Optical detection device of detecting whether a target object has different surface treatment features and method of forming markers
An optical detection device of detecting whether a target object has different surface treatment features includes an image sensor and an operation processor. The image sensor is adapted to acquire a detection image containing the target object. The operation processor is electrically connected to the image sensor, and adapted to compute variation of an image shading parameter of the detection image so as to determine whether a boundary of the surface treatment features are detected by the image sensor in accordance with the variation of the image shading parameter.
1 . An optical detection device of detecting whether a target object has different surface treatment features, the optical detection device comprising:
an image sensor adapted to acquire a detection image containing the target object; and
an operation processor electrically connected to the image sensor, and adapted to compute variation of an image shading parameter of the detection image and further to determine whether a boundary of the surface treatment features are detected by the image sensor in accordance with the variation of the image shading parameter;
wherein the operation processor is adapted to further divide all pixels of the detection image into a first pixel group and a second pixel group in accordance with each pixel intensity of the foresaid all pixels, and compute a difference between first average intensity of the first pixel group and second average intensity of the second pixel group for being the image shading parameter;
wherein the operation processor is adapted to further compute an intensity mean value of the foresaid all pixels, and classify some pixels having the pixel intensity greater than or equal to the intensity mean value as the first pixel group, and classify other pixels having the pixel intensity smaller than the intensity mean value as the second pixel group.
2 . The optical detection device of claim 1 , wherein the image shading parameter is an image contrast value or a speckle size of the detection image.
3 . The optical detection device of claim 1 , wherein the operation processor computes the variation of the image shading parameter of the detection image when an auto exposure mode of the image sensor is actuated.
4 . The optical detection device of claim 1 , wherein the operation processor is adapted to further compare the image shading parameter with a predefined threshold, and determine the boundary is detected by the image sensor when the image shading parameter crosses the predefined threshold.
5 . The optical detection device of claim 4 , wherein the operation processor is adapted to further compute a period length of the image shading parameter crossing the predefined threshold, and utilize the period length to acquire a size of one of the surface treatment features.
6 . The optical detection device of claim 4 , wherein the operation processor is adapted to further compute a number of times that the image shading parameter crosses the predefined threshold, and utilize the number of times to acquire a number of the boundary detected by the image sensor.
7 . The optical detection device of claim 6 , wherein the operation processor is adapted to further compute a period length of the image shading parameter crossing the predefined threshold, and utilize the period length and the number of times to acquire barcodes or encode data represented by arrangement of the surface treatment features.
8 . The optical detection device of claim 1 , wherein the operation processor is adapted to further detect a structural feature formed on the target object for computing relative position change of the image sensor and the target object.
9 . The optical detection device of claim 8 , wherein the operation processor is adapted to further analyze and acquire an interval between plural boundaries of the surface treatment features, and utilize the interval to calibrate the relative position change.
10 . The optical detection device of claim 1 , wherein the operation processor is adapted to further compute a difference between a first pixel having maximum pixel intensity and a second pixel having minimum pixel intensity of the detection image for being the image shading parameter.
11 . The optical detection device of claim 1 , wherein the image sensor excludes an optical lens.
12 . The optical detection device of claim 1 , wherein the optical detection device further comprises a laser light source adapted to project an illumination beam onto the target object.
13 . The optical detection device of claim 12 , wherein a size of the surface treatment features is greater than or equal to an illumination range of the illumination beam projected onto the target object.
14 . The optical detection device of claim 1 , wherein the optical detection device is applied to detect whether the target object made by metal material has the different surface treatment features.