film image (image data).

  In this embodiment, the first flaw corrector 52 uses a threshold value set based on an average value of an infrared image or a fixed value obtained experimentally as a film flaw determination condition, and an infrared image that falls below the threshold value. By adding the pixel value to the corresponding pixel value of the visible light image, a flaw correction algorithm that can be processed easily but at a high speed is used to compensate for the pixel value decrease due to the flaw. The second flaw correction unit 56 is not described in detail here, but is more complicated in that it performs flaw correction by selecting an optimal one from a plurality of flaw correction algorithms in consideration of statistical characteristics of film flaws. There is a highly accurate flaw correction algorithm.

  As schematically shown in FIG. 4, the image shifting unit 51 is one of a visible light image (here, red (R) image) and an infrared light (IR) image (here,) developed in the memory 41. The target pixel: R (x, y) is defined for the R image), the movement operation region T is set around the target pixel, and the corresponding position: IR ( The movement operation area T is set around x, y), and the movement operation area T of the IR image is shifted in eight directions indicated by arrows and is shifted by about 10 pixels one pixel in each direction. The first flaw correction unit 52 reads out the density values of the pixels of the R image and the IR image included in each moving operation area T, and uses the flaw correction algorithm described above (the threshold value is common to all image areas). Or may be set for each moving operation area), and the R image included in the moving operation area is subjected to flaw correction, and the dispersion calculation unit 53 further performs flaw correction on the R image. The variance value is calculated. In the description here, the R image is described as the visible light image, but the same applies to green (G) and blue (B) images. That is, variance values at all the shifted positions (including the home position) are obtained with the set target pixel: R (x, y), G (x, y), and B (x, y) as the home position. In addition, the average value of the dispersion values of the R image, the G image, and the B image obtained at one shift position represents the dispersion value at the shift position. The positioning unit 54 determines that the shift position giving the minimum dispersion value among the (representative) dispersion values obtained in this way is the correct position of the visible image and the infrared image.

  Although the size of the moving operation area T varies depending on the image data size to be processed, it is preferably 50 × 50 (pixels) in the case of an image data size of about 2000 × 3000 (pixels), but a larger size may be adopted. . The moving pitch of the pixel of interest: R (x, y) varies depending on the size of the moving operation area T, but is preferably about 25 to 50 (pixels) when the size is about 50 × 50. Pixel of interest: Misregistration adjustment amount for each movement pitch of R (x, y), that is, the correct positional relationship between the R image and IR image is required. If fine misregistration adjustment is required, The moving pitch of the pixel of interest: R (x, y) may be reduced.

  In this embodiment, the flaw correction processing executed at each shift position and the dispersion value calculation of the visible light image after flaw correction are performed by an integrated arithmetic expression. Therefore, the pixel value of the visible light image used in the dispersion value calculation is added by the above-described threshold value of film scratch determination: the difference between the corresponding pixel values of the CF and the infrared image, that is, the pixel value of the infrared image below the threshold value. It has been done. This threshold value: adding the difference between the corresponding pixel values of the CF and the infrared image is the flaw correction. Since the pixel value of the infrared image that is not affected by the film scratch is substantially equal to the threshold value, the pixel value of the visible light image remains unchanged.

この数式１は、特定のずらし位置におけるＲ画像の分散値であるが、同様にＧ画像の分散値としてgＶ(α,β)、Ｂ画像の分散値としてbＶ(α,β)が求められる。これらの分散値の平均値が、つまり
aＶ(α,β)=（rＶ(α,β)＋gＶ(α,β)＋bＶ(α,β)）÷３
がこのずらし位置における可視光画像の分散を代表する。 An arithmetic expression for calculating a dispersion value of a visible light image in which such a scratch correction process is incorporated (here, only the R image is described) is as follows. At this time, the movement operation region T N = (2n + 1) × (2n + 1), the R image is the r image, the IR image is the d image, and the pixels (density values) contained therein are two subscripts for r and d. The subscripts α and β are the shift amounts in the x and y directions, respectively.

Equation 1 is the dispersion value of the R image at a specific shift position. Similarly, gV (α, β) is obtained as the dispersion value of the G image, and bV (α, β) is obtained as the dispersion value of the B image. The average of these variance values is
aV (α, β) = (rV (α, β) + gV (α, β) + bV (α, β)) ÷ 3
Represents the dispersion of the visible light image at this shifted position.

  The dispersion value of the visible light image: aV (α, β) is obtained at all the shift positions (all the combination positions of α and β), and the shift position giving the smallest value among them is the movement operating region. This is the correct position of the visible and infrared images.

Next, the position adjustment routine for the visible light image (R / G / B image) and the infrared image (IR image) according to the present invention will be described with reference to the flowchart of FIG. 5 while keeping the schematic diagram of FIG. 4 in mind. ;
First, initial coordinates (x, y) of the target pixel are set (# 01). The coordinate position (x, y) of the pixel of interest depends on the image size so that the movement operation area T set there at a predetermined movement pitch covers the entire image area with an overlap of about 1/2. Is predetermined. As shown in FIG. 4, the movement operation region T is set around the target pixel (x, y) in the R, G, B image developed in the memory 41 (# 02).

  The movement operation region T is set around the pixel IR (x + α, y + β) (initially α = 0, β = 0) in the IR image corresponding to the target pixel in the R image (# 03). Scratch correction is performed between the R, G, B images included in the movement operation area T set in step # 02 and step # 03 and the pixel group of the IR image on the basis of the arithmetic expression shown in equation (1). The variance value calculation is performed, and the calculated variance value of the visible image is stored (# 04). It is checked whether or not the movement operation area T set in the IR image has finished a predetermined shift amount in all directions (eight directions) (# 05). The moving operation area T is shifted by 10 pixels in every direction from one target pixel as the origin. That is, α and β are incremented from −10 to +10, respectively. If “No” in the check of Step # 05, the position of the target pixel in the IR image is changed (shift of α and β) in order to shift the movement operation area, and the process jumps to Step # 03 (# 06).

  If “Yes” in the check of Step # 05, the minimum is selected from all the dispersion values obtained through the repetition of Steps # 03 to # 06 with respect to the current pixel of interest, and the amount of misregistration that gives the dispersion value, that is, α and The values of β are recorded as positional deviation values in the X and Y directions (the position shifted by this amount is the correct position) (# 07). Next, it is checked whether or not the calculation of the displacement value at the positions of all the target pixels determined by the image size has been completed (# 08). If “No” in the check of step # 08, the target pixel to be set in the visible image is set to the next coordinate position (# 09), the process jumps to step # 2, and the movement pitch of all the target pixels is completed. The position deviation value is recorded while repeating the processes of steps # 02 to # 07. Here, the movement pitch of the target pixel is set to 50 pixels, for example, assuming that the movement operation region T is about 50 × 50. In this case, the positional deviation values (α and β values) are obtained at a 25 pixel pitch.

  If “Yes” in the check of Step # 08, the position adjustment table 55 is created or adjusted using the position shift value group obtained while moving the target pixel in the visible image at a predetermined pitch (50 pixels) (# 10 ).

  Since the positional deviation value group obtained by this positional adjustment routine has a pitch of 50 pixels, this positional deviation value is adapted to each pixel of the actual image size by using a well-known smoothing process. Create a table. Since the positional deviation values are obtained in the X direction (main scanning direction) and the Y direction (sub scanning direction), a positional deviation value table in the X direction and the Y direction is created. In this embodiment, a position adjustment table indicating the correct positional relationship between the visible light image and the infrared light image in pixel units, that is, the pixel coordinate value of the other image with respect to the pixel coordinate value of one image, based on the position shift value table. 55 is created or modified. This position adjustment table 55 is used for full-scale flaw correction processing of a film using IR image information by the second flaw correction unit 56.

In the above embodiment, a target pixel is defined in the visible light image developed in the memory 41, the movement operation region T is set around the target pixel, and the target image is also supported for the infrared light image. The movement operation area T is set around the position where the movement is performed, and the flaw correction and the dispersion value calculation are performed. Conversely, the attention pixel is determined in the infrared light image, and the movement operation area T is set around the attention pixel. At the same time, a movement operation region T for shifting the position of the visible light image may be set to perform flaw correction and variance value calculation.
Further, in the above embodiment, the dispersion value of the R image, the G image, and the B image at a specific shift position is arithmetically averaged to represent the dispersion of the visible light image at the shift position. A weighted average may be adopted, and a method of taking the maximum value or the minimum value among the dispersion values of the R image, the G image, and the B image can be considered. In a special case, it is also possible to obtain a variance value of only one or two of the R image, the G image, and the B image.

  The position adjustment technology according to the present invention is a method of performing visible image processing using infrared light images and visible light images and infrared light that are acquired and developed in a memory due to lens aberration, CCD characteristics, and the like. The present invention can be used in the field of adjusting a pixel coordinate value shift between images without using a calibration plate or the like.

FIG. 1 is an external view of a photographic print system incorporating an image reading apparatus with a flaw correction function using a position adjustment method according to the present invention. Schematic configuration diagram of photo print system Functional block diagram of controller Explanatory drawing of template matching processing between visible light image and infrared light image Flowchart showing a position adjustment routine between a visible light image (R image) and an infrared image (IR image)

Explanation of symbols

3: Image reader 34: Sensor unit for visible light (sensor for visible light)
35: Infrared light sensor unit (infrared light sensor)
41: Memory 50: Read image preprocessing means 51: Image shifting unit 52: First flaw correction unit 53: Division calculation unit 54: Positioning unit 55: Position adjustment table 56: Second flaw correction unit

Claims (8)

In the position adjustment method of the visible light image from the photographic film acquired by the visible light sensor and the infrared light image from the photographic film acquired by the infrared light sensor,
A position shift process for shifting the relative position between the visible light image and the infrared light image a plurality of times and pixel values included in the visible light image using the pixel values included in the infrared light image at each shifted position are performed. After performing the scratch correction process, a dispersion calculation process is performed to calculate a dispersion value of the pixel value of the visible light image that has been corrected, and a shift position that leads to the lowest dispersion value is set to be correct between the visible light image and the infrared light image. A position adjustment method characterized by being regarded as a positional relationship.   The visible light image and the infrared light image are divided into a plurality of regions, the position shift processing, the flaw correction processing, and the dispersion calculation processing are performed in units of the corresponding regions, and the visible light image is processed in units of the regions. The position adjustment method according to claim 1, wherein a correct positional relationship of the infrared light image is set.   The position shift process, the flaw correction process, and the dispersion calculation process are performed for each reference color image constituting the visible light image, and the average value of the dispersion values calculated for each reference color is the dispersion value at the corresponding shift position. The position adjustment method according to claim 1 or 2, wherein   The relative position shifting process between the visible light image and the infrared light image is performed in at least four directions (up, down, left, and right), and preferably in eight directions including an oblique direction. The position adjustment method described in 1.   5. The correct positional relationship is made into a position adjustment table for each pixel, and the pixels of the visible light image are correctly associated with the pixels of the infrared light image through the position adjustment table. The position adjustment method according to Crab.   A function of shifting a relative position between a visible light image obtained from a photographic film obtained by a visible light sensor and an infrared light image obtained from the photographic film obtained by an infrared light sensor a plurality of times; After performing a flaw correction process on the pixel value included in the visible light image using the pixel value included in the infrared light image, a dispersion calculation process is performed to calculate a dispersion value of the corrected pixel value of the visible light image. A position adjustment program that causes a computer to execute a function and a function of determining a shift position that leads to the lowest dispersion value as a correct positional relationship between the visible light image and the infrared light image. A visible light sensor, an infrared light sensor, and a visible light image obtained from the photographic film obtained by the visible light sensor and an infrared light image obtained from the photographic film obtained by the infrared light sensor are stored. In the image reading apparatus with a flaw correction function provided with a memory for
An image shift unit configured to shift a relative position between the visible light image and the infrared light image developed in the memory; and the infrared light between the visible light image and the infrared light image shifted by the image shift unit. A first flaw correction unit that performs flaw correction processing on pixel values included in the visible light image using pixel values included in the image, and dispersion of pixel values of the visible light image corrected by the first flaw correction unit A dispersion calculation unit that calculates a value, and a positioning unit that determines a shift position that leads to the lowest dispersion value among dispersion values obtained at a plurality of shift positions as a correct positional relationship between the visible light image and the infrared light image And a second flaw correction unit that generates a photographic film image that has been flaw-corrected from the visible light image and the infrared light image under the correct positional relationship determined by the positioning unit. Images with scratch correction function Winding device.   The image shifting unit divides the visible light image and the infrared light image into a plurality of regions and shifts the position in units of corresponding regions, and the first scratch correction unit and the dispersion calculation unit perform scratches in the region units. The image reading apparatus with a flaw correction function according to claim 7, wherein correction processing and dispersion value calculation are performed.

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