Method and apparatus for processing and recovering images
First Claim
1. A method of displaying a selected zone of successive images belonging to a sequence of video images, each in the form of a matrix of pixels, on a display unit, comprising the steps of:
- (a) providing a signal originating from at least one fixed large-field camera having a resolution that is greater than that of said unit and representing said video images;
(b) dynamically and optionally selecting, at any place in the camera field, and designating a zone having a width/height ratio corresponding to that of the display unit in said video images; and
(c) generating pixels of modified images representing said selected zone, having a size and the resolution of the display unit by interpolation from the pixels in the selected zone of the video images;
further comprising, between steps (a) and (b), designating a target of constant size and position in the image of the scene viewed by the fixed camera; and
processing the signal delivered by the camera by inlaying a stored pattern into said image in place of the target.
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Abstract
For displaying a selected zone of images belonging to a sequence of video images, each in the form of a matrix of pixels, on a display unit, a signal is generated by a fixed large-field camera having a definition that is greater than that of the display unit. A TV user or an operator at a control station selects a zone of format corresponding to that of the display unit in a field of view of the camera. The pixels of a modified image having the size and definition of the display unit are generated by interpolation from the pixels in the selected zone of the image supplied by the large-field camera. A device for implementing the method includes a module for warping the selected zone by operations of interpolation and resampling.
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Citations
9 Claims
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1. A method of displaying a selected zone of successive images belonging to a sequence of video images, each in the form of a matrix of pixels, on a display unit, comprising the steps of:
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(a) providing a signal originating from at least one fixed large-field camera having a resolution that is greater than that of said unit and representing said video images;
(b) dynamically and optionally selecting, at any place in the camera field, and designating a zone having a width/height ratio corresponding to that of the display unit in said video images; and
(c) generating pixels of modified images representing said selected zone, having a size and the resolution of the display unit by interpolation from the pixels in the selected zone of the video images;
further comprising, between steps (a) and (b), designating a target of constant size and position in the image of the scene viewed by the fixed camera; and
processing the signal delivered by the camera by inlaying a stored pattern into said image in place of the target. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of displaying a selected zone of successive images belonging to a sequence of video images, each of said video images in the form of a matrix of pixels, on a TV set controlled by a subscriber and provided with a return channel toward a distribution network head, comprising the steps of:
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(a) providing a signal originating from at least one fixed large-field camera having a resolution that is greater than that of said TV set and representing said video images;
(b) designating at will from the TV set a determined portion of the video images and sending an identification of the determined portion to the network head via said return channel;
(c) sending only that portion of the signal which represents said determined portion from the network head to the TV set;
(d) from the TV set, selecting at will a zone having a format corresponding to that of the TV set in said determined portion under control of the subscriber; and
(e) generating pixels of a modified image having a size and the definition of the TV set by warping the selected zone.
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9. A device for causing display of a selected zone of successive images belonging to a sequence of video images represented by a signal originating from at least one fixed large-field camera having a resolution that is greater than that of units for displaying said display;
- means for enabling an operator to dynamically select a zone having a format corresponding to that of the display units in said video images;
means for generating pixels of modified images having a size and definition of the display units by interpolation from the pixels in the selected zone of the video image;
means for broadcasting a signal representing the modified image toward the display units;
means for enabling said operator to select a fixed target of constant size, once for all, in a scene as viewed by the camera; and
means for inlaying a representation of a stored pattern warped to match said target in place of the target prior to broadcasting.
- means for enabling an operator to dynamically select a zone having a format corresponding to that of the display units in said video images;
Specification