JPS6177041A - Image information detector - Google Patents

Abstract

PURPOSE:To obtain image information easily and accurately by providing a two-dimensional sensor, which detects the transmitted light (reflected light) of a film illuminated with a light source, on the outside of a luminous flux and making the surface of the sensor and that of the film parallel with each other. CONSTITUTION:A negative film 2 on a negative carrier 1 is irradiated with a light source 4, and the transmitted light is focused on a photographic paper 7 by a lens 5. A black shutter 6 is opened and closed synchronously with movement of the film 2. In case of a color print, three-primary color filters 3 are used alternately to focus images of three primary colors successively. A two-dimensional image sensor 10 consisting of many photodetectors is provided on the outside of the luminous flux for print so that its plane is parallel with the plane of the film 2, and the image of each picture element is focused on the sensor 10 by a lens 11. The output of the sensor 10 is operated by a processing circuit 12 to obtain picture information, and an exposure to the photographic paper 7 is determined by a control circuit omitted in the figure to print images. Thus, the distortionless image is focused on the two-dimensional image sensor to perform correct exposure on a basis of accurate image information.

Description

Detailed Description of the Invention The present invention detects image information of an original film such as a negative film from the information of the entire screen divided into pixels, and automatically determines the exposure layer or correction-1 for printing. The present invention relates to an image information detection device for photo printing.

(Technical background of the invention and its problems) In a photographic printing apparatus, the density of 111-picture film (for example, negative film) must be measured in order to determine the printing exposure amount or correction amount. FIG. 1 shows an example of a photoprinting device configured for this purpose.
By adding a two-dimensional image sensor IO to a conventional photo printing device, image information on the negative films L and 2 can be detected accurately and in detail with a simple configuration. That is, the negative film 2 sent to the position of the negative carrier l is yellow (Y),
Magenta (M) and cyan (C) three primary color filters 3
The transmitted light from the negative film 2 passes through the lens system 5 and the black shutter 6 and reaches the photographic paper 7. The photographic paper 7 is sent to the feed roller 7A. The negative film 2 is wound around the roller 7B in synchronization with the conveyance and stopping of the negative film 2. Then, the two-dimensional image sensor 1 is tilted to the optical axis LS of the light ff4 and the negative film 2.
G is provided near the negative film 2, and a lens system 11 is provided in front of the two-dimensional image sensor 10 to image approximately the center of the negative film 2, and a unitized detection system is provided. There is an I on the back of the device that performs image processing.
A board 12 is attached to which a processing circuit made of C or the like is mounted.

Here, the two-dimensional image sensor 10 includes an imaging section 101 that optically captures an image, and an imaging section 10 as shown in FIG.
ga section 10 for accumulating the charge transferred from 1
2 and an output register section 103 for outputting the charges accumulated in the accumulation section 102, and outputs two-dimensional (area) image information by controlling the drive signal +015-IQ3S from the drive circuit. After photoelectric conversion, an analog image signal PS is serially output from the output register section 103.

It's supposed to be powerful. The circuit configuration mounted on the board 12 is, for example, as shown in FIG. The light irradiated onto the imaging section 101 is output as an image signal PS from the output register section 103, sampled and held in the sample hold circuit 21 at a predetermined sampling period, and the sample value is converted into a digital signal DS by the An converter 22. Converted.ADn
The digital signal O5 from the converter 22 is sent to the logarithmic conversion circuit 23.
The signal is inputted to , logarithmically converted, converted into a concentration signal ON, and then written into the memory 25 via the write control circuit 24 .

Note that the write control circuit 24 receives a reading speed signal RS from the drive circuit 20 for driving the image sensor 1O to read image information at a constant speed, and
According to the driving speed of 0, the density signals DN are written in order at predetermined positions of 11% and 25.

In such a configuration, image information necessary for photo printing (e.g. size, average density across the entire screen, contrast,
The two-dimensional image sensor 10 divides the entire screen of the negative film 2 into a large number of aligned pixels and detects the maximum density and minimum moisture content. That is, by applying predetermined drive signals 1G1st to 103S from the drive circuit 20 to the image sensor 10, the two-dimensional image sensor IO converts the transmitted light of the negative film 2 placed in the printing section into the lens system! Since the two-dimensional image sensor IO divides the entire negative film 2 into a large number of aligned small pixels 21 as shown in FIG. The entire screen of the film 2 can be scanned. After scanning the entire screen, the image sensor 1
The image signal PS is sequentially output from the output register section 103 of 0, the image signal PS is sampled and held in the sample hold circuit 21, and the sample value is sent to the AOn converter 22.
Convert to digital signal O5. The digital signal O5 from the An converter 22 is logarithmically converted by the logarithmic conversion circuit 23 and obtained as a concentration signal ON, and this concentration signal ON is stored in the memory 25 under the control of the write control circuit 24 as shown in FIG.
The density digital values of the negative film 2 are stored in an array corresponding to the pixels 21 as shown in B).

In this way, when the digital value for each pixel of the negative film 2 or the density value for each pixel regarding the three primary colors is stored in the memory 25, the digital value can be read out from the memory 25 for each pixel of the negative film 2 and used. I can do it. Therefore, if density values such as those shown in Figure 144 (B) are determined and stored for each of the three primary colors RGB, then by reading out the stored values and performing calculations, etc., it is possible to obtain the same photographic printing exposure as in the past. It can be used as a determination or correction amount.

Here, determination of the size of image frames of the negative film 2 will be explained. The long negative film 2 is sequentially conveyed to the negative carrier L of the printing section, where, as shown in FIG. The upper guide IB engages with the guide IC.
The negative film 2 held between the lower guide IC and the lower guide IC is printed frame by frame.

The size of the opening IA of the upper guide IB completely corresponds to the frame size of the negative film 2, and the snaking part at the periphery of the frame image protrudes from the edge of the opening IA of the upper guide IB. Never.

Therefore, the area where the two-dimensional image sensor 1O receives light includes not only the frame images of the negative film 2, but also the non-transmitted light portion of the upper guide 1B so that it can handle large-sized negative films with ease. 2
The image information of the area detected by the dimensional image sensor IO is
For example, the image information for a 110 size negative carrier is as shown in Figure 6 (A), and the image information for a 135 size negative carrier is as shown in Figure 6 (B). ) and (B) show an example of detected image information of a snook image when no image is taken on the negative film 2, and the part surrounded by the broken line in the center is the opening IA, that is, the image frame. Since the size of the 0 image frame indicating the area corresponds to the size of the negative film 2, the density "O" indicating a snook is detected from the image information read by the image sensor 10 and its By determining the area, the area of the opening IA can be determined, and as a result, the size of the negative film 2 can be determined. In this case, since the optical axis of the image sensor 10 is directed to approximately the center of the aperture IA, the density is "0".
” (or a value in the vicinity) of the negative film 2 by counting the I+' number using hardware or software, and comparing the counted value with a predetermined value predetermined for each size. size can be determined.

In this way, from the entire image information read by the image sensor IO, the area of density "O" indicating the size of the opening IA of the negative carrier 1 is counted by the number of pixels, and the size of the negative film 2 is calculated from the counted value. For example, a
If the number of pixels with a degree of "0" is 12 as shown in Figure 6 (A) (for example, it may be between 10 and 14 to take a margin), the size is 110, as shown in Figure 6 (B). In the case of 56 (similarly, for example, between 54 and 58), the size is determined to be 135, and in the case of 36 to 40, the size is determined to be 12e.

Further, the exposure amount is also determined from the negative film 2 stored in the memory 25.
It can be determined using digital values for each pixel or density values for each pixel regarding the three primary colors.

By the way, in an image information detecting device such as "Double",
Since the dimensional image sensor IO is provided at an angle with respect to the optical axis LS of the negative film 2 and the light source 4, the negative film 2 that is imaged on the two-dimensional image sensor 10 is
The disadvantage is that the image is distorted and correct image information cannot be detected. In other words, if it was originally shown in Figure 6 (B
), which are arranged in a rectangular shape on the image sensor 10.
Although 0° information should be obtained, the formed image is distorted, resulting in differences depending on distance, as shown by the broken line in Figure 7. If such image distortion occurs, the actual Since a deviation occurs between the image and the information detected on the image sensor 10, accurate image information cannot be detected. In addition, in order to eliminate such drawbacks, the transmitted light of the negative film 2 is reflected by a half mirror placed in front of the lens system 5, and this reflected light is used as a two-dimensional image sensor! It is also conceivable to provide the optical axis with the optical axis perpendicular to 0. However, this method has the disadvantage that an extra optical system called a half mirror is inserted in front of the lens system 5, which adversely affects the quality of the image printed on the photographic paper 2. Another way to solve this drawback is to use an image processing method that corrects the distortion when data is loaded into the memory 25 or by calculating the number of pixels of the captured image information using hardware or software. Although this is possible, it is not a good idea because accurate correction is difficult with a limited number of pixels, and the arithmetic processing is complex and takes a lot of time.

(Object of the invention) This invention was made based on the above-mentioned idea, and the object of the invention is to provide a two-dimensional image sensor 111-10.
It is an object of the present invention to provide a device that can detect accurate image information by correcting distortion of a detected image caused by providing the sensor at an angle with respect to the optical axis.

(Summary of the Invention) This invention receives transmitted light or reflected light from an original film illuminated by a light source with a two-dimensional image sensor, and
This relates to an image information detection device that detects image information in the entire range of light received by a dimensional image sensor for each pixel, and when the two-dimensional image sensor is installed at a position away from the optical axis of the original film, the original film is Distortion of the detected image due to oblique photometry is corrected by arranging the light receiving surface of the two-dimensional image sensor parallel to the original film.

(Embodiment of the Invention) FIG. 8 shows an example in which the image detection device of the present invention is attached to a photoprinting device, corresponding to FIG. in parallel,
Moreover, it is provided so as not to block the optical path from the negative film 2 to the lens system 5. When the two-dimensional image sensor 10 is provided in this way, the optical axis So connecting the two-dimensional image sensor lO and the negative film 2 is inclined with respect to the optical axis LS, and the optical axis in front of the two-dimensional image sensor 10 is 1. The lens system 11 for forming an image of approximately the center of the negative film 2 on S' is arranged so that the original optical axis of the lens is perpendicular to the light-receiving surface of the two-dimensional image sensor lO, as shown in FIG. 9(A). It is located in Further, a substrate 12 equipped with a processing circuit such as an IC for processing one image is attached to the surface of the unitized detection device δ.

In this way, even if the two-dimensional image sensor lO and lens system 11 are installed with the optical axis tilted in a general photoprinting device,
Since the light receiving surface of the two-dimensional image sensor 10 is parallel to the negative film 2, an accurate image without distortion of the negative film 2 is formed on the two-dimensional image sensor 10. Therefore, for example, a negative image is no longer detected as shown in FIG. 7, but is always detected accurately as shown in FIG. 6(B). In other words, this invention is based on seven ori (CameraAdjustment) in photographic technology.
s), and in order to simplify the mechanism of the printing device, the optical axis of the lens for the two-dimensional image sensor lO is intentionally made not to intersect at right angles at the center of the screen, and image information is accurately detected. I'm trying to make it possible. The 7 types of orientation include shift (moving the lens seat or screen frame in parallel up, down, left, or right), tilt (tilting the lens seat or screen frame in the opposite direction or downward), swing,
There is a rise fall.

In the above embodiment, the optical axis LX of the lens system 11 is arranged perpendicular to the light-receiving surface of the two-dimensional image sensor lO, but as shown in FIG. 9(B), the optical axis LX of the lens system 11 is The optical axis LX and the optical axis LS' may be arranged so as to coincide with each other. As in the embodiment shown in FIG. 9A, if the optical axis LX of the lens system 11 is arranged perpendicular to the light receiving surface of the two-dimensional image sensor 10, the entire surface of the two-dimensional image sensor 10 can be accurately Although it is possible to focus, since the lens 11 is used in a fanned manner, a lens with a wide image circle is required. On the other hand, if the optical axis X of the lens system 11 is arranged so that the optical axis LS' coincides with that shown in FIG. 9(B), in order to focus the entire surface of the two-dimensional image sensor LO, Although it is necessary to increase the depth of focus, it is possible to use a lens with a narrow image circle.

() Effect of A light) As described above, according to the image information detection device of the present invention, 2
Since the light-receiving surface of the dimensional image sensor is arranged parallel to the original film, an accurate image without distortion is formed on the two-dimensional image sensor, and more accurate image information can be detected.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional image information detection device applied to a photo printing device, Fig. 2 is a block diagram showing the functions of a two-dimensional image sensor, and Fig. 3 is a block diagram showing the control system of the two-dimensional image sensor. Figures 4(A) and 4(B) are diagrams explaining an example of the correspondence between pixel division of the original film and stored data, Figure 5 is a diagram showing details of the printing section, and Figure 6(A) and CB) are memory diagrams showing examples of image information, respectively.
The figure is a diagram for explaining the state of distortion of the detected image, FIG. 8 is a configuration diagram of the image information detection device of the present invention, and FIG. 9 (A)
and (B) are enlarged views of a two-dimensional image sensor section of an image information detection device to which the present invention is applied. l...Negative carrier, 2...Negative film, 3...
- Filter, 4... Light source, 5. ■・・・Lens system, 6
...Bra, Kushanta, 7...Photographic paper, 10.
... Two-dimensional image sensor, 20 ... Drive circuit, 22
...AD converter, 24...Write control circuit, 25.
··memory. -1!71st 5th Figure Condolence 6 Figure (A) () 3rd Figure 7 Figure 6 Figure Y=Yo:=). C+1 furnace/9th sub

Claims (1)

[Claims] In an image information detection device that receives transmitted light or reflected light from an original film illuminated by a light source with a two-dimensional image sensor, and detects image information of the entire area received by the two-dimensional image sensor for each pixel, the original film When the two-dimensional image sensor is installed at a position away from the optical axis of the film, distortion of the detected image due to diagonal photometry of the original film can be avoided by aligning the light-receiving surface of the two-dimensional image sensor parallel to the original film. An image information detection device characterized in that the image information detection device is configured to be corrected by arranging the image information.