Method and system for detecting and correcting orientation of document images

A system to detect and correct orientation of a document image, comprising:

• one or more processors;
• a memory communicatively coupled to the processors, wherein the memory stores a plurality of processor-executable instructions, which, upon execution, cause the processors to:
• detect a plurality of regions in the document image, each region comprising text data;
• determine positional information of each of the regions, wherein the positional information comprises x and y coordinates of a top left corner and width and height of each of the plurality of regions;
• for each of the plurality of regions:
• determine a region orientation to be one of:
• a first orientation if height of a region is greater than three times width of the region, wherein the first orientation is equal to 90 degrees, or
• a second orientation if the width of the region is greater than three times the height of the region, wherein the second orientation is equal to 180 degrees;
• determine a ratio of a number of regions determined as having the second orientation to a number of regions determined as having the first orientation;
• determine a page orientation of the document image as a third orientation or the second orientation if the ratio is greater than a pre-determined threshold or if the number of regions determined as having the first orientation is zero;
• wherein the third orientation is equal to 0 degree;
• and
• wherein the ratio is computed if the number of regions determined as having the first orientation is non-zero and if the number of regions determined as having the first orientation is zero, the page orientation is determined as the third orientation or the second orientation without computing the ratio;
• rotate the document image by 90 degrees in counter-clockwise direction if the ratio is less than the pre-determined threshold or if the number of regions determined as having the second orientation is zero;
• determine:
• a first OCR data by performing optical character recognition (OCR) of each of the regions of the document image, and
• a second OCR data by performing optical character recognition (OCR) of each of the regions of a rotated document image rotated by 180 degrees;
• determine a number of correct words in each of the first OCR data and the second OCR data based on a comparison with a dictionary data;
• determine the page orientation as the third orientation if the number of correct words in the first OCR data is greater than the number of correct words in the second OCR data;
• and
• rotate the document image by 180 degrees if the number of correct words in the first OCR data is less than the number of correct words in the second OCR data.

A non-transitory computer-readable medium storing computer-executable instructions for detecting orientation of a document image, the computer-executable instructions configured for:

• detecting a plurality of regions in the document image, each region comprising text data;
• determining positional information of each of the regions, wherein the positional information comprises x and y coordinates of a top left corner and width and height of each of the plurality of regions;
• for each of the plurality of regions:
• determining a region orientation to be one of:
• a first orientation if height of a region is greater than three times width of the region, wherein the first orientation is equal to 90 degrees, or
• a second orientation if the width of the region is greater than three times the height of the region, wherein the second orientation is equal to 180 degrees;
• determining a ratio of a number of regions determined as having the second orientation to a number of regions determined as having the first orientation;
• determining a page orientation of the document image as a third orientation or the second orientation if the ratio is greater than a pre-determined threshold or if the number of regions determined as having the first orientation is zero;
• wherein the third orientation is equal to 0 degree;
• and
• wherein the ratio is computed if the number of regions determined as having the first orientation is non-zero and if the number of regions determined as having the first orientation is zero, the page orientation is determined as the third orientation or the second orientation without computing the ratio;
• rotating the document image by 90 degrees in counter-clockwise direction if the ratio is less than the pre-determined threshold or if the number of regions determined as having the second orientation is zero;
• determining:
• a first OCR data by performing optical character recognition (OCR) of each of the regions of the document image, and
• a second OCR data by performing optical character recognition (OCR) of each of the regions of the document image rotated by 180 degrees;
• determining a number of correct words in each of the first OCR data and the second OCR data based on a comparison with a dictionary data;
• determining the page orientation as the third orientation if the number of correct words in the first OCR data is greater than the number of correct words in the second OCR data;
• and
• rotating the document image by 180 degrees if the number of correct words in the first OCR data is less than the number of correct words in the second OCR data.