JPS6248875A - Image compressing device - Google Patents

Abstract

PURPOSE:To reduce the volume of image compressed information by comparing the volume of compressed information obtained by encoding an image in plural scanning directions, such as a longitudinal, a lateral and an oblique directions, etc. and fetching the compressed information having the minimum volume of information into an image processor. CONSTITUTION:The image information accumulated in an image information memory 11 is scanned in the lateral and the longitudinal directions, being outputted as scan signals (a) and (b). Both signals are inputted to and compressed at a lateral and a longitudinal direction image compressor/expanders 2 and 3, being outputted to a compression information volume comparator device 4 as a lateral and a longitudinal direction compression information (c) and (d). These both compression information (c) and (d) are inputted to and accumulated at the comparator device 4, and at a time when an image compressing processing is completed, the volume of information of the accumulated compression information (c) and (d) are compared, either information having the minimum volume of information between two being outputted as image compression information (e).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus having an image processing function, and particularly to an image compression apparatus that aims to reduce the amount of compressed information of an image.

[Conventional technology]

Conventionally, this type of image compression apparatus compresses images by scanning in one direction determined by the apparatus.

[Problem that the invention seeks to solve]

In the conventional image compression apparatus described above, images are compressed by scanning in one direction, and depending on the image, there is a drawback that it is not always possible to select the scanning direction that minimizes the amount of image compression information.

[Means for solving problems]

In order to eliminate such drawbacks, the present invention provides a compression means for compressing an image in a plurality of scan directions, and a selection method for selecting compressed information with the least amount of information from among compressed information encoded in a plurality of scan directions. A means is provided.

C) In the present invention, the amount of compressed information obtained by encoding an image in multiple scanning directions such as vertical, horizontal, diagonal, etc. is compared, and the compressed information with the least amount of information is taken into the image processing device. , it is possible to reduce the amount of image compression information.

〔Example〕

An embodiment of an image compression device according to the present invention is shown in the figure. In the figure, 1 is an image memory device that stores image information in an image information memory 11, 2 is a horizontal image compressor/expander that compresses a horizontal scan signal a and outputs horizontally compressed information C, and 3 is a vertical image compressor/expander. A vertical image compressor/decompressor compresses the scan signal of C and outputs vertically compressed information d; 4 is horizontally compressed information C2 vertically compressed information d
This is a compressed information amount comparator device serving as a selection means for inputting and outputting one of them as image compression information e, and the horizontal image compression/expansion device 2 and the vertical image compression/expansion device 3 constitute the compression means.

In the image compression device configured as described above, first, the image information stored in the image information memory 11 of the image memory device 1 is scanned in the horizontal direction and the vertical direction, and the horizontal scan signal a and the vertical scan signal are all scanned. is output as

The horizontal scan signal a and the vertical scan signal S are respectively input to the horizontal image compression/expansion device 2 and the vertical image compression/expansion device 3, where they are compressed and converted into horizontal compression information C1 and vertical compression information d. It is output to the compressed information amount comparator device 4.

The horizontal compression information C and the vertical compression information d are input to the compression information amount comparator device 4 and stored. The compressed information amount comparator device 4 compares the information amounts of the stored compressed information c and d when the image compression process is completed, and outputs the one with the least amount of information as the image compressed information.

The figure shows a state in which the horizontally compressed information C is compared with the vertically compressed information d, and it is found that the horizontally compressed information C is smaller, and the horizontally compressed information C is output as the image compressed information e. It shows.

The compression means in this embodiment was composed of a horizontal image compression/expansion device 2 and a vertical image compression/expansion device 3, but if a diagonal image compression/expansion device is added, image compression can be further improved. It is possible to reduce the amount of information.

〔Effect of the invention〕

As explained above, the present invention compresses an image in a plurality of scan directions, and selects the compressed information with the least amount of information from among the compressed information encoded in the plurality of scan directions. Since the compressed information can be taken into the image processing device, there is an effect that the amount of image compressed information can be reduced.

[Brief explanation of drawings]

The figure is a system diagram showing an embodiment of an image compression device according to the present invention. 1... Image memory device, 2... Horizontal image compression/expansion device, 3... Vertical image compression/expansion device, 4... Compressed information amount comparator device, 11.
...Image information memory.

Claims (1)

[Claims] An image compression device that compresses an image and encodes information includes a compression means that compresses an image in a plurality of scan directions, and a compressed information that has the least amount of information among the compressed information encoded in the plurality of scan directions. What is claimed is: 1. An image compression device comprising: a selection means for selecting an image;