An automatic calibration bench to calibrate line scales up to three meters has been developed at the Centro Nacional de Metrología in Mexico. It incorporates an heterodyne laser interferometer to follow the position of a carriage that supports a microscope with a CCD camera. The images are processed using a novel robust algorithm to determine the center of each line. The carriage travels along guide ways and is commanded by a computer that controls the servomotor that moves it, allowing to complete the calibration automatically.The measurement and control software developed uses an image processing algorithm based on Gabor filters and robust statistics to discriminate between lines and unwanted features that may exist such as stain, scratches, rust, etc. It then calculates the absolute position of each line by coupling the reading of the carriage position given by the interferometer and the centerline position of the line in the image. Additionally, the software corrects the laser readings for ambient condition variations and controls the progress of the carriage.The mechanical design consists of a stiff bench with guide ways on which the carriage travels. Although the carriage travels in non-kinematic guide ways, the microscope and CCD camera sit on a plate that is kinematically supported. The movement is provided by a servomotor and transmitted by means of a screw.Uncertainty is expected to be between 3 and 10 µm which is common to other similar systems. The major advantage is the capability to calibrate automatically and discriminate defects on the scale.

In this work, an approach to the problem of impulsive noise removal in gray scale images is presented. We describe two models of adaptive mathematical morphology that improve the classical mathematical morphology in the removal of impulsive noise. The proposed method adjust the structuring elements to the local context of the image. The comparison with classical mathematical morphology denoising technique shows that the new approach better removes the salt and pepper noise, while preserves image details.

bbj.solarium.cs.buap.mx Resumen. En este trabajo se describe el diseño y construcción de un oxímetro de pulso con conexión WIFI. El dispositivo se conecta a un servidor que muestra la saturación de oxígeno y la frecuencia cardíaca. La información se visualiza en una aplicación web. El dispositivo se basa en el microcontrolador ESP8266 que establece la conexión inalámbrica y el envío de la información al servidor. En el artículo se describe el diseño del dispositivo y se muestran algunos resultados experimentales.

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