JPS61150079A - Area measuring method - Google Patents

Abstract

PURPOSE:To speed up a processing by specifying the address of a storage cell in a preset area where the tested subject of an optical RAM is image-formed, reading sequentially the output of the storage cell and counting the number of storage cells for exceeding a preset discriminating level. CONSTITUTION:Prior to measuring the area of a picture stored in the optical RAM34, a horizontal scan parameter is stored in a table memory 12 based on the data of a CPU, and an activating signal activates a pulse generator circuit 6. In correspondence to an output from an address counter 9 and the output of a decoder 13, four types of data Li, Di, Xi, and Yi, on the horizontal scan parameter from the table memory 12 are set to latch circuits 20 and 22 and counters 21 and 23, respectively. Afterward, a pulse generator circuit 7 is activated in accordance with a set completion signal from the decoder 13, and a drive circuit 35 scans the optical RAM34 at a high speed. On the basis of the horizontal scan parameter picture data in a measurement area70, which is read out of the optical RAM34, is given to an area counter 4, and the white point of the picture data is measured, thereby inputting the result to the CPU.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an area measuring method for extracting characteristic portions of an object from image data and performing judgment and discrimination.

BACKGROUND ART Conventionally, methods for measuring the area of an object to be detected on an image include a method in which a CPU (central processing unit) reads out image data in a predetermined measurement area from image data once stored in an image memory and measures the area; There has been a method in which a counter is operated to count the white points only when image data within a measurement area set in hardware is sent from a camera.

In the first prior art, the area measurement method 177 can be set relatively freely, but it takes time to process the image because it is counted individually after the image data is loaded into the memory. *
Since this method requires a separate image memory, there are problems in that the configuration is complicated and the cost is high. In addition, with the prior art of tJ&2, reading and counting of image data are performed simultaneously, so it is fast, but it is only possible to set measurement areas with relatively simple shapes, and image memory is no longer required, but it depends on the number of measurement areas. Therefore, a comparator for address discrimination and an area counter are required, which makes the configuration complicated.
Moreover, the cost is high.

Purpose The purpose of the present invention is to solve the above-mentioned technical problems, and to provide an image measurement system that can perform area measurement within a measurement area with a complex shape, thereby speeding up data processing. The purpose is to provide a method.

Embodiment FIG. 1 is a block diagram of an embodiment of the present invention.
The figure is a timing chart for explaining its operating state. A start signal from the CPU (central processing unit) is applied to the input terminal of the R37 lip 70 tube 2 via line 1 and to the input terminal of the area counter 4 via line 3. This start signal sets the RS7 lip 70 block 2 and clears the area counter 4. The output terminals of the R87 lip 70 tube 2 are connected to the first pulse generator/main circuit 6 and the @2 pulse generator circuit 7 via lines 5 and 5a, respectively. The first pulse generating circuit 6 derives the clock signal CK shown in FIG. 2 (2) to the line 8 when the RS 7 'J knob 70 knob 2 is set. Clock signal CK from first pulse generating circuit 6 is applied to address counter 91 from line 8 .

The address counter 9 increments by 1 for each scanning point in synchronization with the clock signal CK as shown in FIG. 2 (3), and the counter output is sent to 8 pits Table memory 1 with storage capacity of
2 and recorder 13, respectively. Table memory 12 stores horizontal scanning parameters based on data from the CPU via line 14, and stores horizontal scanning parameters in response to counter output from address counter 9, as shown in FIG.
The horizontal gold production parameters shown in 4) are derived on line 15. This horizontal scanning parameter consists of four sets of data Li, Di, Xi, Yi (i = 1-n), and an address is determined for each of these data Li = Yi. These four sets of data are stored in the table memory 12 at each address. Such data L i = Y i is from line 16 to
19 to a Y address latch circuit 20, an X address counter 21, a data latch circuit 22, and a horizontal line length counter 23, respectively. The Y address latch circuit 20 latches the Y address of the scanning start point shown in FIG. 2 (9) and outputs it to the line 26. The X address counter 21 is! @2 The scanning start point X address shown in Figure (8) is given, and the counter output is led out to line 27. The data latch circuit 22 detects the final horizontal line of the defined area and outputs the scan end signal shown in FIG. Further, the horizontal line counter 23 is given the length of each line in advance, detects the end of horizontal line scanning, and outputs a pollo signal B indicating the end of scanning to the line 29. The Y address latch circuit 20, the X address counter 21, the data latch circuit 22, and the horizontal line length counter 23 are connected to the decoder 13 via a common line 24.

The decoder 13 receives the lower two bits of the counter output from the address counter 9 [OtOIt[Otl]=[1
tO] t[1, 11, and table memory 12
The horizontal scanning parameters from Y address latch circuit 20
．． The X address counter 21 and the data latch circuit 22 serve to set the upstream horizontal line counter 23.

The output of decoder 13 is applied via line 30 to the input terminal of R87 lip 70 tube 31. The output terminal of this R87 lip 70 tube 31 is connected via line 32 to the second pulse generation circuit @7. The second pulse generation circuit 7 is activated after the horizontal scanning parameters are set in the Y address latch circuit 26, the X address counter 21, the data latch circuit 22, and the upstream horizontal line length counter 23, respectively. A drive circuit 35 for scanning an optical RAM (Random Access Memory) 34 at high speed with a clock signal CK shown in FIG.
It is also applied to the X address counter 21 and the horizontal line counter 23 via lines 36 and 37.

The drive circuit 35 performs high-speed scanning of the optical RAM 34 based on the row address signal RAS, column address signal CAS, and write signal WRT stored in the table memory 12 in advance to read image data. Image data from optic RAM 34 is input to area counter 4 via line 36. The area counter 4 also receives the write signal WRT from the drive circuit 35 on line 3.
7. The area counter 4 counts the white points (bright points) within the measurement area set by the scanning address from the optical RAM 34, and counts the white points (bright points) in the measurement area set by the scanning address from the optical RAM 34.
12) is sent to the CPU via line 38.
to use human power. The borrow signal B from the horizontal line count 23 is sent to the AN via the NOT date 42 from the line 39.
It is applied to one input terminal of the D date 43. The output from the decoder 13 is applied to the other input terminal of the AND date 43 via a line 44. AND date 43
The output from tA1 is provided to the tA1 pulse generation circuit 16 via line 45. The borrow signal B of the horizontal line counter 23 is also connected to the AND? signal via the line 40. -) 4
6 is applied to input terminal a. The input terminal of the AND date 46 is supplied with a write signal WRT from the drive circuit 35 via a line 47, and the input terminal C is supplied with a signal from the data latch circuit 22 indicating a flag indicating the end of the final horizontal line scan. is provided via line 28.

The end of scan signal shown in FIG. 2(13) from AND date 46 is provided to R37 lip 70 and CPU via lines 47 and 48, respectively. The borrow signal B from the horizontal line length counter 23 is also applied to the line 41
It is applied to the input terminal of R37 lip 70 tube 31 via.

To measure the area of the image stored in the optical RAM 34, first store the horizontal scanning parameters in the table memory 12 based on the data of the CPU, then set the R87 lip 70 knob 2 with a start signal and start the first pulse. Activate the generator circuit 6. In response to the output from the address counter 9 and the output from the decoder 13, four pieces of data Li, Di, Xi, and Yi of the horizontal scanning parameters are transferred from the table memory 12 to the Y address latch circuit 2.
0 and X address counter 21, data latch circuit 22, and horizontal line length counter 23, respectively.

Thereafter, the second pulse generation circuit 7 is activated in response to the set end signal from the decoder 13, and the drive circuit 35 outputs the row address designation signal RAS and the column address designation signal CAS.
and write signal WRT, optic RA
M34 is scanned at high speed. The scanning parameters from the table memory 12 are stored in the optical RA as shown in FIG.
The area measurement area 70 set on the image indicated by reference mark A of M34 is a horizontal line! ,~ノ,nl:J! +~J! The address of the starting point of each horizontal line segment when decomposed into ul (Xl, Y
I), (Xl, Y2), ..., (XllY2n), lengths of horizontal lines No. 1 to No. 20, , L2 and a scanning end flag (X 2111. The image data in the measurement area 7o read from the optical RAM 34 based on this horizontal scanning parameter is given to the area force holder 4, and the white point of the image data is measured. The result is input to the CPU, and thereby the area of the bright part of the image within the measurement area 70 can be measured.

In this way, by measuring the area on the image within the measurement area, data processing speeds up and it is also possible to set an area measurement area with a complex shape. Also, since image memory and numerous counters are no longer required,
Cost reduction is achieved. Furthermore, since only the data on the necessary measurement area is scanned at high speed, it is possible to realize a significant reduction in data processing time.

Effects As described above, according to the present invention, a store cell in an optical random access memory in a predetermined area where the object to be inspected is imaged is specified, and the outputs of the addressed store cells are sequentially output. By reading the data and counting the number of store cells that are above or below a predetermined discrimination level, data processing can be accelerated and area measurement on an image within a measurement area with a complex shape can be performed. It has extremely practical value.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a timing chart for explaining its operation, and FIG. 3 is a diagram for explaining addressing of the measurement area 70.

Claims (1)

[Claims] The device has a large number of store cells, an image of the object to be inspected is formed on the store cells, and the store cells derive an output having a level corresponding to the amount of received light. an optical random access memory for individually addressing and reading; means for addressing store cells in a predetermined area of the optical random access memory in which an object to be inspected is imaged; 1. A method for measuring an area, comprising means for sequentially reading outputs of addressed store cells and counting the number of store cells that are equal to or less than a predetermined discrimination level.