US 12,449,671 B2
Portable speckle imaging system and method for automated speckle activity map based dynamic speckle analysis
Renju Parappillil Baby, Bangalore (IN); Parama Pal, Bangalore (IN); and Beena Rai, Pune (IN)
Assigned to TATA CONSULTANCY SERVICES LIMITED, Mumbai (IN)
Filed by Tata Consultancy Services Limited, Mumbai (IN)
Filed on Sep. 26, 2022, as Appl. No. 17/952,715.
Claims priority of application No. 202121047946 (IN), filed on Oct. 21, 2021.
Prior Publication US 2023/0130329 A1, Apr. 27, 2023
Int. Cl. G02B 27/48 (2006.01); G01N 21/47 (2006.01); G06T 5/50 (2006.01)
CPC G02B 27/48 (2013.01) [G01N 21/4788 (2013.01); G06T 5/50 (2013.01); G01N 2021/479 (2013.01); G06T 2207/30104 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A portable laser speckle imaging system, comprising:
a power source;
a first light source with a holder support positioned to emit a beam towards a target object;
an image capturing device positioned to receive illumination scattered from the target object;
a second light source positioned in line with the image capturing device to enable white illumination on the target object;
an attenuator to control intensity of the beam emitted by the first light source;
a beam expander positioned between the first light source and the attenuator to control size of the beam emitted by the first light source;
a polarizer lens positioned between the attenuator and the target object to polarize the beam emitted by the first light source; and
a controller unit operably connected to the first light source, the image capturing device, and the second light source, wherein the controller unit comprises:
one or more data storage devices configured to store instructions;
one or more communication interfaces; and
one or more hardware processors operatively coupled to the one or more data storage devices via the one or more communication interfaces, wherein the one or more hardware processors are configured by the instructions to:
acquire, a plurality of first type of images and a second type of image of the target object from the image capturing device, wherein the plurality of first type of images are acquired when the target object is illuminated by the first light source and the second type of image is acquired when the target object is illuminated by the second light source;
perform, one or more masking operations on the second type of image to obtain a masked image;
obtain, by performing an automated speckle activity map based dynamic speckle analysis technique on the plurality of first type of images, a third type of image, wherein obtaining the third type of image by performing the automated speckle activity map based dynamic speckle analysis comprises:
determining absolute difference between consecutive images in the plurality of first type of images to obtain a plurality of difference images;
assigning, a value to each pixel of each of the plurality of difference images based on a comparison with a first threshold;
adding the plurality of difference images having a value assigned to each pixel to obtain a resultant image; and
obtaining, based on a comparison of each pixel of the resultant image with a second threshold, the third type of image; and
determine a target image by multiplying the third type of image with the masked image, wherein an area indicative of a level of one or more activities occurring within the target object is detected from the target image.