1. Method for reducing noise in image data,
comprising the steps of
performing a spatial noise reduction on the image data and
applying a gamma correction on the spatial noise reduced image data.
2. Method according to claim 1,
further comprising the steps of
performing a transformation step on the image data before performing the spatial noise reduction for transforming the type of noise comprised in the image data and performing an inverse transformation step on the spatial noise reduced image data before applying gamma correction.
3. Method according to claim 2,
wherein said transformation step comprises performing an Anscombe transformation for transforming the noise comprised in the image data into Gaussian noise and said inverse transformation step comprises performing inverse Anscombe transformation.
4. Method according to claim 3,
wherein for said Anscombe transformation and said inverse Anscombe transformation a simplified transformation is used enabling transformation of Poisson noise into Gaussian noise.
5. Method according to claim 3,
wherein for said Anscombe transformation and said inverse Anscombe transformation a general transformation is used enabling transformation of a mixture of Poisson and Gaussian noise into Gaussian noise.
6. Method according to claim 2,
further comprising the step of
detecting the present luminance conditions.
7. Method according to claim 6,
comprising the steps of deciding based on the detected luminance conditions whether to perform a transformation and corresponding inverse transformation on the image data.
8. Method according to claim 7,
comprising the steps of deciding based on the detected luminance conditions whether to use a general or a simplified transformation and corresponding inverse transformation.
9. Computer program product for performing the steps of the method according to any of claims 1 to 8 when executed by a computer.
10. System for noise reduction in image data
comprising
a processing unit,
said processing unit comprising
a spatial noise reduction component for performing a spatial noise reduction on the image data and
a gamma correction component for applying a gamma correction on the spatial noise reduced image data.
11. System according to claim 10,
wherein said processing unit further comprises
a transformation component for performing a transformation step on the image data before performing the spatial noise reduction for transforming the type of noise comprised in the image data and
an inverse transformation component performing an inverse transformation step on the spatial noise reduced image data before applying gamma correction.
12. System according to claim 11,
further comprising a detection unit for detecting the present luminance conditions.
13. System according to claim 12,
wherein said processing unit decides depending on the luminance conditions detected by the detection unit whether to perform a transformation and corresponding inverse transformation on the image data.
14. System according to claim 13,
wherein the processing unit decides depending on the luminance conditions detected by the detection unit whether to perform a general or simplified transformation and corresponding inverse transformation on the image data.
15. Imaging device, preferably a camera, comprising a system for noise reduction according to any of claims 10 to 14.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An external defibrillator with a defibrillation energy delivery circuit comprising:
a delivery mode input; and
a mode switch for selectively adding impedance to said energy delivery circuit to compensate for shunt current, the mode switch position based on said delivery mode input.
2. The defibrillator of claim 1 wherein said delivery mode input comprises a parameter indicating the type of an electrode coupled to the defibrillator.
3. The defibrillator of claim 2, wherein said electrode type parameter is selected from the group consisting of adult, pediatric, or internal electrodes.
4. The defibrillator of claim 2, wherein said delivery mode input further comprises a parameter indicating the position of a pair of said electrodes on a patient.
5. The defibrillator of claim 4, wherein said electrode pair position parameter is selected from the group consisting of anterior-anterior, anterior-posterior, and internal positions.
6. The defibrillator of claim 1, wherein said mode switch further comprises a plurality of switches arranged in parallel, the positions of said plurality of switches based on said delivery mode input.
7. The defibrillator of claim 1, further comprising:
an energy source; and
a voltage charger to charge the energy source to a voltage based on the delivery mode input.
8. The defibrillator of claim 1, wherein the position of said mode switch is further based on a parameter indicating the success of a previous defibrillation shock.
9. The defibrillator of claim 1, wherein the position of said mode switch is further based on a measure of patient impedance.
10. A method for compensating defibrillation current for cardiac shunt currents, comprising the steps of:
detecting the mode of delivery of the defibrillation current; and
selectively adding impedance in series with the defibrillation current based on said detecting step.
11. The method of claim 10, wherein said detecting step comprises detecting the type of an electrode which is coupled to the defibrillator.
12. The method of claim 11, wherein said electrode type is selected from the group consisting of adult, pediatric, and internal electrodes.
13. The method of claim 11, wherein said detecting step further comprises detecting a parameter indicating the position of a pair of said electrodes on a patient.
14. The method of claim 13, wherein said electrode pair position parameter is selected from the group consisting of anterior-anterior, anterior-posterior, and internal positions.
15. The method of claim 10, wherein said step of selectively adding impedance further comprises positioning a plurality of switches arranged in parallel based on said detecting step.
16. The method of claim 10, further comprising the step of charging a defibrillation energy source to a voltage based on said detecting step.
17. The method of claim 10, wherein the step of selectively adding impedance is further based on detecting a parameter indicating the success of a previous defibrillation shock.
18. The method of claim 10, wherein the step of selectively adding impedance is further based on a step of measuring patient impedance.
19. An apparatus for delivering electrotherapy in one of a plurality of delivery modes, comprising:
a mode selector; and
an electrotherapy delivery circuit, responsive to the mode selector, which is selectively configured as one of a voltage source or a modified current source, depending upon the delivery mode.
20. A method for delivering electrotherapy in one of a plurality of delivery modes, comprising the step of:
setting a delivery mode; and
selectively configuring an electrotherapy delivery circuit as one of a voltage source or a modified current source as a function of said delivery mode.