Method and apparatus for improving brightness uniformity in an image
AssigneeSiemens Aktiengesellschaft
InventorsHua Bin Zhu, Jian Min Wang, Cai Xia Fu, Yan Hong Chen
Life of this patent
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Abstract
In a method and apparatus for improving the brightness uniformity in an image, signals are acquired using a radio frequency receiving coil, and noise in the acquired signals is normalized so as to produce an image, then the brightness of various pixels in the image is determined according to the sensitivity of the radio frequency receiving coil. The brightness of the image is then made uniform by compensating the brightness of the various pixels in the image.
Claims12
A method for improving the brightness uniformity in an image, comprising the steps of:
- acquiring signals by using a radio frequency receiving coil, and normalizing the noises of the acquired signals so as to produce the image;
- determining the brightness of each pixel in the image according to the sensitivity of the radio frequency receiving coil by obtaining a sensitivity curve of the radio frequency receiving coil by taking a measurement in advance thereto, and using said sensitivity curve as the image's brightness curve;
- and wherein compensating the brightness of each pixel of the image to make the brightness of the image uniform comprises compensating the brightness of each pixel of said image according to said brightness curve, so as to make the compensated brightness curve into an approximately horizontal straight line;
- and
- compensating the brightness of the each pixel of the image to make the brightness of the image uniform by determining a curve whose degree of fitting with said brightness curve reaches a predetermined threshold, and dividing the brightness of each pixel in the image by the value of the curve at the position corresponding to that of the pixel.
An apparatus for improving the brightness uniformity in an image, comprising:
- an image processing module that acquires signals by using a radio frequency receiving coil and for normalizing the noises of the acquired signals to produce the image;
- a measuring module configured to determine the brightness of each pixel of the image according to the sensitivity of the radio frequency receiving coil by measuring the sensitivity of said radio frequency receiving coil and taking the obtained sensitivity curve of the radio frequency receiving coil as the brightness curve of the image;
- a brightness compensating module is configured to compensate the brightness of each pixel in the image, so as to make the brightness of the image uniform by compensating the brightness of each pixel of the image according to said brightness curve, to make the compensated brightness curve into an approximately horizontal straight line;
- a fitting module configured to fit the brightness curve obtained by the measuring module to obtain a curve whose degree of fitting with said brightness curve reaches a predetermined threshold;
- and
- said brightness compensating module being configured to divide the brightness of each pixel of the image by the value of the curve at the position corresponding to that of the pixel.
Dependencies are inferred from the claim text.