SU115995A1 - Convergent device - Google Patents

Description

A convergent device to stereophotogrammetric instruments is proposed for converting distorted point coordinates to their true values when processing aerial photographs.

A distinctive feature of the proposed device is the ability to transform the coordinates of points of aerial photographs, distorted under the influence of the angle of inclination, simultaneously on two axes l: and g /.

The proposed device is made in the form of a hinged parallelogram with four cardan.

FIG. 1 depicts the proposed converged device; in fig. 2 - two connected corrector; in fig. 3 shows diagrams of a stereophotogrammetric instrument with the proposed convergent device.

A convergent device mechanically solves formulas of the form;

, 1 Z)

Two zasekayushas, their rods 7 and 2 (Fig. 1), one of which is lead, and the other driven, are fixed on the axles in cardan shafts 5 and 4. Cardan shafts 5 and 4 are on two semi-axes x 5 and 5. from the semi-axes, it is possible to rotate together with the beam relative to the other semi-axis and another beam at a certain angle a, the magnitude of which is measured over limb 6.

With alidade 6, bonded to limb 6, axles 5 and 5 constitute one axis, which may be embedded in sleeves 7 and S. On intersecting rods x and 2 are some distance from cardan 5 and there are other cardan 9 and which are attached two stanna 11 and 12, uniuup1, ies one to another. Due to the spring 13, the distance between the centers of the cardan 9 and 10 all the time remains constant equal to the distance between the centers of the cardan 3 д 4.

„„ / Sin a + l-cos a. ,,

7 cos a - .xsin

Y Z-f: G2)

/ cos k - .xsm

oVo 115995-2 -

Expansion rods 14 and 15 ensure constant parallelism between the rods 11 and 12 and the semiaxes 5 and 5.

When moving the carriage 7 & along the axes x x and i / g /, the closing rod /, turning at angles; 3, turns the rod 2 at the same angles, which, in turn, moves the carriage 17 along the axes xx, yy However, this takes place only in the case when rods 1 and 2 are parallel, that is, when the angle is set on the limb, equal to zero.

Let the intersecting rays occupy the position of AS and AS. The distance from the center S to the plane x y is Z, and from the center 5 to the plane xy is f.

Let us turn the semi-axis 5 relative to the half-axis 5 by the angle a. The notching rod / will rotate in this case by an angle ", the projection of which onto the main vertical will be equal to the angle of rotation a. The rod 11 will move parallel to its former position and will take a position of 1 G, whereby the distance between the centers of the cardan shields 9 E 10 will remain the same. This will ensure that the angle 3 is unchanged, which is required by the condition.

At this time, the carriage 16 in the xy plane will describe the curve and go from point A to point A. Here, the relationship between the coordinates of the point f (x, y) and the point a (xy) is expressed by formulas 1 and 2.

In order to transform a picture distorted by the two angles of inclination a and, two described convergent devices should be used, fastened to each other at a right angle (Fig. 2), which solve the following formulas for the connection of the coordinates of the picture and the screen: d: cos k-- (/ cos (O - ysino) sina (f cos O) -)) sin (u) cos a - l: sin a

y .. z, -. ycos.sinc.

(jcosm-; Sin со). COS a - A sin a

The bed /, serving as the base of the device (Fig. 3), is located on the lifting screws (not shown in the drawing). On base 1 on rollers 2 along base axis, base 2 moves, on which base 3 moves along rollers 3 along axis XX. A vertical column 4 of axis z is attached in front of base 3. In column 4, the base carriage is moved on both sides of which the supports are placed b. and Supports 6 and 6 are attached to supports 6 and 6., on which tubular supports B are fixed, and 6.,. In the upper part of frame 3, carriages 6 and 6 move along axes XX and xx. On carriages 6 and 6, image holders 7 and 7 move along axes y and y, on which images or negatives are located.

Snapshots 7 and 7 and calipers by and b are connected by means of paired convergent offsets 8 and (9, suspended in sleeves 9 and 9. A drawing device 10 is attached to the right of the carriage 3.

The device is designed for the case when:

And what; l: -y-0; &, .- & .- 0; b ,, - Q; b, b 0; .r y

Subject invention

Claims (2)

1. Convergent device to stereophotogrammetric devices, made in the form of a hinged parallelogram equipped with cardans, characterized in that, in order to transform aerial photographs simultaneously on two axes, the two parallel-parallel vertical arms of this parallelogram are made in the form of cutting rods fixed to cardans, and of two mutually parallel horizontal body shoulders - in the form of two semi-axes, one of which is equipped with a reading limb and is made with the possibility of turning the semi-axis along with cutting rod on the angle of the picture. 2. The device according to claim 1, characterized in that, in order to ensure the mutual parallelism of the intersection rods and two pairs of semi-axes, it is provided with a spring and spacer bars respectively. FIG.