Method and apparatus for electro-optically convoluting a one-dimensional signal
AssigneeN.V. Optische Industrie "De Oude Delft"
InventorsJacob S. Baumann, Ronald J. Geluk
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Abstract
There is disclosed a method and apparatus for convoluting a signal representing a profile formed during X-ray tomography and a filter function wherein a one-dimensional image of the signal is expanded in a direction transverse to the line by means of an optical system whereby the expanded image is moved past masks in the direction of the line with the masks containing regions that are either fully transmissive or fully non-transmissive.
Claims26
A method for electro-optically convoluting a signal representing a profile formed during X-ray tomography and a filter function which comprises:
- (a) electro-optically reproducing said signal as a line-shaped image having one dimension and having a brightness varying there along;
- (b) converting said line-shaped image into a two-dimensional light beam having a first dimension corresponding to said one dimension and a second dimension corresponding to an expansion of said line-shaped image in a direction transverse to said one dimension;
- (c) moving said two dimensional light beam in a direction corresponding to the one of said line-shaped image passed at least one mask, said mask containing regions fully transmissive or fully non-transmissive to light and representative of said filter function ;
- and
- (d) detecting light transmitted through said mask while said two-dimensional light beam is moved thereacross.
An apparatus for electro-optically convoluting a signal representing a profile formed during X-ray tomography and a filter function which comprises:
- electro-optical means for producing a linear image of said signal in which brightness varies along a longitudinal direction of said image;
- means for converting said linear image into a corresponding light beam which is expanded in a direction transverse to said longitudinal direction thereof;
- at least one mask representative of said filter function;
- means for moving said light beam passed said mask;
- and means for detecting light transmitted through said mask while said light beam is moved thereacross.
An apparatus for convoluting a signal representing a profile formed during X-ray tomography and a filter function, which comprises:
- an image intensifier tube having a deflection coil, said image intensifier tube includes an anode for producing a longitudinally moving linear image of said signal in which brightness varies along said linear image.
- two mirrors having surfaces and mounted at a predetermined angle relative to one another for expanding said linear image transverse to said longitudinally moving linear image and for splitting a light beam into two light beams, said surfaces being in the shape of cylindrical segments;
- at least two mask means representative of a portion of said filter function in each of said two light beams;
- means for detecting light transmitted through each of said mask means to produce an output signal;
- and
- differential amplifier means for receiving said output signal from said detector means and for producing an electric signal representative of convolution.
A method for electro-optically convoluting a signal representing a profile formed during X-ray tomography and a filter function which comprises:
- (a) electro-optically reproducing said signal as a line-shaped image having one dimension and having its brightness varying there along respectively;
- (b) converting said line-shaped image into a two-dimensional light beam having a first dimension corresponding to said one dimension and a second dimension corresponding to an expansion of said line-shaped image in a direction transverse to one dimension;
- (c) projecting said two dimensional light beam through a beam splitter onto a first mask representative of a positive portion of said filter function and onto a second mask representative of a negative portion of said filter function;
- (d) detecting light transmitted through each mask to produce output signals herefrom;
- and
- (e) generating a difference between said output signals to produce an electric signal representative of said profile.
A method for electro-optically convoluting a signal representing a profile formed during X-ray tomography and a filter function which comprises:
- (a) electro-optically reproducing said signal as a line-shaped image having one dimension and having its brightness varying there along respectively;
- (b) converting said line-shaped image into a two-dimensional light beam having a first dimension corresponding to said one dimension and a second dimension corresponding to an expansion of said line-shaped image in a direction transverse to said one dimension;
- (c) projecting said two-dimensional light beam onto a beam splitter including two mirrors for reflection onto a first mask representative of a positive portion of said filter function and onto a second mask representative of a negative portion of said filter function;
- (d) detecting light transmitted through each mask to produce output signals herefrom;
- and
- (e) generating a difference between said output signals to produce an electric signal representative of said profile.
Dependencies are inferred from the claim text.