JPH04270567A - Picture transmitter - Google Patents

Abstract

PURPOSE:To realize high speed picture transmission by devising the transmitter to extract directly a compressed picture data in the picture transmitter sending/ receiving the picture data so as to omit the expansion processing in the picture transmitter. CONSTITUTION:A picture data is inputted to a picture compression section 13 and the compressed picture data is outputted from a compressed picture data output section 19. Thus, the expansion processing to send an expanded picture is omitted in the sender side picture transmitter and the compression processing of the received expanded picture data is omitted at the receiver side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission apparatus for transmitting and receiving image data, and more particularly to an image transmission apparatus for transmitting and receiving compressed image data.

0002

2. Description of the Related Art FIG. 3 is a block diagram showing the configuration of a conventional image transmission device. In FIG. 3, 31 is an image data input section, 32 is an image data output section, 33 is an image compression section,
34 is an image expansion section, 35 is a data reception section, 36 is a data transmission section, 37 is an expanded image storage section, and 38 is a compressed image storage section.

Next, the operation of image transmission by the above-mentioned conventional image transmission apparatus will be explained with reference to the drawings.

[0004] As shown in the schematic process of image transmission by the conventional image transmission apparatus described above in FIG. 4, inputted image data is first compressed on the transmitting side and then transmitted to the receiving side. In the image transmission device on the receiving side, the compressed image data sent from the transmitting side is received by the data receiving section and stored in the compressed image storage section 38. The accumulated compressed image data is decompressed by the image decompression section 34 and then transferred to the decompressed image storage section 37.
is accumulated in This expanded image data is output by the image data output section 32.

[0005] As described above, the conventional image transmission apparatus decompresses the received compressed image data and outputs it as decompressed image data.

[0006]

However, the conventional image transmission apparatus described above has a drawback in that compressed image data cannot be output from the image transmission apparatus. The present invention is intended to solve these conventional problems, and aims to provide an excellent image transmission device that can directly retrieve compressed image data from the image transmission device.

[0007]

[Means for Solving the Problems] In order to achieve the above object, an image transmission device according to the present invention includes an image compression section that compresses input image data, and an image compression section that outputs the image data compressed by the image compression section. The apparatus includes a compressed image data output section, an image expansion section that expands the image data compressed by the image compression section, and an image data output section that outputs the image data expanded by the image expansion section.

[0008]

[Operation] Therefore, the compressed image data output section directly outputs the compressed image data, thereby omitting the decompression process of the image data, and also omitting the compression process in other devices that input the compressed image data. It has the effect of being able to. Furthermore, since compressed image data has a smaller amount of information than expanded image data, it has the effect of allowing high-speed image transmission.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an image transmission apparatus which is an embodiment of the present invention. In FIG. 1, 11 is an image data input section, and 12 is an image data output section, which are connected by an analog image input/output line (NTSC) 20 or a digital interface line (RS232C) 21. 13 is an image compression unit, 14 is an image expansion unit, 15 is a data reception unit, 16 is a data transmission unit, 17 is an expanded image storage unit,
Reference numeral 18 denotes a compressed image storage section, which in this embodiment also has a function of outputting decompressed image data similar to the conventional one. 19 is a compressed image data output section, to which a digital interface line (RS232C) 21 is connected.

Next, the operation of the above embodiment will be explained. As shown in the schematic process of image transmission by the image transmission apparatus of this embodiment in FIG. 2, on the transmitting side, input image data is compressed in the same manner as in the conventional method, and then transmitted to the receiving side. In the image transmission device on the receiving side, the compressed image data sent from the transmitting side is received by the data receiving section 16 and stored in the compressed image storage section 18. Next, when outputting decompressed image data, the compressed image data is decompressed by the image decompression section 14 and the decompressed image storage section 1
7 is temporarily accumulated. When outputting compressed image data, the compressed image data is taken out from the compressed image storage section 18 and directly outputted by the compressed image data output section 19 via the RS232C line.

As described above, according to the above embodiment, the compressed image data output unit 19 directly outputs the compressed image data, so that the image decompression process for outputting the decompressed image data, which was conventionally performed, can be omitted. Can be done. Furthermore, since the compressed image data to be output requires a smaller amount of information than the decompressed image data, it has the advantage of being able to perform high-speed image transmission.

0012

[Effects of the Invention] As is clear from the above embodiments, the present invention outputs compressed image data directly from the image transmission device, so that the image data decompression process within the image transmission device can be omitted. It also has the advantage that compression processing in other devices that input compressed image data can be omitted. Furthermore, it has the advantage that image data can be transmitted faster than decompressed image data.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an image transmission device that is an embodiment of the present invention.

[Fig. 2] Diagram showing a general flow of processing according to this embodiment

[Figure 3
] Schematic block diagram of conventional image transmission device

[Fig. 4] Diagram showing a general flow of processing by a conventional image transmission device

[Brief explanation of symbols]

11 Image data input section 12 Image data output section 13 Image compression section 14 Image expansion section 19 Compressed image data output section

Claims (1)

[Claims] 1. An image compression unit that compresses input image data; a compressed image data output unit that outputs the image data compressed by the image compression unit; and an image compression unit that expands the image data compressed by the image compression unit. An image transmission device comprising: an image decompression section; and an image data output section that outputs image data decompressed by the image decompression section.