Image recognition

A computer program product comprising:

• one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to generate a first set of binary images from a first image based on a first color attribute value range associated with a textual object presented in the first image;
• program instructions to recognize a first set of candidates for the textual object from the first set of binary images;
• program instructions to determine a first appearance frequency of a first candidate in the first set of candidates;
• in response to determining that the first appearance frequency exceeds a first frequency threshold, program instructions to determine that the first candidate is a first recognition result for the textual object in the first image, wherein the first image is included in a video containing a plurality of images;
• determine a second color attribute value range within the first color attribute value range based on the first candidate;
• obtain a second set of candidates for the textual object in a second image of the plurality of images based on the second color attribute value range;
• determine a second appearance frequency of a second candidate in the second set of candidates;
• and
• in response to determining that the second appearance frequency exceeds a second frequency threshold, determine a second recognition result for the textual object in the second image based on the second candidate.

A computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
• program instructions to generate a first set of binary images from a first image based on a first color attribute value range associated with a textual object presented in the first image;
• program instructions to recognize a first set of candidates for the textual object from the first set of binary images;
• program instructions to determine a first appearance frequency of a first candidate in the first set of candidates;
• in response to determining that the first appearance frequency exceeds a first frequency threshold, program instructions to determine that the first candidate is a first recognition result for the textual object in the first image, wherein the first image is included in a video containing a plurality of images;
• determine a second color attribute value range within the first color attribute value range based on the first candidate;
• obtain a second set of candidates for the textual object in a second image of the plurality of images based on the second color attribute value range;
• determine a second appearance frequency of a second candidate in the second set of candidates;
• and
• in response to determining that the second appearance frequency exceeds a second frequency threshold, determine a second recognition result for the textual object in the second image based on the second candidate.