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US 6,584,238 B1Granted
Dynamic range modification
AssigneeKoninklijke Philips Electronics N.V.
InventorsPieter B. Dielhof, Ralph M. W. Van Der Heijden
Life of this patent
Estimating the term…
Abstract
In a dynamic range modification (DRCS), a brightness component (B) is selected (LPF) from a sensor output signal (SS), the brightness component (B) is non-linearly processed (NLP) to provide a non-linearly processed brightness signal (B′), and a modified signal (CS) is furnished (GC2) in dependence upon the non-linearly processed brightness signal (B′).
Claims32
A dynamic range modification circuit comprising:
- an input for an analog sensor signal containing analog brightness and analog color components;
- analog means for providing the analog brightness component from the analog sensor signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component.
2 more elements
A color camera, comprising:
- a sensor for generating an analog sensor signal containing analog brightness and analog color components;
- analog means for providing the analog brightness component from the analog sensor signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component;
- and
- means for further processing the modified signal.
3 more elements
A dynamic range modification method comprising the steps of:
- providing an analog sensor signal containing analog brightness and analog color components;
- analog processing to provide the analog brightness component from the analog sensor signal;
- non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- furnishing a modified signal depending on the non-linearly processed brightness signal.
2 more elements
The method 11, wherein:
- the brightness component is provided from the sensor signal through a high pass frequency filter;
- the color component is provided from the sensor signal through a low pass frequency filter;
- and
- the method further comprises the steps of:
- digitizing the modified signal to obtain digital signals;
- and
- processing the digital signals.
4 more elements
A dynamic range modification circuit comprising:
- an input for an analog sensor signal containing analog brightness and analog color components;
- a filter to provide the analog brightness component from the analog sensor signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component.
2 more elements
A color camera, comprising:
- a sensor for generating an analog sensor signal containing analog brightness and analog color components;
- a filter for providing the analog brightness component from the analog sensor signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component;
- and
- means for further processing the modified signal.
4 more elements
A dynamic range modification method comprising the steps of:
- providing an analog sensor signal containing analog brightness and analog color components;
- filtering to provide the analog brightness component from the analog sensor signal;
- non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- furnishing a modified signal depending on the non-linearly processed brightness signal.
2 more elements
A dynamic range modification circuit comprising:
- an input for a sensor output signal containing analog brightness and color components;
- means for providing the analog brightness component from the sensor signal;
- means for non-linearly processing the brightness component to provide an analog non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component;
- and wherein the output means include:
- means for generating a gain control signal depending on the non-linearly processed brightness signal;
- and
- means for multiplying the sensor signal by the gain control signal to obtain a modified signal.
6 more elements
A dynamic range modification circuit comprising:
- an input for a sensor output signal containing analog brightness and color components;
- means for providing the analog brightness component from the sensor signal;
- means for non-linearly processing the brightness component to provide an analog non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the analog color component;
- and wherein the output means include:
- means for generating a gain control signal from the non-linearly processed brightness signal;
- means for providing the color component from the sensor output signal;
- means for multiplying the color component by the gain control signal to obtain a gain-adjusted color component;
- and
- means for summing the non-linearly processed brightness signal and the gain adjusted color component to obtain the modified signal.
8 more elements
A color camera, comprising:
- a sensor for generating a sensor output signal containing analog brightness and color components;
- means for providing the analog brightness component from the sensor signal;
- means for non-linearly processing the brightness component to provide an analog non-linearly processed brightness signal;
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the color component;
- and
- means for further processing the modified signal;
- and wherein the brightness component is isolated from the sensor signal using a high pass frequency filter.
4 more elements
A color camera, comprising:
- a sensor for generating a sensor output signal containing analog brightness and color components;
- means for providing the analog brightness component from the sensor signal;
- means for non-linearly processing the brightness component to provide an analog non-linearly processed brightness signal;
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal and the color component;
- and
- means for further processing the modified signal;
- and wherein the output means include:
- means for generating a gain control signal from the non-linearly processed brightness signal;
- means for providing the color component from the sensor output signal;
- means for multiplying the color component by the gain control signal to obtain a gain-adjusted color component;
- and
- means for summing the non-linearly processed brightness signal and the gain adjusted color component to obtain the modified signal;
- and wherein the color component is provided from the sensor signal using a low pass frequency filter.
10 more elements
A dynamic range modification circuit comprising:
- means for providing a brightness component from a sensor output signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal, including:
- means for generating a gain control signal depending on the non-linearly processed brightness signal;
- and
- means for multiplying the sensor signal by the gain control signal to obtain the modified signal;
- and in which the brightness component is provided from the sensor signal using a high pass frequency filter.
5 more elements
A dynamic range modification circuit comprising:
- means for providing a brightness component from a sensor output signal;
- means for non-linearly processing the brightness component to provide a non-linearly processed brightness signal;
- and
- output means for furnishing a modified signal depending on the non-linearly processed brightness signal, including:
- means for generating a gain control signal from the non-linearly processed brightness signal;
- means for selecting a color component from the sensor output signal;
- means for multiplying the color component by the gain control signal to obtain a gain-adjusted color component;
- and
- means for summing the non-linearly processed brightness signal and the gain adjusted color component to obtain the modified signal;
- and in which:
- the brightness component is provided from the sensor signal using a high pass frequency filter;
- the color component is provided from the sensor signal using a low pass frequency filter.
9 more elements
Dependencies are inferred from the claim text.