Digital camera sensitivity and exposure

1. Programmatic automatic exposure program AE is a combination of electronic technology and artificial intelligence. When exposed in this way, the camera can not only calculate the appropriate exposure according to the light conditions, but also automatically select the appropriate exposure combination.

2, the hyperfocal lens depth of view due to the lens is relatively large, people said after the focus of the clear imaging distance is the hyperfocal distance. A point-and-shoot camera generally uses a hyperfocal distance. After a certain distance, the short-focus lens can clearly image the features and save the focusing function. Therefore, a low-grade point-and-shoot camera cannot automatically focus, but only uses the hyperfocal distance. . As mentioned before, clarity is not an absolute concept. Scenes within the hyperfocal range are not truly clear images. Since they are not in focus, they are definitely vague, but the level of ambiguity is generally acceptable to people. This is what the shooter shoots. The reason why the film cannot be enlarged too much.

Interpolation (interpolation), sometimes referred to as "reset sample," is a method of increasing the pixel size of an image without generating pixels. The mathematical formula is used to calculate the color of missing pixels based on the surrounding pixel colors. . Some cameras use interpolation to artificially increase the resolution of the image.

4. The super-had image sensor has built-in ccd image sensor using super-hole accumulation diode (had) electronic image quality enhancement technology to improve the inductive performance of ccd and enhance digital signal processing functions, effectively reducing noise and reducing unnecessary The interference will make the picture clearer and brighter, and the color level will be more distinct. It will be particularly effective when there is not enough light in the scene or when shooting night scenes.

5, ttl light metering ttl light measuring. Through the lens to measure the amount of light, with the filter exposure, aperture focal length and other parameters have nothing to do. The metering methods are divided into average, local, and center-weighted metering. Any kind of metering method is very similar, but like the lighting method such as backlighting, the contrast between the light and darkness of the subject is extremely different, or different methods such as microphotography are different.

6, iso sensitivity value iso sensitivity value is the sensitivity of the traditional camera film response to light measurement, usually expressed in iso digital, the greater the number that the greater the sense of optical rotation, the commonly used expression method iso 100,400,1000, etc. In general, the higher the sensitivity, the thicker the film, the effect of amplification is poor, and the digital camera also applies the iso value to mark the exposure used by the metering system, the lower the reference iso, the required exposure The higher.