Title:
【発明の名称】合成画像を形成する方法及び装置
Document Type and Number:
Japanese Patent JP2581815
Kind Code:
B2
Abstract:
Methods and apparatus are disclosed for rapid and interactive "warping" of a first image made up of pixels to form a resulting image made up of pixels which are aligned, pixel-for-pixel, with a second image made up of pixels. The images may be stroboscopic voltage contrast images representing operating states of two integrated circuit devices -- a failing device and a fully functional device. The aligned images permit an engineer who may have little knowledge of the device to diagnose dynamic failures of the failing device by comparing the aligned images to produce an image showing the differences. The invention is preferably carried out as a series of processing steps on a standard, general purpose engineering workstation. In accordance with the invention, two images are displayed on a screen. The locations of three features of the first image are selected and marked (with sub-pixel precision) for alignment respectively with the locations of three selected features of the second image. A geometric planar transformation matrix is calculated which maps the features of the first image into those of the second image. The values in the transformation matrix are then converted into fixed point representations which are used, as the resultant image is scanned line, to transform positions of the first image into pixel positions of the resultant image. Pixels outside the display field of the resultant image are assigned a black intensity value. Since pixel positions of the resultant image may not coincide with pixel positions of the first image, the intensity value of each pixel of the resultant image is extrapolated (using weighted averaging based on distance) from the values of the four pixels of the first image surrounding the location of the first image which corresponds to the pixel of the resultant image. The resultant image may be compared, pixel-for-pixel, with the second image to show differences between the images.
Inventors:
ZABIA EI FURINOWA
SUTEFUANO II KONSHIINA
SUTEFUANO II KONSHIINA
Application Number:
JP30348689A
Publication Date:
February 12, 1997
Filing Date:
November 24, 1989
Export Citation:
Assignee:
SCHLUMBERGER TECHNOLOGIES INC
International Classes:
G01R31/28; G01R31/302; G06T1/00; G06T3/00; G06T5/00; G01R31/26; H01L21/66; H04N7/18; H05K13/08; (IPC1-7): G01R31/302; G06T1/00; G06T7/00; H01L21/66; H04N7/18
Attorney, Agent or Firm:
Kazuo Kobashi (1 person outside)