Showing papers on "Standard test image published in 1981"

Automated radiographic inspection system

Abstract: In an automated real-time radiographic inspection system for detecting flaws, defects or inhomogeneities in manufactured objects, the objects (10, 11, 12, . . . ) to be tested are moved on a conveyor (20) in succession past an X-ray source (30). Penetrating X-ray radiation is transmitted through the objects (10, 11, 12, . . . ) to cause an image to be formed for each object in succession by an electronic imaging system (40). The imaging system (40) generates digital signals representative of the image for each object, and transmits the digital signals to a data processor/comparator (50). One of the objects (10, 11, 12, . . . ) may be considered as a reference object against which the other objects are compared for structural homogeneity. Thus, the electronic images of the objects (11, 12, . . . ) could be compared with the electronic image of, for example, the object (10). Alternatively, the electronic images of the test objects could be compared with an electronic reference image programmed into the data processor/comparator (50), the programmed reference image. The comparison performed by the data processor/comparator (50) is a subtraction process, which eliminates background features common to test and reference images. Thus, any flaw appearing in a test image, but not present in the reference image, stands out in sharp detail. When a flaw occurs in a test image, the subtractive process results in a non-null signal, which activates a conveyor control mechanism (70) for stopping the conveyor (20) so as to enable rejection of the flawed test object.

Attenuator for providing a test image from a radiation source

Abstract: A nuclear radiation attenuator for providing a test image from a source of radiation is disclosed. The attenuator provides a test image including a plurality of discrete target images located in a background image. Each target image has an intensity that differs from the intensity background image to provide a target to background contrast ratio for each target image. A plurality of the target images each have a different contrast ratio so that the contrast ratios of the target simulate contrast ratios found in clinical testing. The attenuator provides a standardized test image that enables the performance of a scintillation camera to be tested routinely.

Digital Image Processing Systems

Abstract: Universal digital image processing systems in europe - A comparative survey.- Cello an interactive system for image analysis.- A knowledge-based interactive robot-vision system.- Real-time processing of binary images for industrial applications.- CPO-2/K-202: A universal digital image analysis system.- The gop parallel image processor.- Object detection in infrared images.

Test image projector for testing imaging devices

Abstract: A test image projector operating in the ultraviolet through infrared specm that is comprised of two symmetrically mounted identical mirrors which are off-axis sections of an astronomical quality parabola. The first mirror produces collimated beams from object points and reflects these collimated beams onto the second mirror while the second mirror refocuses the collimated beams into diffraction limited image points, and thus provides a diffraction limited test image. The test image is used to check the quality of optical and electrooptical systems.