JPH02183327A - Display device - Google Patents

Abstract

PURPOSE:To display a histogram on the same screen without damaging the ability to easily observe an objective picture by providing an area on a bit map memory corresponding to a rectangle which is set in a prescribed position on the screen of a display part. CONSTITUTION:A normalizing means 3 normalizes first quantity based on the number of words in the length-wise direction of an area corresponding to the rectangle, which is set on the screen of a display part 2, and normalizes second quantity based on the number of bits constituting one word of a bit map memory 1. A storing means 4 stores the normalized second quantity to all the respective words in the width-wise direction of the same address as that of the length- wise direction in the area 11 corresponding to the first normalized quantity. Then, the second quantity is displayed on the display part 2 by luminance or color. Thus, since the histogram is displayed in the strip shape on the screen, an occupied area is reduced and a part overlapped on the objective picture is made minimum. Then, the histogram can be displayed out of the display area of the objective picture and the objective picture can be easily observed.

Description

[Detailed Description of the Invention] [Summary] Regarding a display device that displays a figure representing a relationship between two mutually related quantities together with an image, it is possible to display a histogram on the same screen without impairing the visibility of the target image. A device having a bitmap memory and displaying an image and a figure representing a relationship between first and second quantities related to each other on a display section, the device having a bitmap memory, an area on the bitmap memory corresponding to a rectangle set at a predetermined position on the screen of the display unit, the number of words in the long side direction of the rectangle of the area, and the number of words constituting one word of the bitmap memory]. means for normalizing the first and second quantities based on numbers; and means for normalizing the first and second quantities based on numbers; means for storing the normalized second quantity for every word, and the second quantity is displayed on the display section in brightness or color.

[Industrial application field]

The present invention relates to a display device that displays an image as well as a graphic representing a relationship between two mutually related quantities.

In recent years, in image processing devices, when the brightness of an area to be observed is concentrated in a certain range, a histogram of the brightness distribution of that image is displayed along with the image to be processed, and the range of brightness is expanded by referring to the histogram. In some cases, a method is used in which the luminance distribution is displayed as a histogram together with the target image, such as exaggerating the luminance difference (a type of gradation processing) to facilitate analysis of the target image. Therefore, a display device that displays two images, a target image and a histogram, in an easy-to-see manner is desired.

[Prior Art] In image processing, a histogram is used as a means to easily display the brightness distribution of a target image. A histogram display is usually displayed in the form of a line graph or bar graph, with the horizontal axis representing brightness (or density) and the vertical axis representing the frequency of appearance of the brightness. Since such a display format requires a certain amount of length on both the vertical and horizontal axes, it is displayed on the same screen by overlapping the target image or by deleting a part of the target image.

[Problem to be solved by the invention]

As mentioned above, according to the conventional method, the histogram of the brightness distribution of the target image is displayed in the form of a line graph or bar graph by overlaying it on the target image or by deleting a part of the target image.
There was a problem that the target image was difficult to see.

An object of the present invention is to provide a display device that displays a histogram on the same screen without impairing the visibility of a target image.

[Failure to solve the problem]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, in a device having a bitmap memory 1 and displaying an image and a figure representing the relationship between first and second quantities related to each other on a display section 2, 11 indicates a point on the screen of the display section 2. Bitmap memory 1 corresponding to the rectangle set at a predetermined position
In the upper area, 3 is a means for normalizing the first and second quantities based on the number of words in the long side direction of the rectangle of the area 11 and the number of bits constituting one word of the focus map memory 1, and 4 is a normalization means. This means stores the normalized second quantity in all words in the short side direction that have the same address in the long side direction of the area 11 corresponding to the normalized first quantity.

Therefore, the second amount is displayed on the display section 2 in brightness or color.

[Effect]

According to the present invention, the normalizing means 3 normalizes the first amount based on the number of words in the long side direction of the area 11 corresponding to the rectangle set on the screen of the display section 2, and the bitmap memory 1
The second quantity is normalized based on the number of focus points constituting one word of Since we store the normalized second quantity in every word, the second
The amount can be displayed on the display unit 2 by brightness or color.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. The same reference numerals indicate the same objects throughout the figures. Components in FIG. 2 that correspond to those in FIG. 1 are surrounded by dashed lines.

FIG. 2 is a block diagram showing an embodiment of the present invention applied to an image processing apparatus having a single color cathode ray tube display section (hereinafter referred to as CRT).

The image information writing unit 8a stores the luminance signal from the image generator 11Jt7a in the corresponding address of the image memo 1/m in synchronization with the X-ray scanning. The image memo inm is a bitmap memory in which each word corresponds one-to-one to the pixels of the CRT 2m, and for example, one word is composed of 8 bits. The image data in the image memory 1m is read out in synchronization with the display scanning of the CRT 2m, and a lookup table for image display (hereinafter referred to as
The luminance axis is converted by LUT) 6a, and the display control unit 5m
is input. The display control unit 5m outputs a luminance signal and a synchronization signal to the CRT 2m, and displays the contents of the image memo 1 month m as an image in a single color such as black and white.

Histogram area 1b is a 1 nm area of image memo corresponding to, for example, a rectangle (histogram display area) provided at the bottom of the screen of CRT 2m (for the sake of simplicity, one word in the vertical axis direction and a relative address in the horizontal axis direction). 256 of 0-255
correspond to the word domain. In reality, the vertical width of the memory area is taken by the number of pixels corresponding to the vertical width of the histodaram. )
It is.

The normalization unit 3a sets the magnitude of the luminance signal from the image generation source 7a to 256 (corresponding to 256 words in the histogram area 1b).
The brightness value (the first amount) when displaying the histogram by quantizing it into equally spaced intervals is calculated, and the number of brightness signals is totaled in pixel units for the brightness value, and the total value is set from 0 to 2.
55 (corresponding to 8 bits/word of 1 m of image memory), and the frequency of appearance (the second quantity) is determined.

The brightness information writing unit 4a stores the frequency of appearance in each word at relative addresses 0 to 255 in the histogram area 1b corresponding to the brightness value determined by the normalization unit 3a (see FIG. 2(b)).
)reference).

LU76m has 256 words, 8 bits/word, whose contents do not change through gradation processing, unlike LUT 6a, whose contents change through gradation processing that expands or reduces the brightness difference in the target area to facilitate image inspection. This is a histogram LUT. When the image memory 1m is read out in synchronization with display scanning, the histogram area 1b is switched to the LUT 6m, so that the frequency of appearance of the histogram is displayed correctly in brightness by shading.

Accordingly, the CRT 2m is configured to display the frequency of appearance in 256 gradation levels for the 256 levels of brightness values expressed horizontally on the CRT 2m.

Similarly, a histogram area of 8 x 256 words and 3
If we set up a LUT of 2 words and 4-pips 1-7 words, and normalize the brightness values and appearance frequencies to the ranges of 0 to 31 and O to 15, respectively, we will have 16 levels of appearance frequency for 32 brightness values. Length and width 8
A histogram is displayed as shading stripes in a block of ×8 pixels.

It is also possible to display the brightness continuously by omitting the LUT 6m and inputting the readout output of the histogram area 1b directly to the display control unit 5m and directly specifying the brightness without conversion using the LUT. It is.

FIG. 3 is a block diagram showing another embodiment of the present invention, and shows an example in which the appearance frequency of His 1 to Gram is displayed in color on a color display device. Red (R) on color display devices
, three sets of image memos corresponding to green (G) and blue (B) January C
, an image display LUT (not shown), and a display control section 5c corresponding to one color. Therefore, three sets of histogram LUTs 6c are also provided. Image memo January C is R, G
, B are both composed of 8 bits/word, and L for histogram.
The UT6c is composed of 256 words for R, G, and B, and 8 pips 1~/word. By setting the values shown in Figure (b) for each word in the LUT 6c, the frequency of appearance can be expressed using eight different colors. Dividing the contents of LUT6c further into O~
By setting a value between 255, a variety of color expressions are possible.

Furthermore, by setting the same values for R, G, and B of the LUT 6c and inputting the same appearance frequency data, it is possible to display the histodaram in a single color even on a color display device.

〔Effect of the invention〕

As explained above, according to the present invention, since the histogram is displayed in the form of a strip on the screen, the area occupied by the histogram can be reduced to minimize the portion overlapping the target image, and it can also be displayed outside the display area of the target image. This has the effect of making it easier to observe the target image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the invention, FIG. 2 is a block diagram showing an embodiment of the invention, and FIG. 3 is a block diagram showing another embodiment of the invention. In the figure, 1 is bitmap memory, 1m, lc is image memory, 11 is area, 1b is histogram area,
2 is a display section, 2m and 2c are CRTs. 3 is a normalization means; 3a is a normalization section; 4 is a storage means; 4a is a brightness information writing section; 5m and 5c are display control sections; 6a, 6m and 6c are LUTs. 7a represents an image generation source, and 8a represents an image information writing section. ■

Claims (1)

[Scope of Claims] A device having a bitmap memory (1) and displaying an image and a graphic representing a relationship between first and second quantities related to each other on a display section (2), comprising: an area (11) on the bitmap memory (1) corresponding to a rectangle set at a predetermined position on the screen of the display unit (2); the number of words in the long side direction of the rectangle in the area (11); means (3) for normalizing the first and second quantities, respectively, based on the number of bits constituting one word of the bitmap memory (11); means (4) for storing the normalized second quantity in all of the words in the short side direction that have the same address in the long side direction of the area (11); A display device characterized by displaying information in brightness or color on a display unit (2).