JPH03142686A - Image reader - Google Patents

Abstract

PURPOSE:To simplify an operation caused by the change of density by providing a density conversion means, and adding a correction value corresponding to read density instructed by a host device on image density information outputted from a storage means. CONSTITUTION:The device is provided with a reading part 1 which outputs the image density information corresponding to the density of a picture element comprising an image, an image information storage part 2 which stores the image density information outputted from the reading part 1, a density converter 3 which adjusts the density value of the image density information outputted from the image information storage part 2, and a host interface part 4 which takes interface with a host device. The density converter 3 adds the correction value corresponding to the read density instructed by the host device on outputted image density information, and changes the density of the image density information to the one corresponding to the instruction of the host device. In such a way, it is not required to perform a reading operation again when the density of the image read once is changed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image reading device that inputs image information by connecting to an information processing device such as a word processor, personal computer, or workstation, and particularly relates to an image reading device that inputs image information by connecting to an information processing device such as a word processor, a personal computer, or a workstation. The present invention relates to an image reading device that can adjust the density of images.

[Prior Art] Conventionally, input of image information by an image reading device has been performed in the following procedure. That is, after setting the reading density of the image reading device in advance and reading desired image information, the read image information is displayed on a monitor device of an information processing device or printed by a printer.
By visually confirming the input image information, it is determined whether the density of the read image is appropriate.

[Problems to be Solved by the Invention] In the conventional image reading device described above, when changing the density of input image information, the image reading device must reset the reading density of the image reading device and then read the image information again. needed to be read. Therefore, there is a drawback that it takes time to adjust the density of image information.

[Means for Solving the Problems] The image reading device of the present invention has a storage means for storing read image density information, and a correction value corresponding to the read density instructed by the host device, and stores the correction value from the storage means. and density conversion means for adding a correction value to the density value of the output image density information.

[Operation] The density conversion means adds a correction value according to the reading density instructed by the host device to the image density information output from the storage means, and converts the density of the image density information according to the instruction from the host device. Change to concentration.

[Example code] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the image reading and collecting apparatus of the present invention, FIG. 2 is a block diagram of a south image density information storage section, and FIG. 3 is a block diagram of a density converter.

In FIG. 1, 1 is a reading unit that outputs image density information according to the density of the image constituent pixels that make up the image, and 2 is image information that stores the image density information output from the reading unit 1. A storage section 3 is a density converter that adjusts the density value of image density information output from the image information storage section 2, and 4 is an upper interface section that interfaces with an upper device (not shown).

As shown in FIG. 2(a), the image density information storage section 2 includes an image density information storage section 21 that stores image density information in units of one pixel, and a physical memory of this image density information storage section 21. It is composed of a controller 22 that manages addresses and logical vertical and horizontal coordinates in image density information. Further, as shown in FIG. 2(b), the image density information storage section 21 is composed of cells 23 in units of 1 byte, and image density information for one pixel is stored in one cell 23.

Further, as shown in FIG. 3, the density converter 3 converts the difference between the read density specified by the host device and the read density when reading the image density information stored in the image density information storage unit 21. and an adder 32 that adds the correction value held in the correction register 31 to the image information input from the image density information storage section 2 and outputs it to the upper interface 4. ing.

Next, the operation will be explained with reference to the flowchart shown in FIG.

First, an image is read by the reading unit l (step 101), the density of each pixel making up the read image is digitized, and the numerical value (density value) is stored in the image density information storage unit 21 as image density information. (Step 102
).

Next 1. From E position negative W (not shown), it is determined whether or not a density change instruction has been given to the image reading device, that is, an instruction to change the reading density and read the image again (step 103). , if the result is "N", the image density information stored in the image density information storage section 21 is sent to the host device as image data (step 107).

If the result in step 103 is "Y", the reading part l
Step 104 ) +Read out the image density information of all the pixel bones stored in the image information density storage unit 21 without re-reading the information in the image density information storage unit 21 in the density converter 3. A numerical value corresponding to the difference between the read density when the image density information is read and the read density specified by the host device at the time of the density change instruction is calculated and stored as a correction value in the correction register 31 (Step 105), and added. The correction value of the correction register 31 is added to the image density information read from the image density information storage section 21 in the device 32 to correct the density value of the image density information (step 106), and the image density information thus corrected is corrected. The image data is sent to the host device via the host interface 4.

[Effects of the Invention] As explained above, according to the image reading device of the present invention, the density conversion means converts the image density information outputted from the storage means according to the reading density instructed by the host device. The correction value is added to change the density of the image density information to the density according to the instruction from the host device. Therefore, when changing the density of an image that has been read once, there is no need to perform the reading operation again, which has the effect of simplifying the operation associated with changing the density.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the image reading device of the present invention, FIG. 2 is a block diagram of the image density information storage section, FIG. 3 is a block diagram of the density converter, and FIG. 4 is a block diagram of the image reading device. It is an operation flowchart. ■...reading unit, 2...image density information storage unit (storage means), 3...-density converter (density conversion means),
4... Upper interface unit, 21... Controller, 22... Image density information storage unit, 31... Correction value register, 32... Adder.

Claims (1)

[Scope of Claims] An image reading device that reads an image and sends image density information of pixels constituting the image to a host device as image data, comprising: a storage device that stores the read image density information; and a device that the host device instructs. An image reading apparatus comprising: density conversion means for holding a correction value corresponding to a reading density, and adding the correction value to a density value of image density information output from the storage means.