CH683951A5 - Method and apparatus for reproducing an image in two different formats. - Google Patents

Description

1

CH 683 951 A5

2nd

description

The invention relates to a method according to the preamble of claim 1. In known methods, the switch between the two formats is achieved by using a rotating prism. A disadvantage of the known methods is the mechanical effort to move the rotating prism and the time required for this.

Especially when automatically enlarging a large number of rectangular images onto a carrier with a predetermined width and any length, images can follow one another, the first of which is to be enlarged in a first format and the subsequent one in a second format of different sizes.

Such situations occur particularly in so-called customer laboratories, when individual images from a series are to be enlarged in a larger format than the other images in the series at the customer's request.

It is an object of the invention to provide a method in which individual images of a series can be enlarged in a larger format without the time-consuming movement of the rotating prism being necessary.

This object is achieved by the invention described in the characterizing part of claim 1.

The invention adopts the knowledge that in an enlargement process in which the image to be enlarged is first converted into electronic image signals, then displayed on an electron beam tube and transferred from there to the photosensitive carrier, the enlargement and the 90 ° Rotation between the individual formats can be done electronically.

In a technically advantageous simple embodiment of the invention, the position of the image is achieved by interchanging the horizontal and vertical deflection devices of the electron beam tube.

In a further development of the invention it is provided to achieve the different size of the image by changing the horizontal and vertical deflection current of the electron beam tube.

For certain applications, it can be advantageous to achieve the different size of the image by alternately using lenses with different imaging scales. This is particularly advantageous if the image area of the electron beam tube is too small to display an electronically enlarged image.

In a further development of the invention, it is provided that the electronic measures for rotating the position of the image and for enlarging the image take place in an image processing unit which comprises a digital image memory.

The invention is explained in more detail below with reference to a figure. It shows:

Fig. 1 shows the basic structure of a device for performing the method.

An image is displayed on an electron beam tube 1 and transferred to a photosensitive carrier 3 via an objective 2. The carrier 3 has a predetermined width B and an undetermined length. In the example shown, the carrier 3 is on two rollers 3a, 3b. After exposure of an image on the photosensitive carrier 3, the latter is correspondingly transported further, so that an unexposed area on the carrier 3 is available for the next enlargement process.

With rectangular image templates it is possible to display a rectangular image in two different sizes on the same support. In the smaller format, the longer side of the image corresponds essentially to the width B of the carrier 3. An area corresponding to the narrow side of the image is exposed from the carrier 3. When displaying in the second, larger format, the image is rotated by 90 ° and enlarged compared to the first format. The entire width B of the carrier 3 is now available for the narrow side of the image, the exposed area on the carrier 3 extends essentially over the long side of the image. In the drawing, the exposure area for the first format is numbered 3c and identified by cross hatching. The area 3d for the second format is filled with a simple oblique hatching.

The rotation of the image position by 90 ° required for enlargement in the second format can be done in a switchover unit 4 in a simple manner by interchanging the horizontal and vertical deflection signals.

The necessary enlargement to the second format is then carried out by a second lens 2a, which e.g. is brought into the beam path 6 via an electromagnet 5a actuated by a lens control 5.

If a sufficiently large picture tube 1 is used, in addition to the electronic rotation of the picture, an electronic enlargement, for example by enlarging the horizontal and vertical deflection current in the amplifier unit 4c, can also be used to display the second format 3d.

The format changeover can also be achieved fully electronically without the use of mechanics by using a digital image processing device 7. This device 7 processes the incoming image signals S and generates - separately for the vertical deflection 4a and the horizontal deflection 4b - the deflection signals required to display the image in the correct format position and size.

Claims (8)

Claims 1. A method for reproducing a rectangular image shown on an electron beam tube on a carrier with a given width and any length in a first or second format of different sizes, the position of the image in the second format being rotated by 90 ° with respect to the first format and the Width of the carrier in the first format essentially the long side of the image and in the second format in 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 2nd 3rd CH 683 951 A5 essentially corresponds to the narrow side of the image, characterized in that for reproduction in the second format (3d) by electronic measures, both the position of the image on the electron tube compared to the position of the image in the first format (3c) is rotated by 90 ° and the different sizes of the two formats is achieved. 2. The method according to claim 1, characterized in that the electronic measures comprise interchanging the horizontal (4b) and vertical (4a) deflection device of the electron beam tube. 3. The method according to claim 1, characterized in that the different size of the images is achieved by changing the horizontal and vertical deflection current of the electron beam tube. 4. The method according to claim 1, characterized in that the electronic measures comprise an image processing (7) interacting with a digital image memory. 5. A method for reproducing a rectangular image shown on an electron beam tube on a carrier with a predetermined width and any length in a first or second format of different sizes, the position of the image in the second format being rotated by 90 ° with respect to the first format and the Width of the carrier in the first format essentially corresponds to the long side of the image and in the second format essentially corresponds to the narrow side of the image, characterized in that for the reproduction in the second format (3d) by electronic measures the position of the image on the electron beam tube relative to the position of the Image in the first format (3c) rotated by 90 ° and the different size of the images is achieved by using lenses with different imaging scales (2, 2a). 6. Device for performing the method according to claim 1, characterized in that - A switchover unit (4) is provided, in which, depending on the format (3c, 3d), the horizontal and vertical deflection voltage for the electron beam tube (1) are interchanged and - An amplifier unit (4c) depending on the format (3c, 3d) amplifies the deflection voltage differently. 7. The device for performing the method according to claim 1, characterized in that an image processing device (7) is provided which generates the deflection signals for the electron beam tube (1) depending on the respective format (3c, 3d). 8. An apparatus for performing the method according to claim 5, characterized in that a lens control (5) depending on the format (3c, 3d) different lenses (2, 2a) in the beam path (6) between the electron beam tube (1) and carrier (3rd ) positioned. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 3rd