US Patent No: 5,223,932
Number of patents in Portfolio can not be more than 2000
Dynamic offset to increase the range of digitization of video images
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Jun 29, 1993
Issued date -
Jan 10, 1991
filing date -
07/639,794
serial no -
Expired
status
Importance
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Abstract
The assembly (10) utilizes real-time imaging for detecting radiation from an object field (12) which has a component which is periodic in time. A video camera (14) detects emitted and reflected radiation from the object field (12) and produces a video signal comprising a series of pixels representing a frame of the image. A dynamically averaged offset derived from the original video signal is subtracted from the video signal leaving only information from the time-varying component of the video object field. The resulting signal is digitized by a digitizer (18) contained in a processor (16). The processor (16) averages the successive frames as synchronous images based on the periodicity of the object field (12) to eliminate unsynchronous noise from the image and to display an image synchronous with the periodicity of the object field (12). Because the final video image is a digitization of the amplified difference, the dynamic range of the corrected image is greatly increased.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,047,846 Image processing equipment with light source synchronized to blanking interval of video camera | 3 | 1990 | |
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| 4,399,464 Signal processor for an array of CID radiation detector elements | 38 | 1981 | |
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| 4,879,598 Infrared video camera shading correction device | 11 | 1988 | |
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| 4,672,439 FLIR imager with hybrid optical/electronic processor | 22 | 1985 | |
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| 4,409,615 Video imaging with automatically controlled radiation source | 8 | 1980 | |
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| 4,878,116 Vector lock-in imaging system | 25 | 1988 | |