Illumination and image processing method as well as light source control device of meter character recognition system
A light source control and image processing technology, which is applied to lighting devices, character and pattern recognition, and components of lighting devices, etc., can solve the problem of bright spot phenomenon affecting the recognition effect, etc. Effect
Inactive Publication Date: 2010-09-15
CHINA JILIANG UNIV
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[0005] The purpose of the present invention is to provide a lighting and image processing method and a light source control device for an instrument character recognition system, so as to solve the problem that the bright spot phenomenon in the existing instrument character automatic recognition affects the recognition effect
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0029] Such as figure 1 As shown, the present invention includes camera 1, image acquisition card 2, computer 3, ring light source 6 and light source main circuit, is characterized in that: also includes and can change the angular displacement executive mechanism 5 of ring light source 6 and its drive circuit 4, angular displacement The actuator 5 is connected to the ring light source 6 .
[0030] Such as figure 2 As shown, the angular displacement actuator 5 is a stepper motor 5-1 with a drive circuit 4, one end of the bracket is fixed on the camera 1, and the other end of the bracket is fixed on the stepper motor 5-1, and the stepper motor A connecting block is installed on the 5-1 shaft, and the connecting block is connected with the side of the ring light source 6. When the stepping motor 5-1 rotates, multiple illumination directions of the ring ...
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The invention discloses an illumination and image processing method as well as a light source control device of a meter character recognition system. The light source control device comprises a camera, an image acquisition card, a computer, an annular light source, a light source main circuit, an angle displacement execution mechanism and a drive circuit, wherein the angle displacement execution mechanism can change the annular light source, and is connected with the annular light source. An image of a target to be recognized is acquired under the condition of different illumination, filtering and binary treatment are carried out on the image, a new image is synthesized according to the gray level information of the binary image, and the characters in the image are recognized by using the character recognition technology. The method has the advantages of simple structure and low cost, solves the problem that the bright speck phenomenon in automatic recognition of the conventional meter character influences the recognition effect, and improves the recognition efficiency of the meter character.
Description
technical field [0001] The invention relates to an illumination and image processing method and a light source control device of an instrument character recognition system. Background technique [0002] The automatic recognition of instrument characters is an application of machine vision technology, which is often used in automatic detection, automatic verification and other systems. Its hardware generally includes a light source, a camera, and a computer equipped with an image acquisition card. The image acquisition card and the computer are often replaced by an embedded system that implements the same function. The working process of automatic recognition is: before the system works, adjust the parameters such as light intensity and position of the light source, capture the image of the object to be recognized through the camera and image acquisition card during work, and then use the image processing and character recognition programs in the computer to identify the obje...
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Login to View More IPC IPC(8): G06K9/00G06K9/20F21V14/02
Inventor 富雅琼陈乐孙坚钟绍俊徐红伟
Owner CHINA JILIANG UNIV