JP3183952B2 - Judgment waveform compressed data creation and holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a judgment waveform compression data generating and holding device for judging a waveform in various inspection apparatuses and the like.

[0002]

2. Description of the Related Art Conventionally, when inspecting the operation state of components or a circuit network mounted on a printed circuit board, storage oscilloscopes,
Using a memory recorder, an in-circuit tester, etc., apply signals such as voltage and current to those parts and the circuit network, obtain measurement waveform data, and compare it with the previously created judgment waveform data. Judge the results. Usually, such inspection devices are provided with a microcomputer or the like, and when data is stored in a V-RAM under the control of the CPU, the data can be displayed on a screen such as a CRT of a display device. Therefore, in order to create the judgment waveform data, a user operates a key or the like in the operation section to display an arbitrary judgment waveform on the screen, and stores the judgment waveform data corresponding to the screen image in the V-RAM.

Therefore, the determination waveform data stored in the V-RAM is stored and held in another storage device without compression. At this time, if the size of the display screen is X pixels in the horizontal direction and Y pixels in the vertical direction as shown in FIG. 18, one bit of the V-RAM corresponds to one pixel indicated by diagonal lines on the display screen. In this case, X × Y bits are required as a storage capacity for holding the determination waveform data.

[0004]

If the determination waveform data is held as it is in this way, a storage capacity of N × X × Y bits is required if the number of determination waveforms is N. Therefore, as N increases, the storage capacity also increases,
There is a problem that a large amount of storage capacity must be provided.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and converts compressed determination waveform data to create compressed compressed determination waveform data that can be held with a small storage capacity.
An object is to provide a holding device.

[0006]

In order to achieve the above-mentioned object, in the apparatus for generating and holding compressed compressed waveform data according to the present invention, as shown in FIG. Uncompressed size calculating means 30 for calculating the size of the storage capacity required to store the judgment waveform data stored in
For each column of the pixel matrix of the display screen that displays the determination waveform data stored in the V-RAM 18, the colors of the pixels are sequentially examined in the row direction, and the number of times the color changes and the number of pixels until the color changes are determined. And a compressed data creating means 32 for creating compressed data from the determined waveform data for all columns.

In the middle stage, a comparison is made between the size of the storage capacity required for storing the determined waveform data without compression and the size of the storage capacity required for storing the compressed data created from the determined waveform data. At the time of non-compression, a compression size comparison means 34 is provided, and at the subsequent stage, when the compression size is equal to or less than the non-compression size, the compression data is determined as determination waveform data, and a determination waveform data determination means 36 is provided. .

Further, as shown in FIG. 2, the same unit as the compressed data creating means 32 is provided in the preceding stage, and it is determined in the middle stage whether the number of color changes examined for each column is 2 or less for all columns. After the recompression possibility determining means 38 for judging the possibility of recompression is provided, if it is determined in the subsequent stage that the number is 2 or less for all the columns, until the color obtained for each column changes. A recompressed data generating means 40 for generating recompressed data from compressed data for all columns by limiting data indicating the number of pixels from the beginning to at most two times, and a recompressed data holding the recompressed data Data holding means 42.

[0009]

With the configuration as described above, the uncompressed size calculating means 30 calculates the storage capacity required for storing the judgment waveform data stored in the V-RAM 18 without compression. Further, the compressed data creating means 32 creates compressed data from the determination waveform data stored in the V-RAM 18.

At the time of non-compression, the storage capacity required for storing the judgment waveform data without compression by the compression size comparison means 34 and the storage capacity necessary for storing the compressed data created from the judgment waveform data. Compare. Then, when the compression size is equal to or less than the non-compression size, the determination data is determined by the determination waveform data determination means 36 as determination waveform data and held.

The compressed data creating means 32 uses a V-RAM
After the compressed data is created from the determination waveform data stored in 18, it is determined whether the number of color changes examined for each column by the recompression possibility determination unit 38 is 2 or less for all columns. When the recompressed data creation unit 40 determines that the number is 2 or less for all columns, recompressed data is created from the compressed data for all columns, and is stored in the holding unit 42.
Hold with.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 3 is a block diagram showing a configuration of a determination waveform compressed data creation / holding device including a microcomputer such as an in-circuit tester to which the present invention is applied. In the figure, 10 is an operation unit, 12 is a microcomputer, 14
Is an input / output unit, 16 is a display device, and 18 is its V-RAM. The operation unit 10 includes a keyboard, various switches,
A mouse and the like are provided. Therefore, when the inspector appropriately operates the keys and the like, the determination waveform and the like can be displayed on the screen of the display device 16.

The microcomputer 12 includes a CPU (central processing unit) 20, a ROM (read only memory) 22,
AM (read / write memory) 24, input / output port 2
6, a bus line 28 and the like. The CPU 20 corresponds to the brain of the computer 12, executes control of the whole according to instructions of a program, performs arithmetic and logical operations, and temporarily stores the results. Also, control is appropriately performed on peripheral devices. The ROM 22 stores a control program and the like for controlling the whole.

The RAM 24 stores measurement waveform data input from the outside, data calculated by the CPU 20, various data such as determination waveform data, and a determination waveform compression data creation and holding processing program input from a floppy disk or the like. The input / output port 26 includes various devices provided in the operation unit 10 and the input / output unit 14, the display device 16, and the V-RAM.
18 and so on. The bus line 28 includes an address bus line, a data bus line, a control bus line, and the like for connecting them, and is appropriately connected to a peripheral device.

The input / output unit 14 includes various devices such as a measuring device and a floppy disk. Then, the display device 16
Has a screen such as a CRT and has a V-RAM (video ram) 18. Therefore, when inspecting a printed circuit board or the like, it is possible to display the determination waveform on the screen first and display the measured waveform to compare the two to determine the quality of the board or the like.

Next, the operation of this embodiment will be described. FIG. 4 is a flowchart including the steps P1 to P8 showing the operation of the determination waveform compressed data creation and holding processing program. When a determination waveform is created while operating a key or the like in the operation unit 10 and viewing the screen of the display device 16, determination waveform data can be stored in the V-RAM 18.

Therefore, processing by the program is started. First, at P1, the size of the storage capacity for storing the one-pattern determination waveform data stored in the V-RAM 18 without any compression is calculated from the number of pixels of the display screen of the display device 16. At that time, the column direction (horizontal direction) of the display screen,
If the size in the row direction (vertical direction) is X pixel and Y pixel, respectively, one pixel corresponds to one bit. Therefore, the storage capacity required to store and hold one display screen, that is, one determination waveform is X × It becomes Y bits. For example, X =
X on a display screen with 400 pixels and Y = 200 pixels
× Y = 400 × 200 = 80000 bits. Next, go to P2.

In P2, the judgment waveform data is compressed to create compressed data. FIGS. 5 and 6 show in detail the operation of the judgment waveform compressed data creation processing program.
0, FIG. 7 shows V-RA
It is the figure which showed M18 by arrangement. One element of the array is composed of 8 bits and has data of 8 pixels. First, i, j, k, and l are set to 0 in P21. These i, j, k, l are variables indicating the subscript of the array.
In P22, n is set to 7. This n is a variable representing the n-th bit of one element of the array. In the programming language of this embodiment, the seventh bit is the first bit of one element of the array. Therefore, if one element of the array consists of 8 bits, n is changed from 7 to 0. In P23, m is set to i. Incidentally, i is 0. In P24, chg-count is cleared to 0. This chg-count is a variable indicating the number of times the color has changed. In P25, pix-co
Clear unt to 0. The pix-count is a variable indicating the number of pixels until the color changes. After completing the initialization in this way, the process goes to P26.

At P26, the color of the n-th pixel of the V-RAM [m] is checked. This V-RAM [m] is
This is a variable indicating the arrangement of the RAM 18. In P27, it is determined whether the color is the same as that of the pixel examined previously. Note that initially, for example, white is compared. If YES, go to P28. In P28, pix-count is increased by one. In P29, the width is added to m. This width is pixel information in the horizontal direction of the display screen.
8 = 50 variables indicating the array.

If P27 is NO, the program goes to P30. In P30, pix-count is stored in B [l]. B [l] is a variable indicating an array for storing the number of pixels. In P31, 1 is increased by one. In P32, p
ix-count is set to 1. In P33, chg-co
Increase unt by 1. Next, go to P29. In P34, i
Determines if all rows in a column have been examined. In the case of NO, the process returns to P26. In this manner, Y is sequentially applied to one column in the row direction.
Check the pixel color for each pixel, and if the color has changed, count up chg-count and pix-c
The process of storing “out” in the B array and counting up pix-count if the color has not changed is repeatedly performed.

When YES is determined in P34, P35
Go to In P35, chg-count is stored in A [k]. A [k] is an array for storing the number of times the color has changed. A part of the RAM 24 is used as a storage area for the A array and the B array. Pix-count on B [l] at P36
Store t. At P37, k is increased by 1 and l is increased by 1. At P38, it is determined whether all the columns have been checked. If NO, subtract 1 from n. In P40, it is determined whether n is -1. If NO, the process returns to P23, and the color of the pixel is similarly examined for the next column in the element group forming the eight pixel columns. If YES, the process returns to P22, and the color of the pixel is similarly examined for the first column in the element group forming the next eight pixel columns. When all the columns corresponding to X pixels are checked in this way, YES is determined in P38, and the creation of the determination waveform compressed data is terminated. At this time, the chg-count value of each column is stored in one element of the A array, and the pix-count value of each column is stored in the chg of the B array.
It is stored in each element of the number obtained by adding 1 to the -count value.

Next, go to P3. In P3, it is determined whether the compressed data can be recompressed. FIG. 8 is a flowchart including the steps P31 to P34 showing the operation of the recompression possibility determination processing program in detail. First, i is set to 0 in P31. In P32, it is determined whether A [i] is 2 or less. Note that A
If [i] = 0, it is not compressed, so it is not subject to recompression. If YES, go to P33. P3
At 3, i is increased by one. At P34, it is determined whether the entire A sequence has been checked. In the case of NO, the process returns to P32. However, if the content of each element of the A array is at least 3 or more, N in P32
It is determined as O and cannot be recompressed. In that case, go to P4. If YES is determined in P34, the process proceeds to P5.

At P5, recompressed data creation processing is performed. FIG. 9 is a flowchart including steps P51 to P57 showing the operation of the recompressed data creation processing program in detail. First, i, j, and k are set to 0 in P51. In P52, B [j] is stored in C [k]. P53
Then, k is increased by one. In P54, C [k] is changed to B [j +
1] is stored. Then, the elements of the B array can be transferred to the elements of the C array, and the next element of the B array can be transferred to the next element of the C array. At P55, A [i] +1 is added to j.
Then, A [i] +1 represents the number of elements of the B array required to represent the determination waveform of the column examined at the time of compression, so the subscript of the B array corresponds to the next element of A [i] of the A array. It can be determined to indicate the first element of the B array.

In P56, i is increased by 1 and k is increased by 1. Then, the subscripts of the A array and the C array are changed to indicate the next element, respectively. In P57, it is determined whether the end of the A array has been reached. If NO, the program returns to P52. In this manner, until YES is determined in P57, the data indicating the number of pixels until the color obtained for each column changes is limited to the number of pixels from the beginning to the maximum of two times for all columns and recompressed. Create data. If an attempt is made to create data equivalent to the recompressed data from the beginning, if it is not possible, the compressed data must be created from the beginning and time is wasted. YES at P57
If it is determined, go to P6.

At P4, the size of the storage capacity necessary for storing the judgment waveform data as it is without compression is compared with the size of the storage capacity necessary for storing the compressed data created from the judgment waveform data. At this time, if the determination waveform displayed on the screen of the display device 16 is, for example, as shown in FIG. 10, the compressed data created from the determination waveform data is as shown in FIG. Therefore, the storage capacity required to store the judgment waveform data without compression is 20 ×
12 = 240 pixels = 240 bits. Therefore,
If one byte = 8 bits is converted into a byte using a byte as a basic unit, 240/8 = 30 bytes.

The size of the storage capacity required to store the compressed data is the size of the A array + the size of the B array = 20.
+ 100 = 120 bytes. Note that the size of one element of the array is 1 byte. As a result, in P4, it is determined that the size of the storage capacity at the time of compression is larger than the size of the storage capacity at the time of no compression, and the process goes to P6. As a result, even if the compressed data is created at P2, the size of the storage capacity required for storing the compressed data is larger than that of the uncompressed data, so that there is no effect of holding the compressed data, and the compression becomes unnecessary.

Therefore, in P6, the judgment waveform data stored in the V-RAM 18 is transferred as it is without compression.
24 and stored in another part. FIG. 12 shows the details of the operation of the judgment waveform data transfer processing program.
It is a flowchart which consists of steps of 61-P64. First, i and k are set to 0 in P61 to initialize. These i and k are variables indicating the subscript of the array. V at P62
-Transfer RAM [k] to MEM [i]. This MEM
[I] is an array name indicating a part of the RAM 24 storing the judgment waveform data, and V-RAM [k] is an array name indicating the V-RAM 18 storing the judgment waveform data. P6
In step 8, i is incremented by 1 and k is incremented by 1 to determine the next transfer source and transfer destination. In P64, it is determined whether all the contents of the V-RAM [k] have been transferred. In the case of NO, the process returns to P62 and the transfer is repeated. If YES, the process ends.

When comparing the size in the uncompressed state with the size in the compressed state in P4, if the judgment waveform displayed on the screen of the display device 16 is, for example, as shown in FIG. × Y = 400 × 200 = 80000 bits, and converted to bytes, 80000/8 = 10000
It becomes bytes. Since the storage capacity at the time of compression is the size of the A array + the size of the B array, 400 + 2000 = 24
00 bytes. Therefore, the size is smaller when compressed, so the process goes to P7. At P7, the contents of array A and array B (data stored in each element) are transferred to RAM
24 is stored and held.

When it is determined at P3 whether recompression is possible, if the determination waveform displayed on the screen of the display device 16 is, for example, as shown in FIG. 14, the compressed data is recompressed as shown in FIG. The data is as shown in FIG. in this case,
The storage capacity required to store the judgment waveform data as it is without compression is 20 × 12/8 = 30 bytes, whereas the storage capacity required to store the compressed data is 20 + 60 = 80. And the size of the storage capacity required to store the recompressed data is 20 × 2 = 4
It becomes 0 bytes. Therefore, compression and recompression of the determination waveform data are meaningless.

However, actually, the number of pixels in the column direction and the row direction of the screen displaying the judgment waveform is much larger, and the judgment waveform is drawn there, for example, in a size as shown in FIG. Therefore, the size of the storage capacity required to store the judgment waveform data as it is without compression is 400 × 200/8 =
While it is 10,000 bytes, the storage capacity required to store the compressed data is 400 + 400 × 3 =
1600 bytes, the storage capacity is smaller when the determination waveform data is compressed and held. In addition, since the number of times the colors of all columns change is 2 or less, recompression is possible. Therefore, the size of the storage capacity required to store the recompressed data is 400 × 2 = 800 bytes, and the required storage capacity can be further reduced.

For this reason, usually, compression of the judgment waveform data,
Further, when recompression is performed, the determination waveform data can be held with a smaller storage capacity than when no compression is performed. In other words, when the same number of determination waveforms is stored without compression and when the required storage capacity when storing after compression and recompression is compared, the latter is smaller and holds more determination waveform data. it can. When comparing with waveform data measured using such determination waveform data, a method of creating and comparing original determination waveform data from compressed data or recompressed data, and a method of comparing compressed data or recompressed data as they are There is. At this time, if the black area displayed on the screen is regarded as an effective area, if the measured waveform data is entirely within it, the inspection result will be "good" even if they do not completely match.
May be determined.

[0032]

According to the present invention described above, claim 1
According to the described invention, for each pixel matrix of the display screen displaying the determination waveform data stored in the V-RAM, the color of the pixel is sequentially examined in the row direction, and the number of times the color changes and the number of pixels until the color changes Are determined, and compressed data is created from the determination waveform data for all columns, and it is determined whether the number of color changes examined for each column is 2 or less for all columns to determine the possibility of recompression. When it is determined that the number of pixels is equal to or less than 2 for all the columns, the data indicating the number of pixels until the color obtained for each column is changed is limited to the number of pixels from the beginning to at most two columns. In order to generate the recompressed data from the compressed data and hold the recompressed data, the storage capacity required to hold the judgment waveform data is even smaller than in the case of compression, and more judgment waveforms Can hold data.

[0033]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a determination waveform compressed data creation and holding device according to the present invention.

FIG. 2 is a block diagram showing a configuration of another determination waveform compressed data creation and holding device according to the present invention.

FIG. 3 is a block diagram illustrating a configuration of a determination waveform compressed data generation and holding device including a microcomputer such as an in-circuit tester to which the present invention is applied.

FIG. 4 is a flowchart showing the operation of a determination waveform compressed data creation / holding processing program stored in a RAM of the microcomputer.

FIG. 5 is a flowchart showing in detail a part of the operation of the determination waveform compressed data creation processing program in the determination waveform compressed data creation and holding processing program.

FIG. 6 is a flowchart showing in detail the remaining part of the operation of the determination waveform compressed data creation processing program.

FIG. 7 is a diagram showing an array of V-RAMs of a display device provided in the in-circuit tester and the like.

FIG. 8 is a flowchart showing in detail the operation of a recompression possibility determination processing program in the determination waveform compressed data creation and holding processing program.

FIG. 9 is a flowchart showing in detail the operation of the recompressed data creation processing program in the determination waveform compressed data creation and holding processing program.

FIG. 10 is a diagram showing an example in which compressed data of a judgment waveform displayed on the screen of the display device can be formally formed.

FIG. 11 is a diagram showing compressed data created from the determination waveform data.

FIG. 12 is a flowchart showing in detail the operation of a determination waveform data transfer processing program in the determination waveform compressed data creation and holding processing program.

FIG. 13 is a diagram showing an example in which compressed data of a judgment waveform displayed on the screen of the display device can be substantially created.

FIG. 14 is a diagram showing an example in which recompressed data of a judgment waveform displayed on the screen of the display device can be formally formed.

FIG. 15 is a diagram showing compressed data created from the same determination waveform data.

FIG. 16 is a diagram showing recompressed data created from the same determination waveform data.

FIG. 17 is a diagram showing an example in which it is substantially possible to create recompressed data of a determination waveform displayed on the screen of the display device.

FIG. 18 is a diagram illustrating a pixel matrix on a screen of a display device that displays determination waveform data stored in a V-RAM.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Operation part 12 ... Microcomputer 14 ... Input / output part 16 ... Display device 18 ... V-RAM 20 ... C
PU 22 ROM 24 RAM 30 Uncompressed size calculating means 32 Compressed data creating means 34 Uncompressed / compressed size comparing means 36 Identified waveform data deciding means 38 Recomposability deciding means 40 Re Compressed data creation means 42 ... Recompressed data holding means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-245762 (JP, A) JP-A-4-1155671 (JP, A) JP-A-4-126466 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04N 1/41-1/419 G01D 21/00 G09G 5/36

Claims (1)

(57) [Claims] 1. The color of a pixel is sequentially examined in a row direction for each column of a pixel matrix on a display screen for displaying judgment waveform data stored in a V-RAM, and the number of times the color has changed and the color change. And a compressed data generating means for generating compressed data from the waveform data for all columns, and determining whether the number of color changes examined for each column is 2 or less for all columns. Means for judging the possibility of recompression, and data indicating the number of pixels until the color obtained for each column changes when it is judged that the number is 2 or less for all columns. A recompressed data generating means for generating recompressed data from the compressed data for all columns for at most two times from the beginning; and a recompressed data holding means for holding the recompressed data. Characteristic judgment waveform Shrinkage data created holding device.