The goal of this paper is to calculate the position of the patches of the GretagMacbeth color checker chart (now X-Rite color chart) using an image recorded by the Blackmagic Production Camera and compare it to reference data sets based on those provided by the manufacturer and measured spectral data under the same lighting conditions. A critical aspect in the production workflow is that all the imagery from the different sources can be combined easily in editing and compositing without additional color correction. Also it is often desirable to have some less expensive camera at hand which can be moved around easily to take textures and imagery for example to create clean plates. If for example an action scene is filmed using an ARRI film camera to capture the performance of the principal actors, additional imagery is derived using action cameras like the GoproHero. Maintaining a linear relationship to the light of the scene enables compositing artists and editors to combine imagery of varying sources (mostly cameras of different vendors). But they also are adding functions to establish a certain look, the camera company is associated with. Unfortunately most of the camera vendors are applying certain functions during the input step to the recorded RAW material, mostly to meet the needs of the display devices at the end of the pipeline. This means that the plate recorded by the camera is not permitted to be subject of changes in any way (,do no harm to the. Above all in a Visual Effects Pipeline (VFX) it is necessary to maintain a linear relationship of the pixel color in the recorded image to the original light of the scene throughout every step in the production pipeline. Read moreĬolor is an important aspect of the camera quality. Some experimental results as a coaxial inner profile measurement. Property of electric current of the variable focus lens. As this result, the radiusĭistribution of the inner surface profile can be determined from the The function of the electric current value. Is to say, the intensity distribution is described a Gaussian profile in The magnitudes of the intensityĭistribution are changed along focused positions of the ring beam. A CCD camera captures the ring as intensity distribution after Theīeam is formed like a ring on the inner surface of the cylindrical The focus position of the disk-like beam can beĬontrolled by electric current given to the. The shape of light beam is transformed from a point beam toĪ disk-like beam after passing through the variable focus lens and theĬonical mirror. The key device is a conical mirror and a variableįocus lens.
This paper demonstrated a uni-axial inner profile measurement based on
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