Real-time image contrast and edge sharpness enhancing apparatus
阅读：535发布：2022-01-13
专利汇可以提供Real-time image contrast and edge sharpness enhancing apparatus专利检索，专利查询，专利分析的服务。并且Apparatus for enhancing contrast and edge sharpness of images visually displayed by a line scan imaging and display system wherein an electrical analog output signal of a line scan imaging system which may be degraded is processed in real time by enhancing circuitry producing corrective signals of adjustable magnitude for addition to the degraded signal to provide an enhanced brightness intensity modulating signal for a video display. The enhancing circuitry includes differentiating circuitry for obtaining the first and second derivatives of the degraded signal in turn applied to enhancer circuitry for causing the polarity of the first derivative to be always opposite to that of the second derivative so that the relative amplitudes of higher frequencies are emphasized. The polarity adjusted first derivative is added to the degraded signal to make the displayed image more crisp by reason of enhanced edge sharpness. A second polarity adjusted signal is developed by causing the polarity of the degraded signal to follow that of the first derivative. An integration of the second polarity adjusted signal wherein the relative amplitude of low frequencies are emphasized is added to the degraded signal to enable a visual display of greater contrast.，下面是Real-time image contrast and edge sharpness enhancing apparatus专利的具体信息内容。
1. Apparatus for processing an electrical input signal to provide a vidEo signal comprising: differentiating means adapted to receive the input signal for providing signals indicative of the nth and the (n+k)th derivatives of the input signal wherein n is any integer including zero and k is any integer greater than zero; signal polarity adjusting means connected to said differentiating means to receive said nth and (n+k)th derivative signal for switching the polarity of said nth derivative signal to always bear an opposite polarity relative to the polarity of said (n+k)th derivative signal and for providing an output signal linearly indicative of said nth derivative signal switched in polarity opposite to the polarity of the (n+k)th derivative signal; and signal summing means adapted to receive the input signal and connected to said polarity adjusting means for adding the input and adjusting means output signals to provide the video signal.
2. Apparatus according to claim 1 further comprising: integrator means electrically interposed between said polarity adjusting means and said signal-combining means for integrating said polarity adjusted output signal of said polarity adjusting means.
3. Apparatus according to claim 2 further comprising: bias adjuster means connected to receive said nth derivative of the input signal for adjusting its polarity reference level to a level between the maximum and minimum intensities of the input signal and providing an output signal indicative of said adjusted nth derivative to said polarity adjusting means.
4. Apparatus according to claim 1 wherein said signal polarity adjusting means comprises: first polarity detector means for providing a detector output signal indicative that the polarities of said derivatives of said input signal measured relative to respective reference levels have a predetermined relative sense; and first polarity reversing means normally providing as an output signal said nth derivative of the input signal and responsive to said detector output signal for providing as said output signal said nth derivative signal having a reversed polarity.
5. Apparatus according to claim 4 further comprising: said first detector means providing said output signal indicative that said nth and (n+k) th derivatives have opposite polarity.
6. Apparatus according to claim 4 further comprising: said first detector means providing said output signal indicative that said nth said (n-k)th derivatives have the same polarity.
7. Apparatus according to claim 4 further comprising: said means providing said derivative indicating signals including first and second differentiating means serially connected for providing signals indicative of respectively the first and the second derivatives of the input signal; said first detector means providing said detector output signal indicative that said first and second derivatives have the same polarity; and said first polarity reversing means providing said first derivative signal as polarity adjusted in response to said first detector output signal.
8. Apparatus according to claim 7 further comprising: variable means for adjusting the magnitude of electrical signals applied thereto and electrically interposed between said first polarity reversing means and said signal-combining means.
9. Apparatus according to claim 4 further comprising: said means providing said derivative indicating signals providing the zero derivative of the input signal and including first differentiating means for providing the first-derivative of the input signal; said first detector means providing said detector output signal indicative that said zero and said first-derivative signals have opposite polarities; said first polarity reversing means providing said zero-derivative signal as polarity adjusted in response to said first detector output signaL; and integrator means electrically interposed between said polarity-reversing means and said signal combining means for integrating said polarity-adjusted zero-derivative signal.
10. Apparatus according to claim 9 further comprising: variable means for adjusting the magnitude of electrical signals applied thereto and electrically interposed between said integrator means and said signal-combining means.
11. Apparatus according to claim 9 further comprising; said means providing said derivative-indicating signals further including second differentiating means for providing the second derivative of the input signal; second polarity detector means connected for receiving said first and second-derivative signals for providing a second detector output signal indicative that said first and second derivatives have the same polarity; and second polarity-reversing means providing to said signal-combining means said first derivative signal as polarity adjusted in response to said second detector output signal.
12. Apparatus according to claim 11 further comprising: first, second, third, and fourth variable means for adjusting the magnitude of electrical signals and being respectively electrically connected for receiving and adjusting the input signal, for receiving and adjusting the output signal of said integrator means, for receiving and adjusting the output signal of said second polarity-reversing means and for receiving and adjusting said output signal of said signal-combining means to provide the video output signal.
13. Apparatus according to claim 12 further comprising: variable bias adjuster means connected to receive the input signal for adjusting its polarity reference level to a level between the maximum and minimum intensities of the input signal and providing an output signal indicative of said adjusted zero derivative to said first detector means and to said first polarity-reversing means.
14. Apparatus for processing an electrical input signal to provide a video output signal comprising: differentiating means adapted to receive the input signal for providing signals indicative of the first and the second derivatives of the input signal; signal polarity-adjusting means connected to said differentiating means to receive said first and second derivative signal for switching the polarity of said first derivative signal to always bear an opposite polarity relative to the polarity of said second derivative signal and for providing a first corrective signal linearly indicative of said first-derivative signal switched in polarity opposite to the polarity of the second derivative signal; integrating means adapted to be connected to receive the input signal for providing a second corrective signal indicative of the integration of a polarity adjustment of the input signal which adjustment has a polarity the same as that of the first derivative of the input signal; and signal- summing means connected to said signal polarity adjusting and integrating means for receiving and adding said first and second corrective signals with the input signal to provide the video output signal.
15. Apparatus according to claim 14 further comprising: said signal polarity-adjusting and integrating means each including variable means electrically interposed for adjusting the relative magnitude of the respective one of said first and second corrective signals.
16. Apparatus according to claim 15 wherein said integrating means includes: variable bias-adjuster means connected to receive the input signal for adjusting its polarity reference level and providing an output signal; adjustment means receiving said bias-adjuster output signal for providing said polarity adjustment having a polarity the same as that of said bias-adjuster output signal; and integrator means for receiving and integrating said polarity adjustment to provide said second corrective signal.
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