Code symbol reading apparatus and reading method

1. A code symbol reading apparatus comprising:

a decoder which decodes a code symbol attached to an article based on an image picked up by a camera, the image include the article;

an image display unit which displays a mirror image acquired by reversing the image picked up by the camera in a left-right direction, in a display area;

a candidate area detection unit which detects an image area to be a candidate of the code symbol from the image of the article picked up by the camera;

a direction determination unit which determines such a direction that a decoding rate of the code symbol becomes higher based on the image area detected by the candidate area detection unit when the decoder cannot decode the code symbol; and

a direction notification unit which notifies of the direction determined by the direction determination unit.

2. The apparatus of claim 1 , wherein the direction determination unit specifies such a direction that the image area detected by the candidate area detection unit becomes larger, as such the direction that the decoding rate of the code symbol becomes higher.

3. The apparatus of claim 1 , wherein the direction determination unit specifies such a direction that the image area detected by the candidate area detection unit becomes closer to the center of the image picked up by the camera, as such the direction that the decoding rate of the code symbol becomes higher.

4. The apparatus of claim 1 ,

wherein when the image area to be the candidate of the code symbol is detected by the candidate area detection unit, the image display unit identifies and displays this image area on the image picked up by the camera in the display area.

5. The apparatus of claim 4 , wherein the direction determination unit specifies such a direction that the image area identified and displayed in the display area becomes larger, as such the direction that the decoding rate of the code symbol becomes higher.

6. The apparatus of claim 4 , wherein the direction determination unit specifies such a direction that the image area identified and displayed in the display area becomes closer to the center of the image picked up by the camera, as such the direction that the decoding rate of the code symbol becomes higher.

7. The apparatus of claim 4 , wherein the direction notification unit displays a guide message notifying of the direction determined by the direction determination unit, in the display area.

8. The apparatus of claim 1 , wherein the direction determination unit specifies such a direction that the image area identified and displayed in the display area becomes closer to the center of the image picked up by the camera, as such the direction that the decoding rate of the code symbol becomes higher.

9. The apparatus of claim 1 , wherein when plural image areas are detected by the candidate area detection unit, the image display unit selects one of the image areas and identifies and displays the selected image area on the image picked up by the camera, and

the direction determination unit specifies such a direction that the image area selected from the plural image areas becomes larger, as such the direction that the decoding rate of the code symbol becomes higher.

10. The apparatus of claim 1 , wherein when plural image areas are detected by the candidate area detection unit, the image display unit selects one of the image areas and identifies and displays the selected image area on the image picked up by the camera, and

the direction determination unit specifies such a direction that the image area selected from the plural image areas becomes closer to the center of the image picked up by the camera, as such the direction that the decoding rate of the code symbol becomes higher.

11. A code symbol reading method comprising:

decoding, based on an image of an article picked up by a camera, a code symbol attached to the article;

displaying a mirror image acquired by reversing the image picked up by the camera in a left-right direction, in a display area;

detecting an image area to be a candidate of the code symbol from the image of the article picked up by the camera;

determining such a direction that a decoding rate of the code symbol becomes higher based on the image area detected by the candidate area detection unit when the decoder cannot decode the code symbol; and

notifying of the determined direction.