在做人脸识别的时候，能够让电脑屏幕显示彩色的图像吗？

Mr.fu_付先生

在做人脸识别的时候，能够让电脑屏幕显示彩色的图像吗？？？

kidswong999

没意义啊，因为人脸识别的算法是黑白的

Mr.fu_付先生

@kidswong999 意思就是不能让电脑屏幕显示彩色的吗？？？因为老师想看看彩色的样子，并且想保存彩色的照片

kidswong999

那你直接在程序里把GRAYSCALE改成RGB565就完事了。

Mr.fu_付先生

@kidswong999 那还能进行人脸识别吗？？？？

kidswong999

你试试不就知道了，我刚才运行了一下没问题。

Mr.fu_付先生

@kidswong999 啊？？？我直接运行就卡死了？？？我们的不一样吗？？？能麻烦你把代码给我看一下吗？？？

kidswong999

# Face Detection Example
#
# This example shows off the built-in face detection feature of the OpenMV Cam.
#
# Face detection works by using the Haar Cascade feature detector on an image. A
# Haar Cascade is a series of simple area contrasts checks. For the built-in
# frontalface detector there are 25 stages of checks with each stage having
# hundreds of checks a piece. Haar Cascades run fast because later stages are
# only evaluated if previous stages pass. Additionally, your OpenMV Cam uses
# a data structure called the integral image to quickly execute each area
# contrast check in constant time (the reason for feature detection being
# grayscale only is because of the space requirment for the integral image).

import sensor, time, image

# Reset sensor
sensor.reset()

# Sensor settings
sensor.set_contrast(1)
sensor.set_gainceiling(16)
# HQVGA and GRAYSCALE are the best for face tracking.
sensor.set_framesize(sensor.HQVGA)
sensor.set_pixformat(sensor.RGB565)

# Load Haar Cascade
# By default this will use all stages, lower satges is faster but less accurate.
face_cascade = image.HaarCascade("frontalface", stages=25)
print(face_cascade)

# FPS clock
clock = time.clock()

while (True):
    clock.tick()

    # Capture snapshot
    img = sensor.snapshot()

    # Find objects.
    # Note: Lower scale factor scales-down the image more and detects smaller objects.
    # Higher threshold results in a higher detection rate, with more false positives.
    objects = img.find_features(face_cascade, threshold=0.75, scale_factor=1.25)

    # Draw objects
    for r in objects:
        img.draw_rectangle(r)

    # Print FPS.
    # Note: Actual FPS is higher, streaming the FB makes it slower.
    print(clock.fps())

Mr.fu_付先生

@kidswong999 谢谢了