US3736375A - Process and apparatus for creating codified cartographic representations of variable quantities - Google Patents

Process and apparatus for creating codified cartographic representations of variable quantities Download PDF

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Publication number
US3736375A
US3736375A US00083476A US3736375DA US3736375A US 3736375 A US3736375 A US 3736375A US 00083476 A US00083476 A US 00083476A US 3736375D A US3736375D A US 3736375DA US 3736375 A US3736375 A US 3736375A
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signal
measurement signal
signals
coding
threshold
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B Parnet
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Saint Gobain Industries SA
Compagnie de Saint Gobain SA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0219—Electrical interface; User interface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0403—Mechanical elements; Supports for optical elements; Scanning arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0044—Furnaces, ovens, kilns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/025—Interfacing a pyrometer to an external device or network; User interface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/04—Casings
    • G01J5/047—Mobile mounting; Scanning arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/48—Thermography; Techniques using wholly visual means

Definitions

  • the present invention relates to a process and devices making it possible to obtain a coded cartographic representation of a phenomenon such as luminosity, temperature, etc., capable of being expressed by a characteristic quantity and affecting a given superficial field.
  • the intensity of such a quantity which depends upon the location of the point of measurement, can be expressed by a function S of two coordinates of the different points on the field being examined, for example Cartesian x and y coordinates; moreover, it generally also varies with time t. It is therefore impossible to obtain an overall representation which includes all of these three parameters at the same time, but numerous solutions have been devised for the purpose of obtaining partial representations.
  • a frequently employed solution consists in effecting periodic scanning by means of a pick-up device which effects linear exploration of the field of observation. This solution gives a field which is generally less fine, but it lends itself more readily to long-distance transmission of the image.
  • exploration is decomposed into a succession of horizontal sweeps during the course of which the pick-up scans a line parallel to one of the coordinate axes, the x-axis for example, with these successive sweeps being staggered at frequent intervals by means of vertical" sweep effected in the direction of the y-axis.
  • the scanning done by the transmitter can be achieved by means of electronic processes; this is the solution employed, for example, in television. Recourse can also be had to mechanical processes; this is the solution notably adopted in infrared television or in most radar sets.
  • the vertical scanning is generally periodic; the successive images can be considered instantaneous if the scanning cycle is sufficiently short with respect to the motion of the phenomenon; on the other hand, it can also be continuous and be simply the result of the relative movement of the transmitter with respect to the object examined, with each of the different zones of the field being explored a single time at successive points in time, which in this case provides a spatiotemporal representation.
  • the receiver may for example comprise a dark-trace screen on which electronic sweep constitutes successive images.
  • the data transmitted at this level can be schematized in the form of three synchronized signals: X(t), Y(t) and S(t).
  • X appears in the form of a short-cycle sawtooth signal which causes the horizontal deflection of the elec tron beam in synchronism with the sweep parallel to the x-axis.
  • Y forms long-cycle saw teeth which correspond to the vertical deflection of the beam. It should be noted that their development should theoretically design a stairway in which the length of each step corresponds to the horizontal sweep cycle.
  • S is the measurement signal which expresses the intensity of the phenomenon being analyzed, in accordance with successive sections through planes y constant; it thus appears in the form of a pseudoperiodic signal which is transmitted to the modulation or Wehnelt grid of the receiving tube.
  • the images obtained do not provide directly readable quantified data. If one wishes to obtain a measurement rapidly, it is necessary to employ another mode of representation. It is quite easy, for example, periodically to transmit two signals corresponding to X and S on the deflection controls of an oscilloscope, so as to trace on its screen, for different values y, of y, the curve S(s,y representing outlines parallel to the x-axis.
  • a second approach consists in making horizontal sections corresponding to suitably selected predetermined values of the intensity S; this leads to a cartographic, or more correctly orographic, representation of the phenomenon. It suffices to trip off the transmission of a secondary signal each time the value of S goes beyond selected thresholds, in order to engender on the viewing screen, during the course of a complete scanning cycle, a corresponding contour line.
  • the orographic image may be superimposed on the visual image, but visibility becomes mediocre; it can also purely and simply be substituted for it, but in this case it would be necessary, even if only for the purpose of distinguishing the troughs from the peaks, to be able to identify the lines, for example by numbering them on the screen, a possible but complicated solution.
  • the procedure which constitutes the solution according to the invention consists in effecting generally rectangular scanning of the field and ascribing code numbers to the values of the characteristic intensity of each zone included between two successive thresholds, crossed by the said intensity, by means of a simple black-and-white signal; in other words, substituting for S a jagged or pulsing signal Z of sufficient cycle or frequency in order to be visible on the image, the form of which is different in each of the threshold intensity zones considered, each sweep line thus forming a broken line of hachures which differs from one threshold zone or range to the next.
  • each coding signal Z is sent out by an outside clock or generator in synchronism with the sweep signal X and tripped independently of the code signal passage permissions or AND gates, with each threshold range appearing in the form of hachures representative of the base or coding signal.
  • the division of the horizontal scanning cycle by the code signal cycle results in a different remainder from one zone to the next; thus, the hachures produced during successive scanning or sweep cycles are horizontally offset to give the effect of inclined hatch lines, the inclination of said lines being different in each range.
  • the thresholds can be adjusted to various levels; thus, the sensitivity of the apparatus is adjustable and the number of ranges appearing in the field of observation is capable of remaining constant so as to make a satisfactory reading possible.
  • a secondary impulse is sent out when a selected threshold is crossed; thus only one the threshold level representation is superposed upon the hachure representation and gives the measurement reference level.
  • the measurement signal S momentarily replaces the Y signal once per scanning cycle, with the receiver then operating as an oscilloscope.
  • a temperature contour located in an appropriately chosen plane 1 is then superimposed on the hachure image in order to facilitate its interpretation.
  • This form of embodiment can be utilized, with possible changes in detail, for other technological fields, and in particular for the measurement of the temperatures in the mechanical or thermal processing of metallic parts, for example, or for the measurement of temperatures within an enclosed space, but also for the recording of measurements of relief, electromagnetic fields, etc.
  • FIGS. 1 and 2 plan and end-on views, respectively, of the transmitter
  • FIG. 3 curves representing signals W, X, Y and S;
  • H6. 4 a drawing of the device transforming the S signal into a coded signal
  • FIG. 5 a drawing of the circuit controlling the ing tube
  • FIG. 6 a drawing pertaining to the synchronization of a coding signal Z with the W signal
  • FIG. 7 a diagram showing the zones corresponding to the areas of the ribbon of glass in which the temperatures are comprised within different thresholds
  • FIG. 8 a temperature chart for a ribbon of glass upon leaving a drawing well.
  • successivelyceivsive transverse lines of a moving ribbon of glass are examined as they pass through a given plane.
  • An infrared-sensitive cell is placed above the ribbon at the output of a flattening oven 11.
  • This cell provided with an optic l2, observes a narrow field within a range of wavelengths of from 3 to 8 microns, and revolves at the velocity of 960 revolutions per minute about a horizontal axis V located in the median plane of the ribbon. It examines the line uu' in successive spots during approximately one'fifth revolution and thus effects a transverse sweep of the glass ribbon; thus the variation in its transverse temperature contour is detected at each such line.
  • the glass ribbon moves along at a speed of the order of 5 meters per minute, which results in its being scanned longitudinally; the fineness of the field thus corresponds to a pitch of the order of 5 mm.
  • the more traditional method is to use an ordinary cathode ray tube, but the sweep is too slow in that case to permit direct observation; thus the temperature chart will be obtained by the prolonged exposure of a photographic film, with the exposure time corresponding to the duration of vertical scanning Y.
  • the camera 13 will not'be described in detail, since its operation is not directly related to the invention. It shall suffice to know that, in addition to the S signal, it supplies only a scanning signal H and passage permission or triggering signal W for signal H from which sawtooth signal X is developed. Thus a signal Y, having a suitable cycle and uniform mean slope, must be generated separately.
  • a feature of the invention is that the camera revolves in synchronism with the emission of coding signals which form the signal Z, i.e., without any phase drift with respect to them; with a view to achieving this result rigorously, one can synchronize all the components by means of a master clock, but a simple, satisfactory solution is to drive the revolving cell by means of a stabilized directcurrent motor.
  • the period of the X signal is 62.5 ms and corresponds to the scanning or writing of a line.
  • the permission or triggering signal W makes it possible to limit the sawtooth of the X signal to the'time during which the optic head, observing the object under examination, supplies the S signal, or approximately 12 msDuring other operating times the X signal is reduced to a horizontal of zero intensity.
  • the Y signal is generated separately; the cycle of the sawtooth which constitutes it is 12 seconds, for example, and corresponds to the recording of a complete image on the screen of the receiver; it determines the lengths of the successive sections of ribbon examined, of the order of l m, for example, and when signal Y falls back down, this brings about the erasure of the memory stored.
  • the device which transforms the analog signal S into a coded pulsing signal 2 in accordance with the invention may be constituted as shown in FIG. 4.
  • a series of adjustable generators supplies the desired coding signals Z the frequency of which is of the order of approximately 10 kHz; they might be, for example, eight in number, indicated as z, to Z thus determining eight coding ranges.
  • the S signal furnished by the camera is analyzed by a series of seven threshold amplifiers s k to s 7a. Each of these amplifiers delivers two complementary signals s,- and E-"(Booles notation) according as the intensity of the S signal is greater or lower than a selected threshold value.
  • the combined presence of the triggering signals, here 3 and Z permits only the impulses emitted by the impulse generator 13 to cross the corresponding permission circuit on AND gate ET 3, while the absence of gsignals in the ET permission or AND gate circuits of a lower order and the absence of s, signals in the ET or AND gate circuits of a higher order inhibit the passage of the other coding impulses.
  • the entire set of threshold circuits feeds a mixer stage OU which dispatches signal Z here Z toward the cathode ray tube.
  • One of the threshold amplifiers, s 4/5, for example, is selected to provide a reference.
  • the two signals 5 and 5 supplied by this threshold amplifier are directed toward two monostable oscillators such as m49 and m50.
  • Each passage of S by the corresponding threshold value causes the triggering of 5 or 5 from to l and trips the corresponding monostable oscillator which delivers a short impulse of adjustable duration; this impulse, sent also to the receiver by circuit OU is superimposed on the output of the successive Z, signals in order to represent the reference isotherm on the screen point by point.
  • FIG. shows the wiring diagram of the receiver tube 90.
  • the signal X resulting from the combination of H and W in a permission or AND gate circuit ET 80 is sent to the horizontal deflection grid 91.
  • the device which transforms the S signal into a coded signal Z in accordance with the invention is schematized here at 81 and Y signal is elaborated at 82.
  • the vertical deflection grid 92 and the modulation control grid 93 are fed respectively through the gate 83 83' by signals Y and Z, so that the cathode tube operates as a picture tube.
  • the Y signal is likewise sent out to a threshold amplifier s 84 which supplies either signal Y, or Y depending upon whether Y is greater or less than a preselected reference value Y,.
  • a threshold amplifier s 84 which supplies either signal Y, or Y depending upon whether Y is greater or less than a preselected reference value Y,.
  • These two signals are respectively directed toward monostable circuits m85 and m86 so that when Y passes through the value Y a short pulse is produced which momentarily trips the gate 83 83.
  • the grids 92 and 93 are then fed respectively by signals S and W, which signifies that during this short period the tube operates as an oscilloscope, so that one of the horizontal sweeps, corresponding for example to the median line 97 of the image, is replaced on the screen by the corresponding S signal contour 96.
  • the form of the Z,- pulses supplied by each of the z,- generators may be selected more or less arbitrarily, and since their rate is independent of the formation of the contour lines of hachures, it can easily be adjusted in such a way that the phase shifts f to f are different from one another, which will result in a difference in the inclination of the hachures as viewed in FIG. 7.
  • FIG. 7 represents first of all a signal S (yo) successively crossing the three thresholds s s reference threshold, and s 4/5, as well as the series of signals Z (y0) to Z (y0) which come one after the other to take the place of signal S(y0). It also illustrates the scanning line L0 generated by the emission of the successive Z(y0) signals, and the following lines L to L which give rise to the generation of the hachures inclined lines of.
  • FIG. 8 shows the temperature chart for a ribbon of glass as it issues from a drawing well.
  • a process for obtaining a coded cartographic representation of a phenomenon such as luminosity, temperature, and the like, susceptible of expression by a characteristic quantity and concerning a given superficial field which comprises scanning the field to generate a measurement signal characteristic of the intensity of the phenomenon, generating independently of the measurement signal a plurality of coding signals differing in form from each other, and selectively applying said coding signals one at a time to a common outlet in response to selected threshold values of the measurement signal, whereby each coding signal applied to the outlet is representative of a range or zone of measurement signal values between successive threshold values of the measurement signal.
  • a process as defined in claim 1, comprising the step of applying the coding signals on said outlet to the modulation control grid of a cathode ray tube to create hachures on the screen thereof.
  • a process as defined in claim 2 which comprises applying a pulse signal to said common outlet when the measurement signal attains a selected threshold value, whereby to create a contour line on the screen of the tube representative of said selected threshold value.
  • a process as defined in claim 2 comprising intermittently momentarily applying the measurement signal to the vertical deflection grid of the tube while applying a constant signal instead of the coding signals to the modulation control grid to create a contour line representative of the measurement signal values.
  • a process as defined in claim 7 comprising the step of momentarily interrupting the connections to the modulation control grid and the vertical deflection grid, and momentarily connecting the same to receive said measurement signal and a constant signal, respectively, whereby said tube functions momentarily as an oscilloscope to create a trace representing the magnitude of said measurement signal.
  • a process as defined in claim 9 which comprises applying an additional electrical signal pulse to the modulation control grid of said tube whenever the value of the measurement signal attains a predetermined threshold value to thereby create a generally vertical trace on the memory screen.
  • said signal pulses are created by utilization of monostable oscillators connected to complementary outputs of a threshold amplifier responsive to a predetermined threshold value of the measurement signal.
  • a process as defined in claim 7 which includes controlling the connection between each code signal generator by means of an AND gate responsive to predetermined values of the measurement signaL.
  • a process as defined in claim 12 which includes feeding code signals from said AND gates through a common mixer OR gate.
  • a process as defined in claim 12 comprising energizing complementary control terminals of pairs of said AND gates in response to the measurement signal throughparallel connected threshold amplifiers each responsive to said measurement signal at different threshold values thereof and adapted to deliver complementary output signals to said control terminals.
  • Apparatus for creating a codified cartographic representation of a phenomenon such as luminosity, temperature and the like, which is susceptible of ex pression by a characteristic quantity and variable over a superficial field comprising a cathode ray tube having horizontal and vertical deflection grids, a modulation control grid and a memory screen, means for cyclically scanning said field successively along transverse longitudinally spaced lines and for generating an electrical measurement signal during each scanning cycle the magnitude of which varies in accordance with the magnitude of said phenomenon from point to point along said lines, a plurality of coding signal generators, the output signals of which are independent of the measurement signal, means responsive to the measurement signal at selected magnitude thresholds thereof for selectively connecting the outputs of said coding signal generators to said moudulation control grid, and means for supplying a first sawtooth signal to said horizontal deflection grid and a second sawtooth signal to said vertical deflection grid in timed relation with the scanning means cycle.
  • Apparatus as defined in claim 16 comprising means responsive to a selected magnitude of said second sawtooth signal for momentarily connecting the vertical deflection grid to receive only the measurement signal and simultaneously connecting the modulation control grid to receive a constant signal in lieu of the coding signals.
  • Apparatus as defined in claim 15 comprising an AND gate for controlling the output of each coding signal generator, and a plurality of threshold amplifiers connected in parallel to receive the measurement signal and being responsive to selected threshold magnitudes of the latter, each said amplifier being capable of delivering one signal to a control terminal of one of said AND gates when the magnitude of the measurement signal is below a selected value, and a complementary signal to a control terminal of another of said AND gates when the magnitude of the measurement signal is above said selected value.
  • Apparatus as defined in claim 18 comprising means including a mixer OR gate for connecting said AND gates to a common output conductor.
  • Apparatus as defined in claim 18 comprising means responsive to the signals delivered by at least one of said amplifiers for applying a pulse to said modulation control grid whenever the" measurement signal attains the selected threshold magnitude to which the amplifier is responsive.
  • means for generating a measurement signal characteristic of a variable phenomenon means for generating a measurement signal characteristic of a variable phenomenon, a plurality of threshold amplifiers connected in parallel to said generating means, each said amplifier being responsive to a different threshold value of the measurement signal and being adapted to deliver two complementary signals on different outlets depending upon whether the value of the measurement signal is greater or less than the threshold value to which the amplifier is responsive, a plurality of coding signal pulse generators, means including an AND gate connected to the output of each coding signal generator for selectively connecting the latter to a common conductor, and means for connecting the output terminals of said amplifiers to control terminals of said AND gates, whereby a different AND gate is rendered conductive for each range of measurement signal values between the successive threshold values to which the amplifiers are responsive.
  • each of the output terminals of at least one of said threshold amplifiers is connected through a rnonostable oscillator and said mixer OR gate to said common conductor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Radiation Pyrometers (AREA)
US00083476A 1969-10-27 1970-10-23 Process and apparatus for creating codified cartographic representations of variable quantities Expired - Lifetime US3736375A (en)

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FR6936743A FR2063669A5 (enrdf_load_stackoverflow) 1969-10-27 1969-10-27

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FR (1) FR2063669A5 (enrdf_load_stackoverflow)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5062720A (enrdf_load_stackoverflow) * 1973-10-05 1975-05-28
US4240107A (en) * 1979-03-16 1980-12-16 Hajime Industries, Ltd. Apparatus and method for pattern information processing
WO1981003592A1 (en) * 1980-05-27 1981-12-10 Commw Scient Ind Res Org Brightness analyser
EP0057290A1 (en) * 1981-02-02 1982-08-11 Hoogovens Groep B.V. Temperature scanner
US4482923A (en) * 1979-07-31 1984-11-13 Dr. Ing. Rudolf Hell Gmbh Method for autotypical tonal value analysis

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US3214515A (en) * 1958-11-24 1965-10-26 Eberline Instr Corp Image contour plotter
US3258528A (en) * 1963-06-18 1966-06-28 Gen Precision Inc Converter for changing a black and white television signal to a color television signal
US3294896A (en) * 1963-07-24 1966-12-27 Bell Telephone Labor Inc Digital encoder for facsimile transmission
US3337684A (en) * 1965-02-23 1967-08-22 Ball Brothers Co Inc Television monitoring apparatus having dual function as picture monitor and oscilloscope
US3354266A (en) * 1964-05-25 1967-11-21 North American Aviation Inc Isophote converter
US3432661A (en) * 1964-03-11 1969-03-11 Atomic Energy Authority Uk Apparatus for examining the internal structure of a body
US3441667A (en) * 1964-07-29 1969-04-29 Philips Corp Radiographic display device with areas of interest set off with marking pulses
US3503689A (en) * 1965-10-18 1970-03-31 Technical Operations Inc Microdensitometer
US3580995A (en) * 1968-04-29 1971-05-25 Rca Corp Constant sized halftone dot image generator
US3604846A (en) * 1969-03-03 1971-09-14 Mead Corp Method and system for reconstruction of half-tone images

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214515A (en) * 1958-11-24 1965-10-26 Eberline Instr Corp Image contour plotter
US3258528A (en) * 1963-06-18 1966-06-28 Gen Precision Inc Converter for changing a black and white television signal to a color television signal
US3294896A (en) * 1963-07-24 1966-12-27 Bell Telephone Labor Inc Digital encoder for facsimile transmission
US3432661A (en) * 1964-03-11 1969-03-11 Atomic Energy Authority Uk Apparatus for examining the internal structure of a body
US3354266A (en) * 1964-05-25 1967-11-21 North American Aviation Inc Isophote converter
US3441667A (en) * 1964-07-29 1969-04-29 Philips Corp Radiographic display device with areas of interest set off with marking pulses
US3337684A (en) * 1965-02-23 1967-08-22 Ball Brothers Co Inc Television monitoring apparatus having dual function as picture monitor and oscilloscope
US3503689A (en) * 1965-10-18 1970-03-31 Technical Operations Inc Microdensitometer
US3580995A (en) * 1968-04-29 1971-05-25 Rca Corp Constant sized halftone dot image generator
US3604846A (en) * 1969-03-03 1971-09-14 Mead Corp Method and system for reconstruction of half-tone images

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5062720A (enrdf_load_stackoverflow) * 1973-10-05 1975-05-28
US4240107A (en) * 1979-03-16 1980-12-16 Hajime Industries, Ltd. Apparatus and method for pattern information processing
US4482923A (en) * 1979-07-31 1984-11-13 Dr. Ing. Rudolf Hell Gmbh Method for autotypical tonal value analysis
WO1981003592A1 (en) * 1980-05-27 1981-12-10 Commw Scient Ind Res Org Brightness analyser
EP0057290A1 (en) * 1981-02-02 1982-08-11 Hoogovens Groep B.V. Temperature scanner
US4439049A (en) * 1981-02-02 1984-03-27 Estel Hoogovens B.V. Temperature scanner

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FR2063669A5 (enrdf_load_stackoverflow) 1971-07-09

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