CN112243092A - Film and film rotating digital film device - Google Patents

Abstract

The utility model relates to a digital cinema technical field discloses a film turns into digital cinema device. The device includes: the film driving mechanism is used for driving the film to walk at a constant speed along a preset track; the sound track reader is arranged on one side of the film and used for reading a sound track area on the film and generating a digital sound signal; an image reader disposed at one side of the film for reading an image area on the film and generating a digital image signal; the method is characterized in that a sound track reader and an image reader are arranged, information on a sound track area and information on an image area on a film are correspondingly collected, a digital sound signal and a digital image signal are synchronously generated and recorded to a processing terminal in real time for storage, and the digital sound signal and the digital image signal are synthesized by the processing terminal to obtain the digital film.

Description

Film and film rotating digital film device

Technical Field

The present disclosure relates to digital cinema technology, and more particularly to a film cinema digital cinema device.

Background

The digital film is characterized in that a new digital technology is applied to the shooting, later stage and release links of the film to replace the traditional optical technology, and the digital medium is used for replacing the original film medium, so that the film market enters the comprehensive digital era.

In the current society where digital movies prevail, the digital movies replacing film movies have become a behavior habit that people can accept culture appreciation more conveniently, more film workers think that the traditional film movies are transcribed into digital movies, the traditional film movies are convenient to store, and more importantly, the precious historical archives and the cultural artistic competitive products can be inherited in a convenient manner. The emphasis on film cinema conversion to digital cinema is: the image information and audio information recorded on the film are correspondingly converted into digital image signals and digital sound signals. How to effectively obtain a digital image signal and a digital sound signal and convert the digital image signal and the digital sound signal into a digital movie is a technical problem to be solved in the prior art.

Disclosure of Invention

An object of the present disclosure is to provide a film-to-digital cinema apparatus for acquiring image information and audio information contained in a film to obtain digital image signals and digital sound signals so as to generate a digital cinema.

In order to achieve the above object, the present disclosure provides a film movie-to-digital movie apparatus, comprising:

the film driving mechanism is used for driving the film to walk at a constant speed along a preset track;

the sound track reader is arranged on one side of the film and used for reading a sound track area on the film and generating a digital sound signal;

and an image reader disposed at one side of the film for reading an image area on the film and generating a digital image signal.

Optionally, the film drive mechanism includes a film take-up spool for receiving film and a film take-up spool for releasing film.

Optionally, a driving shaft is arranged between the film placing shaft and the film collecting shaft, two side edges of the film are provided with toothed holes, and a rack matched with the toothed holes is arranged on the outer peripheral surface of the driving shaft.

Optionally, the film guide device further comprises a plurality of first guide wheels, wherein two first guide wheels are disposed on two sides of the soundtrack reader, and the film between the two first guide wheels is disposed in parallel with the soundtrack reader.

Optionally, the image reading device further comprises a base station, wherein second guide wheels are arranged on two sides of the base station, the two second guide wheels are used for guiding the film to be attached to the surface of the base station to walk, light holes are formed in the base station corresponding to the film, and the image reading device is arranged on one side of the film corresponding to the light holes.

Optionally, the contact surface between the base station and the film is set to be an arc surface, and the light hole is arranged on the arc surface.

Optionally, an auxiliary guide wheel is arranged between each of the two second guide wheels and the base, and the auxiliary guide wheels are arranged on an extension line of a tangent line of a portion between the middle part and the end part of the arc-shaped surface.

Optionally, the film further includes a first light source and a second light source, the first light source is disposed on the other side of the film corresponding to the soundtrack reader, and the second light source is disposed on the other side of the film corresponding to the image reader.

Optionally, the soundtrack reader includes a photosensor and a first analog-to-digital converter;

the photoelectric sensor is used for collecting optical signals of the sound track area and converting the optical signals into analog electric signals; the first analog-to-digital converter is used for converting the analog electric signal into a digital sound signal.

Optionally, the image reader comprises a linear image sensor and a second analog-to-digital converter;

the linear image sensor is used for carrying out line scanning on an image area on the film so as to collect an optical signal of the image area and convert the optical signal into an analog electric signal; the second analog-to-digital converter is used for converting the analog electric signal into a digital image signal.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: the method is characterized in that a sound track reader and an image reader are arranged, information on a sound track area and information on an image area on a film are correspondingly collected, a digital sound signal and a digital image signal are synchronously generated and recorded to a processing terminal in real time for storage, and the digital sound signal and the digital image signal are synthesized by the processing terminal to obtain the digital film.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a front view of an apparatus provided by an embodiment of the present disclosure, with a film shown;

FIG. 2 is a perspective view of an apparatus provided by an embodiment of the disclosure, with film not shown;

fig. 3 is a partially enlarged view of the area a in fig. 2.

Wherein, 1, a film placing shaft; 2. a take-up shaft; 3. a drive shaft; 31. a rack; 4. a first guide wheel; 5. a base station; 51. a limiting step; 52. a transition step; 6. a second guide wheel; 7. a first light source; 8. a second light source; 9. a soundtrack reader; 10. an image reader; 11. an auxiliary guide wheel; 12. a cleaning wheel; 13. a speed measuring wheel; 14. a support plate.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1 and 2, the present disclosure provides a digital cinema apparatus for film cinema, including:

the film driving mechanism is used for driving the film to walk at a constant speed along a preset track, is connected with the film and pulls the film to walk, and the sound track reader 9 and the image reader 10 are arranged on the walking track;

a soundtrack reader 9 disposed at one side of the film for reading a soundtrack area on the film and generating a digital sound signal; one side or two sides of the film can have sound tracks, the sound tracks are continuously arranged along the length direction of the film, the width of the sound tracks changes along with the change of the frequency of the original recorded sound, in the disclosure, a film driving mechanism is adopted to drive the film to pass through a sound track reader 9 at a constant speed, the action speed is consistent with the speed of the film during recording, and thus the sound track reader 9 restores the sound tracks on the film into digital signals, thereby obtaining the audio information contained by the film. For example: the traditional motion picture film is 24 frames, namely the film shoots 24 frames per second, the constant speed driving device drives the film to walk 24 frames per second, so that the audio frequency of the motion picture film can be accurately restored, and the acquisition of digital sound signals is realized;

an image reader 10 disposed at one side of the film for reading an image area on the film and generating a digital image signal; the film comprises a plurality of film images in the length direction, the plurality of film images are image areas, the plurality of film images are arranged continuously or at certain intervals, and in the process that the film walks at a constant speed, the image reader 10 collects the film images and generates digital image signals, so that a plurality of image information contained in the film is obtained.

Compared with the prior art, the sound track reader 9 and the image reader 10 are arranged in the film processing system, correspondingly collect information on a sound track area and an image area on a film, synchronously generate a digital sound signal and a digital image signal, record the digital sound signal and the digital image signal to the processing terminal in real time for storage, and the processing terminal synthesizes the digital sound signal and the digital image signal to obtain the digital film.

In some embodiments, as shown in fig. 1 and 2, the film driving mechanism includes a film releasing shaft 1 for releasing the film and a film collecting shaft 2 for receiving the film, the film collecting shaft 2 being connected to a driving motor; in an initial state, the whole roll of film is wound on a first film shaft, the first film shaft is connected with a film releasing shaft 1, the end part of the film is connected with a second film shaft, the second film shaft is connected with a film collecting shaft 2, and a driving motor drives the film collecting shaft 2 to rotate, so that the film can be driven to walk along a preset track.

Among the above-mentioned technical scheme, along with the rotation of receiving spool 2, the epaxial film of second film is more and more thick, if receive spool 2 and keep certain rotational speed, then the walking speed of film is more and more fast, can set up the encoder on receiving spool 2 this moment, according to the thickness information of film, the monitoring is received the turn-round of spool 2 and is calculated the linear velocity of receiving 2 outer lane films of spool with this, the encoder is connected with driving motor's controller, the rotational speed of spool 2 is received in controller control, make the linear velocity of receiving 2 outer lane films of spool keep unanimous all the time, finally realize the film walking at the uniform velocity.

In some embodiments, as shown in fig. 1 and 2, a driving shaft 3 is disposed between the film releasing shaft 1 and the film receiving shaft 2, conventionally, two sides of the film are provided with a plurality of perforations uniformly arranged along the length direction of the film, and the driving shaft 3 is provided with a rack 31 on its outer circumferential surface for cooperating with the perforations.

Among the above-mentioned technical scheme, set up drive shaft 3 between putting spool 1 and receiving spool 2, drive shaft 3 is connected with the motor, drive shaft 3 passes through the cooperation of rack 31 and perforation, will put the film on the spool 1 and pull at the uniform velocity walking for the film is at the uniform velocity through soundtrack reader 9 and image reader 10, be convenient for both carry out information acquisition, the film through drive shaft 3 is rolled up by receiving spool 2 again, do not require in this scheme that receiving spool 2 variable speed is rotatory, drive shaft 3 uniform rotation can drive the film at the uniform velocity walking.

In some embodiments, as shown in fig. 1 and 2, a first damper is disposed on the film releasing shaft 1, the film releasing shaft 1 is rotatably connected to the support plate 14 through the first damper, a second damper is disposed on the film collecting shaft 2, the film collecting shaft 2 is rotatably connected to the support plate 14, and the driving motor is connected to the film collecting shaft 2 through the second damper.

Among the above-mentioned technical scheme, drive shaft 3 draws the film at the uniform velocity walking, drive shaft 3 passes through the film and drives and puts a 1 motion of spool, the effect of first attenuator has increased and has put the rotational resistance of spool 1, so make drive shaft 3 and put the film between the spool 1 and be in the tensioning state, when tensioning to a certain extent, it rotates to put spool 1, the film is in the tensioning and levels the state and is convenient for sound track reader 9 and image reader 10 to gather information, of course the resistance of first attenuator should not be too big, otherwise lead to the film to be pulled out of shape easily, this resistance value changes along with the type of film is different, the biggest pulling force that different films can bear belongs to the common knowledge that technical staff in the field publicly known, no longer describe here.

Receive a spool 2 and pass through the at uniform velocity of rotation of second attenuator drive by driving motor, receive the epaxial second film axle of spool 2 and carry out the rolling film, the film number of piles of second film axle outer lane is more and more, the linear velocity of outer lane film can be greater than the rotational speed of drive shaft 3 gradually, the situation that tightens up can appear in the film between drive shaft 3 and the receipts spool 2 this moment, there is a film tension force between the two, when the film tension force acts on the second attenuator, it can skid the stall to receive spool 2, but driving motor still continues to rotate, when the film tension force reduces, it resumes to rotate to receive spool 2, the second film axle continues the rolling film.

In some embodiments, as shown in fig. 1 and 2, the driving shaft 3 is disposed between the film releasing shaft 1 and the film receiving shaft 2, the sound track reader 9 is disposed between the film releasing shaft 1 and the driving shaft 3, the driving shaft 3 and the plurality of guide wheels 4 are rotatably connected to the support plate 14, wherein two first guide wheels 4 are disposed on both sides of the sound track reader 9, so that the film between the first guide wheels 4 is disposed in parallel with the sound track reader 9.

In the above technical solution, when the soundtrack reader 3 collects the optical signal of the soundtrack area on the film, it is to be ensured that the film is arranged in parallel with the soundtrack reader 3, the first guide wheels 4 play a role of direction-changing guide, and a plurality of first guide wheels 4 can be arranged, but it is to be ensured that two first guide wheels 4 are correspondingly arranged on two side edges of the soundtrack reader 3, and the film is parallel to the soundtrack reader 3 when passing through the two first guide wheels 4, thereby improving the accuracy of the optical signal collected by the soundtrack reader 3.

In some embodiments, as shown in fig. 1 to 3, the apparatus further includes a base station 5, wherein second guide wheels 6 are disposed on both sides of the base station 5, the second guide wheels 6 are rotatably connected to the frame plate 14, light holes are disposed on the base station 5 corresponding to the film, the base station 5 provides a running surface for the film, the base station 5 is fixed on the frame plate 14, the second guide wheels 6 are disposed at a position lower than the upper surface of the base station 5, the second guide wheels 6 press the film to make the film adhere to the upper surface of the base station 5, so as to limit the film from shaking up and down, the light holes are used for providing a light source, the image reader 10 is disposed at one side of the film corresponding to the light holes, the image reader 10 collects optical signals of an image area on the film by using a linear scanning reader, and the linear scanning reader is disposed along the width direction of the film and performs linear scanning along.

In the technical scheme, in the scanning and reading process, the film is ensured to be always in a stable and uniform-speed walking state and cannot shake up and down, so that the precision of acquiring optical signals by the linear scanning reader is improved, and the working state is realized through the second guide wheel 6 and the base station 5; as one preferred embodiment, a sound track reader 9 and an image reader 10 are sequentially disposed between the film laying shaft 1 and the driving shaft 3, first guide wheels 4 are disposed on both sides of the sound track reader 9, and second guide wheels 6 are disposed on both sides of the image reader 10, wherein the second guide wheels 6 on one side can be shared with the first guide wheels 4.

In some embodiments, as shown in fig. 1 to 3, the contact surface between the base 5 and the film is an arc surface, so that the film can be more securely attached to the base 5, the film can stably run without shaking, and the sharp edges and corners at the ends of the film and the arc surface can be avoided, thereby avoiding damage to the film.

In the technical scheme, the film is attached to the arc-shaped surface of the base station 5 by the guidance of the second guide wheel 6, and the light source is provided in the light-transmitting hole to irradiate the film, so that the image reader 10 can accurately scan and read the optical signal of the film, and can more accurately obtain a digital image signal; preferably, the base station 5 is provided with limiting steps 51 at the two side edges of the film, and the limiting steps 51 at the two sides are used for restricting the film from shifting in the width direction, so as to further ensure the stable running of the film; and still be provided with transition step 52 between arcwall face and light trap, transition step 52 extends towards the light trap along the arcwall face, and transition step 52 provides the transition plane to the film can be smooth passes through the light trap, so does benefit to image reader 10 and scans the image area of gathering.

Furthermore, auxiliary guide wheels 11 are arranged between the two second guide wheels 6 and the base station 5, the auxiliary guide wheels 11 are rotatably connected to the support plate 14, the second guide wheels 6 mainly play a role in guiding and pressing down so that the film is attached to the arc-shaped surface, the auxiliary guide wheels 11 are arranged between the second guide wheels 6 and the base station 5 to play a role in transition, and accordingly, the included angle of the film relative to the arc-shaped surface can be reduced, so that the damage to the film caused by edges and corners on two sides of the arc-shaped surface is further avoided; preferably, the auxiliary guide wheel 11 is arranged on an extension line of a tangent line of a part between the middle part and the end part of the arc-shaped surface, namely, a film between the auxiliary guide wheel 11 and the base station 5 is tangent to a part between the middle part and the end part of the arc-shaped surface, so that the auxiliary guide wheel 11 can jack the film by a certain height, the film is attached to the middle part of the arc-shaped surface, but the film is not contacted with the end part of the arc-shaped surface, the film is not contacted with edges and corners of the end part of the arc-shaped surface completely, and the film can be completely prevented from being damaged by the edges and corners on two sides of the arc; the auxiliary guide wheel 11 is arranged on the inner side of the tangent line of the end part of the arc-shaped surface, so that the film can be attached to the arc-shaped surface; it should be emphasized that the auxiliary guide wheel 11 between the base station 5 and the film collecting shaft 2 can be replaced by a driving shaft 3, the driving shaft 3 not only provides driving force to drive the film to walk at a constant speed, but also can realize the guiding function to enable the film to be attached to the arc-shaped surface, so as to avoid the film from shaking; the auxiliary guide wheel 11 between the film-placing shaft 1 and the base 5 can also be provided with a rack on the outer peripheral surface thereof, which is matched with the tooth hole on the film.

Further, a cleaning wheel 12 is arranged on the support plate 14, the cleaning wheel 12 is arranged beside the film, and the cleaning wheel 12 can clean the running film and wipe off dirt on the film; the bracket plate 14 is also provided with two speed measuring wheels 13, the film runs through the speed measuring wheels 13, one of the two speed measuring wheels 13 is positioned between the film placing shaft 1 and the driving shaft 3 and is used for measuring the speed of the section of film, and the other one of the two speed measuring wheels 13 is positioned between the driving shaft 3 and the film placing shaft 1 and is used for measuring the speed of the section of film, so that the working state of the device can be monitored conveniently.

In some embodiments, as shown in fig. 1 to 3, a first light source 7 and a second light source 8 are further included, the first light source 7 and the second light source 8 are both fixed on the support plate 14, the first light source 7 is disposed on the other side of the film corresponding to the soundtrack reader 9, and the second light source 8 is disposed on the other side of the film corresponding to the image reader 10.

In the technical scheme, a focalizer can be arranged between the first light source 7 and the film, light emitted by the first light source 7 forms an optical edge through the focalizer, the optical edge is perpendicular to the length direction of the film and emits to the sound track, the optical edge penetrates through the sound track to form light with continuously changing intensity and emits to the sound track reader 9 along with the continuous and stable walking of the film driven by the film driving mechanism, the sound track reader 9 collects the light signals and converts the light signals into digital signals, and the digital sound signals are obtained.

The second light source 8 can be arranged in the light transmission hole in the scheme, similarly, a focalizer can also be arranged between the second light source 8 and the film, the optical edge is perpendicular to the length direction of the film and emits to the image area, and the linear scanning acquisition area of the image reader 10 corresponds to the optical edge, so that the optical signal of the image area is accurately acquired and converted into a digital signal, and the digital image signal is acquired.

In some embodiments, the soundtrack reader 9 comprises a photosensor, a first filter amplifier and a first analog-to-digital converter.

The photoelectric sensor is used for collecting the optical signal of the sound track area and converting the optical signal into an analog electric signal; the first filter amplifier is used for filtering and amplifying the analog electric signal; the first analog-to-digital converter is used for converting the filtered and amplified analog electric signal into a digital sound signal; it is emphasized that it is well within the ability of the person skilled in the art to implement the set-up of the soundtrack reader 9 in accordance with the above, in order to achieve acquisition of the soundtrack area on the film, and will not be described further herein.

In some embodiments, image reader 10 includes a linear image sensor, a second filter amplifier, and a second analog-to-digital converter; the linear image sensor is used for carrying out line scanning on an image area on the film so as to collect an optical signal of the image area and convert the optical signal into an analog electric signal; the first filter amplifier is used for filtering and amplifying the analog electric signal; the second analog-to-digital converter is used for converting the filtered and amplified analog electric signal into a digital image signal.

In the above technical solution, a lens may be further disposed between the linear image sensor and the film, wherein the lens may be a CCD lens or a CMOS lens commonly used in the prior art, and the linear image sensor correspondingly employs a linear CCD image sensor or a linear CMOS image sensor; it is emphasized that it is well within the ability of one skilled in the art to implement the arrangement of image reader 10 in accordance with the above to capture image areas on film, and will not be described in detail herein.

The digital audio signal and the digital image signal are received in real time and stored, audio information is correspondingly obtained after the digital audio signal generated by the sound track reader 9 is received, image information is correspondingly obtained after the digital image signal generated by the image reader 10 is received, the image information needs to be split by the processing terminal to obtain a plurality of images, and the processing principle is as follows: the image area on the film comprises a plurality of film images which are continuously or at certain intervals, the size of each film image is consistent, and the digital image signal is finally split into a plurality of images by the processing terminal according to the principle.

For example: the traditional movie film is 24 frames, namely, the film shoots 24 frames per second, a processing terminal obtains n images according to digital image signals generated by an image reader 10, each 24 images form a video of one second, finally, the video of n/24 seconds can be formed, and the processing terminal obtains n/24 seconds of audio according to digital sound signals generated by a sound track reader 9; the processing terminal comprises a video editing program to realize the synthesis of the video and the audio, thereby obtaining the digital movie. The video editor may employ Adobe Premiere, and the version may employ CS4, CS5, CS6, CC 2014, CC 2015, CC 2017, CC 2018, CC2019, and CC2020 versions.

If the number of playing frames of the video is to be increased, the video editing program can also be used for realizing frame supplement, for example, a digital movie with 60 frames is to be obtained, 24 pictures contained in each second of the video are copied, so that 60 pictures are obtained in each second of the video, and the generation of the digital movie with 60 frames is realized through frame supplement.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A film motion picture to digital motion picture apparatus comprising:

the film driving mechanism is used for driving the film to walk at a constant speed along a preset track;

a soundtrack reader (9) disposed at one side of the film for reading a soundtrack area on the film and generating a digital sound signal;

and an image reader (10) disposed at one side of the film for reading an image area on the film and generating a digital image signal.

2. The film cine-rotation digital cinema device according to claim 1, characterized in that the film driving mechanism comprises a film reel (1) for releasing the film and a film reel (2) for receiving the film.

3. A film motion picture to digital cinema device according to claim 2, characterized in that a driving shaft (3) is arranged between the film-releasing shaft (1) and the film-receiving shaft (2), two side edges of the film are provided with perforations, and the outer peripheral surface of the driving shaft (3) is provided with a rack (31) matched with the perforations.

4. The film cine-digital cinema arrangement according to claim 1, further comprising a first guide wheel (4), wherein the first guide wheel (4) is provided in at least two, wherein two of the first guide wheels (4) are provided on both sides of the soundtrack reader (9), and wherein the film between the two first guide wheels (4) is arranged in parallel with the soundtrack reader (9).

5. The film/film digital cinema device according to claim 1, further comprising a base (5), wherein second guide wheels (6) are disposed on both sides of the base (5), the two second guide wheels (6) are used for guiding a film to be attached to the surface of the base (5) to run, a light hole is formed in the base (5) corresponding to the film, and the image reader (10) is disposed on one side of the film corresponding to the light hole.

6. The film motion picture to digital motion picture apparatus as claimed in claim 5, wherein the contact surface between the base (5) and the film is provided as an arc surface, and the light transmission hole is opened on the arc surface.

7. A film cinema rotating digital cinema device according to claim 6, characterized in that an auxiliary guide wheel (11) is arranged between both of the second guide wheels (6) and the base station (5), the auxiliary guide wheel (11) is arranged on the extension of the tangent of the part between the middle part and the end part of the arc-shaped face.

8. The film digital cinema device according to claim 1, characterized by further comprising a first light source (7) and a second light source (8), the first light source (7) being disposed on the other side of the film corresponding to the soundtrack reader (9), the second light source (8) being disposed on the other side of the film corresponding to the image reader (10).

9. The film cinema digital cinema device according to claim 1, characterized in that the soundtrack reader (9) comprises a photosensor and a first analog-to-digital converter;

the photoelectric sensor is used for collecting optical signals of the sound track area and converting the optical signals into analog electric signals; the first analog-to-digital converter is used for converting the analog electric signal into a digital sound signal.

10. The film cinema digital cinema device according to claim 1, characterized in that the image reader (10) comprises a linear image sensor and a second analog-to-digital converter;

the linear image sensor is used for carrying out line scanning on an image area on the film so as to collect an optical signal of the image area and convert the optical signal into an analog electric signal; the second analog-to-digital converter is used for converting the analog electric signal into a digital image signal.

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