JP2005295313A5

JP2005295313A5 -

Info

Publication number: JP2005295313A5
Application number: JP2004109058A
Authority: JP
Filing date: 2004-04-01
Publication date: 2006-10-19

Claims

Imaging means for imaging a subject;
Exposure control means for adjusting parameters related to exposure of the imaging means according to the brightness of the photometric area of the image captured from the imaging means;
A code reading device comprising graphic code decoding means for decoding a graphic code included in an image captured by the imaging means using the adjusted parameter,
The code reader according to claim 1, wherein the exposure control unit adjusts a parameter related to exposure of the imaging unit by using an initial area for initial photometry as the photometry area.

Imaging means for imaging a subject;
Exposure control means for adjusting parameters related to exposure of the imaging means according to the brightness of the photometric area of the image captured from the imaging means;
A code reading device comprising graphic code decoding means for decoding a graphic code included in an image captured by the imaging means using the adjusted parameter,
The exposure control means adjusts to a parameter for capturing an image of brightness suitable for decoding the graphic code by changing the photometric area from an initial area for initial photometry as the photometric area. Code reader.

Imaging means for imaging a subject;
Exposure control means for adjusting parameters related to exposure of the imaging means according to the brightness of the photometric area of the image captured from the imaging means;
A code reading device comprising graphic code decoding means for decoding a graphic code included in an image captured by the imaging means using the adjusted parameter,
The exposure control means sets an initial area for initial photometry as the photometry area, adjusts a parameter related to exposure of the imaging means based on the brightness of the initial area,
Set an area of n (n is a natural number starting from 1) for photometry with the size of the initial area changed, determine the brightness of the n-th area,
When it is determined that the n-th area can be adopted as a photometric area according to the brightness determination result, a parameter related to the exposure of the imaging unit is adjusted based on the brightness of the n-th area, Set the n + 1 area for photometry with the size of the nth area changed, determine the brightness of the n + 1 area,
When it is determined that the n-th area cannot be used as a photometric area, a code reading device is provided that repeats control without setting the n + 1-th area for photometry in which the size of the n-th area is changed .

The exposure control means does not set the (n + 1) area for photometry in which the size of the n-th area is changed even when it is determined that the n-th area can be adopted as the photometry area. The code reader according to claim 3 .

Adjustment of parameters relating to exposure of the imaging means, according to skip the adjustment or the adjustment of the adjustment amount 0 any one of claims 1 to 4, characterized in that it comprises not perform the adjustment Code reader.

The photometry area code according to any one of claims 1 to 4, characterized in that an area for detecting the brightness of the captured image reading apparatus.

The graphic code, the code reading device according to any one of claims 1 to 6, characterized in that a 2-dimensional code.

The graphic code, the code reading device according to any one of claims 1 to 7, characterized in that a QR code.

The parameter code reading apparatus according to any one of claims 1 to 8 characterized in that it is a parameter that affects the brightness of the image.

The parameters, shutter speed, exposure time, gain, or code reading apparatus according to any one of claims 1 to 9, characterized in that a parameter of the aperture.

The initial area code reading apparatus according to any one of claims 1 to 3, characterized in that located in the center direction of the captured image.

4. The code reader according to claim 3, wherein the change of the area size is an enlargement of the area size.

In electronic devices that can read 2D code symbols,
An electronic apparatus comprising the code reading device according to any one of claims 1 to 12 .

In a parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of a photometric area of an image captured from the imaging unit,
Setting an initial area for initial metering as the metering area;
Adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area;
Setting an area of n (n is a natural number starting from 1) for photometry in which the size of the initial area is changed;
evaluating the brightness index of the nth area;
Determining whether to adopt the n-th area as a photometric area according to the evaluation result;
In the case of adopting the n-th area, a step of adjusting a parameter related to the exposure of the image pickup means based on the brightness of the n-th area, or an empty step meaning that this step is skipped ,
And a step of setting the (n + 1) th area for photometry in which the size of the nth area is changed.

In a parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of a photometric area of an image captured from the imaging unit,
Setting an initial area for initial metering as the metering area;
Adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area;
Setting an area of n (n is a natural number starting from 1) for photometry, which is an extension of the initial area;
Extracting m (m is an arbitrary natural number) areas included in the n-th area, and evaluating a brightness index of an arbitrary A area among the m areas, Comparing the brightness indicator of the initial area with the brightness indicator of the area A;
When the difference in the brightness index is greater than or equal to a predetermined amount by the comparison, the A area is not adopted as an area for detecting brightness, and the A area for each of the areas excluding the A area included in the m areas. Performing the same evaluation as
Adopting the n-th area as a region for detecting brightness in the image when the determination is not made in all the regions included in the m regions. Parameter adjustment method.

In a parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of a photometric area of an image captured from the imaging unit,
Setting an initial area for initial metering as the metering area;
Adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area;
Setting an area of n (n is a natural number starting from 1) for photometry, which is an extension of the initial area;
Extracting m (m is an arbitrary natural number) areas included in the n-th area, and evaluating a brightness index of an arbitrary A area among the m areas, Comparing the brightness indicator of the initial area with the brightness indicator of the area A;
When the difference in brightness index is greater than or equal to a predetermined amount by the comparison, the area A is not adopted as an area for detecting brightness, and the area A is included in each of the areas other than the area A included in the m areas. Performing the same evaluation as the area;
Adopting, as the evaluated n-th area, an area in which the brightness in the image is detected is determined by removing an area from the n-th area that is determined not to be used among the m areas. A parameter adjustment method comprising:

Said initial area, a method of adjusting parameters of any one of claims 14 to 16, characterized in that the central direction of the area of the captured image.

The initial area is a rectangular area located towards the middle of the captured image, the area of the n-numbered, any one of claims 14 to 17, characterized in that the rectangle surrounding the initial area The adjustment method of the parameter as described in.

The m regions included in the area of the n-th, the adjustment parameter according to claim 15, 16 or 18, characterized in that the four regions of upper, lower, left and right in the vicinity of the side surface of the rectangular said initial area Method.

In the parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of the photometric area of the image captured from the imaging unit, a step of setting an initial area for initial photometry as the photometric area; Adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area, setting an n-th area for photometry in which the size of the initial area is changed, and an n-th area A step of evaluating the brightness index, a step of determining whether or not the n-th area is adopted as a photometric area according to the evaluation result, and a case where the n-th area is adopted, A step of adjusting a parameter related to the exposure of the imaging means based on the brightness of the area, or a sky meaning that this step is skipped Steps and a program for the steps, to be executed repeatedly finite times on a computer to set the n + 1 th area for photometry changing the size of the area of the n-th.

In the parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of the photometric area of the image captured from the imaging unit, a step of setting an initial area for initial photometry as the photometric area; Included in the nth area is a step of adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area, a step of setting an nth area for photometry by expanding the initial area, and Extracting the m areas, and evaluating a brightness index of an arbitrary area A among the m areas, the brightness index of the initial area and the brightness of the A area When the difference between the brightness index is a predetermined amount or more by the comparison, the area A is not adopted as a brightness detection area, For each of the areas excluding the A area included in the m areas, a step of performing the same evaluation as that of the A area, and when it is not determined that the adoption is not performed in all the areas included in the m areas, A program for causing a computer to execute a step of adopting an n-th area as an area for detecting brightness in the image.

In the parameter adjustment method for adjusting a parameter related to exposure of the imaging unit according to the brightness of the photometric area of the image captured from the imaging unit, a step of setting an initial area for initial photometry as the photometric area; Included in the nth area is a step of adjusting a parameter related to exposure of the imaging means based on the brightness of the initial area, a step of setting an nth area for photometry by expanding the initial area, and Extracting the m areas, and evaluating a brightness index of an arbitrary area A among the m areas, the brightness index of the initial area and the brightness of the A area When the difference between the brightness index is a predetermined amount or more by the comparison, the area A is not adopted as a brightness detection area, A step of performing the same evaluation as that of the A region for each of the regions excluding the A region included in the m regions, and a region in which the determination is not made among the m regions from the nth area. A program for causing a computer to execute a step of adopting the excluded area as an area for detecting brightness in the image as an evaluated n-th area.