JPH036752U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a data reading device according to an embodiment of this invention, FIG. 2 is a diagram illustrating an encoded image of a mesh pattern that is the object of reading in the embodiment, and FIG.
The figure is a flowchart of scanning/decoding processing according to the embodiment, Figure 4 is a diagram showing an example of scanning of an encoded image by an image sensor, Figure 5 is a diagram showing an enlarged example of scanning, and Figure 6 is a diagram showing the first example of scanning. Flowchart of decoding process according to a modified example, Figure 7 is image RA
A diagram showing an outline of the image data on M and used to explain the measurement of the length of the net pattern seen from the main scanning direction, FIG. 8 is a diagram showing a histogram of run lengths related to the main scanning line image, and FIG. 9 10 is a diagram used to explain the measurement of the vertical length of a net-like pattern by rotational search, and FIG. Figure 11 is a diagram used to explain the detection of mesh pattern boundaries by parallel search, and Figure 12 is a diagram used to explain boundary determination between mesh rows by maximum mismatch detection of image bit patterns. , 13th
The figure relates to the second modification and is used to explain the detection of the outline of the mesh pattern on the image RAM, FIG. 14 is a flowchart of the decoding process of the second modification, and FIG. Regarding the third modification,
A diagram illustrating the principle of detecting the corner position of a mesh pattern on the image RAM by a two-minute search. FIG. 16 relates to the fourth modification, and is an image in which an encoded image with alignment marks added to the mesh pattern is captured. FIG. 17, which shows the RAM, is a diagram showing the principle of measuring the position of the alignment mark. 10...Data reading device, 11...Image sensor, 14...Recording medium, 15...CPU, 16...RO
M, 20...Encoded image, 21...Mesh pattern.

Claims (1)

[Claims for Utility Model Registration] From a recording medium on which an image of a mesh pattern in which data is encoded by brightness and darkness selectively formed in each mesh is recorded, the above image can be obtained without substantially impairing distance accuracy. image sensor means for reading the represented image data; mesh position determining means for collectively determining the position of pixel data representing each mesh in the image data based on the overall geometric regularity of the image data; A data reading device comprising: mesh brightness/darkness discriminating means for identifying the brightness or darkness of each of the meshes based on pixel data at each determined position.