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1. (CA2072654) VISUAL IMAGE TRANSMISSION BY FIBER OPTIC CABLE
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WO 91/06881 PCT/GB90/0168?
CLAIMS
1. A method of calibrating incoherent optical fibre bundles for use as pseudo-coherent optical fibre bundles for the transmission of visual images, characterised in that it comprises the steps of: defining an address array capable of defining for the optical bundle the position of individual pixels corresponding to the position of the ends of individual optical fibres in the bundle; transmitting a series of test images into the optical fibre bundle, each test image illuminating a substantial proportion of the pixels and the combination of which selectively illuminate each pixel of the address array; analysing the output of the fibre bundle with reference to the transmitted images to produce a reference table of input to output for the fibres; the reference table then being able to be used to de-convolve an image produced at the output end of the fibre bundle.
2. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the address array has dimensions capable of defining the position of individual pixels corresponding to the position of each optical fibre in the bundle.
3. A method of calibrating incoherent optical fibre bundles as claimed in claim 2 characterised in that each fibre position in a bundle of fibres can be mapped by a unique address.
4. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the dimensions of the address array are determined by binary code.
5. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that each of the test images transmitted illuminate half the fibres of the bundle.
WO 91/06881 PCT/GB90/01683
6. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the total number of bits in an X and Y array making up the address array corresponds to the number of test images needed to locate the position of each fibre in the bundle when each test image illuminates half of the fibres.
7. A method of calibrating incoherent optical fibre bundle as claimed in claim 6 characterised in that each test image for either the X plane or the Y plane has all the bits except one set to 0 (not illuminated) and the other to 1 (illuminated).
8. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the test image is provided by screen displayed on a monitor of appropriate resolution.
9. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the test images have setting areas which provide an image of maximum brightness (white) whilst the rest of the screen is set to black.
10. A method of calibrating incoherent optical fibre bundles as claimed in claim 9 characterised in that the areas which are white or black are determined by the address bits in an array.
11. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that illumination of the optical fibres is in the form of vertical or horizontal stripes.
12. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that by processing (addition and/or subtraction) of the received images the output image corresponding to illumination by a single input pixel can be obtained.
13. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that a lens system is used to focus the light output of the test images onto the end of the bundle.
WO 91/06881 PCT/GB90/01683
14. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that a solid state charge coupled device (CCD) camera is used to detect the output of the fibre in the bundle.
15. A method of calibrating incoherent optical fibre bundles as claimed in claim 14 characterised in that the end of the fibre bundle is magnified so that the image received by the camera is as large as desirable.
16. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that the fibre bundle ends are mounted in holders.
17. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that a frame store is used to capture the output image.
18. A method of calibrating incoherent optical fibre bundles as claimed in claim 1 characterised in that a computer is used to analyse the output positions with regard to the transmitted test images and correlate the output to input positions of the individual fibres to create the reference table by which an input image can be reconstructed from the output light signals.
19. A method of calibrating incoherent optical fibre bundles as claimed in claim 18 characterised in that the reference table is constructed as a Look-Up
Table, peculiar to each fibre, which is used to correlate the output signals with the input image and de-convolve the output signals to give the input image.
20. A method of calibrating incoherent optical fibre bundles as claimed in claim 19 characterised in that the Look-up Table is programmed into a programmable device such as a PROM or an EPROM.
21. A pseudo-coherent fibre optic viewing system for a fibre calibrated as claimed in claim 1 which comprises: at least one incoherent fibre optic bundle, having an input end for receiving an image and an output end; a camera to detect signals from the output end of the fibre optic bundle;
WO 91/06881 PCT/GB90/01683
a frame store to capture images from the camera; a translator to de-convolve the image output from the fibre optic bundle and produce a reconstructed picture of the input image and including a device programmed with a reference table specific to the fibre optic bundle in use; and display means to display the reconstructed image.
22. An apparatus for calibrating incoherent optical fibre bundles for use as pseudo-coherent optical fibre bundles for the transmission of visual images, characterised in that it comprises: an address array capable of defining for the optical bundle the position of individual pixels corresponding to the position of the ends of the individual optical fibres in the bundle; a series of test images for transmission into one end of the optical fibre bundle each test image producing a different illumination pattern and each illuminating a substantial proportion of the pixels, the combination of the test images selectively illuminating each pixel of the address array; means to analyse the output of the fibre bundle with reference to the transmitted images; and means to produce a reference table of input to output position for each fibre based on the information provided by the test images to enable an image transmitted along the fibre to be deconvolved.