referring now to fig1 a display source and servo / optical assembly 10 ( somewhat analogous to the assembly 40 shown in fig3 of the aforementioned u . s . pat . no . 4 , 634 , 384 ,) is shown . apparatus 10 includes a background projection means 11 and an area - of - interest ( aoi ) projection means 12 for forming an image of a high - resolution area to be inset into the relatively low - resolution scene projected from projection lens 11a of the background projector . an optical combination means 14 , such as a beamsplitter and the like , receives the background scene illumination from lens 11a , and the inset area illumination from projector means lens 12a , and provides the blended illumination via a common relay means 16 , such as a lens and the like , to servo &# 39 ; d optical means 18 . this means 18 includes a projection lens means 19 , within a housing 19a which is slewed and moved in elevation ( as shown by arrows a ) by an elevation drive / sense means 20a and in azimuth ( as shown by arrows b , into and out of the plane of the drawing ) by an azimuth drive / sense means 20b , to allow a blended scene to be projected upon a viewable area . in accordance with one aspect of the present invention , the combined optical image from beamsplitter 14 is relayed by lens means 16 to the input surface 22a of a fiber - optic element 22 . the image is passed along flexible fiber - optic element 22 and appears at the output 22b thereof , for projection through lens means 19 . the fiber - optic element 22 comprises a bundle of optical fibers 22f , each having a proximal end 22p maintained and positioned by a first fixing means 22c . each fiber 22f also has a distal end 22d which passes through an aperture 19b in the projection housing 19a ( and may be buffered therefrom by a resilient washer 19c and the like ) and ends at the output surface 22b . another clamping means 22e fixes the fiber distal ends substantially permanently into a fixed positional relationship . it will be seen that the image illumination projected into input surface 22a is emitted out of output surface 22b , even as the projection head 18 is slewed through all combinations of elevation and azimuth , due to the flexible nature of the fiber - optic element 22 . this flexible fiber - optic element 22 needs a minimum of mechanical support along its length and effectively removes the necessity for precision optical elements , such as the fold mirror 62 and half - angle mirror 64 , normally needed between the beamsplitter and the projection lens , as shown in fig3 of the aforementioned &# 39 ; 384 patent . prior art systems typically required a de - rotation prism ( shown as optical element 60 and fig3 of the aforementioned &# 39 ; 384 patent ), to remove image rotation engendered by slew of the servo &# 39 ; d optics . this relatively costly optical subassembly , and its required precision mounting assembly , are not required in my novel aoi system ; while not required in this invention ( because no rotation will be induced by a non - existent gimballed mirror assembly ) a rotational drive / sensing means 24 ( which may be unitary or comprise a plurality of portions , e . g . a pair of rotational dr / sns portions 24a and 24b ) may be provided if it is desired to cause the distal end 22d of the fiber - optic element in fixing ring 22e to rotate , in the direction of arrows c about the axis of the fiber - optic element in surface 22b , and thus rotate the orientation of the output image , with respect to the orientation of the image input at surface 22a . the image rotation property is further shown in fig2 a , in which the view in the direction of arrows w -- w ( towards the fiber - optic element output surface 22b ) is shown ; the individual fiber - optic elements 22f are not shown , as these elements will typically be of very small diameter , and a multiplicity ( at least several thousand ) of these elements will be combined in each element &# 34 ; cable &# 34 ; 22 to transport a coherent image . it should be understood that , while the fiber - optic element is shown with a circular cross - section or input / output face configuration , other symmetric or asymmetric shapes can be as equally well utilized . regardless of the cross - sectional geometry selected for a particular use , if the illumination provided to the input surface 22a has a particular orientation ( as illustrated by the exemplary arrow 22a &# 39 ;) in a head - up vertical orientation , rotation of distal end ring 22e can cause the output surface 22b illumination to have an orientation exactly duplicating the input and illumination orientation ( as shown by image arrow 22b &# 39 ;, identical with input arrow 22a &# 39 ;), or at some rotational offset ( as shown by rotated arrows 22b &# 34 ;, 22b &# 39 ;&# 34 ;, 22b &# 34 ;&# 34 ; and so forth ). thus , if rotation drive sense means 24 is originally indexed for 0 rotation ( as represented by arrow 22b &# 39 ;), some initial rotation in a first selected direction ( say 30 in the clockwise direction ) causes the input information 22a &# 39 ; to exit as rotated output information 22b &# 34 ;. further rotation ( say through a total angle of about 90 clockwise ) causes input information 22a &# 39 ; to exit with another output orientation 22b &# 39 ;&# 34 ;. the total amount of rotation ( through at least 360 , if required ) will be determined by the particular use . in accordance with another principle of the present invention , projection focusing is carried out by movement of the fiber - optic element distal surface 22b to a desired location between a first limit position 22b , furthest from projection lens means 19 , and a second limit position 22b &# 39 ;, closest to projection lens means 19 , by use of focusing means 26 . focusing means 26 includes a focus sense means , having one or more sensor components 26a / 26b , and a movement means 26c actuated by components 26a / 26b for moving the ring - rotation means 24 , and its associated fiber - optic element retaining ring 22e ( with cable distal end 22d attached ) toward or away from projection lens means 19 , in the direction of arrows d . thus , fiber cable movement means 26 does not have to move any mirrors or other precision optical components ( such as a projection lens means 19 itself ) nor is movement of the entire projection head means 18 required ; consequently , focus means 26 may be of less cost and complexity than the focus means previously utilized in an aoi cig display system . in accordance with another aspect of the present invention , even if fiber - optic element 22 is not utilized , another fiber - optic element 28 can advantageously be utilized to provide even greater flexibility in the blending of high - definition inset visual information into a relatively low - definition background scene . as taught in the &# 39 ; 384 patent , the background scene illumination is passed through a background ( bg ) intermediate image filter which is substantially transparent , except in the area of an outtake blockage region 30a as seen in the direction of arrows x -- x , ( see fig2 b ) which is advantageously surrounded by a transition region 30b of decreasing transmission as opaque 30a is approached . another ( aoi ) intermediate image filter 32 is substantially opaque as seen in the direction of arrows y -- y , ( see fig2 c ) except for a substantially transparent area 32a , of size and shape substantially complimentary to opaque area 30a and intermediate filter 30 ; area 32a is surrounded by an increasingly - transmissive transition region 32b , which is substantially complimentary to increasingly - opaque transition area 30b . by having the center of the areas 30a and 32a coincide in an image combined by beamsplitter 14 , the opaque area 30a removes the low - resolution background illumination and allows the high - resolution aoi illumination information to be inset by transparent area 32a into the same portion of the total image . this combined blended illumination information is projected by the subsequent portions of system 10 . hitherto , the opaque area 30a and transparent area 32a have been substantially in the center of the intermediate image filters 30 / 32 and these filters have been positionally fixed with respect to beamsplitter 14 , so that the optically - blended image required that the subsequent projection system be slewed in a servo - tracked manner to provide a dynamically changing blended image . this placed a relatively high burden on the drive system ( e . g . the elevation and azimuth drive - sense means 20a / 20b ) utilized to move projection head means 18 . here , i achieve image combination in the same manner , but with each of the background intermediate image filter 30 and inset image filter 32 having only a relatively small complimentary area ( area 30a in filter 30 and area 32a in filter 32 ) which are moved in unison by a blend translation drive / sense means 34 . plus , if an area of high - resolution information is to be inset , for example , in the upper left corner of the scene ( because the user &# 39 ; s eyes and head have slewed to that upper left corner ), the entire projection head 18 need not be so slewed , but rather the opaque obscuration area 30a of the background image filter can be moved to the upper left corner ( as shown in fig2 b ) by the blend translation drive sense means 34 , removing the low - definition information in that area . simultaneously , the high - definition image filter mask element 32 is also moved so that its transparent area 32a is centered on the same portion of the relative screen , by mechanical connection to means 34 , and by movement in the same directions of arrows e . it will be seen that while the obscuration of a small portion of a low - definition image can be adequately carried out by two - dimensional movement of the masking image filter 30 , insertion of high - definition information at a particular location cannot be carried out by mere movement of a spot - transmissive masking filter 32 alone . the high - definition information input through spot 32a must closely track that spot ; normally this would require placing aoi inset projector means 12 with its lens means 12a at a fixed location with respect to mask area 32a , so that the entire bulk of means 12 must be translated along with filter mask 32 . however , i have found that the inset projector means 12 can be maintained in a fixed location , by installing the fiber - optic element 28 to have its input surface 28a , at its proximal and 28b , receive the illumination output from projector lens 12a , and with the fibers 28f flexibly connecting proximal end 28b to distal end 28c , so that the output surface 28d can be placed at the proper fixed location with respect to image mask transparent area 32a , and fixedly maintained thereat by a holding means 30 . it will be seen that the translucent area 32a of the inset mask 32 can be translated , as shown by arrows e , to anyplace within the inset plane ( e . g . the input plane to the bottom surface of beamsplitter 14 ) with movement only of the distal end of fiber - optic cable 28 and without movement either of the proximal end of that cable or of the inset projector means 12 . thus , the inset mask is fixed at the image plane of the fiber - optic element output , whereas the background mask is placed at an intermediate image plane prior to the combining optics . since the inset image can be moved laterally ( i . e . in the same plane as the image plane ), the inset can move within the background field of view without suffering any relative geometry changes , such as keystoning or magnification . thus , the background image mask can be moved in its own image plane in a one - for - one manner with the inset image . the optical blend provided by this approach is capable of being moved throughout the entire background field - of - view with the blend quality remaining identical to a baseline blend , with the exception of any displacement errors between the background and inset masks occurring during movement . as the masks are relatively small in size , and have a limited displacement range , a high degree of accuracy can be achieved at relatively low cost with relatively simple servo control . the relative displacement of the masks may be imperceptible to the system user . the small size and displacement of the insetting mechanism allows for higher rates and accelerations to be achieved , particularly in comparison with conventional gimbal slewing projection optics . i presently prefer a configuration in which the combined background / inset field of views are slewed together at head - tracked rates and accelerations , and the inset is displaced relative to the background at eye - tracked rates and accelerations ; this provides a cost effective solution to the problem to achieving high - resolution inset rates and accelerations greater than the current state of the art . it will be understood that , while areas 30a / 32a and surrounds 30b / 32b are shown with elliptical shape , other shapes can be equally as well utilized . referring now to fig3 and 3a , a portion 40 of a projection system allows multiple video inputs , from each of a plurality of projection means 41 , 42 and / or 43 , to be combined to provide additional resolution , brightness and / or projected field - of - view . it is well known to the art to utilize classical optical methods ( e . g . masks in conjunction with beamsplitters and the like ) to combine several images containing different information , from different sources ( e . g . video channels ), for output to a common objective lens . in projection systems where such multiple image output through a common objective lens is required , optical throughput efficiency is typically reduced by a factor of 50 percent for each 1 : 1 image combination . as an example , data for forming the indicia &# 34 ; j &# 34 ; is provided at a first projector data input 41a , while data for forming the indicia &# 34 ; h &# 34 ; is provided at data input 42a of a second projector means , and data for forming the letter &# 34 ; m &# 34 ; is provided at the input 43a of the third projector means . the j / h / m illumination patterns are provided at the respective projector output means 41a / 42a / 43a , to the respective input surfaces 45a / 46a / 47a of the respective fiber - optic elements 45 / 46 / 47 . the first cable has a proximal end 45b which can be maintained by a fixing ring element 45c ; in a similar manner proximal end 46b or 47b of fiber cable 46 or 47 is maintained by an associated fixing element 46c or 47c . the respective fibers 45f / 46f / 47f of the respective cables 45 / 46 / 47 are combined into a single cable 48 , having a distal end 48a which is fixed by a member 48b , so that a common fiber - optic cable end 48c provides a combined output image to a common objective lens means 50 . the mosaic of fiber - optic elements are here manufactured in such a manner so that the fiber array output surface 48c provides ( see fig3 a ) the channel images 48ca , 48cb and 48cc adjacent to one another , without requiring the use of beamsplitter devices . it will be seen that the output image can have a portion , e . g . center portion 48cb , which is magnified with respect to the size of its input image ; note also that the output of at least the projector ( e . g . projectors 41 and 42 ) can be spatially rotated by imparting a twist in the associated cable ( e . g . cable 45 and 46 ). also , the various image portions can be physically separated and acted upon in order to magnify , vary the resolution , brightness and / or field - of - view , as required . this may be provided by suitably shaping the input surface ( e . g . surface 45a or 46a ) to various arcuate formations , in the fiber - optic element input proximal ends . this concept can be further extended to provide variable acuity image mapping in which high - resolution imagery can be concentrated in the center of the viewing area of the area - of - interest projection system , with resulting lower resolution image replaced on the scene periphery . normally , a linear raster form of system projector can only provide a discrete transition between high - resolution and low - resolution imagery . however , the most effective use of video information for aoi projection system occurs when the resolution through the optical system falls off in gradual radial manner across the projected field - of - view . while variable acuity lens mappings have been attempted using conventional hard optical elements , the results have been less than satisfactory due to limiting color aberrations , luminous fall - off and high manufacturing costs . the fiber - optic element 45 - 48 allows stretching , tapering , twisting and the like , during manufacturing , so that a multitude of unique and distorted output formats can be achieved . in addition , input and / or output surfaces can be shaped , as by grinding , etching and the like , into concave , convex or compound surfaces , so that a controllable acuity change can be achieved in the fiber - optic element . by coupling such a fiber - optic cable to a linear projection source , a non - linear output image format can be achieved . the fiber - optic element acts as a &# 34 ; zero depth &# 34 ; window so that the output image does not suffer from the color anomalies typically found when using a hard optics approach . a clean , color - corrected image plane will thus be present at the fiber - optic cable output surface and illuminance will fall off in direct proportion to the change in area of the fiber size from input to output . while several presently preferred embodiments of my novel invention have been set forth herein by way of description , it will now become apparent , to those skilled in the art , that many variations and modifications of an image projection system utilizing fiber - optic cable elements for replacement of various precisely maintained and ground hard optic elements , can be provided . it is my intent , therefore , to be limited only by the scope of the appending claims , and not by the specific details and instrumentalities presented by way of example herein .