Showing papers on "Camera auto-calibration published in 1975"
Patent•
23 Apr 1975
TL;DR: In this paper, an information processing stage connected to the photodetector matrix for being processed in accordance with a preselected program is used. And the output unit controls the camera in dependence of the processed signals.
Abstract: In an arrangement for control of aerial cameras an objective for imaging a surveyed area onto a projection plane is employed. The image frequency and the drift are determined from the speed and the direction of the image motion on the projection plane, whereas the grey values are exploited for the exposure setting of the camera. The obtained parameters are used for controlling the camera. The projection plane is covered at least partially by one or more than one digital photo detector matrix. The signals produced are fed into an information processing stage connected to the photodetector matrix for being processed in accordance with a preselected program. An output unit controls the camera in dependence of the processed signals. The projection plane can be arranged in the image plane of the camera objective and can be employed to evaluate the entire photogram.
16 citations
NEC1
TL;DR: In this article, a new image device was designed to electronically separate two kinds of color components from an optical image utilizing photoelectric properties of the surface of a silicon-vidicon target, and an economical color-TV camera using this device was proposed.
Abstract: A new image device designed to electronically separate two kinds of color components from an optical image utilizing photoelectric properties of the surface of a silicon-vidicon target, and an economical color-TV camera using this device are proposed. This system requires neither special construction of a camera tube target to obtain index signals for color separation nor bias lighting. Crosstalk components present in the color signals from the color camera tube are corrected by circuitry. This color camera is about three times as high in sensitivity as that using an antimony trisulfide vidicon. It has many other features, including the capability of imaging a fixed object, without burn-in for a long time, as well as high reliability and long life.
3 citations
TL;DR: The Anger scintillation camera system is simulated on a computer making possible a study of its performance as regards coordinate distortion, intrinsic resolution and uniformity of the energy-defining pulse for optional values of the different parameters of importance in the construction of a camera.
2 citations
Patent•
16 Sep 1975
TL;DR: In this article, an apparatus is provided for taking close-up high magnification photographs of a subject with a camera having a variable aperture mechanism and an artificial light source, where the light source is positioned by index marks at different distances from the subject, these index marks representing changes in illumination equivalent to different camera aperture settings.
Abstract: An apparatus is provided for taking close-up high magnification photographs of a subject with a camera having a variable aperture mechanism and an artificial light source. The apparatus includes means in combination with the camera for securely positioning and aiming the artificial light source in relation to the distance between the photographic film in the camera and the subject to be photographed. Rather than changing the aperture setting of the camera when there are changes in the subject-to-film distance, the distance between the light source and the subject is changed. The light source is positioned by index marks at different distances from the subject, these index marks representing changes in illumination equivalent to different camera aperture settings.
1 citations