Image processing device, video photographing lens, video camera body and video camera equipment

Abstract

The invention discloses an image processing device, a video photographing lens, a video camera body and video camera equipment. The image processing device comprises a first chrominance signal filter and a bandpass filter. An image signal is successively transmitted to the first chrominance signal filter and the bandpass filter. The first chrominance signal filter is used for filtering the chrominance signal in the image signal. The bandpass filter outputs the image signal in which the chrominance signal is filtered, thereby realizing automatic focusing. Through the manner provided by the invention, the image processing device can quickly and accurately realize automatic focusing.

Description

technical field [0001] The invention relates to the field of camera technology, in particular to an image processing device, a camera lens, a camera body and camera equipment. Background technique [0002] Automatic focus is to use electronic technology and motor control technology to replace the human eye to detect whether the focus of the subject is clear, and to replace manual adjustment of the focus so that the subject is clearly imaged on the image sensor. Auto focus includes digital focus and analog focus. [0003] In the traditional analog focus method, the focus motor is made to go through the whole process to continuously acquire images, and the image is processed to obtain the voltage that reflects the image clarity. The clearer the image, the greater the voltage obtained. Carry out correlation calculations based on the obtained voltage to obtain the maximum sharpness, and then drive the focus motor to move according to the obtained maximum sharpness, so as to con...

AI Technical Summary

Problems solved by technology

However, in the above method, the band-pass filter usually cannot filter out the chrominance signal in the image signal well, especially the monochromatic chrominance signal, if the frequency of the monochromatic chrominance signal is not within the frequency range of the band-pass filter. In the center frequency range, it cannot be filtered out by the band-pass filter, so that in addition to the brightness signal, there are residual chrominance signals in the image signal obtained after passing the band-pass filter

Thus, affected by residual chrominance signals such as figure 1 As shown, the waveform of the obtained voltage that reflects the sharpness of the image will become less steep, that is, there may be multiple peaks a, b, and c in the voltage waveform, so the focus motor needs to complete a, b, c Point b is the highest point in the world only after the points corresponding to the three peaks, and even after comparing back and forth between the three peaks, it can be confirmed that point b is the highest point in the world, that is, the point with the clearest image, which will reduce the automatic focus speed

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