DE2725364C3 - Process for the simultaneous visual display of several different individual images - Google Patents

Description

Summary in

A video signal processing method is proposed for the simultaneous display of a sequence of several individual images of a recorded video signal on the screen of a video display device. According to the method, of every single image of a sequence of images in the horizontal and vertical direction, only every m- \ e pixel is read into an image memory. This associated image compilation allows several (m ^:) images of an image sequence to be read into the image memory, w For simultaneous display on the screen of the video display device, the image memory is read out repeatedly.

State of the art

The invention is based on a method according to the preamble of the main claim.

In the case of video magnetic tape recorders, a distinction is made between those with one on each of the In the longitudinal direction of the magnetic tape deviating track a field is recorded, and those in which a field is recorded in several adjacent tracks. While with the former The type of video tape recorder that can play back individual images is the latter Kind of a still image playback without a buffer memory is not possible.

In the magazine "Radio Mentor", 1967, pages 912 to 916, a television slow-motion device is used a magnetic disk storage described in which during playback of the regular recorded video tracks with reduced tape speed a special head wheel with offset Heads scanned the magnetic tape and the recorded video signal in a closed track The known device works with a fixed disk Slow motion ratio of 1: 5 and requires a great deal of mechanical effort: the representation

wegter single images are not provided.

In the same reference there is also a special machine with intermittent tape transport and a film buffer with two on different Traces of working magnetic heads described. Here, too, is the slow motion ratio determined by the construction chosen.

From I) F-OS 2 207 096 is a television editing system known, in which selected fields of a sequence in concentric tracks of magnetic disks a disk memory can be recorded. When playing back the addresses are provided Image information read out by two reading devices and that by a first reading device Full image sequence on a first monitor, the image sequence read out by a second reading device made visible on a second monitor to determine the intersection point. Finally, for Rehearse the first series of pictures «? to the selected intersection and then the second sequence of images visible on the screens from the selected intersection be made, you simultaneous display of several The known system does not provide for individual images on the screen of a viewing device.

Advantages of the invention

The invention with the characterizing features On the other hand, the main requirement has the advantage that you have a video display device on the screen now not a single picture for me, but one entire image sequence cjes recorded video signal can be represented. This measure can be used, for example, in electronic editing the cutting positions can be determined much faster and more reliably, as the common * seme presentation of the overview of motion sequences is facilitated.

By the measure listed in the sub-claim an advantageous further development of the method specified in the main claim is possible.

drawings

Further advantages and details of the invention are given below with an exemplary embodiment described in more detail in a description below with reference to figures. It shows

Fig. 1 shows a time representation of a reproduced from a recording medium. '«A sequence of images Video signals, and

2 shows several variants of the presentation of compressed images of an image sequence on one Screen.

Description of the invention

In Fig. 1 is a schematic image sequence of a reproduced by a video magnetic tape recorder / calibration device Video signal shown. The sequence of images consists of several rub-in idems. It is essential whether fields or frames are meant in this context. Therefore, in the following only the expression (single) image is used. The individual images in this sequence are numbered 1, 2. 3 etc. marked.

According to the invention, each image of an image sequence reproduced from a recording medium to be stored in an image memory is compressed. The image compression takes place in such a way that of the image to be stored, only every m-th pixel is read into the image memory in the horizontal and vertical directions. will. In the present exemplary embodiment, the factor m = 2 was chosen. Under

this requirement, the image to be stored in the image memory is compressed in a ratio of 1: 4, see above that three more compressed images can be read into the image memory.

After reading in a sequence of four images The memory is stored in the image memory for display on a screen of a video display device read out repeatedly. The read-out is preferably controlled in this exemplary embodiment so. that a picture quartet is visible on the screen of the video display device (Fig. 2). Will be a consequence of four successive images (factor η = 1) are read into the image memory, a quartet of images is obtained according to FIG. 2a. Reading the Image memory takes place in the representation according to FIG. 2a in an order in which the top left Picture No. 1, top right picture No. 2, bottom left picture

> No. 3 and at the bottom right picture No. 4 becomes visible.

If, on the other hand, only every third image {n- 3) of the image sequence reproduced by the recording medium is read into the image memory, a representation according to FIG. 2b is obtained. In correspondence

a screen display according to FIG Fig. 2c obtained if only every sixth image (n = 6) the sequence of images reproduced by the recording medium is incorporated into the memory.

For this 1 sheet of drawing

Claims (2)

Patent claims: 1. A method for the simultaneous visual display of several different individual images, which are taken from a Ftrnsehbildsequc recorded in a memory, in which the selected individual images are successively entered into a buffer and are supplied to devices for visual reproduction by repeatedly reading out as still images, characterized in that from the recorded television picture sequence every n-le individual image is selected and from this every n-th pixel in the horizontal and vertical direction is entered into the intermediate memory with a storage capacity of no images with in each case ··· image points in order to obtain compressed images, and the contents of the intermediate memory «on is made visible on a screen, 2. The method according to claim 1, characterized in that the factors η and m can be selected separately.