Pattern recognition apparatus, pattern recogntion method, image processing apparatus, and image processing method

• US 8,620,094 B2
• Filed: 12/14/2012
• Issued: 12/31/2013
• Est. Priority Date: 06/11/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Takenouchi, Mariko, Takakura, Saki
• Primary Examiner(s): Johns, Andrew W
• Application Number:
  US13/715,166
• Publication Number:
  US 20130129219A1
• Time in Patent Office: 382 Days
• Field of Search: 382/104, 382/105, 382/209, 382/217, 382/218, 382/309
• US Class Current: 382/218
• CPC Class Codes: G06T 2207/30236 Traffic on road, railway or crossing
• CPC Class Codes: G06T 7/248 involving reference images or patches
• CPC Class Codes: G06V 20/00 Scenes; Scene-specific elements control of digital cameras H04N23/60
• CPC Class Codes: G06V 20/625 License plates
• CPC Class Codes: G06V 30/224 of printed characters having additional code marks or containing code marks
• CPC Class Codes: G08G 1/017 identifying vehicles G08G1/015, G08G1/054 take precedence

Abstract

An image and supplementary information of the image, such as a photographing point and time, are input by an image input section and are stored in an image data storage section. Character recognition in the image is performed by a character recognition section, and the recognition result is stored in a character recognition result storage section. An analysis section extracts object character information relevant to an object from the image, the supplementary information, and the character recognition result on the basis of the analysis conditions input in a designation section to thereby analyze an object, and the analysis result is output to a result output section. Accordingly, a change in the object can be analyzed by analyzing a change in character patterns indicating the identical object.

Claims

1. An image processing apparatus comprising:

an image input means for continuously inputting an image;

an image temporary storage means for temporarily storing the image input in the image input means;

a character extraction means for extracting a character from the image stored in the image temporary storage means;

a character recognition means for recognizing the character extracted in the character extraction means to thereby obtain as a recognition result one or more of candidate characters for the recognized character and each evaluation value;

a recognition result storage means for storing the recognition result obtained in the character recognition means; and

a recognition result evaluation means for determining whether to output the image which is stored in the image temporary storage means, on the basis of the recognition result stored in the recognition result storage means

the recognition result evaluation means checks the recognition results of the characters of a plurality of images stored in the image temporary storage means and selects the image with the best evaluation value for the recognition result when an identical character string is included in the recognition results of the plurality of images.

2. The image processing apparatus according to claim 1,

further comprising an image output control means for outputting the image determined to be output in the recognition result evaluation means;

wherein the recognition result evaluation means checks the recognition results of the characters of the plurality of images stored in the image temporary storage means, and when the evaluation values are bad for recognition results of all characters even though characters are included in one image, notifies a corresponding effect to the image output control means, and

the image output control means outputs the image notified from the recognition result evaluation means together with supplementary information of the image and the recognition result.

3. The image processing apparatus according to claim 2 further comprising

a multi-camera recognition result cooperation means for storing a recognition result of characters in an image and supplementary information of the image used to obtain the recognition result, which are an output of another image processing apparatus connected through a network,

wherein the image input means inputting a supplementary information related to the image with the image,

the recognition result storage means storing the supplementary information related to the image with the image,

the recognition result evaluation means checks the recognition result stored in the recognition result storage means and the recognition result stored in the multi-camera recognition result cooperation means, and notifies the image output control means that the image is not output when the identical character string is included in both the recognition results and the supplementary information of the image and the evaluation values of the recognition results satisfy predetermined conditions;

and notifies the image output control means that the image is output when a character string included in the recognition result stored in the recognition result storage means is not included in the recognition result stored in the multi-camera recognition result cooperation means or when the supplementary information of the image and the evaluation values of the recognition results do not satisfy the predetermined conditions even if a character string included in the recognition result stored in the recognition result storage means is included in the recognition result stored in the multi-camera recognition result cooperation means, and

the image output control means outputs the image, the supplementary information of the image, and the recognition result to the network when it is notified from the recognition result evaluation means that the image is output.

4. An image processing method comprising:

an image input process of continuously inputting an image;

an image temporary storage process of temporarily storing the image input in the image input process;

a character extraction process of extracting a character from the image stored in the image temporary storage process;

a character recognition process of recognizing the character extracted in the character extraction process to thereby obtain as a recognition result one or more of candidate characters for the recognized character and each evaluation value;

a recognition result storage process of storing the recognition result obtained in the character recognition process; and

a recognition result evaluation process of determining whether to output the image, which is stored in the image temporary storage process, on the basis of the recognition result stored in the recognition result storage process;

in the recognition result evaluation process, the recognition results of the characters of a plurality of images stored in the image temporary storage process are checked and the image with the best evaluation value for the recognition result is selected when an identical character string is included in the recognition results of the plurality of images.

5. A non-transitory storage medium for recording an image processing program causing a computer to execute:

an image input step of continuously inputting an image;

an image temporary storage step of temporarily storing the image input in the image input step;

a character extraction step of extracting a character from the image stored in the image temporary storage step;

a character recognition step of recognizing the character extracted in the character extraction step to thereby obtain as a recognition result one or more of candidate characters for the recognized character and each evaluation value;

a recognition result storage step of storing the recognition result obtained in the character recognition step; and

a recognition result evaluation step of determining whether to output the image, which is stored in the image temporary storage step, on the basis of the recognition result stored in the recognition result storage step;

in the recognition result evaluation step, the recognition results of the characters of a plurality of images stored in the image temporary storage step are checked and the image with the best evaluation value for the recognition result is selected when an identical character string is included in the recognition results of the plurality of images.