JP2001312010A - Frame image specifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame image specifying device which is capable of reducing a cost by abolishing a line sensor (image plane detecting sensor) for detecting the edges of frame images. SOLUTION: This frame image specifying device 1 specifies the positions at the edges of the frame images from a transporting roller mechanism for transporting the negative film F formed with the frame images along the transporting route, a line scanner 2 for reading the image information of the negative film F and the image information read by this line scanner 2. The device described above has a detecting sensor 28 which detects the perforations formed at the negative film F, an edge detecting section 7c which detects the edges from the image information read by the line scanner 2 and an edge position specifying section 7 which specifies the positions of the edges of the image information in accordance with the relative positional relation between the perforation signals outputted from the detecting sensor 28 and the edges detected by the edge detecting section 7c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying means for conveying a photographic film on which a frame image is formed along a conveying path, a reading means for reading image information of the photographic film, and a reading means for reading the image information. The present invention relates to a frame image specifying device that specifies the position of the edge of the frame image in the direction orthogonal to the transport direction from image information.

[0002]

2. Description of the Related Art Frame images are formed at predetermined intervals on a developed film (corresponding to a photographic film). In printing and exposing the frame image of the film to paper as a photographic photosensitive material, image information of the film is read by a reading means such as a line scanner, and a digital image is exposed and formed on the paper using the read image data. There is something. This prior art will be described with reference to the drawings.

FIG. 5 is a schematic diagram showing the structure of a film transport unit called a negative carrier. The film transport unit includes a transport roller mechanism U including a drive roller 100 and a driven roller 101 along a transport path for transporting the negative film F, and a line sensor 102 (also called a screen detection sensor) for detecting an edge of a frame image. .)
And an opening 105 for allowing the negative film F to face the line scanner 103 and the reading light source 104 arranged along the optical axis, and a pulse motor 106 for driving the driving roller 100.

FIG. 6 shows a schematic external view of a developed negative film F. The frame images I1, I2, I at substantially predetermined intervals
Are formed. Line sensor 10
2 is the edge E of the frame image in the direction orthogonal to the transport path.
1, E2 (either E1 or E2 may be detected) is provided to identify the position of the frame image. The driving roller 100 and the driven roller 101 convey the negative film F while nipping it. Driven roller 101
A pressing force is applied to the drive roller 100 by a spring (not shown). A driving unit 107 for driving the pulse motor 106 is provided.
6 is supplied with a drive pulse P.

Next, the operation will be described. First, the negative film F is transported in the direction of arrow A in FIG. Transport roller mechanism U
The image information of the negative film F is read line by line by the line scanner 103 while the negative film F is transported at a constant speed. This reading is called prescan. The read image information of the negative film F is displayed on a monitor. The operator looks at each displayed frame image and determines whether or not a photographic print can be created by exposure with an appropriate color and density. If it is determined that a proper photographic print cannot be obtained, color and density correction data are input. This work is performed before the frame image is actually exposed on the paper, and is called a pre-judge.

[0006] As described above, the pre-scan is for reading image information of the negative film F in order to perform pre-judgement, and is read with a coarse number of pixels in order to increase the scanning speed. After performing pre-scan,
This time, image information for actually exposing the frame image on the paper is needed, and the image information is different from the pre-scan in order to secure the image quality of the photographic print. Must be read. Reading image information with this small number of pixels is called main scan. The direction of transport of the negative film when performing the main scan is indicated by an arrow B in FIG. (Note that the main scan is the same as the pre-scan
May be conveyed in the direction of arrow A. Also, when the image information of the negative film F is read in the pre-scan, the negative film F including portions other than the frame image is read.
The entire (or almost the entire) image information is read. However, even in the actual scan, if the entire image information on the negative film F is to be read, it is necessary to read the image information with a small number of pixels. It takes time and reduces the photographic processing efficiency. Further, the required capacity of the memory for reading image information with a small number of pixels increases, which is not preferable because it causes an increase in cost.

Therefore, at the time of the main scan, instead of reading the entire image information of the negative film F, only the image information of the frame image is read. In order to read only the image information of the frame image, it is necessary to recognize the edge of the frame image (the edge in the direction orthogonal to the transport direction). Referring to FIG. 6, it is necessary to recognize the positions of the edges E1 and E2 for the frame image I1. That is, when the negative film F is conveyed and the edge E1 (or E2) arrives at the opening 105, reading by the line scanner 103 is started, and when the edge E2 (or E1) arrives at the opening 105, reading is ended. I do. Thereby, only the image information of the frame image I1 can be read.

The positions of the edges E1 and E2 are detected based on information obtained from the line sensor 102 at the time of pre-scanning. The positions of the edges E1 and E2 of the frame image I1 are It is stored as distance information L1, L2 from the end in the longitudinal direction. Actually, the distance information L1, L2 is converted into the number of pulses supplied to the pulse motor 106 and stored. And
When performing the main scan, the number of pulses supplied to the pulse motor 106 is counted, and based on the count value,
The reading start position and the end position of each frame image are controlled.

[0009]

A problem in the above prior art is that a line sensor is provided to detect the position of an edge. Since the image density changes at a predetermined level or more at the edge of the frame image, it is possible to detect the edge of the frame image. However,
Depending on the frame image being formed, there is not always a density difference equal to or higher than a predetermined level at every edge position. Therefore, in order to reliably detect the edge, a line sensor having a detection area that can cover the length of the edge is required, but the cost increases as compared with a normal sensor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to eliminate the need for a line sensor (screen detection sensor) for detecting the edge of a frame image, thereby achieving a cost reduction. It is to provide a specific device.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a frame image specifying apparatus according to the present invention comprises a conveying means for conveying a photographic film on which a frame image is formed along a conveying path, and an image on the photographic film. Reading means for reading information, and a frame image specifying device for specifying the position of the edge of the frame image in a direction orthogonal to the transport direction from the image information read by the reading means, wherein the perforation formed on the photographic film is determined. A perforation detection sensor for detecting, an edge detection unit for detecting the edge from the image information read by the reading unit, a perforation signal output from the perforation detection sensor, and the edge detected by the edge detection unit. Of the edge of the image information based on the correspondence relationship of It is characterized in that a specific edge position specifying means.

The operation and effect of this configuration are as follows. First, a perforation sensor for detecting perforations formed on a photographic film and outputting a perforation signal is provided. Photographic film
The sheet is conveyed along a conveying path by a conveying unit, and a perforation signal is output in conjunction with the conveyance of the photographic film. Further, while conveying the photographic film, the image information of the photographic film is read by the reading means.

After the image information of the photographic film is read, the edge position specifying means determines the frame image from the correspondence (relative positional relationship) between the edge detected by the edge detecting section and the perforation signal from the perforation sensor. The position of the edge of. For example, as shown in FIG. 6 which describes the related art, the position of a frame image can be specified by the number of pulses of a perforation signal corresponding to distance information from an edge of a photographic film to an edge.

Further, since the edge detector detects the edge from the image information, a line sensor which is a dedicated sensor for detecting the edge as in the prior art is not required. Further, reading of image information is inevitably performed for performing processing such as pre-scanning, and is not performed only for the purpose of edge detection. As a result, it is possible to provide a frame image specifying device capable of eliminating the line sensor (screen detection sensor) for detecting the edge of the frame image and achieving cost reduction.

In a preferred embodiment of the present invention, the edge position specifying means is configured to determine the position of the edge based on the number of pulses of the perforation signal corresponding to a distance from a reference position on the photographic film to the position of the edge. Are specified.

According to this configuration, the position of the edge is specified based on the number of pulses of the perforation signal corresponding to the distance from the reference position to the position of the edge in the photographic film. Since there is a reference position on the photographic film, the position of the edge can be specified with high accuracy.

The reference position is preferably an end in the longitudinal direction of the photographic film. By calculating the distance information from the end (corresponding to L1 and L2 in FIG. 6) to the number of pulses of the perforation signal,
The position of the edge can be reliably specified. This end may be the leading end or the trailing end of the photographic film in the longitudinal direction.

As another preferred embodiment of the present invention, a drive motor for transporting the photographic film along the transport path, and a motor drive unit for supplying a drive pulse to the drive motor are provided, and the edge position identification is performed. Means for specifying the position of the edge based on the number of pulses of the perforation signal corresponding to distance information from the reference position on the photographic film to the position of the edge, and the number of pulses of the driving pulse. Can be

Since the pulse interval of the pulse signal obtained from the above-described perforation detection sensor is usually relatively long, if the above-mentioned distance information is set only based on the perforation signal from the perforation detection sensor, the accuracy as the distance information is reduced. Could be Therefore, since the pulse interval of the drive pulse supplied to the drive motor is usually set to be short, the pulse interval of the drive pulse is usually shorter than the pulse interval of the perforation signal output from the perforation sensor. Therefore, if the position of the edge is specified based on both pulse numbers, the edge can be specified with high accuracy.

In still another preferred embodiment of the present invention,
The distance information includes first distance information determined by the number of pulses of the perforation signal, and second distance information determined by the number of pulses of the drive pulse, such that the second distance information is the shortest. The number of pulses of the perforation signal is determined.

The distance information between the reference position and the edge position is expressed as
When represented by first distance information determined by the number of pulses of the perforation signal and second distance information determined by the number of pulses of the driving pulse (distance information = first distance information + second distance information), There are many combinations. However, when the proportion of the second distance information increases, the influence of the slip of the photographic film (this will be described in detail in the embodiment) appears, so that the position of the frame image cannot be specified accurately. Therefore, by determining the number of pulses of the perforation signal so that the second distance information becomes the shortest, the influence of the slip of the photographic film can be reduced to a negligible level. Accordingly, it is possible to provide a frame image specifying device capable of specifying the position of the frame image with high accuracy.

[0022]

Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a photo processing system having a function as a frame image specifying device according to the present invention.

This system is roughly composed of an image processor I and a printer processor P. The main function of the image processor I is to read image information from an image forming medium such as a negative film F (corresponding to a photographic film).

The image processor I corresponds to a negative carrier 1 as a transport unit for transporting the negative film F, and a line scanner 2 (reading means) for reading image information of the negative film F mounted on the negative carrier 1. ), Reading lens 3 and reading light source 4
A scanner driver 5 for driving the line scanner 2, a motor driver 6 for driving a motor in the negative carrier 1, and an edge position specifying unit 7 for specifying an edge position of a frame image formed on the negative film 1. When,
The image processing apparatus includes a keyboard 8, a monitor 9, and a first controller 10 for controlling operation of each part of the image processor I.

The structure of the negative carrier 1 will be described later. Along the optical axis, a line scanner 2 and a reading lens 3
And a reading light source 4 are arranged, and while the negative film F is transported at a predetermined speed by the negative carrier 1,
The image information of the negative carrier F is read line by line.

The edge position specifying section 7 includes an image information storage section 7
a, an image processing unit 7b, and an edge detection unit 7c. The image information storage unit 7a stores the image information read by the line scanner 2 as A / D converted digital data. The image processing unit 7b performs image processing on the obtained image information, and the edge detection unit 7c
Detects the edge of the frame image based on the image data subjected to the image processing.

The printer processor P is a device for creating a photographic print based on the image information read by the image processor I. The printer processor P includes an exposure head 11 for exposing and forming a digital image on paper 12 (corresponding to a photosensitive material).
And a paper magazine 13 in which the long paper 12 is accommodated in a roll shape, a developing unit 14 for developing the exposed paper 12, and the developed paper 1
And a second controller 16 for controlling the operation of each part of the printer processor P.
And The first controller 10 and the second controller 16 are connected by communication means.

The exposure head 11 has a PLZT engine, C
RT engine, laser engine, DMD (digital
Any digital engine such as a mirror device) engine can be employed.

<Structure of Negative Carrier> FIG. 2 schematically shows the structure of the negative carrier 1. In negative carrier 1,
The negative film F is configured to be transported along a predetermined transport path. The insertion position of the negative film F
The negative film F is conveyed in the direction of arrow A when performing the pre-scan, and is conveyed in the direction of arrow B when performing the main scan.

Along the transport path, the transport roller mechanism 22,
The transport roller mechanism 22 includes a driving roller 20 and a driven roller 21. The same applies to the transport roller mechanism 23. The drive roller 20 is connected to a pulse motor 24 (stepping motor) as a drive motor. When a driving pulse is supplied from the motor driver 6, the pulse motor 24 is driven to rotate the driving roller 20. The driven roller 21 has a pressing force applied to the drive roller 20 by a spring (not shown), and conveys the negative film F in a state where the drive roller 20 and the driven roller 21 sandwich the negative film F.

Further, a first sensor 26, a second sensor 27, and a third sensor 28 are provided on the transport path. The first sensor 26 detects that the negative film F
When the first controller 10 recognizes the insertion of the negative film F, the pulse motor 24 is started and rotated to convey the negative film F along the conveyance path.

The second sensor 27 is a sensor for detecting that the leading end of the negative film F has come. When the leading end of the negative film F is detected by the second sensor 27, the position of the negative film F is used as a reference. After the film F has been conveyed by a predetermined amount, reading by the line scanner 2 is started. At the time of the pre-scan, the timing at which the leading end of the negative film F arrives at the gate position 29 corresponding to the optical axis position of the line scanner 2 in order to read the entire image from the leading end to the trailing end of the image information of the negative film F Need to start reading. Since the distance relationship between the second sensor 27 and the gate position 29 is determined by the structure of the negative carrier 1, the negative film F is conveyed by a predetermined amount after the second sensor 27 detects the leading end of the negative film F. And the head of the negative film F is at the gate position 29.
Can be determined to have been reached. The transport amount can be set by the number of drive pulses supplied to the pulse motor 24.

The third sensor 28 is a perforation detection sensor for detecting perforations formed on the negative film F. When the negative film F has been conveyed and its leading end has reached the position of the third sensor 28, the loading of the perforation signal is started.

<Description of Prescan Operation> Next, the prescan operation will be described with reference to the flowchart of FIG. First, the negative film F is inserted from the right side of FIG.
1). When the negative film F is inserted, the tip is moved to the first position.
It is detected by the sensor 26 (# 2). Thus, the pulse motor 24 is driven (# 3). Pulse motor 24
The negative film F is conveyed in the direction of arrow A in FIG. The tip of the negative film F is the second sensor 27.
, The leading edge of the negative film F is detected (# 4).

After the end of the negative film F is detected,
When a predetermined number of drive pulses are supplied to the pulse motor 24, scanning by the line scanner 2 is started (# 5). When scanning starts, the leading end of the negative film F has just reached the gate position 29. Alternatively, the scanning may be set to start slightly before the gate position 29. Thus, while the negative film F is transported at a constant speed by the transport roller mechanism 22, the image information of the negative film F is read line by line by the line scanner 2. This reading is a pre-scan. When reading the image information of the negative film F, not only the frame image portion but also portions other than the frame image are continuously read. That is, image information is read over the entire length of the negative film F in the longitudinal direction. However, in the width direction of the negative film F, it is not necessary to read the image information for the entire width, but it is sufficient to read the image information for a width that can cover the size of the frame image.
Perforations P on both sides of the frame image area in the width direction
Although e (see FIG. 4) is formed, it is not necessary to read the image information of the area of the perforation Pe. This is because the signal from the perforation Pe is taken in by the third sensor 28. Thereby, the memory capacity of the image information storage unit 7a for storing the read image information can be reduced, and the cost can be reduced.

Simultaneously with the start of image capture, the capture of a perforation signal from the perforation Pe is started (# 6). That is, the timing to start reading the image information is synchronized with the timing to capture the perforation signal from the third sensor 28. Thereafter, the image information of the negative film F is sequentially read. The read image information is A / D converted and stored in the image information storage unit 7a.

Next, when the rear end of the negative film F is detected by the first sensor 26, the reading of the image information of the negative film F is stopped after the negative film F is conveyed by a predetermined amount after the detection of the rear end ( # 8). The reading is stopped immediately after the rear end of the negative film F passes through the gate position 29. After the reading is stopped, the transport of the negative film F is also stopped. When the transport is stopped, sudden stop may cause a slip, so it is preferable to stop the transport while gradually reducing the speed.

The read image information of the negative film F is displayed on the monitor 9. The operator looks at each displayed frame image and determines whether or not a photographic print can be created by exposure with an appropriate color and density. If it is determined that a proper photographic print cannot be obtained, color and density correction data are input. This operation is performed before the frame image is actually exposed on paper, and is called a pre-judge (# 9).

As described above, the pre-scan is for reading image information of the negative film F in order to perform a pre-judgement, and is read with a coarse number of pixels in order to increase the scanning speed.

<Procedure for Specifying Edge> Next, the edge of the frame image is specified (# 10). FIG. 4 shows the correspondence (relative positional relationship) between the read image information of the negative film F, the perforation signal P1 from the third sensor 28, and the drive pulse P2 to the pulse motor 24. These relative positional relationships are stored in the information storage unit 7a in association with each other. The timing of reading the image information and the timing of taking in the perforation signal P1 are synchronized, and the signal from the sensor does not change from the start of the reading of the image information until the leading edge of the film reaches the perforation detection sensor. State. As can be seen from FIG. 4, the pulse interval of the perforation signal P1 is longer than the pulse interval of the drive pulse P2 (the period is longer).

First, the edge E1 of the frame image I as shown in FIG. 4 is detected. This edge E1 is a negative film F
In the direction orthogonal to the transport direction (longitudinal direction). The image data stored in the image information storage unit 7a is subjected to image processing by the image processing unit 7b, and edges are detected by the edge detection unit 7c based on the image data subjected to the image processing. More specifically, since the density of the image at the edge E1 is rapidly changing, the edge is detected by performing image processing paying attention to this feature. When the edge E1 is detected, the pixel (line number) of the edge E1 from the leading edge (or the trailing edge) of the negative film F can be determined.
This number of pixels corresponds to distance information LA (or LB) from the front end (or rear end).

Since the scanning time of the line scanner 2 in the line direction (main scanning direction) is determined, the distance information from the leading or trailing end to the position of the edge E1 can be converted into time. In addition, the pulse motor 24
Since the frequency of the drive pulse (へ pps = 秒 pulse / sec) is also determined, the distance information LA (LB) can be converted into the number of drive pulses.

Here, as shown in FIG. 4, the number of drive pulses corresponding to the entire length of the negative film F is X pulses, and the number of drive pulses corresponding to the distance between the edge E1 and the leading end of the negative film F is Y pulses. I do. The number of drive pulses corresponding to the distance between the edge E1 and the rear end of the negative film F is XY pulses. On the other hand, the drive pulse P2 and the perforation signal P1 from the third sensor 28 are related and taken in. Therefore, the number of pulses of the perforation signal P1 corresponding to the Y pulse and the XY pulse can be obtained. After all, the distance information LA (L
The pulse number N of the perforation signal P1 corresponding to B) is obtained. However, since the pulse interval of the perforation signal P1 is coarse, if the distance to the edge E1 is determined only by the perforation number N, an error increases.

Focusing on the fact that the pulse interval of the drive pulse P2 is small, the distance information to the edge is represented by the pulse number N of the perforation signal P1 (corresponding to the first distance information) and the pulse number of the drive pulse P2. M (second distance information). Here, many combinations of the pulse numbers N and M can be considered, but the combination is determined so that the pulse number M becomes the smallest (the second distance information becomes the shortest). This is the number of pulses M
Is set to be large, the negative film F and the drive roller 20
This is because the effect of the slip between the edge E1 and the edge E1 appears, so that the reliability of the position information of the edge E1 decreases.

As described above, the edge E of the frame image I
The position of 1 is obtained by the combination data of the pulse number N + M and stored. Since the frame image I has an edge E2 in addition to the edge E1, the edge E2 is similarly obtained. Hereinafter, the position of the edge is specified for each frame image.

<Explanation of the Main Scan Operation> After the pre-scan is performed, image information for actually exposing the frame image to the paper is necessary. The image information is used to secure the image quality of the photographic print. Unlike prescan, image information must be read with a small number of pixels.
Reading image information with this small number of pixels is called main scan. The transport direction of the negative film F when performing the main scan is indicated by an arrow B in FIG. (Note that
The main scan may be performed by transporting the negative film F in the direction of the arrow A as in the prescan. In the pre-scan, when the image information of the negative film F is read, the entire (or almost the entire) image information of the negative film F including the portion other than the frame image is read. In this case, if it is desired to read the entire image information of the negative film F, it is necessary to read the image information with a small number of pixels, so that it takes a long time for scanning and reduces the photographic processing efficiency. Further, the required capacity of the memory for reading image information with a small number of pixels increases, which is not preferable because it causes an increase in cost.

Therefore, at the time of the main scan, the image information of the frame image is read instead of reading the entire image information of the negative film F. In order to read only the image information of the frame image, it is necessary to recognize the edge of the frame image (the edge in the direction orthogonal to the transport direction) as described above in step # 10 of FIG. The line scanner 2 is controlled based on the pulse numbers N and M stored in the image information storage unit 7a.
That is, when the negative film F is transported and the edge E1 (or E2) arrives at the gate position 29, the reading by the line scanner 2 is started, and when the edge E2 (or E1) arrives at the gate position 29, the reading ends. I do. Thereby, only the image information of the frame image I1 can be read.

More specifically, the third sensor 28 is set with the front end (or the rear end) of the negative film F as a reference position.
When the perforation signal P1 is output by N pulses and the drive pulse P2 is supplied by M pulses, the reading of the line scanner 2 is controlled (end of reading). Here, the third sensor 28
Is a signal that is not affected by the slip of the negative film F. This will be described below.

That is, when the negative film F is transported by the drive roller 20, slippage may occur between the drive roller 20 and the negative film F, and the amount of drive of the drive roller 20 (the number of drive pulses And the transport amount of the negative film F may not correspond one-to-one. That is, even if a predetermined number of drive pulses are supplied to the pulse motor 24 in order to transport the negative film F by a predetermined transport amount, the negative film F may not be transported by the transport amount corresponding to the pulse number. In this case, if the reading start position and the ending position of the image information are controlled only by the number of drive pulses, an error occurs, and the quality of the photographic print to be created is reduced. In particular, the longer the distance information LA (or LB) shown in FIG. 4 is, the higher the probability of occurrence of slip and the greater the error.

In the configuration according to the present invention, the third perforation signal which outputs a perforation signal in conjunction with the transport of the negative film F is provided.
A sensor 28 is provided. The negative film F is conveyed while being sandwiched between the drive roller 20 and the driven roller 21. The detected perforation signal is linked to the movement of the negative film F, and the negative film F Is not conveyed, no perforation signal is output. Therefore, since the perforation signal and the transport amount of the negative film F correspond one-to-one, the pulse number of the perforation signal output from the third sensor 28 and the transport amount of the negative film F correspond one-to-one. As a result, information that is not affected by slip can be obtained from the third sensor 28.

Then, based on the image information read in the main scan, a photographic print is exposed and created by the exposure head 11 in the printer processor P.

<Another Embodiment> (1) The waveform of the output perforation signal (pulse signal) is not particularly limited. (2) In the present embodiment, the edge is specified at two positions in one frame image, but either one may be specified. This is because the size of the frame image is determined by a standard or the like, and if one edge position is known, the other edge position can be estimated. (3) A photographic film may be a positive film other than a negative film.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a photo processing system.

FIG. 2 is a schematic diagram showing a configuration of a negative carrier.

FIG. 3 is a flowchart showing a procedure of a prescan.

FIG. 4 is a diagram showing a correspondence relationship between image information of a negative film, a perforation signal, and a driving pulse.

FIG. 5 is a diagram showing a configuration of a conventional negative carrier.

FIG. 6 shows a developed negative film.

[Explanation of symbols]

2 Line Scanner 7 Edge Position Identifying Unit (Edge Position Identifying Unit) 7c Edge Detecting Unit 20 Drive Roller 22 Conveying Roller Mechanism 24 Pulse Motor 28 Third Sensor (Perforation Detection Sensor) E1, E2 Edge F Negative Film P1 Perforation Signal P2 Drive Pulse

Claims (5)

[Claims] 1. A conveying means for conveying a photographic film on which a frame image is formed along a conveying path, a reading means for reading image information of the photographic film, and a conveying direction from the image information read by the reading means. A frame image specifying device that specifies the position of the edge of the frame image in a direction perpendicular to the direction of the frame image, comprising: a perforation detection sensor that detects perforations formed on the photographic film; and detecting the edge from image information read by the reading unit. An edge detection unit for detecting, a perforation signal output from the perforation detection sensor, and an edge position for specifying the position of the edge of the image information based on a correspondence relationship with the edge detected by the edge detection unit Frame image feature, comprising: Apparatus. 2. The method according to claim 1, wherein the edge position specifying unit specifies the position of the edge based on the number of pulses of the perforation signal corresponding to a distance from a reference position on the photographic film to the position of the edge. The frame image specifying apparatus according to claim 1, wherein 3. A reference position in the photographic film,
3. The frame image specifying apparatus according to claim 2, wherein the frame is an end in a longitudinal direction of the photographic film. 4. A drive motor for transporting the photographic film along the transport path; and a motor drive unit for supplying a drive pulse to the drive motor, wherein the edge position specifying means includes a reference position in the photographic film. 2. The frame according to claim 1, wherein the position of the edge is specified based on the number of pulses of the perforation signal corresponding to distance information from the edge to the position of the edge and the number of pulses of the drive pulse. 3. Image identification device. 5. The distance information includes first distance information determined by the number of pulses of the perforation signal, and second distance information determined by the number of pulses of the drive pulse, wherein the second distance information is 5. The apparatus according to claim 4, wherein the number of pulses of the perforation signal is determined so as to be the shortest.