DE1001825B - Device for determining the right-angled coordinates of individual measurement points in measurement images, preferably recorded cinematographically - Google Patents

Description

The invention relates to a device for determining the right-angled coordinates of individual measurement points in measurement images, preferably recorded cinematographically. It is a known fact that the exploitation of motion picture films, i. That is, the determination of the position of the image measuring point on each individual film image, including its X and F coordinates, takes a considerable amount of time. So far, the evaluation has generally been carried out by means of a measuring microscope with a cross slide. In order to free oneself from tiring microscopic work, it has also been proposed, on the other hand, to project the film image to be measured enlarged and to carry out the measurement on this projected image. Here, too, a tracking device to be adjusted ^{by hand 1, e.g.} B. with a cross slide guide, with the help of which the pixel to be measured is continuously tracked by means of a measurement mark.

These and similar suggestions still have the disadvantage that the evaluation does not take place automatically. In any case, the mark controlled by the cross slide or the like must be set by the hand of an operator to the pixel to be measured. In addition, it is often desirable that the X and F coordinates of the measuring point occur directly as electrical values, for example in order to feed these components to an electrical computing device. For such purposes, the known arrangements would first have to be additionally equipped with appropriate transducers.

The invention takes a fundamentally different approach to the known method in many respects is superior. In the new device according to the invention, the measurement image or its projection image within a rectangularly delimited area by a scanning device known per se scanned point by point according to the line raster verfaliren and the path of the scanning beam from the starting point the scanning to the measuring point or measured from the measuring point to the end point of the scanning, the The number of completely traversed lines is a measure of the one coordinate and the remaining excess represents a measure for the other coordinate with respect to the start or end point of the scan.

The invention is based on the knowledge that with the line raster scanning devices known from television technology By dividing the image field into lines and dots, the image is automatically resolved in terms of coordinates can be achieved, provided that only the measuring point in the film image provides an image signal that is clearly different from the Distinguishes image signals that originate from the rest of the image content. This will in most cases Device for determination

of rectangular coordinates

individual measuring points in preferably

cinematographically recorded

Measurement images

Applicant:

Askania -Werke Aktiengesellschaft,
Berlin-Friedenau, Bundesallee 86-89

Dr. Ernst Brackertz, Berlin-Steglitz,

and Dipl.-Ing. Heinz Umlauft, Berlin-Südende,

have been named as inventors

apply or can be achieved from the outset by taking appropriate measures when taking the measurement images be.

As a scanning device you can, for. B. use a Braun tube whose light spot is known Way, a line grid writes. The scanning of the measurement images can, for example, also by means of a known image decomposition tube, preferably one with a storage effect (supericonoscope), onto whose photosensitive layer the film image is projected. The latter scanner is can also be used if you have to evaluate non-transparent recording media. Different of the use of these known scanning devices for television purposes is known from the interlacing method customary there not used in the present case. Rather, the arrangement is made in such a way that that the resolution of the grid is the same in both coordinate directions, d. H. the line spacing corresponds to the distance between the individual pixels on the line.

The determination of the path covered by the scanning beam can be determined by measuring the time between the start of scanning and the image signal given by the image measuring point. One can for example proceed so that the scanning beam between the start of scanning and the reaching of the measuring point causes the charging of a capacitor, the one that has been covered Scanning path proportional final voltage is measured. Since the one corresponding to the scanning of a line Capacitor charging is known to result

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the X- and F-coordinates from the capacitor voltage easily. But you can also count the number of tilting processes from the start of scanning until the scanning beam hits the measuring point and measure the remainder of the line as the charging voltage on a capacitor. The number of tipping processes directly results in the F-coordinate, the charging voltage on the capacitor directly results in the X-coordinate of the measuring point. The form in which the electrical coordinate values of the measuring point are used (reading, recording, entering into a computing device) is of subordinate importance for the general idea of the invention.

The advantages of the new evaluation method are obvious: It works completely automatically; the evaluation speed can be driven very high; the searched coordinates of the image measuring point fall in electrical quantities.

While maintaining some of these advantages, the new process can also be used when the film frames apart from the measuring point, it contains other image parts which are undesirable with regard to the determination of the coordinates. In this case one must take appropriate precautions before the scanning process to ensure that that the image measuring point provides image signals that clearly differ from the image signals that of originate from the rest of the image. There are various possibilities. For example, you can click mark the image measuring points on the film by making grooves. But you can also scan from provide projected film images and in this projection z. B. with the help of tracked aperture cutouts ensure that only the measuring point of the entire other dimmed image content appears the projection surface arrives.

Regarding the state of the art, reference should also be made to the fact that it is known to measure areas to use a line raster scanning these. This is done, for example, during the ongoing measurement irregular leather areas, where the number of grid points lying within the area to be measured it is determined which is a measure of the path that the scanning beam takes within the boundary covered the area to be measured. In order to achieve the rasterization, appropriate X-rayed rows of holes equipped plates, drums or the like. Used with photocells and Counting devices work together.

The invention is explained using an example on the basis of the schematic drawing.

The image strip 1 to be measured, indicated only by its image fields, with the measuring point 25 and the starting point 5, is arranged between the Braun tube 2, which writes a line raster, and the photocell 3. If the scanning beam 4 hits the starting point 5, the amplifier 6 with the voltage supply 7 sends an electrical pulse to the relay R ₁ and the magnetic coil 9. Via the ratchet wheel 10, the shift drum 11 is guided onto a conductive lamella which is connected to the slip ring 12. The pulse also ensures that the contact r _{x is} briefly closed via the relay R ₁ and the relay R ₂ responds. The relay R ₂ closes the contact r ₂₁ and holds itself, since contact r _t opens again after the end of the pulse. To ensure this process is secure, relay ^ _{1 may} only drop out when relay R _{2 has} responded. At the same time as contact r ₂₁ , contact r ₂₂ belonging to relay R ₁ also closes. The scanning beam 4 is now deflected horizontally by connecting the battery 17 at a speed which is determined by the resistor 18 and the capacitor 19. If the beam has received the desired horizontal deflection (end of line), the capacitor 19 is discharged via the tilting device 20. From the tilting device 20 with the voltage supply 21, the potentiometer 23, which is supplied from the voltage source 24, is rotated further during the unloading process via the holding device and a latch circuit (not shown). As a result, the scanning beam is deflected vertically and now scans a new and further line until a new pulse is given to the device 9 through the measuring point 25. Now the contact ring 11 is switched to an insulating lamella by the ratchet wheel, whereby the relay R ₂ drops out and the contacts r ₂₁ and r _{22 are} opened. At this moment the instrument shows the voltage that was reached from the beginning of the last line until the measuring point was reached. So it is a measure of the X coordinate. The instrument 27 displays a voltage value which is proportional to the number of lines. The F-coordinate is measured here accordingly.

The general idea of the invention is of course not based on the evaluation of kinematographic measurement Recordings limited. Use can also be made of the invention, for example, when it comes to evaluating. Single recordings. The recording medium can also and the visible measuring point recording can be of any other type.

Claims (9)

Patent claims: 1. Device for determining the rectangular coordinates of individual measuring points in, preferably cinematographically recorded measurement images, characterized in that the measurement image or its projection image within a rectangular area delimited by a per se known scanning device scanned point by point according to the line raster method and the path of the Scanning beam from the starting point of the scanning to the measuring point or from the measuring point to the The end point of the scan is measured, with the number of completely traversed lines Measure for one coordinate and the remaining excess a measure for the other coordinate in with respect to the start or end point of the scan. 2. Apparatus according to claim 1, characterized in that the scanning of the measurement image by means of a light spot that is generated by a Braun tube and writes a line raster he follows. 3. Apparatus according to claim 1, characterized in that the scanning of the measurement image by an image decomposition tube, preferably with a memory effect, e.g. B. Supericonoskop, takes place, on whose photosensitive layer the measurement image is projected. 4. Apparatus according to claim 1, characterized in that that the determination of the path covered by the scanning beam by a time measurement he follows. 5. Apparatus according to claim 1, characterized in that the resolving power of the Grid is the same size in both coordinate directions (line spacing equals point spacing of the line). 6. Apparatus according to claim 4, characterized in that the scanning beam between the Sampling start and the reaching of the measuring point causes the charging of a capacitor, its The final voltage proportional to the covered scanning path is measured. 7. Apparatus according to claim 1, characterized in that the number of tilting processes is counted until the scanning beam hits the measuring point and the remainder of the line is counted as Charging voltage is measured on a capacitor. 8. Apparatus according to claim 1 for evaluating measuring films, the film images of which apart from the measuring point have further parts of the picture, thereby indicates that before the scanning of the measuring image the measuring point with regard to its effected Image signal is given a clear distinctive power compared to the rest of the image content. 9. Apparatus according to claim 8, in which a projected measurement image is scanned, characterized in that that the projection beam path z. B. with the help of a tracked the measuring point Aperture section is influenced so that only the measuring point is projected. Considered publications:
German Patent Nos. 632 955, 806 596, 755, 881 875. 1 sheet of drawings © 609 768/132 1.57