DD256154A1 - PROCESS AND CIRCUIT ARRANGEMENT FOR PATTERN PREPARATION - Google Patents

Abstract

Method and circuit arrangement for sample preparation for colored textile surface structures, wherein the image acquisition takes place via a video camera and the further processing of the image data in the pattern preparation is computer-aided taking into account a monitor for visual inspection. A color classification memory is placed in front of a frame buffer, with an additional memory for each color coding and its intensity value being connected downstream of it. The control takes place via a logical circuit arrangement and a microprocessor. The storage in the image repositories takes place in accordance with an assignment fixed by the content of the color classification memory, which before the image acquisition by the microprocessor is calculated from the intensity values of the color signals of the monitor specified for each color coding in the intensity value memory according to a classification mode and written into the color classification memory. Fig. 2

Description

For this 4 pages drawings

Field of application of the invention

The invention relates to a method and a circuit arrangement for pattern preparation for colored textile fabrics, wherein the image acquisition takes place via a video camera and the further processing of the image data in the pattern preparation computer-aided taking into account a monitor for visual inspection.

Characteristic of the known state of the art

In DE-OS 3342004 an apparatus for inputting video signals to a digital memory is described, in which the video coming from the camera video signal is converted by means of suitable commands from a control unit by A / D converter into digital data and written to a video memory.

During this process, the CPU BUS is powered off memory and the addresses are provided by an address counter. In devices of this type is a realistic as possible reproduction of the original image by the digitized video image, d. H. lowest possible loss of information during digitization.

However, this means that expensive and component-consuming memory arrangements must be used. This is especially true when working under real-time conditions and because of the high speed requirements static RAM circuits are needed.

DE-AS 2214787 describes a method and a device for transmitting the information content of a multicolor pattern drawing for textile machines into a controller memory. Here, a template is still largely input via mechanically moving sensors.

This method is significantly expanded in DE-AS 2458927, which describes an arrangement for transferring a pattern. Here, the original is first taken from a video camera pattern information whose colors and contours are displayed on a screen, the image field is raster and visibly decomposed into a predetermined number of pixels and step by step for each of these pixels of the associated color value is determined. The

color-capable video camera provides signals for the three color channels red, green and blue. This information is temporarily stored on a magnetic disk (video memory). From there, the analog signals of the three color channels are fed to a code converter. The code converter contains nine voltage comparators with different voltage levels that can be set by the operator. The signals at the outputs of the voltage comparators are digitized and output via a tape punch on a perforated tape. At the same time, the encoded signals of the converter are reassembled and displayed on a color monitor after D / A conversion. The picture can be disassembled in a maximum of six colors. The fact that here the storage and color coding is performed with analog signals, you need a complex video technology. The computer used is not involved in the treatment of color information. Furthermore, the pattern output is possible only on a perforated tape.

Object of the invention

The aim of the invention is to provide a method for pattern preparation, in which the video signals are reduced so that memory requirement is saved and at the same time a necessary restriction to a few colors, which are freely selectable, is realized. To carry out the method, a circuit arrangement is to be designed.

Explanation of the essence of the invention

The invention has for its object to capture a colored template for textile patterns using a video camera to classify under real-time conditions in a maximum of 16 colors (4 bit / pixel) and store it in a memory from which the resulting image is displayed on a color monitor or can be further processed. According to the invention we solved the problem as shown in the characterizing part of the claims. The essence of the invention lies in the fact that the coming of the video camera digitized color signals are applied as addresses to a memory, in which there is a 4-bit color codeword on each memory location, which was determined as follows:

The user-defined selection colors into which the template is to be classified can be represented by dots in a space spanned by the intensities red, green and blue. The digitized color signals whose red, green and blue components are known can also be represented in this color space. According to a suitable algorithm, the smallest distance of the color signal to be examined to one of the selected color points is determined for all theoretically possible color signals that can come from the video camera. The corresponding color code is entered in the color signal corresponding address, d. H. instead of the actual color signal, only the color code is entered into the image memory for each viewpoint. It should also be noted that in each case the color codes of four consecutive pixels are combined into one word and only then written into the image memory. The advantage of the invention lies in the achieved time conditions, which allow the use of dynamic RAM circuits, which have longer access times, but due to their higher integration density are economically cheaper to use.

embodiment

The invention will be explained below with reference to an embodiment. In the accompanying drawing shows

1: an overview representation, FIG. 2: the assignment of the memories to the microprocessor, FIG. 3: a spatial representation for the color information, FIG. 4: a block diagram of the circuit arrangement, FIG. 5: algorithm for distance detection.

In Fig. 1 an overview representation is shown, with the help of the classification of the proposed solution is to be made in their field of application.

A pattern preparation plant 5 is i.a. used for designing jacquard patterns in the textile industry. The stored in the image memory 2 pattern is written under control of a microprocessor 1 in the main memory 3 of the pattern preparation system and from there, for example, on a floppy disk 4. The data stored on the diskette 4 data by means of a drive 6 of the control unit? the textile machine 11 read. From there they get into the main memory 8 of the machine. These data are then used by the microprocessor 9 to control the jacquard device 10.

In Fig. 2, the assignment of the memory to the microprocessor in the pattern preparation system is shown.

The microprocessor 1 interacts with the image memory 2 and the main memory 3. It also controls a Farbklassifikationsspeicher 14 and an intensity value memory 15. From the video camera 12, the signals pass through an A / D converter 13 to the color classification memory 14, whose output to the frame buffer 2 is switched, wherein the image memory 2 is connected via the intensity value memory 15 to a D / A converter 16 which supplies the analog signals for the monitor 17.

The workflow provides that the coming of the video camera 12 signals of the three color channels red, green and blue are digitized via the A / D converter 13 and applied to the address inputs of the Farbklassifikationsspeichers 14. The individual color information is assigned fixed bit positions. By suitable software, the memory cells are loaded in the initialization phase before the color classification so that each color information / pixel (9 bits) is assigned a specific color code (4 bits). This color code is now entered in the image memory 2 instead of the actual digital color signal.

When assigning the color codes to the incoming color information, the operator must first select the colors into which the image is to be classified. This can be done, for example, by selecting from given color bars or by mixing the intensities of the individual color channels in the intensity value memory 15 to the desired color.

These colors can be represented by points in a space spanned by the coordinates, intensity red, green, blue (see Fig. 3).

For all theoretically possible color combinations, which can come from the A / D wall I em 13, and which can also be represented by dots in the color space, the distances to the selection color points are now determined. The color code of the selection point which is closest to the color combination currently being tested is entered in the image memory location with the address corresponding to this color combination.

The color space in which the color information can lie can, as shown in FIG. 3, be delimited by the areas of a cube.

The dimensions mean

A = maximum red intensity

B = maximum green intensity

C = maximum blue intensity.

If all intensity values have their maximum value, point D, this corresponds to the color white. If all values are zero, point E, you get the color black.

For any color combination that may come from the A / D converter 13, i. from red = 000, green = 000, blue = 000, to red = 111, green = 111 and blue = 111, the distance to the selection points must now be determined. If A, B, C, D, and E are operator-desired select colors to which he has assigned color codes 01,02,03,04 and 05, e.g. For example, the treatment of the combination 101000000 with red 101 = xi, green 000 = yi and blue 000 = ziden point F, which corresponds to a dark red, wherein in the memory cell with the address 101000000 of the Farbklassifikationsspeichers 14, the value 01 is entered. (For the values xi, yi and zi see also explanation to Fig. 5).

For equal distances of a comparison value of two or more selection points, the value determined first is used. By varying the intensity values of the selection colors, the operator can counteract this problem. The points shown in Fig. 3 have been placed on the corners and edges of the cube for ease of illustration, of course, they may also occupy positions within the cube.

4, the block diagram of the circuit arrangement is shown.

The video camera 12, which is synchronized by a controller 27 via a clock line 30, supplies the analog video signals of the three color channels red, green and blue when scanning a document with any desired number of color shades. These signals are applied to the A / D converters 13, which provide a 3-bit digital value for each color channel.

Here is a first data reduction, since it can be classified with the resulting 9-bit information in a maximum of 512 colors. These data lines reach bus driver 18. If no data is expected from the video camera 12, the controller 27 ensures that the outputs of the bus drivers are in the high-impedance state and thus do not interfere with the data transfer between the microprocessor 1 and the color classification memory 14. If the image data is to be written into the image memory 2, the information via the associated bus driver to the address inputs of the Farbklassifikationsspeichers 14. This is designed as a fast static RAM with 512 χ 4 bits.

The address assignment is as follows:

Address bit 0 ... 2 Color channel Blue Bit 0 ... 2.

Address bit 3 ... 5 Color channel Green BitO ... 2

Address bit 6 ... 8 Color channel Red Bit 0 ... 2

With a suitable occupancy of the memory cells, which will be explained later, one achieves a defined assignment of 4-bit color codes to the 512 possible colors. About a combination of shift registers 19 and latches 20, the information of 4 pixels are summarized and written via bus driver 21 as a 16-bit word in the image memory 2. The addresses are provided by an address counter 22.

Due to the fact that memory access is only necessary for all 4 pixel clocks, dynamic RAM circuits can also be used for the image memory 2.

During the driving in of the camera data, the address and data bus 28, 29 of the microprocessor 1 are switched off from the picture memory 2 via associated bus drivers. As an example, a memory structure of 64Kx 16 bit is used, which allows the storage of a maximum of 512 = 512 pixels each with 4 bits.

The representation of the content of the image memory 2 on the color monitor 17 is done as follows:

The address counter 22 provides the required addresses of the 16-bit data words and thus realizes a constant reading of the frame buffer 2. A second arrangement of latches 23 and shift registers 24 splits this information into 4 × 4 bit values corresponding to the color codes of 4 consecutive pixels correspond. These color codes are applied via a multiplexer 26 as addresses to the intensity value memory 15 divided into three channels. The intensity value memory 15 is realized by means of fast static RAMs having a structure of 16 × 8 bits each. This memory 15 can be loaded from the microprocessor with intensity values ron 0 ... 255 for each color channel red, green, blue. The 16 color codes can thus be assigned colors from a palette of about 16 million color shades. The digital intensity values for the three color channels are converted into analog values by the D / A converters 16 and supplied to the monitor 17. The monitor 17 receives its synchronization signal via the clock line 30 from the controller 27. Via one of the bus drivers, the digitized camera data can be applied directly to the D / A converter 16, with the highest-order 3 bits in each case being occupied. This facilitates the subject selection and the adjustment of the original. The microprocessor 1 has access via the address bus 28 and the data bus 29 to the described memory 14,2 and 15 and can write data and read in the image memory 2 also. About the associated bus driver 18 and the multiplexer 26, the controller 27 ensures that only the video camera or the microprocessor 1 can access one of these memory 14,2,15.

In order to perform a defined color classification, it is necessary to properly load the color classification memory 14.

-4- ZOO ΙΟ **

First, the operator is required to select the colors into which he wishes to have the template classified. The setting of the colors can be done by selecting from given color bars or by mixing the intensities, loading the intensity value 15, the individual color channels to the desired hue. A computer program, the flow chart of which is shown in Figure 5, establishes the association between the 512 possible values that may come from the video camera and the colors selected by the operator. Each of these colors is, as indicated in Figure 3, represented by a point in a color space with the coordinates intensity red, green and blue. The program determines the distance to the selected color points from each of the possible values to which points in the color space can also be assigned. The color code of the selection color point closest to the color point being tested is entered into the memory location with the address of the value being tested.

The coordinates xi, yi and zi correspond to the intensity values of the three channels of the selected colors. The values are consecutively in the main memory 3 and are addressed via an index register IX of the microprocessor 1. The coordinates xj, yj and zj correspond to the test values between 0 and 511, which are divided by the program into the top three bits of three memory locations. The remaining bits of these memory cells are set to zero. The addressing takes place via the index register IY. The subtraction takes place in the working register A and the squaring in the double register HL, wherein the value of χ is subsequently made in the double register DE and the value of y in the double register BC. If the z-value is determined, the contents of the registers BC and DE are added to the register HL.

Claims (3)

1. A method for pattern preparation for colored fabrics, in which the image is captured by a video camera scanning a template and generates three color signals, and the further processing of the image data in the pattern preparation computer-aided incorporating a monitor for visual control, wherein the image data on A / D converter are led to a memory, characterized by the temporal succession of the following method steps: a) that in a color classification memory (14) a 9-bit digital color information is applied as an address, b) that four bit color codes are read from this memory (14), c) wherein the color codings for a plurality of pixels in shift registers (19) and latches (20) combined and taken over at a slower clock than the pixel clock in parallel in a pixel memory (2) d) and that in a downstream intensity value memory (15), the conversion of the color codes into intensity values for the three color channels takes place. 2. The method according to claim 1, characterized in that the color code of the selection point, which is closest to the color combination currently being tested in the memory location with the address corresponding to this color combination is entered, wherein the color coding is determined by a comparison operation whose intensity value in the memory (15) has the smallest distance to the respective color signal. 3. Circuit arrangement for pattern preparation, characterized in that the outputs of the A / D converter (13) are connected to a color classification memory (14) and via D / A converter (16) on the monitor (17) that the Farbklassifikationsspeicher (14) via associated bus drivers (18) control signals of the microprocessor (1) are guided and the outputs of the color classification memory (14) via shift registers (19) and latches (20) to the image memory (2) are connected to the address and Data bus (28, 29) of the microprocessor (1) is connected and that the outputs of the image memory (2) via further latches (23) and shift registers (24) are connected to an intensity value memory (15) whose outputs are also on the D / A Converters (16) are guided.