EP0830781A1 - Viseur video - Google Patents

Viseur video

Info

Publication number
EP0830781A1
EP0830781A1 EP96912425A EP96912425A EP0830781A1 EP 0830781 A1 EP0830781 A1 EP 0830781A1 EP 96912425 A EP96912425 A EP 96912425A EP 96912425 A EP96912425 A EP 96912425A EP 0830781 A1 EP0830781 A1 EP 0830781A1
Authority
EP
European Patent Office
Prior art keywords
scene
video
video camera
user
viewing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96912425A
Other languages
German (de)
English (en)
Other versions
EP0830781A4 (fr
Inventor
Michael H. Cameron
James F. Cameron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LIGHTSTORM TECHNOLOGIES Inc
Original Assignee
LIGHTSTORM TECHNOLOGIES Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LIGHTSTORM TECHNOLOGIES Inc filed Critical LIGHTSTORM TECHNOLOGIES Inc
Publication of EP0830781A1 publication Critical patent/EP0830781A1/fr
Publication of EP0830781A4 publication Critical patent/EP0830781A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/53—Constructional details of electronic viewfinders, e.g. rotatable or detachable
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/63—Control of cameras or camera modules by using electronic viewfinders

Definitions

  • the present invention relates to the field of motion picture production systems, and more particularly, to motion picture production systems which permit a director to preview a scene for the placement of actors, action shots and/or special effects prior to actual filming.
  • the director To achieve the proper "feel” of a scene or action shot, including the placement of actors, lights and in many instances the motion of the motion picture camera, it is desirable for the director to accurately preview the scene prior to actual filming. Optimally, the director wishes to preview or "walk” the scene using the same lens which will be used on the motion picture camera. It is important to preview the scene using the same lens that will be used in the actual filming, since various lenses have characteristics which differ from lens to lens.
  • the present invention provides a hand held apparatus which permits the simultaneous viewing of a scene and the remote recording of the scene using a video camera.
  • the simultaneous viewing of the director's scene preview by a crew member with a monitor is extremely helpful in expediting an otherwise slow and costly process.
  • actors and crew members may quickly adapt to new scenes or changes as a group, with the same clear visual reference.
  • the present invention has particular application for use in motion picture productions incorporating action scenes requiring camera movement, and provides the director with an effi ⁇ cient method for experimenting with various camera move ⁇ ments and recording a contemplated scene for later review. Summary of the Invention
  • An optical assembly includes an optical housing body having a lens mounting bracket for receiving a primary camera lens .
  • the primary camera lens is selected to correspond to the same motion picture or video lens which will be used during the actual filming of the particular scene.
  • a removable ground glass relay lens having visible etched format lines corresponding to the aspect ratio chosen for a particular production is re ⁇ ceived within a barrel-shaped receiving section of the optical housing body. The ground glass relay lens may be inserted and removed from the barrel-shaped receiving section.
  • a sighting tube is coupled to the optical housing permitting a user to view a scene by viewing the scene through the sighting tube, the ground glass relay lens and the primary camera lens.
  • a video camera is coupled to the optical housing body through an intermedi- ate lens and is provided with a view of the scene by a beam splitter and turning mirror disposed between the sighting tube and the ground glass relay lens.
  • the video camera provides a video signal corresponding to the scene as viewed by the user through the relay lens and the selected primary camera lens.
  • a base is coupled to the optical assembly by a post having a gripping portion comprised of a rubberized material.
  • the base provides a counter mass balance for the optical assembly to stabilize the viewfinder when gripped by a user.
  • the base accepts and houses electronic components, including a removable transmitter assembly having an antenna to transmit the video signal generated by the video camera to one or more remote receivers that may be in turn coupled to video recorders .
  • the video recorders and receivers may be stationary, or may take the form of hand held video recorders carried by cast and/or crew members on a set.
  • the electronics disposed within the base includes a frame line generator for generating frame lines corresponding to selected aspect ratios used in motion picture and other productions. The frame line generator inserts selected frame lines in the output video signal prior to transmission to the remote receiver.
  • a selector switch is provided in the base to permit the user to select preset aspect ratio formats generated by the frame line generator.
  • the electronics further includes a character and a graphic generation circuit for inserting alpha-numeric characters and graphics in the output video signal.
  • the video camera and supporting electronics disposed in the base are powered by a removable Nicad battery pack which is received in the underside of the base.
  • a charge coupled device In an alternative embodiment, a charge coupled device
  • a rotatable pellicle is capable of directing light in opposite directions, depending upon the position of the pellicle. In this manner, an image may be directed toward a camera disposed beneath the optical assembly or above the optical assembly, allowing a director to choose which configuration is superior for a particular scene.
  • a director wishing to preview a scene selects a primary camera lens which is to be used during actual filming.
  • An appropriate ground glass relay lens having the desired aspect ratio etched therein is inserted into the receiving barrel.
  • the director then switches on the supporting electronics and video camera, and selects one or more aspect ratio formats to be inserted into the output video signal.
  • the director may choose to optically view the scene through the sighting tube, or alternative ⁇ ly, to view the scene holding a hand held monitor or an external attached monitor, such as a small monochrome or color CCD or LCD screen.
  • the scene may then be previewed and viewed by the director as well as others, including camera operators, special effects consultants, lighting specialists and actors using remote receivers.
  • the director may do so and then re-walk the scene until satisfied that all of the necessary elements for a suc ⁇ cessful shot are present.
  • Figure 1 is a perspective view of a preferred embodi- ment of the video viewfinder of the present invention including a removable ground glass relay optic element and a removable motion picture camera lens.
  • Figure 2 is a partial cross-section of the preferred embodiment of the video viewfinder of the present inven- tion illustrating the optical path whereby a user and a video camera simultaneously view a scene through the motion picture camera lens.
  • Figure 3 is a block diagram illustrating the electri ⁇ cal and optical systems of the preferred embodiment of the video viewfinder of the present invention.
  • Figure 4 illustrates a view through the optical path of the preferred embodiment of the video viewfinder of the present invention, including format lines for a selected aspect ratio chosen for a motion picture production.
  • Figure 5 illustrates the view of a scene as recorded by the preferred embodiment of the video viewfinder of the present invention's video camera, wherein the video image includes format lines for a selected aspect ratio as generated by a frame line generator.
  • Figure 6 illustrates the preferred embodiment of the video viewfinder of the present invention's use of a character generation circuit and a graphic generator to electronically insert additional data into the video output of the present invention.
  • Figure 7 illustrates the preferred embodiment of the video viewfinder of the present invention's use of multi- pie format lines generated by the frame line generator of the present invention, and the use of selected shading to identify "out of scene" objects within the field as recorded by the video camera.
  • Figure 8 is a cross-section illustrating the optical path of the preferred embodiment of the present invention.
  • Figure 9 illustrates the preferred embodiment of the present invention's low mode wherein a user may invert the preferred embodiment of the present invention using a handle attached to the bottom of the base.
  • Figure 10 illustrates a dovetail coupling mechanism when the preferred embodiment of the present invention is utilized in a low mode viewing arrangement.
  • FIG 11 illustrates an alternate embodiment of the present invention.
  • Figure 12 illustrates a cross section of the embodi ⁇ ment of Figure 11.
  • Figure 13 illustrates an exploded assembly drawing for the pellicle illustrated in Figure 12.
  • Figure 14 is a side view of the embodiment of Figure 11, illustrating a de-anamorphic lens assembly.
  • Figure 15 illustrates a coupling mechanism for the optical body and post assembly illustrated in Figure 11.
  • Figure 16 is another alternate embodiment of the present invention.
  • Figure 17 is a further alternate embodiment of the present invention.
  • one preferred embodiment of the present invention includes an optical assembly re- ferred to generally by the numeral 12, and a base 14 including an electronic assembly referred to generally by the numeral 14.
  • the optical assembly 12 and the electronic assembly 14 are coupled to one another by a post assembly 16.
  • the post assembly 16 includes a handgrip 18, which in the present embodiment, comprises a foam or rubberized material to permit a sure grip by a user of the preferred embodiment of the present invention.
  • the post assembly 16 may be telescoped to lengthen or shorten its overall length as desired by a user.
  • the optical assembly 12 is coupled to the post assembly 16 by a grooved dovetailed slide 21 which is received by a corre ⁇ sponding dovetail 23 on the underside of the optical assembly 12.
  • the optical assembly may be moved along the dovetail slide 21 and secured at a desired location through the use of a dovetail thumb cam 27.
  • the optical assembly 12 includes a lens mounting bracket 20 for receiving a primary camera lens 22.
  • This lens mount ⁇ ing mechanism is quickly replaceable with a variety of lens mount adapters to accept current and future lenses.
  • the primary camera lens 22 is selected by the director to correspond to the same (or equivalent) motion picture or video lens which will be used during the actual filming of a particular scene.
  • the primary lens 22 illustrated in Figure 1 comprises a zoom lens which is further provided with a zoom lens signal generator 25, which as will be described, provides signals indicative of the zoom posi- tion of the lens to the electronics of the preferred embodiment of the present invention.
  • a removable ground glass relay lens 30 includes visible etched format lines corresponding to the aspect ratio chosen for a particular production, and is received within a barrel-shaped receiving section 32.
  • the barrel- shaped receiving section 32 includes an external rotating barrel 34 having a cutout area 36. By rotating the external barrel 34, the cutout section 36 may be placed over a ground glass removal and installation access port (not shown) , and the ground glass relay lens 30 may be inserted and removed from the receiving section 32.
  • the barrel-shaped receiving section 32 is coupled to an optical housing body 38 which is provided with appro ⁇ priate mounting brackets to accept the various components comprising the preferred embodiment of the present inven ⁇ tion.
  • a sighting tube 42 is coupled to the optical housing body 38.
  • Sighting optics 44 are coupled to the sighting tube 42 permitting a user to view a desired scene through the primary camera lens 22 by viewing the scene through the sighting tube 42 and the ground glass relay lens 30, as will be described.
  • a video camera 50 is coupled to the optical housing 38 through an intermediate lens 52, and permits the simultaneous recording of a scene as viewed by a user sighting through the sighting tube 42.
  • a power/video cable 60 is coupled to the video camera 50 for providing power to the video camera and for providing the output video signal to the electronics of the pre ⁇ ferred embodiment of the present invention.
  • the base 14 is designed to provide a counter-mass balance for the optical assembly 12, and thereby stabilize the preferred embodi- ment of the present invention when gripped at grip 18 by a user.
  • the base 14 accepts and houses the electronic components of the preferred embodiment of the present invention, including a removable transmitter assembly 70 having an antenna 72 to transmit the video signal to a remote receiver and a video recorder.
  • the transmitter assembly 70 also may transmit signals to a remote receive through a microwave link (not shown) .
  • the base 14 further includes a selector switch 74 to permit the user to select one of a number of preset aspect ratio formats provided by a frame line generator disposed within the electronics in the base 14.
  • the electronics are powered by a removable Nicad battery pack 76 which is received in the underside of the base 14.
  • the image of a scene is captured by the primary camera lens 22 and is focused on the ground glass relay lens 30.
  • Light transmitted from the ground glass relay lens 30 is optically coupled to a beam splitter 80, which, in the presently preferred embodiment comprises a 50/50 beam splitter with anti-reflective coatings.
  • a beam splitter 80 In place of the beam splitter 80, it will be appreciated that other functionally equivalent optical elements may be used, such as a prism, pellicle or the like, including combinations thereof.
  • Light which is reflected by the beam splitter 80 is reflected onto a 45 degree turning mirror 82 which results in the light turning 90 degrees, and is received by the intermediate lens 52 coupled to the video camera 50.
  • the video camera 50 comprises a CCD video camera including a CCD element 84 having high pixel resolution. It will be appreciated by one skilled in the art, that a variety of video and still cameras may be utilized using the appara ⁇ tus of the preferred embodiment of the present invention depending upon the application in which the preferred embodiment of the present invention is used. Moreover, various die sizes of the CCD element 84 may be used to accommodate various motion picture or video primary lenses. Light which passes through the beam splitter 80 is passed through the sighting tube 42 and the sighting optics 44 to the user 86.
  • the structure of the preferred embodiment of the present invention permits the user 86 to view the scene through the primary camera lens 22, and to simultaneously record the same scene using the video camera 50.
  • the camera 50 transmits a NTSC/PAL or SECAM video signal over cable 60 to a junction box 90, as shown in Figure 1, where the signal is coupled to a triax cable 92 which passes through the post assembly 16 into the base 14, and is in turn coupled to the electronics disposed therein.
  • the video camera output is then provided to video distribution switches routing the signal through a frame line generator printed circuit board 94, and a character generator circuit board 96, and on to the transmitter assembly 70 for transmission to a remote receiver.
  • the output from the video camera 50 is comprised of a NTSC, PAL or SECAM video signal 100 which is coupled through the junction box 90 to a switch 102.
  • the switch 102 couples the video signal to the input of a character-generator circuit 104, and is also coupled to a graphic generator circuit 106 and a frame line generator 108.
  • the battery pack 76 is coupled to the electronics of the preferred embodiment of the present invention, includ ⁇ ing the character generator 104, the graphic generator 106 and the frame line generator 108, as well as to the transmitter 70.
  • a sensor 110 is provided between the battery pack 76 and to a switch 112, such that during charge of the batteries, switch 112 is opened thereby disconnecting the battery pack 76 from the electronics of the preferred embodiment of the present invention to protect against potential power surges and damage to the circuit components.
  • the Nicad battery pack 76 charges up to 3 amps at 14 volts, and provides a 750 milliamp output.
  • the frame line generator 108 includes a hold circuit 114 which permits the simultaneous generation and insertion of multiple aspect ratio formats in the output video signal provided by video camera 50.
  • a user 86 places switch 74 in a position to select one of the preset aspect ratio formats. The user then presses a hold button activating the hold circuit 114, and may then use switch 74 to select another aspect ratio format for simultaneous insertion in the video output signal .
  • the output of the frame line generator 108, graphic generator 106 and character generator 104 are coupled to the transmitter 70 for transmission to a remote receiver 120. It is contemplated that the transmitter 70 may transmit signals to the remote receiver 120 using radio frequency (RF) microwave, optical or other appropri- ate wavelengths as required by the particular application in which the present invention is used.
  • RF radio frequency
  • the receiver 120 is coupled to a display monitor 122 and a video recorder 124.
  • the principal advantage of transmitting the video signal to a hand held recorder is ease of use by the director and other users .
  • the video signal output is transmitted to the remote receiver 120 and recorded by the video recorder 124.
  • Multiple receivers which may also be coupled to video recorders, can be used to permit the simultaneous viewing of the contemplated scene by camera operators, actors, lighting specialists and others on the set.
  • Upon completion of the scene walk through the director may simply hand the preferred embodiment of the present invention to a camera assistant without having to disconnect cables or other lines.
  • a receiver/recorder combined system such as the Sony ® GV-8 system, having a liquid crystal display screen, may be utilized as both a receiver, monitor and video recorder.
  • the preferred embodiment of the present invention may also be used to transmit high resolution images from the transmitter 70 to a computer base station 125 coupled to the receiver 120 for digitally storing and manipulating the scene images.
  • the digital scene images may be stored on magnetic disc and edited using a non- linear editor 126 such as the Sony "Destiny" ® non-linear editor, or equipment manufactured by AVID ® , among others.
  • the primary camera lens field of view is defined by the outer border 130 which is the limit of the scene as viewed by the lens 22, and also simulates the full aperture view as would be obtained by the motion picture camera to be used.
  • An inner black format line 135 is visible to the user 86, and represents the selected aspect ratio format for the particular production.
  • certain aspect ratios are selected by directors or are required by certain productions.
  • the Super 35 format permits an aspect ratio of 2.35:1 whereas television aspect ratios are 1.33:1.
  • a user 86 when sighting through the sighting tube 42 and the primary camera lens 22 can easily determine how much of the body of ar. actcr 140 or any set elements will fall within the ⁇ eiecte: aspect ratio format by viewing the black format line 13 ⁇ .
  • the user can also view how much of the scene will fall outside of the selected aspect ratio, but still be within the viewing area, and thereby be captured by, the primary camera lens 22.
  • the user 86 may view the contem ⁇ plated scene using the optical assembly of the preferred embodiment of the present invention, and experiment with various motion picture lenses to select the optimum lens for the particular scene.
  • the aspect ratio format line 135 is generated by the ground glass relay lens 30 being etched to have a black border with the appropriate ratio disposed thereon.
  • the frame line generator 108 of the pre- ferred embodiment of the present invention generates a selected aspect ratio format.
  • the selected aspect ratio format has been chosen to be the same as that provided on the ground glass relay lens 30.
  • the frame line generator 108 generates the aspect ratio format and adds a rectangular white border 142 enhancement signal to the NTSC, PAL or SECAM video signal to accent the desired film format boundaries.
  • the frame line generator format image (white video) overlays the etched black lines and is superimposed on the ground glass relay lens 30, thereby rendering the format highly visible on the received video.
  • the use of the frame line generator 108 and the overlay of the frame line generated format image in white video avoids potential problems associated with perceiving the etched black lines on the ground glass relay lens 30 in the video signal, particularly in low light filming conditions.
  • the character generator 104 and the graphic generator 106 may be used to add alpha ⁇ numeric characters to the output NTSC, PAL, SECAM video signal transmitted by the transmitter 70 and received by the receiver 120.
  • a battery indicator graphic 150 has been inserted into the output video signal to permit the viewer to monitor the remaining battery life.
  • the character generator 104 may be used to insert characters representing, for example, the size of the current lens (in Figure 6, 25 mm) being utilized as the primary camera lens 22.
  • a zoom lens signal generator 25 may be provided if a zoom lens is used, and its output coupled to the electronic package of the preferred embodi ⁇ ment of the present invention such that the current zoom position and respective lens focal length is inserted into the video field by the character generator 104.
  • the frame line generator 108 includes a hold circuit 114 wherein the user may select an aspect ratio format, activate the hold circuit 114 and select another aspect ratio format for simultaneous display.
  • the aspect ratio format for Super 35 is illustrated by reference number 142.
  • the television standard aspect ratio of 1.33:1 is illustrated as an overlaid white border 152.
  • the frame line generator 108 further may be selected to provide "half paint" which refers to the dimming of regions of the video image outside of and surrounding the border frame line generator aspect ratio formats being displayed. In Figure 7, this half-painted area is referred to generally by the numeral 156.
  • half-painting allows the director using the preferred embodiment of the present invention to be aware of set pieces, such as microphones or the like, or actors, which may be just out of frame but still present on the video image. Since the director is recording the image as he walks through the scene, such additional background information is very useful to actors who then may view the replay of the scene and check their locations within the field of view.
  • the preferred embodiment of the present invention may be inverted into a "low mode" for additional flexibility in previewing scenes and filming action shots.
  • a bracket 160 receives a support rib 165.
  • Support rib 165 includes a longitudinally extending receiver 166 for receiving a dovetail flange 170 (see Figure 10, and in Figure 1, see dovetail 23) .
  • the optical assembly 12 is thus inverted for use in a low mode.
  • a handle 175 is secured to the bottom of the base 14 and the antenna 72 is inverted. In the low mode configuration, the user holds handle 175 and passes the lens so it stays close to the floor, table, actor's shoulder, or the like, as required by the shot. The user may view the image provided by video camera 50 using the remote receiver 120 and monitor 122.
  • Switches 112 and 102 are placed in an "on" position thereby providing power to the electronic and videc systems of the preferred embodiment of the present inven ⁇ tion.
  • the director further selectively opens or closes switches 105, 107 and/or 109, and selects one or more aspect ratio formats to be inserted into the output signal of the video camera 50.
  • the director may choose to optically view the scene through the sighting tube 42, or alternatively, to view the scene as recorded by the video recorder 124 by holding a hand held monitor 122 coupled to the receiver 120.
  • the director further may adjust the center of gravity for the preferred embodiment of the present invention by sliding the optical assembly 12 along the dovetail mount 23, and securing the optical assembly to the post assembly 16 by camming the dovetail from cam 27.
  • the scene may be walked by the director and viewed, and then subsequently reviewed, by the director as well as others, including camera operators, actors, special effects consultants, and lighting specialists by viewing the images recorded by the video recorder 124.
  • multiple receivers and monitors may be provided on the set such that each of the respective individuals who are required to perform a function during the shooting of the scene are able to simultaneously view the director's walk through. If the director is not satisfied with the location of actors, lighting or desires to substitute a different motion picture lens, he may do so and then re- walk the scene until he is satisfied that all of the necessary elements for a successful shot are present.
  • the director may also invert the optical assembly and place it in a low mode, supporting the assembly using handle 175.
  • FIG 11 illustrates an alternative embodiment which may be employed to facilitate transformations between normal mode and low mode operations.
  • a hand held post 212 is mounted to a base 202 that receives light from an optical body 214 through a lens assembly 215.
  • the hand held post 212 includes an electronic image reversing circuit 216 to correct an image in a right to left orien- tation while the base 202 includes other electronics previously described with reference to Figures 1 and 2.
  • a CCD camera 215 is disposed within the hand held tube 212.
  • a polarized positive lock cap 190 provides for easy transformation to a low mode operation.
  • a door 232 provides for removal of a de-anamorphizer lens assembly and selector mechanism 230, illustrated in Figure 14. The de-anamorphizer lens assembly and selector mechanism 230 provides for the correction of anamorphic lenses prior to image splitting.
  • Figure 12 is a cross section of the embodiment illus ⁇ trated in Figure 11.
  • a pellicle 200 mounted within the optical body 214 may be rotated 90 degrees such that th pellicle 200 may be disposed at an angle of 45 degrees to the incoming light in two different positions.
  • the pellicle 200 is oriented as shown in solid lines in the figure, approximately fifty percent of the incoming light is reflected through the post towards the base assembly.
  • approximately fifty percent of the incoming light is reflected in a direction opposite that of the base assembly 202.
  • Figure 13 illustrates a frame assembly that permits the pellicle 200 to rotate through a 90 degree angle.
  • a pressure tab 206 is coupled to the pellicle 200 and locks into a detent area of a mounted rotating indexer 20 .
  • the pressure tab 206 is coupled to an external lever 202 that may be rotated to cause the pellicle 200 to rotate.
  • the hand held post 212 is coupled to the optical body through an indexing flange 210 and a positive lock ring 208.
  • Figure 15 is an expanded view of the indexing flange 210 and the positive lock ring 208.
  • An outer surface 220 of the positive lock ring 208 may be knurled to enhance finger gripping.
  • the indexing flange 210 includes flange units 222 and 224 of different sizes and the positive lock ring 208 includes a polarizing pin 222.
  • the flange units 222 and 224 and the polarizing pin 222 ensure high precision final orientation of the CCD camera 215 relative to the pellicle 200, as illustrated in Figure 12.
  • the hand held post 212 includes the electronic image reversing circuit 216 to correct an image in a right to left orientation, since the alternative embodiment illustrated in the figure does not include a secondary mirror as disclosed in the embodiment of Figure 1.
  • Top to bottom image orientation is accom ⁇ plished by location of the polarizing pin 222 at opposite poles from the positive lock ring 208 relative to the indexing flange 210.
  • the focus and iris of the CCD camera 215 may be adjusted through two thumb wheel actuators, 218 and 219.
  • Gear splines on the thumb wheel actuators 218 and 219 engage gear splines attached to the CCD camera 215 such that the focus and iris, respectively, of the CCD camera 215 are adjusted when the thumb wheel activators 218 and 219 are manually rotated.
  • the optical body 214 includes the de-anamorphizer lens assembly and selec- tor mechanism 230, as previously described.
  • Figure 14 is a side view of the optical body 214 and illustrates the de-anamorphizer lens assembly and selector mechanism 230.
  • the de-anamorphizer lens assembly and selector mechanism 230 is coupled to the door 232.
  • the de-anamorphizer lens assembly and selector mechanism 230 provides for the correction of anamorphic lenses prior to image splitting.
  • FIG 16 illustrates another embodiment of the present invention.
  • An optical body 242 includes a beam splitter 244 and an intermediate optical assembly 240 that adjusts an image provided to the beam splitter 244.
  • the beam splitter 244 is displaced away from a lens 245 as compared with the embodiments previously described.
  • Light which is reflected by the beam splitter 244 is reflected onto a 45 degree turning mirror 247 mounted above the beam splitter 244 which results in the light turning 90 de ⁇ grees, and is received by an intermediate lens 248.
  • the intermediate lens 248 is coupled to a video camera 249 that, to improve the balance characteristics of the entire assembly, is mounted substantially above a hand held post 243.
  • the hand held post 243 is coupled to a base 241 that stabilizes the entire assembly.
  • FIG 17 illustrates another alternate embodiment of the present invention.
  • An optical assembly 250 includes a primary lens 258 and de-anamorphic lens assembly 260 that provide light to a beam splitter 252.
  • the beam splitter 252 provides light to a 45 degree turning mirror 254 mounted below the beam splitter 252.
  • the turning mirror 254 reflects light to a micro-chip camera and miniature lens 256, mounted proximately to the turning mirror 254, that transmits a video image to remote loca ⁇ tions.
  • light that passes through the beam splitter 252 also passes through secondary lenses 260 and 262 that focus the light for a user.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention concerne un viseur vidéo tenu à la main et permettant simultanément de visualiser une scène et d'enregistrer la scène au moyen d'une caméra vidéo (50). Un ensemble optique (12) comporte un corps de logement optique pourvu d'une monture d'objectif (20) destinée à un objectif primaire (22) de caméra. Cet objectif primaire (22) de caméra est choisi pour correspondre au même objectif cinéma ou vidéo que celui qui sera utilisé pour la prise de vue effective de la scène considérée. Une lentille auxiliaire amovible (30) à dépoli comportant des lignes visibles gravées représentant le format correspondant au rapport de cadre choisi pour la production spécifique s'insère à l'intérieur d'une partie réceptrice (32) en forme de barillet du corps de logement optique. La lentille auxiliaire amovible (30) à dépoli peut s'introduire dans la partie réceptrice en forme (32) de barillet ou s'en retirer. Un viseur tubulaire (44) couplé au corps de logement optique permet à l'utilisateur de visualiser la scène en observant la scène au travers du viseur tubulaire (44), de la lentille auxiliaire amovible (30) à dépoli et de l'objectif primaire (22) de caméra. Une caméra vidéo (50), couplée au corps de logement optique par une lentille intermédiaire (52), reçoit une vue de la scène par l'intermédiaire d'un dédoubleur de faisceau ainsi que d'un miroir tournant disposé entre le viseur tubulaire (44) et de la lentille auxiliaire amovible (30) à dépoli. La caméra vidéo (50) fournit un signal vidéo correspondant à la scène telle qu'elle est vue par l'utilisateur par l'intermédiaire de la lentille intermédiaire (52) et l'objectif primaire (22) de caméra choisi.
EP96912425A 1995-03-24 1996-03-21 Viseur video Withdrawn EP0830781A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US40966795A 1995-03-24 1995-03-24
US409667 1995-03-24
PCT/US1996/003789 WO1996031050A1 (fr) 1995-03-24 1996-03-21 Viseur video

Publications (2)

Publication Number Publication Date
EP0830781A1 true EP0830781A1 (fr) 1998-03-25
EP0830781A4 EP0830781A4 (fr) 1999-04-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96912425A Withdrawn EP0830781A4 (fr) 1995-03-24 1996-03-21 Viseur video

Country Status (4)

Country Link
EP (1) EP0830781A4 (fr)
AU (1) AU5524596A (fr)
CA (1) CA2216254A1 (fr)
WO (1) WO1996031050A1 (fr)

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CA2216254A1 (fr) 1996-10-03
WO1996031050A1 (fr) 1996-10-03
AU5524596A (en) 1996-10-16

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