the leopard moth, zeuzera pyrina (l.) (lepidoptera: cossidae) is a serious pest of walnut and apple trees in iran. one of the control methods for this pest is the mass trapping of males using pheromone traps. to determine the best size and color of traps, four different colors (green, yellow, white, gray) and two different sizes (delta shape with standard adhesive surface, 19 × 22 cm and trapez...

The quality of 3D scanned data is influenced by many factors, such as scanned surface color, glossiness, geometry, ambient light, scanner resolution, proper selection of scanned segments, etc. Surface color and glossiness are important sources of errors, and this paper studies their effects on a specific commercial scanner. Preparatory phase of digitizing process includes selecting proper combi...

Color is an effective and commonly used channel for displaying data in surface visualization. However, color is affected by shadows and shading, which convey depth and shape on surfaces. The human visual system has evolved constancy mechanisms for identifying color under varying illumination conditions. Lightness constancy allows people to accurately perceive colors in real shadows; however, it...

We propose a technique to modify colors in photographic images predicting the color appearance of objects in an image under different illuminations. Using the dichromatic surface reflectance model, we estimate the illumination spectrum and the spectrum of the diffuse surface reflectance via the color histogram and subspace analyses. With this estimated spectral information, and the spectrum of ...

A fiber optic two-color pyrometer was developed for brake disc surface temperature measurement. The two-color pyrometer is composed of a fluoride glass fiber and two HgCdTe detectors equipped with bandwidth filters. The two-color pyrometer allows the measurement of brake disc temperature in the 200-800 °C range with a time resolution above 7 μs. Calibration formula for the signals obtained usin...

Color constancy is the perceived stability of the color of objects despite changes in the light illuminating them. An object's color is considered constant if the current perceived color is judged to be in accord with the remembered one. Thus the accuracy and precision of color memory are fundamental to understanding this classic problem. Two hypotheses of color memory are tested here: (1) the ...