Device for reading resistor value with computer vision and method thereof

A method for reading resistor value with computer vision comprising:

• acquiring an image of a resistor to extract color bands;
• training the color bands for 4-band, 5-band and establishing colors of a body of the resistor in a control unit and storing different files of color classifier for each 4-band, 5-band, and resistor body color;
• in reading a resistor, extracting an image of the resistor to be read;
• converting the color image so extracted into a gray-scale image, executing binarization treatment, and executing noise removal;
• calculating a resistor disposition angle in the image, activating luminous elements at opposite axial ends of the disposition position of the resistor according to the angle for illumination, while luminous elements on opposite lateral sides of the resistor are deactivated in order to extract a color resistor image having no light reflection and low halo;
• adjusting the clear color resistor image such that the resistor in the image is set to the horizontal and separating a resistor body image;
• establishing a resistor body color image diagram having a size that is the same as that of the resistor body image and carrying colors;
• executing differencing between the resistor body image and the resistor body color image diagram and converting a result color image of differencing into a gray-scale image and executing binarization on the gray-scale image with a binarization process to generate a binarized image;
• and
• calculating coordinates of a centroid of each of the color bands of the resistor in the binarized image and extracting the color bands according to an x-axis coordinate of the centroid and a y-axis coordinate of a centroid of the resistor body image.