SU516066A1 - Image analyzer - Google Patents

Description

The image converter 4 has a nonlinear dependence of the luminance of the screen B on the irradiance of the corresponding point of the input window. As an image converter 4, an electron-optical converter with a non-linear dependence of the output luminance on the irradiance of the input window or other devices introducing non-linearity into the converted optical signals can be used.

The spatial integrator 5 integrates over the radiation area of the output screen of the image converter 4 and directs to the input window of the photodetector 6.

The image analyzer performs the calculation in two consecutive clocks. During the first clock cycle, the clock pulse generator 7 produces on the blocks 1 and 2 of the playback of the analyzed images control signals that set the irradiance of the input window of the image converter 4 so that significant portions of the image obtained in the input window, on which the light ones were applied, were subjected to significant nonlinear constraints elements at the same time both analyzed images. During the second clock cycle, the clock pulse generator 7 gives control blocks 1 and 2, which set the irradiance of the input window of the image converter 4 so that the image obtained at the input window is not subject to significant non-linear restrictions.

In addition, the clock pulse generator 7 provides control sigals to the image converter 4, which sets this mode of operation and the last, the brightness of which is the screen sections corresponding to the sections of the input window of the converter 4 images into which the light elements of one of the two analyzed images are projected and second clock turns out to be the same.

The output signal of the photodetector 6 is fed to the input of the memory unit 8 and to one of the inputs of the subtraction unit 9. The other input of the subtractor receives the signal received at the output of the memory block 8. The memory block, controlled by the generator of 7 clock pulses, in the first cycle captures the signal arriving at its input. In the second cycle, the output of the memory block 8 has a signal recorded in the first cycle. At the same time, the inputs of the subtraction unit 9 simultaneously receive signals corresponding to the output signals of the photodetector 6, obtained during the first and second cycles. The clock generator 7 activates the subtraction unit 9 only during the second cycle and turns it off for the first time.

Thus, the output signal of the image analyzer represents the sequence of pulses generated during the second cycles, the amplitude of the pulses proportional to the difference of the sigals of the photodetector 6, obtained during the first and second cycles.

The signal conversion in the image analyzer is illustrated by the graph shown in FIG. 2

The area 10 of the input window of the converter 4 images consists of an area of 14 plots on which the light elements of one of the analyzed images are not designed, the area of 15 plots on which the light elements of one of the two analyzed images are designed, and the area of 16 plots on which the light elements are designed at the same time both analyzed images.

In the first cycle, the irradiance of the input window of the converter 4 images in areas of wax, in area 15, corresponds to 17 on the graph, and in areas waxed in area 16, to mark 18. The mode of converter 4 in this cycle characterizes curve 19 (dependence of brightness In the glow of the screen from the light B of the input window). In this case, on the output screen, the converter 4 images of the brightness of the sections that are waxed into area 15 corresponds to 20, and the brightness of the sections included in the area of 16, to 21. The integral radiation flux coming in this cycle from the screen of the converter 4 images of the photodetector 6 , corresponds to the shaded area 22.

In the second cycle, the irradiance of the input window of the transducer 4 images in the areas included in the area 15 corresponds to 23, and in the areas included in the area. Span 16, - to mark 24. The mode of the 4 image converter in this step characterizes curve 25. In this case, the brightness of the sections covered in area 15 corresponds to 20, and the brightness of sections included in area 16 to 26 The integrated radiation flux coming in from the screen of the converter of the 4 images to the photodetector 6 corresponds to the shaded area 27.

The difference between the signals of the photodetector 6, formed during the first and second cycles, proportional to the difference of the shaded areas 22 and 27, is the output signal of the image analyzer. This difference is proportional to the product of the area 16, on which the bright areas of the two analyzed images were superimposed, on the difference between the screen ratios of the image converter 4 in these areas. Since the difference in brightness is determined by the mode of operation of the image converter 4, this difference is determined to be definite, and then the output of the subtraction unit 9 receives a signal depending only on the area 16 in which the light sections of the analyzed images coincide.

Claims (1)

Formula invented and An image analyzer comprising, sequentially installed, image playback units and an optical system, a spatial integrator and a photodetector, characterized in that, in order to improve the speed of the device, it contains an image converter installed between the optical a system and a spatial integrator, a memory unit whose input is connected to the photoreceiver output, a subtraction unit connected to the photodetector p outputs of the memory unit, and a clock pulse generator connected to the playback units of the images being analyzed, an image converter, a memory unit and the subtraction unit.