JPH01245234A - Method for deciding frame number of photographic film - Google Patents

Abstract

PURPOSE:To accord a frame number read from its bar code with a photographed frame by extracting a frame number in the area where a movable position is in a fixed range at the time of positioning and deciding the frame number to be the same number in a negative mask. CONSTITUTION:A pulse is started counting at the time of reading the bar code 3 for the frame number, and the movable position of the read bar code 3 for the frame number or its corresponding frame number 5 is measured. An image plane detecting means 8 detects frame edges 9a and 9b, controls feeding of a photographic film in order to bring the edges 9a and 9b to the prescribed location and positions the frame in the center of the negative mask 7. The distance from a bar code sensor 6 to the center of the negative mask 7 is set as the standard, and the number of the frame moving to an area set around the standard is extracted. Therefore, the number of the frame set in the negative mask is decided accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for determining frame numbers of photographic film, and more particularly to a photographic printing apparatus and a negative verification apparatus.

The present invention relates to a method used in a frame number printing device to automatically determine the number of a frame located on a negative mask.

[Conventional technology]

A disc-shaped disc film is already on the market, but in this disc film, a frame number using arithmetic numerals and a binary bar code are recorded next to each frame arranged at a fixed pitch. There is. This disc film printing system uses a sensor to read a binary barcode and prints this frame number on the back of the printed photo.

Additionally, when making reprints, if you input the number of reprint frames to be printed on the keyboard, the system automatically sets the reprint frames at the print position by reading the binary barcode, and prints the number of copies entered on the keyboard. .

In this disc film, since the recording position of the image is specified, the photographed frames and frame numbers accurately correspond. However, with roll film, such as 135 size negative film, the recording position of the frame changes depending on how it is loaded into the camera, so the positional relationship between the frame number of the arithmetic numerals recorded at the time of film manufacture and the photographed frame is different. Failure to do so will result in various inconveniences. For example, when reordering photo printing, it is necessary to identify the extra print frame by comparing the simultaneously printed photo and the negative film, and to check the frame number by observing both sides of the identified frame.

Therefore, in order to easily confirm the frame numbers, there is known an apparatus that records frame numbers on printed photographs during simultaneous printing. For example, JP-A-56-12893
In No. 3, a mark is recorded at the start frame of the negative film, and after detecting this mark, the amount of transfer of the negative film is measured, the number of the frame on the negative mask is determined from this amount of transfer, and this frame number is displayed on the screen. It describes a device that prints in the white frame around it or prints on the back side.

Additionally, there has been proposed a device that reads the frame number with an image identification means when making extra prints, determines the designated extra print frame, sets it on a negative mask, and prints the required number of extra prints (for example, in Japanese Patent Application Laid-Open No. (Sho 52-111718).

The above-described method using marks requires a start mark to be attached before printing, and a method that reads frame numbers has the problem that the reading device becomes complicated. This kind of problem can be solved by side-printing the barcode for the frame number at the time of manufacturing the negative film, maintaining a certain positional relationship with the frame number, and using a sensor placed on the path of the negative film. This can be solved by reading the frame number barcode.

[Problem to be solved by the invention]

However, if the frame number barcode is printed on the side, it will be easier to read, but as mentioned above, the photographed frame and the frame number barcode do not correspond, so it is necessary to make the correspondence. Become.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for determining a frame number of a photographic film, which allows a frame number read from a frame number barcode to be associated with a photographed frame.

[Means to solve the problem]

In order to achieve the above object, the present invention arranges a barcode sensor at a certain distance from the negative mask, reads the frame number barcode recorded on the barcode when transporting the photographic film, and reads the barcode inside the negative mask. In the method for determining the frame number described in , the measurement of the transport amount of the photographic film is started in synchronization with the reading of the frame number barcode, and the frame number barcode or frame number is determined with the position of the barcode sensor as the origin. In addition to measuring the movement position, the frame (screen) is detected by a screen detection means, and when this frame comes to the center of the negative mask, the photographic film is automatically stopped and the frame is positioned. Frame numbers within a certain range are extracted, and these are determined to be the frame numbers of frames within the negative mask.

The screen detection means detects the position of a frame from the edge of the screen, and uses an image area sensor or a line sensor. In the case of an image area sensor, it is placed so as to look directly at the print position and detects edges on both sides of the frame. In the case of a line sensor, it is placed upstream of the negative mask along a direction perpendicular to the transport direction of the photographic film, and detects frame edges. Further, in order to determine the exposure amount with high precision, it is preferable to use an image area sensor that measures the density of each point of the frame.

The amount of transport of the photographic film can be measured by counting the drive pulses of a pulse motor or the pulses of a rotary encoder connected to a roller that rotates in accordance with the drive pulses. Alternatively, a counter may be provided to count the number of perforations, and the transfer amount may be measured based on the number of perforations and the number of pulses.

[Effect]

In the present invention, pulse counting is started when reading the frame number barcode, and the movement position of the read frame number barcode or the corresponding frame number is measured.

On the other hand, the screen detection means detects the edge of the frame, controls the advance of the photographic film so that the edge is at a predetermined position, and positions the frame at the center of the negative mask. and,
After this positioning, the distance between the barcode sensor and the center of the negative mask is used as a reference, and frame numbers that have moved within a set range before and after that are extracted.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

〔Example〕

FIG. 1 shows the relationship between a negative film and a sensor. A frame number barcode 3 is printed on one side of the negative film 2, and a well-known DX code 4 is printed on the other side, and on both sides of the negative film 2,
Frame number 5 is also printed. Barlow for these frame numbers) '3. DX code 4. Frame number 5 is recorded as a latent image during the production of negative film, and is visualized by photographic development.

A barcode sensor 6 is arranged at a certain distance from the center of the negative mask 7, and when the negative film 2 is transported in the direction of the arrow, the frame number barcode 3 is detected.
is read. An appropriate barcode sensor 6 is used depending on the type of frame number barcode 3 to be used.

For example, a single light-receiving element arranged in the transport direction of the negative film 2 or a line sensor in which a plurality of light-receiving elements are arranged in a line is used. In the case of this line sensor,
Each light-receiving element is arranged so as to be shifted by the minimum width of the bar, and difference signals between adjacent light-receiving elements are determined, and each of the obtained difference signals is input to a window comparator to detect the edge of the bar. In addition, when the number of light receiving elements is one, it is also possible to determine whether the width of the bar is wide or narrow by referring to the feed amount of the negative film 2.

Furthermore, as will be described later, the start mark of the frame number barcode 3 is side-printed to match the start mark of the DX code 4, which indicates the type of negative film 2, so the clock track of the DX code 4 cannot be used. It is also possible to use it to import data. Furthermore, the frame number barcode 3 may be read while the negative film 2 is being transported or may be read while the negative film 2 is stopped. In addition, if a DX sensor for reading DX code 4 is placed on the film path, two sensors with light receiving elements arranged in 2 rows and 2 columns are installed to enable common use with this sensor. This may be used on one side of the negative mask 7 and on the path on both sides of the negative film 2, or four sensors may be placed on both sides of the negative mask 7.

An image area sensor 8 is arranged so as to stare at the negative mask 7, and detects the edges 9a and 9b of the frame (screen).
It is detected whether or not the negative mask 7 is at a predetermined position. In this embodiment, the image area sensor 8 is used not only as a screen detection sensor but also as a scanner that measures light at each point of a frame for exposure control. In addition, a line sensor is used as a screen detection sensor, and this line sensor is placed on the path of the negative film 2, for example near the barcode sensor 6, so as to be orthogonal to the transport direction of the negative film 2, and this line sensor detects the frames. The amount of transfer of the negative film 2 is measured from the time when one edge is detected, and when this edge has been transferred by the distance between the position where it is to be positioned on the negative mask 7 and the line sensor, the feed of the negative film 2 is determined. The frame including this edge may be positioned on the negative mask 7 by stopping the frame.

FIG. 2 shows an example of a frame number barcode. Various types of barcodes have been proposed so far, and any of them can be used in the present invention. For example, as a binary level, Interleav
ed 2 of 5+ Industrial 2
There are 5 of 5, Code 3 of 9, and multi-level ones such as IJPC.

In this example, rC as data bit 3a.

de 3 of 9 J is used. This data bit 3a is composed of five barcodes, and a start mark 3b and an end mark 3C are attached to both sides of the barcode so that the most significant bit and the least significant bit can be identified. In this rCode 3 of 9 J, white background and bars are arranged alternately, and the wide one represents the binary digit "1" and the narrow one represents the binary digit "0". Note that since this rCode 3 of 9 J is not a binary representation, it is not possible to distinguish between even and odd numbers in the decimal system from the least significant bit.

In the example of the frame number barcode shown in the figure, data bit 3
If a is expressed as a binary digit, it becomes rooloololJ, and this binary code corresponds to "24" in the decimal system.

The frame number barcode (expressed in decimal notation for convenience) and the frame number correspond, for example, as follows.

Red frame number barcode (decimal system) Frame number Also, the length A of the frame number barcode 3 and the length B from the center of frame number 5 to the start mark 3b are constant. Therefore, the distance C from the frame number 5 to the end mark 3c is also constant.

Further, as shown in FIG. 1, the pitch of the frame number barcode 3 and the pitch of the frame number 5 are also constant.

In FIG. 1, when the barcode sensor 6 reads the frame number barcode 3, it writes it into the memory and at the same time starts measuring the amount of negative film 2 transported in synchronization with this reading. By measuring the amount of movement of the negative film 2, it is possible to know how far the frame number barcode 3 has moved from the position of the barcode sensor 6. Here, the transfer amount of the negative film 2 is determined based on the start mark 3b or the end mark 3c. In the case of the start mark 3b, length B is added, and in the case of the end mark 3c, length C is added. By adding , the moving position of frame number 5 can be known. In this embodiment, the distance between the barcode sensor 6 and the center of the negative mask is set to about two and a half frames, so the moving positions of five frame numbers are measured at the same time.

On the other hand, the image area sensor 8 detects, for example, the positions of the edges 9a and 9b of the frame 2a, respectively, and stops the transfer of the negative film 2 when these edges reach predetermined positions with respect to the negative mask 7.

Thereby, the frame 2a is correctly positioned within the negative mask 7. After positioning this frame 2a, select a certain distance 21 before and after the center of the negative mask 7 among the 5 frame numbers.
By examining what exists within the interval l, it is possible to know the frame number of the positioned frame 2a. This can be done by checking the frame numbers whose movement distance is within the range of L1 to L2.

The section l needs to be set slightly longer than the pitch of frame number 5 and less than the length of the screen. If two frame numbers are extracted, the one with the smaller frame number or the one without "A" is selected. Alternatively, the one whose movement amount is closer to the distance to the center of the negative mask may be selected. Note that if the interval l is set to the length of the screen,
It is necessary to change the length of section l between full size and half size. Furthermore, when measuring the moving position of the frame number barcode 3, the frame number of the barcode on the right side of the center of the negative mask will be closer to the center of the negative mask, and the one on the left side will be farther from the center of the negative mask. Therefore, for example, when measuring the position of the end mark 3C,
The range to the right of the center of the negative mask needs to be widened by length C.

FIG. 3 shows a photographic printing apparatus embodying the present invention. The white light emitted from the light source 12 is passed through a cyan filter 13 . Magenta filter 14; Yellow filter 15
After passing through, it enters the diffusion box 16. These color filters 1
3 to 15, the amount of insertion into the optical path 18 is adjusted by the filter adjustment section 17, thereby adjusting the quality and quantity of the printing light. The diffusion box 16 is a rectangular cylinder whose inner surface is a mirror surface, with diffusion plates attached to both ends thereof, and sufficiently diffuses the printing light that has partially passed through the color filters 13 to 15.

A negative carrier 20 is placed at a printing position, a negative film 2 is set thereon, and the negative carrier 20 is illuminated with light transmitted through a diffusion box 16. This negative film 2 is fed frame by frame in the arrow direction by a pair of feed rollers 21 and 22 arranged on both sides of the printing position. This feed roller pair 21.22
are interlocked by a belt or the like, and are rotated forward or reverse by a pulse motor 23. In order to ensure the flatness of the negative film 2, a negative mask 7 is provided above the printing position. As is well known, this negative mask 7 has frame 2
An opening larger than the size a is formed, and when the negative film 2 is transferred, it is lifted up by a solenoid (not shown), and the negative film 2 is pressed down during printing.

A barcode sensor 6 is arranged next to the feed roller pair 22, and an image area sensor 8 is arranged diagonally above the printing position. Further, a printing lens 26 is arranged above the print position, and the negative image of the frame set at the print position is enlarged and formed on photographic paper 27.

A shutter 29 whose opening and closing are controlled by a shutter drive section 28 and a photographic paper mask 30 are arranged between the printing lens 26 and the photographic paper 27. The photographic paper 27 is pulled out one frame at a time from the photographic paper roll 31, and the photographic paper 27 is pulled out frame by frame from the photographic paper roll 31.
After passing through step 2, it is set to the exposure position. The exposed portion is then sent to a development processing device 36 by a pair of pull-out rollers 34 driven by a pulse motor 33. The exposed photographic paper that has been photographically processed is cut frame by frame by a cutter 37 and discharged onto a tray 38.

A printing device 40 is arranged next to the exposure position,
It is driven by a signal from the controller 41, and prints the same number as frame number 5 of the negative film 2 on the back side of the exposed photographic paper 27, for example, in a dot pattern. This printing device 40
Instead, a character inserter composed of a liquid crystal panel, a light emitting diode array, or the like may be attached to the photographic paper mask 30, and the frame number of a dot pattern, for example, may be printed into the white frame at the same time as printing the negative image.

The rotation direction and rotation amount of the pulse motors 23 and 33 are controlled by a controller 41 via drivers 42 and 43. Further, this controller 41 is composed of a microcomputer, and includes a filter adjustment section 17. In addition to controlling the shutter drive unit 28 and the like, it also controls the transfer of the negative film 2 and performs calculations for exposure. On the keyboard 45,
Color key 46 for inputting color correction data. Density key 47 for inputting density correction data. 4. Alphanumeric keys for inputting print data manually; 4. Print start key for starting printing; 49. A bus key 50 is provided for skipping the frames.

FIG. 4 shows a part of the controller that reads and prints frame numbers.

The signal output from the barcode sensor 6 is sent to the sofa memory 51, where it is stored.

The data stored in this buffer memory 51 is converted into binary numerical data by a decoder 52, and then stored in the memory 51.
Sent to 3. The memory 53 includes a plurality of, for example, five frame number storage sections 54a to 54e and corresponding drive pulse number storage sections 55a to 55e. Before writing new numerical data to the storage section 54a, the frame number storage sections 54a to 54e sequentially shift the already written numerical data upward one line at a time. Further, the drive pulse number storage units 55a to 55e are for storing the number of drive pulses corresponding to the moving distance of frame number 5, and each time a drive pulse is passed through the driver 42 by one, "1" is added to the number of drive pulses. will be updated. Therefore, this drive pulse number storage section 55
a to 55e substantially constitute a frame number counter. In this embodiment, in order to start storing the count value of drive pulses when the barcode sensor 6 detects the end mark 3c, the number of drive pulses corresponding to the length "C" shown in FIG. 2 is preset. value, and "1" is added to it sequentially. Further, this drive pulse number storage section 55a~
55e moves up one line at a time at the same time as the frame number storage section 54a is shifted.

Note that since the frame number barcode 3 is recorded at a constant pitch and the positional relationship with the frame number 5 is also constant, the memory 53 is stored for one line, for example, in the frame number storage section 54a.
It is also possible to provide only the drive pulse number storage section 55a. In this case, the latest numerical data and the number of driving pulses representing the position of this data are memorized, and the number of driving pulses corresponding to the pitch of the frame number barcode 3 is added to this.
On the other hand, by adding "1" to the numerical data, the position of each frame number on the negative mask 7 side can be checked.

The determination unit 56 determines whether the drive pulse stored in the memory 53 is within a certain range when a frame of the negative film 2 is set at the print position, reads out numerical data corresponding to this, and stores it in the memory 57. write to. The numerical data written in this memory 57 is decoded by a decoder 58, converted to frame number 5, and then sent to the printer 40.

The printing device 40 is driven when the exposed portion is set on the printing device 40 after feeding of the photographic paper 27, and prints frame number 5 on the back side of the photographic paper 27.

The image area sensor 8 includes a large number of pixels arranged in a matrix as is well known, and converts light incident on each pixel into an electrical signal and stores the electrical signal. The signal charges accumulated in these pixels are read out at a predetermined period and output as a time-series signal. This time series signal is
In the A/D converter 60, the image area sensor 8
It is converted into a digital signal at a timing synchronized with the reading of the data. This digital signal is converted into a concentration signal (strictly speaking, a value proportional to the concentration value) by a logarithmic converter 61 and then sent to a comparator 62 .

The unexposed portions have a base density, and the exposed frame portions have a high density. Therefore, frames can be detected by checking the density value measured by the image area sensor 8. For this purpose, a comparator 62 thresholds a density value slightly higher than the base density.
is provided to binarize the density signal at each point of the frame output from the logarithmic converter 61. This binary data is written into the frame memory 63. Writing to this frame memory 63 is performed periodically in synchronization with reading from the image area sensor 8. Also, the area surrounded by hatching represents the frame.

The determination unit 64 reads one line of binary data from the frame memory 63 and determines the edge 9a of the frame.

9b and these edges 9a.

9b, that is, the center position of the frame is calculated.

Frames shot with flash may have missing edges, so multiple lines (for example, three in the center and three at the top and bottom) may be missing.
It is better to determine the center position with respect to Then, when the center position of the frame coincides with the center position PL of the frame memory 63, the transport of the negative film 2 is stopped. Further, in order to decelerate and stop the pulse motor 23, the pulse motor 23 starts decelerating when the leading edge 9a reaches a predetermined position on the frame memory 63, for example, the center position PL.

When the print end signal is input, the motor control circuit 65 generates a signal indicating the rotation direction and sends the signal to the driver 4.
Send to 2. At the same time, a drive pulse with a constant period is generated to drive the driver 42 and the drive pulse counters 55a to 55.
Send to 5e. The motor control circuit 65 also includes a determination unit 64
When a deceleration command is output from , the period of the drive pulse is increased to cause the pulse motor 23 to rotate at a reduced speed.

The image area sensor 8 is used for photometry for exposure control after positioning the frame. In this case, the density signal is sent to the characteristic value extraction section 67, where the maximum density value, minimum density value, density value of a specific area, etc. are extracted for each color, and these characteristic values are sent to the exposure amount calculation section 68. sent to. The exposure calculation unit 68 calculates the exposure amount for each color using the LATD value measured by an LATD sensor (not shown) provided for each color and each characteristic value described above.

Next, the operation of the above embodiment will be explained with reference to FIG. When the pass key 50 is operated after setting the negative film 2 on the negative carrier 17, the pulse motor 23 rotates normally and transports the negative film 2 in the direction of the arrow. During this transfer, the barcode sensor 6 reads the frame number barcode 3 side-printed on the negative film 2 and writes the obtained signal into the buffer memory 51. The data temporarily stored in the buffer memory 51 is converted into numerical data by the decoder 52, and then written into the frame number storage section 54a. In synchronization with this reading, the drive pulse number storage section 55a starts counting drive pulses.

When the barcode sensor 6 reads the barcode 3 for the next frame number, the numerical data stored in the frame number storage section 54a is shifted to the frame number storage section 54b above it, and at the same time, the driving pulse number storage section 55a The number of driving pulses stored in is also shifted to the number of driving pulses storage section 55b. After this shift, new numerical data is written into the frame number storage section 54a. Then, each time the pulse motor 23 rotates step by step, the drive pulse number storage section 55a.

55b counts up by "1". Similarly below,
Every time the frame number barcode 3 is read, data is shifted, new data is written, and driving pulse counting is started.

Further, when the negative film 2 is transferred, the image area sensor 8 periodically measures the light of the negative film 2 through the negative mask 7 to generate a time-series signal.

This self-sequence signal is digitally converted and logarithmically converted, then binarized by a comparator 62, and the resulting binary data is written into a frame memory 63.

- This frame memory 63 is written in synchronization with reading from the image area sensor 8, so it stores the latest binary data.

The determination unit 64 reads one line of binary data from the frame memory 63 and detects the leading edge 9a. This edge 9a is the center position PL of the frame memory 63.
Since the deceleration signal has been reached, a deceleration signal is sent to the motor control circuit 65. This motor control circuit 65 increases the period of the drive pulse to rotate the pulse motor 23 at a reduced speed. In addition, the determination unit 6
4 checks the center position when both edges 9a and 9b are detected, and when the center position reaches the position PL, sends a stop signal to the motor control circuit 65, stops the rotation of the pulse motor 23, and stops the top. Correctly position the print position.

After positioning the frame, a test is performed to determine whether the frame should be printed and whether the finish is appropriate.

If it is recognized that the frame is out of focus, by operating the bus key 50, film advance is resumed as described above, and the next frame is positioned. Furthermore, for a frame whose finish is inappropriate, the amount of correction is input by operating the color key 46 and density key 47.

If the print start key 49 is operated after negative verification, the density data for l frames read by the image area sensor 8 immediately after this is taken into the characteristic value extraction section 67.
Various characteristic values are extracted from this. Exposure calculation unit 68
calculates the exposure amount for each color from various characteristic values and LATD values. Color filters 13~
15 into the optical path 18 is adjusted. After this filter adjustment, the shutter 29 is opened and the photographic paper 27 is exposed.

When printing is completed, the determining section 56 determines the numerical data for which the driving pulse is within a certain range, and writes this into the memory 57. In this case, if there are two pieces of numerical data in the 35 mm full size, the one without "A" is selected, and in the 35 mm half size, both are written in the memory 57. At the same time, the controller 41 rotates the pulse motor 23 to transport the photographic paper 27 by one frame.
The unexposed portion is set at the exposure position, and the exposed portion is transported toward the development processing section 36. After this photographic paper is fed, numerical data is read from the memory 57 and sent to the decoder 58. This decoder 58 converts binary numerical data into frame number data with reference to Table 1,
This is sent to the printer 40.

The printing device 40 drives a print head in accordance with input frame number data to print a frame number behind the first photo-printed frame.

After printing the frame number, the controller 41 retracts each color filter 13 to 15 to the standard position via the filter adjustment section 17. The motor control circuit 65 also rotates the pulse motor 23 again to align the next frame with the center of the negative mask as described above.

Edges may become unclear in frames shot with flash, so it is best to combine this with fixed feed. In this case, when the image area sensor 8 cannot detect an edge even if the amount of negative film 2 to be transported reaches about half the frame pitch, priority is given to quantitative feeding.

Then, when the negative film 2 has been advanced by the frame pitch, the film advance is stopped. Incidentally, it is preferable to provide a key for finely adjusting the movement so that it can be corrected when a positional shift occurs in a frame. In this case, a signal indicating the rotational direction of the pulse motor 23 is inputted to the drive pulse number register tα, and the count-up and count-down are performed according to the rotation direction of the pulse motor 23.

In addition to printing frame numbers, the present invention can also be used to automatically set frames in print positions during reprints or reprints. Also,
The present invention can be used not only for photo printing apparatuses but also for negative inspection apparatuses. In this negative verification device, negative verification is performed after frame positioning, and empirically determined exposure correction data and automatically extracted frame number data are stored on a paper tape or magnetic floppy disk. Then, at the time of printing, the storage medium and negative film are set in a photo printing device, and photo printing and frame number printing are performed.

〔Effect of the invention〕

As explained in detail above, the present invention uses a barcode sensor to read the frame number barcode, measures the amount of film transport in synchronization with this reading, and uses a screen detection means to set the frame at the center of the negative mask. Since the frames are positioned so that the film is moved within a certain range after this positioning, the frame numbers for which the amount of film transport is within a certain range are extracted, making it possible to accurately determine the frame number of the frame set in the negative mask. can.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the present invention showing the relationship between a negative mask 1 sensor and a negative film. FIG. 2 is an explanatory diagram showing an example of a frame number barcode. FIG. 3 is a schematic diagram of a photographic printing apparatus embodying the present invention. FIG. 4 is a functional block diagram of the controller. FIG. 5 is a flowchart showing the operation of the photographic printing apparatus. 2... Negative film 2a to 2d... Frame 3... Frame number barcode 5... Frame number 6... Barcode sensor 7... Negative mask 8... Image area sensor 9a, 9b...・Edge 23 ・・Pulse motor 40 ・・Print device 53 ・・Memory 63 ・・・Frame memory for storing numerical data and the number of drive pulses.

Claims (2)

[Claims] (1) A method in which a barcode sensor is placed at a certain distance from the negative mask, and the barcode sensor reads the frame number barcode recorded on the barcode when the photographic film is transported to determine the frame number in the negative mask. , In synchronization with the reading of the frame number barcode, it starts measuring the transport amount of the photographic film, measures the movement position of the frame number barcode or frame number with the position of the barcode sensor as the origin, and also measures the movement position of the frame number barcode or frame number. A detection means detects a frame, and when this frame comes to the center of the negative mask, the photographic film is automatically stopped and the frame is positioned.
A method for determining a frame number of a photographic film, which comprises extracting a frame number whose movement position is within a certain range during this positioning, and determining this as the frame number of a frame within a negative mask. (2) The photographic film according to claim 1, wherein the photographic film is transported by a pulse motor, and the amount of transport of the photographic film is measured by counting the driving pulses of the pulse motor. Frame number determination method.