Method and apparatus for direct image pick-up of granular speck pattern generated by reflecting light of laser beam

Abstract

A granular speck pattern is generated by a reflecting laser beam as an object to be measured is irradiated with a laser beam. This granular speck pattern is directly picked up as an image index by a line sensor. An A/D converter converts an analog signal supplied from the line sensor to a digital signal, and a processing unit calculates the amount of movement of the object on the basis of movement of a pixel interval of the granular speck pattern. A display device displays the amount of movement calculated by said processing unit.

1 . Apparatus for direct image pick-up of a particular granular speck pattern generated by reflecting light of a laser beam depending on a degree of roughness of the laser beam irradiated surface of an object to be inspected, said apparatus comprising: 
 a lensless video camera having a CCD element incorporated in said video camera; and    a shielding tube coupled to said camera for shielding extraneous light rays.    
   
   
       2 . Apparatus for direct image pick-up of a particular granular speck pattern generated by transmitted light of a laser beam diffusively reflecting depending on a degree of roughness of the laser beam irradiated surface of an object to be inspected or on shapes of fine ingredients constituting said object to be inspected, said apparatus comprising: 
 a commercially available video camera having a CCD image detector and deprived of its image forming lens; and    a shielding tube coupled to said camera to shield extraneous light rays from striking the CCD of said camera.    
   
   
       3 . Apparatus for direct image pick-up of a particular granular speck pattern comprising: 
 a laser for directing a laser beam onto the surface of an object to be inspected;    a digital camera having a CCD element incorporated in said camera; and    a shielding tube coupled to said camera for shielding extraneous light rays.    
   
   
       4 . Apparatus for direct image pick-up of a particular granular speck pattern generated by transmitted light of a laser beam diffusively reflecting depending on a degree of roughness of the laser beam irradiated surface of an object to be inspected or on shapes of fine ingredients constituting said object to be inspected, said apparatus comprising: 
 a lensless video camera having a CCD image detector for receiving light directly onto said CCD; and    a shielding tube coupled to said camera to shield extraneous light rays from striking the CCD of said camera.    
   
   
       5 . The apparatus of  claim 1 , further including: 
 an A/D converter coupled to said camera to convert an analog signal supplied from said camera to a digital signal;    a processing unit coupled to the A/D converter to calculate an amount of movement of said object on the basis of movement of the granular speck in said pattern with respect to a pixel interval of said granular speck pattern picked up by said camera and represented by said A/D converted signal; and    a display coupled to said processing unit to display the amount of movement calculated by said processing unit.    
   
   
       6 . The apparatus of  claim 2 , further including: 
 an electrical circuit coupled to said camera for calculating the amount of movement of said object on the basis of movement of the granular speck in said pattern with respect to a pixel interval of said granular speck pattern picked up by said camera and displaying the amount of movement calculated by said electrical circuit.    
   
   
       7 . The apparatus of  claim 3 , further including: 
 a processing unit coupled to said camera to calculate the amount of movement of the object on the basis of movement of a granular speck in said granular speck pattern with respect to a pixel interval of said granular speck pattern detected by said camera; and    a display coupled to said processing unit to display the amount of movement calculated by said processing unit.    
   
   
       8 . The apparatus of  claim 4 , further including: 
 an electrical circuit coupled to said camera for calculating the amount of movement of the object on the basis of movement of the granular speck in said pattern with respect to a pixel interval of said granular speck pattern picked up by said camera and displaying the amount of movement calculated by said electrical circuit.    
   
   
       9 . Apparatus for direct image pick-up of a particular granular speck pattern generated by reflecting light of a laser beam depending on a degree of roughness of the laser beam irradiated surface of an object to be inspected, said apparatus comprising: 
 a lensless camera; and    a shielding tube coupled to said camera for shielding extraneous light rays.