October 2018 - Custom Web Development Blog

Archive - October 2018

ChartRecorder: Computer Vision for Gas Flow Charts

Flow charts are widely used in gas industry. They record parameters of a gas flow (like pressure) on a paper disc. This data is then used to calculate gas volume passed through a pipe.


The chart recorder contains two or three pens driven by sensors. These pens plot traces on a rotating paper disk. The disk performs one revolution per day or week, rarely per month. The disk is replaced after one revolution.

Currently disks are processed manually. The operator uses the vector graphics editor to convert the scanned bitmap to contours and then to tabular data. This approach relies heavily on the operator’s attention and experience. There is a high probability of mistakes. After all, such job is really boring!

We have developed an algorithm that performs this job automatically. Given a bitmap with a scanned chart, it produces tabular representation of chart data.
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Practical guide for making tests execution result reports more comprehensible

When REST API is tested, one has to take into account a number of low level details. This makes test execution reports verbose, difficult for reading and complicates the maintenance of the test scripts. For instance, the backend of an application consists of about 15 services and a separate service, that provides API for the mobile client. The minimal set of integration tests contains about 400 tests, which create more than 70000 rows of log files. To sort out such size of the text file, generated by only one run of the test is not feasible, even with joint effort of the entire QA department.

In this article we will examine how to make tests execution reports more comprehensive, using a specific tool – Allure, created by Yandex company. Yandex Allure is one of the solutions to the task for the design of the testing reports.
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