Image sensing apparatus and control method therefor
A technology of imaging equipment and pixels, which can be used in image communication, TV, color TV components and other directions, and can solve problems such as S/N ratio deterioration.
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no. 1 example
[0022] figure 1 is a block diagram showing the configuration of a digital camera as an example of the imaging apparatus according to the first embodiment of the present invention.
[0023] exist figure 1 In , reference numeral 101 denotes an imaging optical system including a lens and a mechanical shutter serving as a diaphragm, which forms an incident optical image of a subject on an image sensor 102 . The image sensor 102 converts the formed optical image of the subject into electrical signals through photoelectric conversion.
[0024] The analog signal processing unit 103 applies processing such as correlated double sampling to the output signal from the image sensor 102 and outputs an analog image signal. An analog / digital conversion unit (ADC unit) 104 converts the analog image signal output from the analog signal processing unit 103 into a digital image signal. The signal processing unit 105 applies image processing such as white balance adjustment, γ correction, an...
no. 2 example
[0069] Next, a second embodiment of the present invention will be described. In the first embodiment described above, the correction selection table based on the dark current estimated from the temperature, shutter speed, and sensitivity of the imaging device is used to select the normal based on the detected temperature, shutter speed, and sensitivity. Any one of readout, vertical line noise correction, and black removal processing.
[0070] However, the dark current generated in the image sensor 102 varies for each image sensor 102 . Therefore, in consideration of changes in dark current in the image sensor 102 when creating the correction selection table, it is necessary to start vertical line noise correction or start black removal processing early, thereby causing accelerated deterioration of image quality.
[0071] Thus, in the second embodiment, in order to eliminate the influence of variations in dark current in the image sensor 102, the dark current is actually measu...
no. 3 example
[0083] Next, a third embodiment according to the present invention will be described. In the above-described first and second embodiments, high-speed sweeping is not performed in the case of performing vertical line noise correction. However, if high-speed sweeping is not performed, smear will occur when shooting a high-brightness subject. Therefore, in the third embodiment, as Figure 9 As shown in the timing chart of , dummy field 1 for high-speed sweep is added before reading out the dummy image. Thus, after the exposure period of the image sensor 102 ends, unnecessary charges such as smear components and the like are eliminated by high-speed sweeping.
[0084] After that, transfer is performed in the vertical transfer CCD 102b during the period of virtual field 1 for high-speed sweep until moving to the next virtual field 2 in order to make the vertical line noise uniform at the upper and lower ends of the screen. This operation makes the vertical line noise in virtual ...
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