JPH08211844A - Image display method - Google Patents

Abstract

PURPOSE: To provide an image display method capable of displaying an image on a pixel group arranged zigzag without making ruggedness conspicuous on a boundary part of the image data. CONSTITUTION: The pixels on matrix structure arrangement are made to correspond to the pixels on zigzag structure arrangement, and the pixel P1 shifted from the position on the matrix structure in the direction of an X is displayed as the image data of a halftone obtained by averaging the image data of the pixel P2 , the pixel P3 , the pixel P4 , the pixel P5 , the pixel P6 and the pixel P7 being peripheral pixels of the pixel P1 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display method,
In particular, it relates to an image display method for displaying digital image data on each pixel arranged in a staggered structure.

[0002]

2. Description of the Related Art Conventionally, there has been a liquid crystal display device applied to a television monitor or the like. A liquid crystal display device is assembled by using a liquid crystal panel as a main component. This liquid crystal panel is applied to a printer that displays a digital image and projects the transmitted image onto a photosensitive material for printing.

However, the pixel arrangement in the liquid crystal panel is
Generally, it has a zigzag structure, and when displaying binary data such as characters and figures, the boundary parts such as straight lines and curved parts may be markedly uneven due to the zigzag structure arrangement (Fig. 2).
(A)). Even at the boundary between two different hues, if the hues are significantly different, the unevenness of the color will be noticeable.

In order to make the unevenness inconspicuous, the pixel density is increased to make the unevenness finer, but the pixel density in the liquid crystal panel is limited because of the required wiring space. However, it is difficult to completely eliminate unevenness.

[0005]

The present invention has been made in consideration of the above facts, and when displaying image data in a pixel group arranged in a zigzag structure, a zigzag structure is formed in a boundary portion of the image data. An object of the present invention is to provide an image display method capable of displaying irregularities due to arrangement without making them conspicuous.

[0006]

According to a first aspect of the present invention, there is provided an image display method for displaying digital image data on each pixel arranged in a staggered structure, wherein the image data has a boundary portion having a different hue. If present, the pixels on the staggered structure existing at positions displaced in the X or Y direction from the positions when the image data are arranged in a matrix structure,
It is characterized in that at least one of the two kinds of hues of the boundary portion is displayed with an intermediate gradation.

The image display method according to claim 2 is an image display method for displaying digital image data represented by binary data of white or black on each pixel arranged in a staggered structure. Pixels in a zigzag structure, which form a boundary portion of an image and are present at positions displaced in the X or Y direction from the positions where the image data are arranged in a matrix structure, are displayed in the white or black intermediate gradation. It is characterized by

[0008]

According to the first aspect of the present invention, when the image data is displayed on the pixels arranged in the zigzag structure, when there are boundaries having different hues, X or when the pixels are arranged in the matrix structure. Since the pixels in the staggered structure deviated in the Y direction are displayed with the intermediate gradation of the hue of the boundary portion, the boundary portion of the image data can be displayed without conspicuous unevenness. For example, in the case of the boundary portion between red and yellow, the unevenness can be made unnoticeable by setting the halftone, that is, the boundary portion of red as an intermediate gradation.

According to the second aspect of the invention, when displaying the binary data of white and black on the pixels arranged in the staggered structure, the boundary portion of the white or black image is formed and arranged in the matrix structure. In this case, since the pixels in the zigzag structure existing at the positions displaced in the X or Y direction are displayed with the intermediate gradation of white or black, in the character or the like represented by the binary data of white or black, It is possible to display the contours of characters and the like without making the irregularities conspicuous.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an image processing apparatus 10 to which the present invention can be applied. The image processing device 10
Image reading unit 12, image printing unit 14, and image signal processing unit 16
It consists of and.

The image reading section 12 includes a light source 18 composed of a halogen lamp and a reflector. In the optical path L of the light beam emitted from the light source 18, a long negative film 22 is arranged with the light diffusing cylinder 20 in between. The negative film 22 is positioned at a predetermined position by a negative mask (not shown), and is sandwiched by conveyance rollers (not shown) to be conveyed from one side to the other side.

A filter 26 for each color of C (cyan), M (magenta), and Y (yellow) is arranged on the optical path L above the negative film 22 in FIG. Each of these filters 26 includes a driver 28.
Depending on the signal from, the optical path is inserted or removed from the optical path L. Further, the lens 24 is movable along the optical path L, so that the enlargement magnification can be changed.

A CCD image pickup device 30 is disposed above the filter 26 in FIG. 1 and at the uppermost part of the optical path L. The CCD image pickup device 30 includes a driver 32, then A
A signal which is connected to the A / D converter 34 and picked up by the CCD image pickup device 30 is input to the driver 32, and then A /
The digital signal is converted by the D converter 34.

The A / D converter 34 is connected to the image signal processing unit 16 via the input terminal of the selector 62, and sends the converted digital signal to the image signal processing unit 16.

On the other hand, the image printing unit 14 includes the image reading unit 12
A light source 36 similar to the above is provided. The condenser lens 38 is sandwiched in the optical path M of the light beam emitted from the light source 36,
Filters 40 of each color of C, M and Y are arranged.
Each of these filters 40 is inserted into or removed from the optical path L according to a signal from the driver 42.

The optical path M above the filter 40 in FIG.
A liquid crystal panel (LCD) 44 is arranged in the. L
The CD 44 has a staggered pixel array, and a driver 46
And the D / A converter 48, and is connected to the image signal processing unit 16. The driver 46 drives the LCD 44 according to the signal output from the selector 64 of the image signal processing unit 16 and converted by the D / A converter 48. It should be noted that each pixel is controlled by 256 gradation data.

The optical path M above the filter 40 in FIG.
Includes a black shutter 52 with a printing lens 50 sandwiched therebetween.
Is arranged. The black shutter 52 opens and closes according to the drive signal from the driver 54, and allows the light on the optical path M to pass or be blocked. Further, the printing lens 50 is movable along the optical path M, so that the enlargement magnification can be changed.

A roll-shaped photographic paper 56 is arranged above the black shutter 52 in FIG. 1 and at the uppermost part of the optical path M, and a conveying roller 58 fixes a part of the roll-shaped photographic paper 56 at a predetermined printing position. ing. Both ends of the rolled photographic paper 56 are wound in layers on the rotary shaft 60, and the leading edge of the photographic paper is drawn from one side to the other from the outer periphery of the winding.

The selector 62 is an input frame memory 6
6 is connected to the image data processing unit 68 via 6, and the signal picked up by the CCD image pickup device 30 is decomposed into RGB components, expanded in the input frame memory 66, and then sent to the image data processing unit 68. It has become.

A character generation circuit 70 is connected to the image data processing unit 68 so that binary data such as characters and figures can be input from the outside.
Therefore, when binary data is input from the outside,
The image data processing unit 68 inputs the input image data of each component after expansion and the input 2 via the character generation circuit 42.
Predetermined processing can be performed on the value data.

The input binary data is mixed with the image data developed in the input frame memory 66 by the data mixing section 74 in the image data processing section 68. With respect to the mixed image data, the boundary selecting unit 76 selects the pixels forming the boundary, and the pixel extracting unit 78 converts the image data into pixels in a staggered structure from the selected pixels. When expanded, pixels associated with positions shifted in the X or Y direction from the positions when arranged in a matrix structure are extracted. The extracted pixels have their gradations adjusted by the gradation adjusting unit 80 based on the gradations of the image data of the peripheral pixels, and are changed to the adjusted intermediate gradation image data by the data fixing unit 82, and output. It is output to the frame memory 72 for use.

This will be described with reference to FIG. FIG.
At the bottom of (B), one straight line is displayed as an image.
It is shown. Also, in the upper row, the image data of this straight line
Expansion when expanded to pixels arranged in a matrix structure
Figure is shown, while in the middle is the image shown in the top.
When an image is developed corresponding to pixels arranged in a staggered structure
Enlarged views of each are shown. On matrix structure array
Pixel P₁Develops corresponding to the pixels on the staggered array
Pixel P₁₁Corresponding to. Pixel P₁₁Is shown in FIG.
(B) When the vertical direction in the upper row is the Y direction, the pixel
P₁Is shifted in the X direction. Pixel P₁₁Is taken out
Pixel P₁Pixels around, eg on staggered array
P₁₁On the matrix structure array corresponding to the pixels surrounding
Pixel₂, Pixel P ₃, Pixel P_Four, Pixel P_Five, Pixel P₆as well as
Pixel P₇By averaging the image data of
Pixel P₁The image data gradation is adjusted to an appropriate level.
It is displayed as inter-tone image data. In addition, uniquely
It may be gray image data. Therefore, the output frame
The image output to the memory 72 is shown in the middle of FIG.
As shown in the lower part, the unevenness of the image is visible at the boundary.
The image will not stand.

Next, the operation of this embodiment will be described. Each image frame is positioned while the negative film 22 is nipped and conveyed by a conveyance roller (not shown) in the printing / reading section 12, and the light source 1
The image exposed by 8 passes through the filter 26 to C
When the image is picked up by the CD image pickup device 30, it is decomposed into RGB components and sent to the image data processing unit 68. If binary data such as a character is input via the character generation circuit 70, the binary data and the image data of the read image are mixed in the image data processing unit 68, and the image of the boundary portion has concavities and convexities. The image is processed so that it does not exist, is expanded in the output frame memory 72, and the image after this processing is displayed on the LCD 44.
Is displayed in. The image displayed on the LCD 44 is transmitted by the light source 36 through the filter 40 and printed on the photographic printing paper 56. The photographic printing paper 56 having the printed image printed thereon is conveyed to a processor unit (not shown) and developed, and then cut into individual image frames and discharged.

Next, the image display method in this embodiment will be described in detail with reference to the flowchart shown in FIG.

The CCD image pickup device 30 picks up a negative image,
When a character or the like is input from the character generation circuit 70, image data is input to the input frame memory 66 in step 100. When the image data is input, in step 102, it is developed into a pixel group on a matrix structure.

In step 104, it is determined whether the image data developed in the pixel group on the matrix structure constitutes an image of the boundary portion. If the image data forms the image of the boundary, the determination is affirmative and step 10
6, the pixels are associated with the pixel group on the zigzag structure of the LCD 44.

Corresponding to the pixel group on the staggered structure,
In step 108, it is determined whether the associated pixel is a pixel at a position displaced in the X or Y direction from the position on the matrix structure. The determination is affirmative if it corresponds to a pixel at a displaced position. If the determination is affirmative, in step 110, the image data of the peripheral pixels in the case of the matrix structure are averaged to adjust the gradation, and the image data of the intermediate gradation is obtained. The image is displayed.

On the other hand, when the determination in step 104 is negative because it is not the image data forming the image of the boundary portion, in step 114, it is associated with the pixel group on the staggered structure as in the case where the determination is positive. Then, the process proceeds to step 112, and the image is displayed as described above.

If the determination in step 108 is negative because the associated pixel is not a pixel whose position is displaced, the process proceeds to step 112, and the image is displayed in the same manner as above.

In accordance with the above processing, the pixels on the staggered structure which form the boundary portion and are displaced from each other display the image signal of the intermediate gradation, so that the image displayed on the LCD 44 is an image of the unevenness of the boundary portion. It can be a bad image.

Although the image signals represented by binary data are used in this embodiment, the present invention can be applied to two types of image signals having different hues. In this case,
A boundary determination unit is provided between the boundary selection unit 76 and the pixel extraction unit 78 in. The boundary determining unit determines whether or not the difference between the two types of hues forming the boundary portion clearly causes unevenness at the boundary portion. For example, when red and yellow form a boundary, the unevenness of the boundary is more noticeable than when red and purple form a boundary. In this case, the intermediate gradation is applied to either one of the two types of image signals, for example, image data having a more noticeable hue.

Further, although the LCD is used in this embodiment, it is not particularly limited as long as it is a display means in which a plurality of pixel groups has an arrangement in which unevenness occurs. In particular, when displaying an image, it is not necessary to apply to an image forming apparatus, and it can be applied to various display devices.

[0033]

As described above, according to the present invention, when the image data is displayed in the pixel group arranged in the staggered structure, the irregularities due to the staggered structure arrangement are not conspicuous at the boundary portion of the image data. It has an excellent effect that it can be displayed.

[Brief description of drawings]

FIG. 1 is a diagram showing a photographic processing device to which an image display method according to an embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating an image display method according to an embodiment of the present invention using pixels on a matrix structure and on a staggered structure.

FIG. 3 is a flowchart showing a flow of an image display method according to an embodiment of the present invention.

[Explanation of symbols]

 10 Photo Processing Device 12 Image Reading Unit 14 Image Printing Unit 16 Image Signal Processing Unit 22 Negative Film 26 Filter 30 CCD Imaging Device 34 A / D Converter 40 Filter 44 Liquid Crystal Panel 48 D / A Converter 56 Printing Paper 66 Input Frame Memory 68 Image data processing unit 70 Character generation circuit 72 Output frame memory

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H04N 9/30 (72) Inventor Toshio Ito 798 Miyadai, Kaisei-cho, Ashigarakami-gun, Kanagawa Fuji Photo Film Co., Ltd. In the company

Claims (2)

[Claims] 1. An image display method for displaying digital image data on each pixel arranged in a staggered structure, wherein the image data is arranged in a matrix structure when the image data has boundaries with different hues. The image display method is characterized by displaying at least one of two kinds of hues of the boundary portion at an intermediate gradation level in pixels in a zigzag structure existing at a position displaced from the position in the X or Y direction. 2. An image display method for displaying digital image data represented by binary data of white or black on each pixel arranged in a staggered structure, wherein a boundary portion of the white or black image is formed, Displaying pixels in a zigzag structure existing at positions displaced in the X or Y direction from positions where the image data is arranged in a matrix structure with the white or black intermediate gray scale. Method.