Character Inspection/OCR

字符检查/OCR

字符检查是检查、识别或确定打印在零件或产品上的字符的检查。该技术也称为打印检查，用于各种任务，例如：欧宝官网开户

读取压印在金属零件上的二维码
零件号或型号的字符检查
Checking expiration dates on food containers

零件和产品标有有效期欧宝官网开户或产品编号。然而，当这些信息不能被准确地读取、识别、判断、存储和管理时，这是没有用的。近年来，基于从捕获的图像数据中提取的字符进行识别或判断的字符检测已经变得非常普遍。本页介绍有关OCR（光学字符识别）和OCV（光学字符验证）的基本信息，以及字符检查的基本原理。

字符检查/OCR的基本原理，用于读取图像中的字符，例如过期日期

Advantages of introducing image processing

Character strings are indispensable for showing information such as expiration dates for food/medicine and part numbers of assembly parts in manufacturing. They are also essential for sales order management. These strings are vitally important for management; however, management of characters can be a lot of trouble.

例如，假设您以手写方式管理纸面订单和库存。笔迹管理可能会导致错误或遗漏。如果这本书丢失了，可能就无法取回订单和库存。

除了防止人为错误，图像处理越来越多地被用于使管理更加可靠，并减少劳动力和成本。用图像处理系统取代人手对字符的识别、检查和管理，具有以下优点：

Preventing mistakes and omissions in books

在字符检查中，将捕获的字符与注册字典（字符字体组）中的字符进行比较，并将每个字符识别为形状最接近的字符。将识别的字符与判断字符串进行比较，并生成最终检查的通过/失败输出。还可以将输出判断结果存储在服务器或其他存储设备上。这种可靠的程序可以防止管理人员通过手写可能出现的错误或遗漏。

可靠的信息管理

Character inspection using image processing technology allows operators to upload the recognized character information to a server or other device, so there are no worries about mistakes such as writing the wrong characters. Product numbers or other items that consist of many characters are often written incorrectly. Handling them as digital information can prevent problems.

Thorough management of product numbers and other information also allows tracking of parts or products and collecting them quickly in case of the outflow of defective products or a product recall. It is also possible to track problems upstream to identify a problematic process to improve operations. Reliable information management is also effective for ensuring traceability.

与条形码或二维码同时读取

In recent years, barcodes or 2D codes have been introduced for product management. To read barcodes or 2D codes only, you can use a barcode reader or a handheld mobile computer. In many cases, however, an expiration date is also marked on the label along with the barcode or 2D code. Character inspection can recognize both codes and characters simultaneously. This improves efficiency dramatically because you can read all data at once and manage them together instead of reading each type of data separately.

用最少的劳动力进行100%检查

为防止outfl最有效的方法ow of defective workpieces is 100% inspection. However, checking characters visually not only takes time and labor but also involves a risk of oversight. Using image processing enables reliable inline character inspection to achieve both quality assurance and reduced labor costs. It also improves the yield rate in the inspection process and is highly effective for increasing production efficiency.

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字符检查的基础知识

有各种类型的字符检查：标记存在、标记质量、光学字符验证（OCV）和光学字符识别（OCR）。

标记的存在

An inspection to detect the presence or absence of marking.
标记质量

检测难以辨认的字符的检查。
OCV

An inspection to compare marked characters and a judgment string and make pass/fail judgment.
光学字符识别

读取标记字符并输出以供验证或控制的检查。

Although the purposes are different, the basic operation of character inspection is to extract characters one by one from a captured image, compare them with characters in the registered dictionary, and identify characters.

1.字符提取

Extract characters one by one from the captured data.

2.与字典的比较

将提取的每个字符与注册字符进行比较以进行识别。

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Techniques for improving recognition accuracy

过去，有人抱怨字符识别的准确性低。通过各种技术创新，字符识别的准确性得到了显著提高。

子模式注册

为一个字符注册多个模式可以提高识别稳定性。通过将各种字体注册为子模式，可以防止由于不同字体类型而导致识别失败。

Automatic fitting

Automatic fitting is an automatic fine adjustment of characters to allow extraction in optimum conditions. Since slight variations in the status among characters are corrected individually before verification, the correlation level is increased.

图像增强滤波器

When the background of the marking has patterns or is made of metal or other reflective material, the accuracy of character inspection may decrease. Even when reading is difficult due to these or other reasons, applying image enhance filters enables stable character inspection.