JP3080982B2 - Image processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image processing apparatus having an image compression unit and a compressed image storage unit.

2. Description of the Related Art As an image processing device having an image compression unit and a compressed image storage unit, for example, a page printer system is known. Compression was performed at a rate.

[Problems to be Solved by the Invention] However, the above-described conventional example has the following disadvantages.

If the compression is performed at a low compression ratio when the input image size is large, there is a possibility that the compressed image storage unit will not be able to be filled.

Further, when compression is performed at a high compression ratio, it is difficult to determine the original image in a small image.

An object of the present invention is to provide an image processing apparatus which solves the above problems.

[Means for Solving the Problems] To achieve the above object, an image processing apparatus of the present invention has the following configuration.

That is, an image processing apparatus having an image compression unit for compressing an input image and a compressed image storage unit for storing an image compressed by the image compression unit, wherein a vertical size and a horizontal size of the input image are independently set. Identification means for identifying the input image size based on the header information represented by the header information; and the image compression means according to the image size based on the header information independently representing the vertical size and the horizontal size identified by the identification means. And setting means for setting the compression ratio of the input image according to (1).

[Operation] In the above configuration, the input image is compressed at a compression rate corresponding to the image size obtained based on the header information independently representing the vertical size and the horizontal size of the input image, and stored in the compressed image storage means. I do.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

<Description of Configuration (FIG. 1)> FIG. 1 is a system configuration diagram showing an image processing apparatus according to the present embodiment.

In the image processing apparatus 1, reference numeral 3 denotes a main control unit,
It comprises a CPU for controlling the entire image processing apparatus 1 of this embodiment in accordance with a program shown in FIG. 3, which will be described later, and its peripheral circuits. Reference numeral 2 denotes an input control unit which controls input of input image data. Reference numeral 4 denotes a main storage unit which stores compressed data and the like in addition to the image processing program executed by the main control unit 3 described above. Reference numeral 5 denotes an image identification unit that identifies the size of the input image. A compression ratio setting unit 6 sets an appropriate compression ratio based on the image size identified by the image identification unit 5, and sets a compression quantization matrix, a compression method, and the like. Reference numeral 8 denotes a compressed image storage unit composed of, for example, a magnetic disk device or the like, which stores an image compressed by the compression unit 7 and outputs the image as needed.

<Data Format (FIG. 2)> An example of an image data format used in the image processing apparatus 1 having the above configuration will be described below with reference to FIG.

As shown in the figure, in the present embodiment, a header section composed of frames 21 to 23 and a main body section 24 are provided. The header sections 21 to 23 include a vertical size frame 21 indicating the size of the vertical image, a horizontal size frame 22 indicating the size of the horizontal image, and another frame 23 for writing comments and other information. Information (images) written in the main body frame 24 covers all images that can be handled as digital data.

<Explanation of Processing Procedure (FIG. 3)> Next, the compression processing in the image processing apparatus 1 in the present embodiment will be described with reference to the flowchart shown in FIG.

As described above, the image processing device 1 executes the following processing under the control of the main control unit 3 according to the image processing program stored in the main storage unit 4.

When the input image is input to the input control unit 2 and an image is detected by the input control unit 2, the process of step S1 is started. In this step S1, the size type frames 21 and 22 of the received image are checked to identify the size A of the image.

After identifying the image size, the process proceeds to S2. If the image size S is larger than a certain value A, the process proceeds to S3, and if smaller, the process proceeds to S4. In S3 and S4, a compression ratio suitable for the image size is selected. This process is a process performed by the setting unit 6. In S2, the case may be further subdivided and classified.

Then, in S5, the input image is compressed at the compression ratio set in S3, S4, and stored in the compressed image storage unit 8 in S6.

[Effects of the Invention] According to the present invention, the size of an input image is identified based on the vertical size and the horizontal size independently represented by the header information of the input image. , It is possible to determine the size of the input image accurately and quickly,
Processing for setting the compression ratio appropriately at high speed can be performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an image processing system according to an embodiment of the present invention, FIG. 2 is a diagram illustrating an example of an image data format used in the embodiment, and FIG. 3 is a diagram illustrating image compression processing in the embodiment. It is a flowchart. DESCRIPTION OF SYMBOLS 1 ... Image processing apparatus, 2 ... Input control part, 3 ... Main control part, 4 ... Main storage part, 5 ... Image identification part, 6 ... Compression rate setting part, 7 ... Compression part, 8 .... Compressed image storage unit.

Claims (1)

(57) [Claims] 1. An image processing apparatus comprising: an image compression means for compressing an input image; and a compressed image storage means for storing an image compressed by the image compression means. Identification means for identifying the input image size based on the header information independently representing each; and the vertical size and the horizontal size identified by the identification means according to the image size based on the header information each independently representing the size. Setting means for setting a compression ratio of the input image by the image compression means.