Systems and methods for processing images

A computer-implemented method of aligning a first image with a second image, the method comprising:

• accessing the first image;
• accessing the second image comprising known landmarks;
• determining pixel coordinates of landmarks of the first image;
• determining a transformation based on the determined pixel coordinates of the landmarks of the first image and known landmarks of the second image, the transformation allowing mapping of the first image onto the second image;
• calculating a covariance of pixel values of the first image aligned and superimposed to the second image;
• and
• determining, based on the covariance of the pixel values, whether the first image is to be associated with the second image.

A system for identifying landmarks of a document from a digital representation of the document, the system comprising:

• at least one processor, and
• memory storing a plurality of executable instructions which, when executed by the at least one processor, cause the system to:
• access the digital representation of the document, the digital representation being associated with a first resolution;
• operate a Machine Learning Algorithm (MLA), the MLA having been trained:
• based on a set of training digital representations of documents associated with labels, the labels identifying landmarks of the documents represented by the training digital representations;
• to learn a first function allowing detection of landmarks of documents represented by digital representations;
• to learn a second function allowing generation of fractional pixel coordinates for the landmarks detected by the first function;
• the operating the MLA comprising:
• down-sampling the digital representation of the document, the down-sampled digital representation of the document being associated with a second resolution, the second resolution being lower than the first resolution;
• detecting landmarks from the down sampled digital representation of the document;
• generating fractional pixel coordinates for the detected landmarks in accordance with the second resolution, the fractional pixel coordinates allowing reconstructing pixel coordinates in accordance with the first resolution;
• determine the pixel coordinates of the landmarks by upscaling the fractional pixel coordinates from the second resolution to the first resolution;
• and
• output the pixel coordinates of the landmarks.