Patent ID: 11880978
Assignee: SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. A system, comprising:
at least one processor, and
a storage device for storing instructions that, when executed by the at least one processor, cause the system to effectuate operations comprising:
acquiring a target image including a plurality of elements corresponding to a plurality of pixels or voxels, wherein the target image is generated by an imaging device and includes a first region and a second region, a first set of the plurality of elements are included in the first region, and a second set of the plurality of elements are included in the second region;
determining, based on the first set of the plurality of elements included in the first region and the second set of the plurality of elements included in the second region, a characteristic curve corresponding to the target image, wherein
the characteristic curve illustrates a relationship between a distance and a gray level corresponding to the distance,
the distance indicates a reference distance between each of the first set of the plurality of elements and a corresponding element in the second set of the plurality of elements, and
the gray level indicates an average gray level of one or more elements in the first set of the plurality of elements associated with the same reference distance;

determining, based on the characteristic curve, a transformation curve, the transformation curve illustrating a relationship between gray levels of the plurality of elements before transformation and gray levels of the plurality of elements after transformation; and

determining, based on the transformation curve, an updated target image;
wherein the transformation curve is determined by:
determining, based on the characteristic curve, N characteristic curve segments;
determining, based on the N characteristic curve segments, N transformation curve segments; and
generating the transformation curve based on the N transformation curve segments; and

wherein the N transformation curve segments is determined by:
for an xth transformation curve segment of the N transformation curve segments,
calculating a slope of the xth transformation curve segment based on a pray level of a predetermined point in the characteristic curve, a gray level of a starting point of an xth characteristic curve segment, and a gray level of an end point of the xth characteristic curve segment, the xth characteristic curve segment corresponding to the xth transformation curve segment, wherein x is an integer, 1≤x≤N;
determining the gray level of a starting point of the xth transformation curve segment; and
determining the xth transformation curve segment based on the slope of the xth transformation curve segment and the gray level of the starting point of the xth transformation curve segment.