JPS62123575A - Picture processing device - Google Patents

Abstract

PURPOSE:To find out the up-and-down of a picture when a variable density picture is overlapped and displayed by selecting one of plural picture data of the picture, and selecting one piece of picture element data based on the comparing output of the selected picture element data and the comparing data. CONSTITUTION:In picture elements A1 and A2, all data of an (n) bit are zero. For a selecting signal S4, one is commanded. In a selecting circuit 4-2, the data of the picture element A1 are selected and sent to a comparator 4-2. The comparator 4-2 compares the data and comparing data S3. Here, in the data S3, the (n) bit is all zero. Consequently, the comparator 4-2 detects the coincidence. In case of the coincidence, a deciding signal 0 is outputted to a selecting circuit 4-3. At the circuit 4-3, as the data to output finally, the data of the picture element A2 are selected and outputted. After the data are processed, the data come to be the data of the picture element A3. When the signal S4 is zero, the processing is executed in the same way. Thus, when the signal S4 is one, processing is executed so that a picture element S1 can come on the top and when the signal S4 is zero, the processing is executed so that a picture element S2 can come on the top.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image processing apparatus, and more particularly to an image processing apparatus capable of superimposing a plurality of grayscale images in an appropriate form.

[Problem with conventional technology 1 Conventionally, for example, as a method for synthesizing two grayscale images,
There is a method as shown in FIG. In Figure 2 (1), the contents of the memory storing the background screen and the memory storing the image to be superimposed on it are simply superimposed as a window screen W and displayed on the display section C. be. As you can see from the diagram, the background screen,
There is a problem that an area overlapping with the window screen W is not displayed.

In addition, Figure 2 (■) creates composite image data by performing logical operations on each pixel data of the contents of the memory that stores the background screen and the contents of the memory that stores both images to be superimposed on it. 3 is a diagram showing a state displayed on display section C.

With this method, if the image is a binary data image, it does not matter which image is on the top or the bottom, so there is no particular problem, but in the case of a grayscale image, it becomes a problem, so simply When image data is synthesized by performing logical operations, there is a drawback that in a portion where images are superimposed, as shown as P in FIG. 2 (2), it is not clear which image is on top.

[Object of the Invention] The present invention has been made based on the above points, and an object of the present invention is to provide an image processing device suitable for superimposing and displaying grayscale images. a first selection circuit that selects and outputs one pixel data from pixel data; a comparator that compares the n-bit pixel data selected by the first selection circuit with comparison data consisting of n bits; and the comparator. and a second selection circuit that selects and outputs one pixel data from the pixel data of the plurality of images based on the output from the image processing section.

Structure of the Invention FIG. 1 is a block diagram showing an example of an image processing apparatus according to the invention. 1 is a keyboard for various instructions and input;
Reference numeral 2 denotes a control section, and 3 a storage section storing image data, comparison data, etc. to be described later.The image data is composed of n bits per pixel.

4 is an image a processing unit that performs processing such as image composition, and 5 is D/△.
Converter 6 is a display section.

FIG. 3 is a circuit diagram of the image processing section 4.

4-1 is a selection circuit that selects and outputs pixel data to be sent to the inverter 4-2 (to be described later) out of the pixel data of the two input images, and 4-2 is a selection circuit that selects and outputs pixel data to be sent to the inverter 4-2 from among the pixel data of the two input images; This is a comparator that compares the received pixel data and outputs [11] when they do not match, and outputs "0" when they match.

4-3 is a selection circuit that selects and outputs pixel data to be output from the pixel data of the two input images based on the output from the comparator 4-2.

The pixel data Sl, Sz, the selection signal S4 and its inverted signal are connected to the selection circuits 4-1 and 4-3, and the comparison data S3 is connected to the comparator 4-2. Further, the output from the comparator 4-2 is connected to enter the selection circuit 4-3.

Here, the comparison data S3 is n-bit data, and normally all bits are "0". Also, select mail @S
4 is 1-pixel data that commands whether to raise Torara's image on top; when "1" is commanded, set Sl, and when "0" is commanded, set G2 pixel data on top. This is a command to do so.

FIG. 4 is a detailed circuit diagram of the selection circuit 4-1.

G1. Gz is an AND gate, and G3 is an OR gate.

FIG. 5 is a detailed circuit diagram of the selection circuit 4-3. G4 is EXOR gate, G5 G6 is AND gate, G7 is O
This is the R gate.

[Operation of the invention] Next, the operation of the present invention will be explained.

First, the user uses the keyboard 1 to designate images to be superimposed and to issue commands such as which image should be placed on top. Based on these instructions, the control section 2 sequentially reads out pixel data 81 and 32 of the two images to be superimposed from the storage section 3 and sends them to the image processing section 4 together with the comparison data S3.

Next, processing in the image processing section 4 will be explained. 6th
Figures (1) and (2) are diagrams of two image data to be superimposed, and are grayscale images consisting of n bits per pixel. The shaded area in the diagram indicates that at least one of the n bits is "1"
This is the image area of

■,Introduction, as shown in Figure 6 (1) and (2), the pixel At
.

The processing when the n-bit data of A2 is input to the image processing section 4 shown in FIG. 3 will be described.

In pixels At and Az, all n bits of data are "0". It is also assumed that the selection signal S4 is commanded to be "1". The selection circuit 4-1 selects the data of the pixel Δ1 and sends it to the comparator 4-2. The comparator 4-2 compares the data with comparison data S3. here,
The comparison data S3 has n-bit size and is rOJ. on the other hand,
Since all n bits of the pixel A1 are "0", the comparator 4-2 detects a match. If they match, the determination signal "0" is output to the selection circuit 4-3 as described above. The selection circuit 4-3 selects the data of pixel Δ2 in which all n bits are "0" as the data to be finally output.
Output. After processing, this data becomes the data of pixel A3 shown in FIG. 6(3).

01 Next, pixels Bl and B shown in FIG. 6 (1) and (2)
The second data processing will be explained.

Pixel B1 has at least one "1" bit, but pixel B2 has all "0" bits. The selection circuits 4-1 select the data of the pixel B1 and send it to the comparator 4-2. ] In the converter 4-2, the n of all "0" mentioned above is
The bit comparison data S3 and the data of the pixel B1 are compared. In this case, a mismatch is detected and a determination signal "1" is output to the selection circuit 4-3. The selection circuit 4-3 selects and outputs the data of pixel B1 as the data to be finally output. After processing, this data is displayed at pixel B shown in FIG. 6 (3).
The data will be 3.

05 Next, processing of the data of pixels C1, C2 in FIG. 6(1) i will be explained.

All n bits of pixel C1 are "0", and pixel C2 has data in which at least one bit is "1". The selection circuit 4-1 selects the data of the pixel C1 and sends it to the comparator 4-2.

The comparator 4-2 compares the comparison data S3 with the data of the pixel C1 by -16°. In this case, a match is detected and a determination signal [01 is outputted to the selection circuit 4-3.

In the selection circuit 4-3, the data of the pixel C2 is selected as the data to be finally outputted, and is output 9. After processing, this data becomes the data of the pixel C3, not shown in FIG. 6(3). .

00 Next, pixels DI and C2 shown in FIG. 6 (1) and (2)
The processing of data will be explained.

Both pixels DI and C2 have data in which at least one bit is "1". In the selection circuit 4-1, the pixel D1
data is selected and sent to the ] comparator 4-2. The comparator 4-2 compares the comparison data S3 with the data of the pixel D1. In this case, a mismatch is detected and the judgment signal is "1".
is output to the selection circuit 4-3. The selection circuit 4-3 selects and outputs the data of the pixel D1 as the data to be finally output. This data becomes the data of the pixel D3 shown in FIG. 6(3) in the processed image.

The above-described processing is performed in the image processing section 4.

The above example is an example where the selection signal S4 is "1", but
In the case of "0", processing is performed in the same manner. As can be seen from the explanation of (2), if the selection signal S4 is "1", the pixel S1.
When pixels in which at least one bit of S2 is "1" are superimposed, processing is performed so that pixel S1 is placed on top. Further, when the selection signal S4 is "0", the image S2 is processed so as to be placed on top.

The data processed in this manner is displayed on the display unit 6 after being subjected to D/Δ conversion by the D/Δ converter 5. Further, the data processed by the image processing section 4 may be stored in the storage section 3 again.

Although the above embodiment deals with the case where two images are superimposed, it is of course possible to implement the case where three or more images are superimposed.

[Effects of the Invention] As described in detail above, according to the present invention, the inconvenience of not being able to tell which image is on top when displaying grayscale images in a superimposed manner as in the past can be resolved. can. Not only that, but it also has the advantage of being able to arbitrarily select an image to be changed to -.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram of a conventional display example, FIG. 3 is a circuit diagram for processing in the image processing p1 section, and FIG. 4 is a selection circuit 4-1. FIG. 5 is a detailed circuit diagram of the selection circuit 4-3, and FIG. 6 is a diagram of the image data before and after being subjected to car tampering according to the present invention. 1...Keyboard 2...Control unit 3...Storage unit 4...Image processing unit 4-1.4-3...Selection circuit 4-2...Comparator 5...D/A Converter 6...Display section Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] A first selection circuit that selects and outputs one pixel data from pixel data of a plurality of images, and n-bit pixel data selected by the first selection circuit and comparison data consisting of n bits. and a second selection circuit that selects and outputs one pixel data from the pixel data of the plurality of images based on the output from the comparator. image processing device.