Adaptive background propagation method and device therefor
AssigneeTeradyne, Inc.
InventorRohit Patnaik
Life of this patent
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Abstract
In one implementation, a method for reducing reconstruction artifacts in a combined image constructed of a multiple images is provided. The method may include identifying pixels in images that are in a selected range. The identified pixels are replaced the with a substitute pixel value. The images with the substitute pixel values are combined to form a combined image having reduced reconstruction artifacts.
Claims40
A method for reducing reconstruction artifacts in a combined image constructed of a plurality of images, the method comprising:
- a) selecting a boundary pixel value of a selected range of pixel values, wherein selecting the boundary pixel value comprises selecting one of:
- (i) a mean pixel value of a first image;
- or (ii) a median pixel value of the first image;
- b) identifying pixels in each of the plurality of images, each of the identified pixels having a pixel value within the selected range, the plurality of images being for a region of interest acquired at different angles;
- c) replacing the identified pixels with a substitute pixel value;
- and
- d) combining the plurality of images comprising the substitute pixel value to form a combined image having reduced reconstruction artifacts.
A method for reducing reconstruction artifacts in a combined image constructed of a plurality of images, the method comprising:
- a) selecting a boundary pixel value of a selected range of pixel values, wherein selecting the boundary pixel value comprises:
- (i) generating a histogram of a first image;
- (ii) identifying a mode pixel value of the first image, wherein the mode pixel value is related to the intensity of a bare portion of a printed circuit board being imaged;
- (iii) using the mode pixel value to determine the boundary pixel value;
- b) identifying pixels in each of the plurality of images, each of the identified pixels having a pixel value within the selected range, the plurality of images being for a region of interest acquired at different angles;
- c) replacing the identified pixels with a substitute pixel value;
- and
- d) combining the plurality of images comprising the substitute pixel value to form a combined image having reduced reconstruction artifacts.
A method for reducing reconstruction artifacts in a combined image constructed of a plurality of images, the method comprising:
- a) generating a histogram of an image;
- b) selecting a pixel value representing a majority of pixels in the image;
- c) determining a substitute pixel value using the selected pixel value;
- d) identifying pixels in each of the plurality of images in a selected range;
- e) replacing the identified pixels with the substitute pixel value;
- and
- f) combining the plurality of images comprising the substitute pixel value to form the combined image having reduced reconstruction artifacts.
A method for reducing reconstruction artifacts in a slice constructed of a plurality of images, the method comprising:
- a) identifying a gray scale value representing a majority of pixels in each of the plurality of images;
- b) setting pixels having a gray scale value falling in a range that is one of:
- (1) above;
- or (2) below the identified gray scale value to the identified gray scale value in each of the plurality of images;
- and
- c) combining the plurality of images to form a tomosynthetic slice.
A printed circuit board inspection apparatus comprising:
- an imaging source configured to acquire a plurality of images of a printed circuit board;
- and
- an image processor configured to reduce reconstruction artifacts in a combined image constructed of the plurality of images, the image processor configured to:
- a) identify pixels meeting a selected criteria in each of the plurality of images, the plurality of images being for a region of interest acquired at different angles, the selected criteria relating to a mean pixel value or median pixel value of a first image of the plurality of images;
- b) replace the identified pixels with a substitute pixel value;
- and
- c) combine the plurality of images comprising the substitute pixel value to form a combined image having reduced reconstruction artifacts.
A printed circuit board inspection apparatus comprising:
- an imaging source configured to acquire a plurality of images of a printed circuit board;
- an image processor configured to reduce reconstruction artifacts in a combined image constructed of the plurality of images, the image processor configured to:
- a) identify a gray scale value representing a majority of pixels in each of the plurality of images;
- b) set pixels having a gray scale value falling in a range that is one of:
- (1) above;
- or (2) below the identified gray scale value to the identified gray scale value in each of the plurality of images;
- and
- c) combine the plurality of images to form a tomosynthetic combined image.
Dependencies are inferred from the claim text.