EP0266819A1
Expired / Lapsed
EP
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Image pickup device
Assignee: Optische Industrie de Oude Delft NV
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Filing: 1987-10-12
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Granted: —
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Expires: 2007-10-12
Abstract
Abstract An image pick up device comprising a two-dimensional matrix of image pick up elements is provided with a difference amplifier at the top of each column of the matrix. Each two pick up elements at the top of a column are coupled to the inputs of the difference amplifier relating to that column to determine a difference signal. An X-ray image system in which an X-ray image is formed of a body under examination is provided with such an image pick up device as a means for detecting the radiation transmitted through the body.
Inventors
- 👤 Hendrik Mulder
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:36
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H04N5/3205
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
Image pickup device comprising a matrix having horizontal rows and vertical columns of image pickup elements and means for supplying clock signals to the matrix of image pickup elements, characterized in that means are provided for the column- wise determination of a signal which is representative of the difference between the image information of one particular image point which is imaged on the image pickup elements of a column and the image information of the subsequent image point in said column.
Claim 2
Dependent Claim
81 words
Image pickup device comprising a matrix having horizontal rows and vertical columns of image pickup elements and means for supplying clock signals to the matrix of image pickup elements, characterized in that means are provided for the column- wise determination of a signal which is representative of the difference between the image information of one particular image point which is imaged on the image pickup elements of a column and the image information of the subsequent image point in said column.
Claim 3
Dependent Claim
28 words
Image pickup device according to claim 1, characterized in that the clock signals are able to transfer the image information in the time-delay-and-integration mode in the column direction.
Claim 4
Dependent Claim
78 words
Image pickup device according to claim 1 or 2, characterized in that means for determining a difference signal are situated at the one end of each column of image pickup elements and in each case comprise two CCD elements each having a number of gate electrodes which are coupled with the clock signals and one floating gate electrode, and in that a drain channel is provided adjacent to the last CCD element in each case in the columns.
Claim 5
Dependent Claim
48 words
Image pickup device according to claim 3, characterized in that means are provided for applying a reset voltage to the floating gate electrodes during each clock signal cycle and means are provided for determining the difference voltage between the two floating gate electrodes during each clock signal cycle.
Claim 6
Dependent Claim
41 words
Image pickup device according to claim 4, characterized in that the means for determining the difference voltage between the gate electrodes comprise a buffer amplifier which is designed to readout the floating gate electrodes from a number of columns in succession.
Claim 7
Dependent Claim
91 words
Image pickup device according to claim 5, characterized in that the output voltage of the buffer amplifier is connected to a readout element which comprises a charge injection channel and four gate electrodes situated next to each other and next to said channel, the first and the third gate electrode being connected to each other and to a first output terminal of the buffer circuit, the second gate electrode being connected to the second output terminal of the buffer circuit and the fourth gate electrode being connected to a fixed potential.
Claim 8
Dependent Claim
84 words
Image pickup device according to claim 1 or 2, characterized in that the means for determining a difference signal at the end of each column of image pickup elements comprise one single CCD element having a number of gate electrodes which are coupled to the clock signals and a single floating gate electrode which is coupled to a charge scanning amplifier and in that means are provided for draining the charge which is present beneath the floating gate electrode during each clock signal cycle.
Claim 9
Dependent Claim
56 words
Image pickup device according to claim 7, characterized in that, during each clock signal cycle, charge which is representative of the image information of one image point is successively transferred to beneath the floating gate electrode, the floating gate electrode is connected to a reference voltage, and the charge beneath the floating gate electrode is drained.
Claim 10
Dependent Claim
83 words
Image pickup device according to claim 7 or 8, characterized in that the charge scanning amplifier comprises a difference amplifier, the non-inverting input of which is connected to a reference voltage and the inverting input of which is coupled to the floating gate electrode and, via a capacitor, to the output of the difference amplifier, a switch being provided for short-circuiting the capacitor during each clock signal cycle in order, in this manner, to couple the floating gate electrode to the reference voltage.
Claim 11
Dependent Claim
66 words
Image pickup device according to at least one of the claims 7 to 9 incl., characterized in that a single charge scanning amplifier is provided for the floating gate electrodes of the CCD elements of a number of columns and in that a switching element is provided in order to couple each of the said gate electrodes successively to the input of the charge scanning amplifier.
Claim 12
Dependent Claim
50 words
Device for forming an x-ray image of a body under examination, provided with an x-ray radiation source and means for detecting the radiation transmitted through the body, characterized in that the detection means comprise an image pickup device according to at least one of the claims 1 to 9 incl.
Claim 13
Dependent Claim
78 words
Image pickup device comprising a row of image pickup elements and means for supplying clock signals to said image pickup elements, characterized in that means are provided for determining a signal for each image pickup element which is representative of the difference between the image information which is imaged during a particular exposure period on said image pickup element and the image information which is imaged on the same image pickup element during the exposure period subsequent thereto.
Claim 14
Dependent Claim
78 words
Image pickup device comprising a row of image pickup elements and means for supplying clock signals to said image pickup elements, characterized in that means are provided for determining a signal for each image pickup element which is representative of the difference between the image information which is imaged during a particular exposure period on said image pickup element and the image information which is imaged on the same image pickup element during the exposure period subsequent thereto.
References Cited (Backward Citations)
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